SFRVICE MANUAL AKAI TAPE RECORDER mone. 1 WITOWTABLE OF CONTENTS u m1 Vv vi vit vur x x SPECIFICATIONS MEASURING METHOD LOCATION CONTROLS ceeeee DISMANTLING OF TAPE TRANSPORT UNIT ‘& AMPLIFIERS ‘TRANSPORT MECHANISM MECHANISM ADJUSTMENT AMPLIFIER ADJUSTMENT MAINTENANCE PROCEDURES REPLACEMENT PARTS TABLE ‘TROUBLE SHOOTING CHART SCHEMATIC DIAGRAM u 12 4 30 41. SPECIFICATIONS STYLE wricut DIMENSIONS. POWER SUPPLY RECORDING. SYSTEM PLAY BACK. SYSTEM POWER ‘CONSUMPTION ‘TAPE SPEED ‘TAPE SPEED DEVIATION wow AND. FLUTTER FREQUENCY RESPONSE, SIGNAL TO NOISE RATIO. DISTORTION (Total Harmonies) (CROSS-TALK ERASE RATIO. INSULATION RESISTANCE INSULATION DURABILITY LIne OUTPUT MAIN OUTPUT DIN OUTPUT LINE INPUT MIC. INPUT, DIN INPUT FAST FORWARD, ‘AND REWIND, TIME ‘MONITOR ‘SYSTEM Portable 33 bs. (15 ky) 14H x 1341/2°Wx 14/2" (G608 x 345W x 1900 mm) AC 100 t0 240 V, $0/60 Hz Indine 4-track stereo, monaural recording Inne 4track stereo, monaural play back OVA, 3 speeds. 1-7/8", 3-3/4", 71/2" (15 with 15° Adaptor kin) Within + 3% at all tape speeds, [Less than 0.18 % RAMS. at 7-1/2" [Less than 0.25 % RMS. at 3.3/4" ess than 0.35 % RIMS. at 1-7/8" 40 to 15,000 Ha 3 4B at 7-1/2" 40 to 12,000 He + 3 a8 at 3.3/4" 40.0 6,000 Hz 3 4B at 1-7/8" Better than $0.48 Within 3 % at 1,000 Hz 0 VU recording Less than ~S5 4B (Monaural) Less than ~43 4B (Stereo) Less than —70 4B ‘More than 50 M ohms. 1,000 V. AC for more than one minute duration. 2.5.V at volume maximum (250 Hz OVO ‘corded tape used) Impedance; 82 K. ohms 4 W at music power per each channel, total 8W Impedance; 8 ohms 25 at Volume maximum Impedance; 82 K. ohms 150mv Impedance .. . 130 K. ohms 3av Impedance... 30K. ohms 2omv Impedance... 36 K. ohms 150 seconds for 1,200 ft, tape at 50 Hz 120 seconds for 1,200 ft. tape at 60 Hz + Can be monitored the program being recorded by using a stereo headphone, MOTOR HEADS REC/PLAY HEAD : ERASE HEAD RECORD LEVEL INDICATOR TRANSISTOR ‘USED ‘TUBE USED GERMANIUM USED REELS USED Condenser starting induction twospeed motor. Horse Power... . 1/100 HP Power Ratio 0% Revolution... 2,900 to 1,450 xp.m, at SO He 3/480 to 1,740 rpm. at 60 Hz Inline 4-track stereo/monaural Gap... .4/1000 mm Impedance... . 3,600 ohms a 1,000 Hz Inline 4-track stereo Gap... 0.1 mm Impedance .... 3,600 ohms at 90 K. Hz ‘Vertical indication model""A"" VU metor 280650x2 28C-4S8LG (CD) x2 WATIx1 GARSx2 CAA x1 INS4A x2 7,9", rell. MEASURING METHOD TAPE SPEED DEVIATION 1, Method involving use of pre-recorded tape Playback on the tape recorder to be tested tape pre- recorded at 1,000 Hz + 0.1% for measuring tape speed. deviation. Connect the appropriate output to a frequency counter ‘meter in order to measure the tape speed deviation from the resulting deviation of the measured frequency. 2. Method involving use of timing tape (designed for tape speed measurement) ‘This method utilizes a timing tape marked at intervals of 7.1/2". The running time of the tape over 60 marked section is measured in order to calculate the deviation of the tape speed. In applying this method, however, it should be born in mind that the timing tape stretch or contract, measurement error is inevitable, so that it is necessary to measure the total length of the tape in advanee. WOW AND FLUTTER Playback the 3,000 Hz pre-recorded tape whose wow and flutter level is guaranteed to be smaller than 0.07% for measurement by means of a wow meter. It is also possible for a 3,000 Hz sine wave to be recorded and played for measurement by means of the wow meter. In this case, however, the wow meter indicates a value as much as twice the value given in the spec the first page. SIGNAL TO NOISE RATIO Tie ee Line output F- Set the Equalizer Switch on “7-1/2 ips” position and playback a tape containing a 1,000 Hz sine wave record- fed at “0" VU level on a standard recorder. Connect a V.T.VM, to the line output jack of the recorder and measure its output. ‘Then remove the tape and measure the noise level under the same condition. values into decibles. WAY. Convert each of the measured TOTAL HARMONIC DISTORTION FACTOR 1K He Audio Distortion Oscillator ae meter Connect the measuring instrument as shown above, and record the 1,000 Hz sine wave at “0” VU. Playback the resultant signal and measure the overall distortion factor. Measure the noise level of the tape recorder with the tape removed; connect the audio oxillator directly to the distortion meter for measurement of the distortion factor of the oscillator. The required distortion factor may be obtained from ‘the results of the above measurement by the following formula. y= d-d,—ds where, dy Required d= Overall distortion factor dy = Noise level d,= Distortion factor of the oscillator (Note: New tape of particularly good quality should be used for measurment of the distortion factor. POWER OUTPUT Palyback a tape containing a sine wave of 1,000 Hz recorded at 0 VU on a standard recorder. Connect @ V.T.VM. to the line output jack of the re- corder and measure the voltage at the output of the recorder to be tested. @CROSS TALK (Cross talk between the tracks) Tape direction ‘As shown in the figure, first record a 1,000 Hz sine ‘wave on track No. 3 at 43 VU level. Next, remove the 1,000 Hz input signal and record under @ non-input condition. ‘Then, playback the tape on track No, 3 and No. 1 (reversed condition of tape) through the 1,000 Hz BP-F, (Band Pass Filter, Sensitivity ...1: 1) and obtain a ratio between the two from the following formula. C= 20 og _Fo__(ab) C = Desired cross talk ratio (db) Ep 1,000 Hz signal output level — E,= 1,000 Hz crosstalk output level E,= Nominput signal record level aa FREQUENCY RESPONSE Ba. F7OW vequency ine Line ={V.T.VM] Oscillator [Input Output Connect the measiring instrument as in the above dia- gram, and measure the frequency response in the follow- ing sequence: RECORD: 1) Give a sine wave of 1,000 Hz to the Line Input of the recorder to be tested through an attenuator from an audio frequency generator. 2) Set the Record/Playback Knob in “Rec” position and adjust the line input volume so that the VU ‘meter needle indicates “O"VU. 3) Under the condition described in (2), lower the input level 10 db by means ofthe attenuator. 4) Record the spot frequency in the range of 30 Hz to 25,000 Hz from the audio frequency generator. PLAYBACK: 5) Set the Record/Playback Knob in “Play” position. 6) Set the Equalizer Switch on 7-1/2" or 33/4" position. 7) Connect a V.T.V.M. to the Line output. 8) Playback the tape previously recorded. 9) Adjust the output level to “0” dbm at 1,000 Hz as indicated on the V.T.V.M. by the range selector of a VIVM, 10) Playback the recorded spot frequencies with the conditions in (9); make a memo of output level and plot the value on a graph.LOGATION OF CONTROLS Supply Ree Shaft {Cycle Conversion Switeh (A) Capstan CCapstan Storage Post Tape Guide raw Head ) Tape Cleaner Record/Playback Head Reset Button 19 Index Counter ab Track Selector @® Microphone Jack (Left) ED Microphone lack (Right) 1B Volume Control (Left) Tone Control Left) 1B Take-up Reel Shaft nase Lever 6B Speed Change Switch £8 Capstan Shalt &® Pinch Wheel a) Automatic Shutoff Lever B Fast Forward/Rewind Knob 22 Recont/Playback Knob ® Rovord Safety Button Automatic Shutoff Switch 8 VU Meter (Lefty @DVU Mevor (Rt & sterwo Headphone Jack 3 Power Switch 58 Volume Contel (Right Tone Control (Right) 8 Voltage Selector Switeh & rus Post ® cycle Conversion Switeh (BY B Speaker Switeh 96 External Speaker Sack (Lett) 5H External Speaker Jack (Righ0) Line Input ck (Righ®) Line Output Sack (Right) GOIN back @ Line Output Jack (Lett) @ Line tnput tack (LeftyIV. DISMANTLING OF TAPE TRANSPORT UNIT & AMPLIFIERS @) Loosen the SCREWS (marked from (@) to (@)) by using 2 philips-headed (2) Loosen the RETAINING SCREWS of the PINCH WHEEL (A) using a (@) and (b) of the DECK CONTROL. KNOBS (A) and (B) by using a Philiprheadod screw driver and re- ‘move the KNOBS by hand, philipsheaded screw driver and re move the PINCH WHEEL by hand. screw driver and remove the DECK PANEL (P) by hand. (4) Loosen the SCREWS (marked from (2) to (4) by using a phiipeheaded serew driver (© Remove the TAPE TRANSPORT MECHANISM ASSEMBLY AND AM- PLIFIER ASSEMBLY (D) ¥y slowly lifting it from the CASE (C) is shown in picture SES 7) Disconnect the PLUGS (marked (3) (8) Loosen the SCREWS (marked from (9) Separate the TAPE TRANSPORT to) carofully by hand, (@) to (@) of the DECK FRAME by MECHANISM ASSEMBLY 4€) from using a philips headed serew driver the AMPLIFIER ASSEMBLY (A) carefully by hand, aVv. TRANSPORT MECHANISM Fig, 1 Fig. 2 DRIVING OF CAPSTAN Figure 1. (A) Motor (B)_ Driving Belt (flat belt) (© Capstan (D) Flywheel High-speed rotation of Motor (A) is reduced by Driving Belt (B) and transmitted to Capstan (C), which is con- nected of flywheel with ample inertia. This enables the rated rotation by absorbing minor rotation distortion of motor itself. Capstan Rotation: 606 RPM. at 7-1/2" (19 em) per sec. 303 RPM. at 33/4” (9.5 cm) per sec. 151.5 RPM. at 1-7/8" (4.75 em) per sec. Motor Rotation: 3,000 to 1,500 RPM. at $0 Hz. 3,600 to 1,800 RPM. at 60 Hz DRIVING OF PINCH WHEEL Put tape between rotating capstan and pinch wheel and push pinch wheel against capstan, this will transport the tape at rated speed. The appropriate pressure of pinch ‘wheel is between 1,000 to 1,150 grams at the tape speed (of 7-1/2" (19 em) per second. RECORDING AND PLAYBACK ‘Turn the RECORD/PLAYBACK KNOB (A) to “PLAY” position, and_ pinch wheel presses aginst capstan to nove tape at the rated speed, At the same time, Idler (B) moves between Motor Bushing (C) and the Take-Up Reel Spindle (D) to transmit the motor rotation to (D) to thatthe tape is moved and wound on the take-up reel The Take-up Reel Spindle Base is made up of two pla tic rollers (1 and 2) with a clutch felt in between. The Idler is rotating the plastic roller (2) underneath Therefore, the tape-winding friction i adjusted by the Slipping ofthe felt to maintain rated winding of the tape On the other hand, the Supply Reel Spindle (H) has a Brake Rolle (E) hung on the Plastic Roller (4) under- neath, which provides approprite back tention by the felt clutch slipping o the rotation ofthe Puelly (3) abore. To prevent accidental erasure, the Record interlode Button (F) must be depressed before the RECORD/ PLAYBACK KNOB can be moved to the “REC” pos tion. The Safety device (G) is depressed to operite the recording mechanism. (See figure 2) aFAST-FORWARD MECHANISM Turn the FAST FWD-REWIND knob (A) in “FAST FWD" position, and the cam (B) under the knob pushes up the Lever (C). The Idler (D) moves into the space between the Plastic Roller (F) above the Takeup Reel Spindle and the upper part of the rotating motor drive bushing to transmit the motor rotation to the takeup reel spindle, At the same time, Brake Rollers (H) and (1) ‘come off the rel spindle to free the Supply Reel Spindle GG), thereby allowing fast winding of the tape onto the take-up reel, (Gee figure 3) REWIND MECHANISM ‘Tum the FAST FWD-REWIND knob (A) in “REWIND” position, and the cam (B) under the knob pushes the Lever (C) up. The Idler (D) moves into the sapee bet- ‘ween the upper part of the rotating Motor drive bushing (©) and the Intermediate Pulley (F) to transmit the high- speed rotation of the motor through the intermediate pulley to the Supply Reel Spindle (G). At tie same time, Brake Rollers (H) and (I) come off the ree'spindle to fie the take-up reel spindle (1), thereby rewinding the tape into the supply reel ata fast speed. (See figure 4) STOP CONTROL Tum the stop lever in “STOP” position, Brake R oller (A) and (B) depress reel spindles to stop rotation of the reel spindles. AAs the brake rubber depresses the plastic rolles under the reel spindles, no friction works on the tape ite If, (Gee figure 5)Fate] Rewind |Takeup] Supply | Modes of Opention | Pit |idier [toler | side | side ‘whedt [Wea Woa_| Brake | Brake (stor x |x {x j}olfo qpeasrroawarn} x | o | x | x | x (9 REWIND x |x |o |x |o recone | o | o | x | x | x [O etavaack l NOTE: X-marks indicates “open” and (O-marks “engaged” RECORD/PLAYBACK CHANGING MECHANISM By turing the RECORD/PLAYBACK KNOB (N) to the recording position, the CAM (a) pushes the RECORD- ING LEVER (6), as illustrated in dotted line. Then the LEVER (b) pulls the RECORDING LEVERS (d) and (©, which are joined with the RECORD/PLAYBACK CHANGING SWITCH (SW1) to be turned to recording position. If the LEVERS (b), (d) and (e) are not pulled property, the (SW1) does not operate properly, so abnormal osci- Intion may occur and also recording cannot take place, ‘The LEVERS must be adjusted to proper position by Toosing the SCREWS (f) and (8). REC dm PLAY ie Fig. 6VI. MECHANISM ADJUSTMENT 1. ADJUSTMENT OF PINCH WHEEL It is important that the pinch wheel shaft is kept in complete alignment with the capstan shaft. A proper piach wheel pressure is between 1,000 and 1,150 grams ‘when the unit is operated at the tape speed of 7-1/2 ips. ‘Any deviation from this specification will result in wow and flutter. Check pinch wheel pressure by 2 spring scale, and if necessary, adjust the pinch wheel load spring, 2. ADJUSTMENT OF TAKE-UP IDLER WHEEL ‘The takesup idler wheel must be kept in complete align- ‘ment with the take-up reel shaft. When the unit is set in fast forward condition, the idler wheel will contact ‘with the upper knurled wheel of the take-up reel shaft assembly, and it will contact with the lower knurled ‘wheel during record or play operation. Adjust idler wheel load spring so that the idler wheel pressure is kept between SO and 80 grams. The idler wheel rapidly ‘wears if the pressure is excessive. Slippage occurs if the ‘pressure is smaller than the specification. anche ob conical op SE ace rote = te = 3, ADJUSTMENT OF REWIND IDLER WHEEL ‘The rewind idler wheel must be kept in complete align- ‘ment with the rewind reel shaft, The amount of pressure to the knurled motor bushing should be maintained about 50 grams during rewind operation. Adjust both the idler load spring and rewind roller. 4. ADJUSTMENT OF INTERMEDIATE WHEEL ‘The intermediate wheel is located between the rewind idler wheel and the rubber ring which is used on the upper part of the supply reel shaft assembly. When the unit is set in rewind condition, it will contact with these parts simultaneously transmitting torque of motor. An adequate pressure is 50 grams. Adjust the load spring of the intermediate wheel if the pressure is not sufficient. 5. ADJUSTMENT OF TAKE-UP REEL SHAFT ASSEMBLY A felt clutch material is attached to the bottom side of the reel table base plate so that recording tape will not be stretched during fast forwarding operation due to excessive tension. To check the amount of ftietion of this part, place a 5.inch reel with recording tape wound by 60 m/m in diameter, and gently pull the end of tape upward using a spring scale. Adjust the conical spring so that the amount of tension at this part will be kept bet- ‘ween 400 to $00 grams. Another felt clutch material is attached to the takeup drive wheel. It is to provide proper slipping operation during record or play mode. ‘The procedure for checking friction of this part is same as the foregoing, and between 150 and 200 gams of friction will provide the best result. Adjust the star- shaped spring just under the take-up drive wheel, When the unit is set to rewind operation, the amount of friction of this part will be greatly reduced and will become 15 to 20 grams. Check to see whethe this is satisfactory, if not, readjust the starshaped sping for Brake, and spring retainer washer accordingly. (See figure 1 (b) at left) 6. ADJUSTMENT OF SUPPLY REEL SHAFT ASSEMBLY Felt clutch material is used between the lower side of the reel table base plate and the rewind cubberring to protect recording tape from excessive tension duing the recording operation. To check the amount of frit ion of this part, place onto the supply reel table a S—iich reel with a tape 60 m/m in diameter, and gently pull he end Of tape upward by a spring scale, Adjust the oonical Spring so that the amount of tension is kept tetween 400 and 500 grams. Other felt clutch matirial is attached to the rewind drive wheel to provide proper slipping operation during record or pay operatien. The procedure for checking friction of this part i te sme a the foregoing, and between 80 and 120 gnans of friction will give the best result, When the unit set to fast forward operation, the amount of friction will be sreatly reduced and wil become 15 ~ 20 grams. Check to see whether this is correct. I not, read st coil spring and spring retainer washer, (See figure 1 (@) at ie)@) (B) © ADJUSTMENT OF HEADS Adjustment of Head Height (See Fig-2 and Fig3) Erase Head ‘Adjust the height of the Erase Head by turning the height control screws (a) a’) as the upper edge of the tape passes through until it is just 0.125 ~ 0.15 mm under the top edge of the CH-1 erase head's core. .. Playback Head Adjust the height of the Playback Head by turning the height control screws (b) (b’) as the upper edge of the tape passes through in the same way as the top edge of the CH-I playback head’s core, ‘Adjustment of Vertical Azimuth of the Head ‘Ajust the vertical azimuth of each head (erase and playback) by turning the height control screws (@) to (b) until the tape contacts each head Properly. ‘Adjustment of Head Alignment Playback Head Playback an Ampex Alignment tape (8000 Hz) at 7-1/2" tape speed and turn the alignment control screw (c) until the out-put level of both channels reaches the maximum. 0.01~0.025mm ab fo)Vu. AMPLIFIER ADJUSTMENT 1. ADJUSTMENT OF RECORDING BIAS FREQUENCY (Fig. 1) a, Put on the resistor 10 or SO ohms in series with the Bias Head and connect the Vertical Input Terminal of the Oscilloscope to points (a) and (b), ». Feed in the sine wave signal from an Audio Frequen: cy Oscillator to the Horizontal Input of the Oscillo scope and tune the Dial of the Audio Frequency Oscillator until the Oscilloscope displays a circular or linear pattern. c. If it reads 60 K Hz +5 K Hz, the Recording Bias Frequency is correct 4. If it is not comect, it may be adjusted by inserting another condenser (C-11) value 560 PP. 4 | OscILLOScore UDG FREQUENCY cov Fig. 1 torsoa aH 2. ADJUSTMENT OF RECORDING BIAS VOLTAGE (ig. 2 Connect the V.T.V-M.to the point (A) and (B), then read the figure on the meter of the V.T.V.M. b, IF it reads AC 35 V £5 V, the Recording Bias Voltage is correct. c. If it not correct, it may be adjusted by inserting another resistor (R-1T, 18) value 68 K Ohms. 3. ADJUSTMENT OF ERASING BIAS VOLTAGE (Fig. 3) a. Connect the V.T.VM.to the point (A) and (B), then read the figure on the meter of the V.T.V.M. , If it reads AC 47 V + 10 V, the Erasing Bias Voltage is comrect. . Ifit not correct, it may be adjusted by inserting ano- ‘ther regulator coil (L2, L3) value 22 mH.vill. MAINTENANCE PROCEDURES 1. LUBRICATION INSTRUCTION For maximum service life and optimum performance, lubricate the parts identified below after each S00 hours of operation. Use only light machine oil of good quality. Motor Flywheel Assembly Rewind Idler Wheel and Wind Take-Up Idler 1 drop Intermediate der 1 drop Pinch Wheel 1 drop Also apply a liberal film of light machine grease to each roller surface of all levers and cams. CAUTION: DO NOT OVERLUBRICATE, AND WIPE OFF EXCESS OIL WITH A COTTON SWAB SOAKED IN ALCOHOL, OTHERWISE, EXCESS LUBRICANT MAY BE SCATTERED DURING OPE- RATION, AND THE RUBBER COMPONENT ‘NENT PARTS WILL DETERIORATE. 2. CLEANING TAPE HEADS AND OTHER PARTS Wipe surfice of tape heads, guide roller bearing, capstan bushing and pinch wheel periodically with a soft cloth soaked in alcohol or carbon-tet. a) ES} 6MEMOIX. REPLACEMENT PARTS TABLE 100 200 300 400 500 600 700 800 900 HEAD BLOCK REEL ASSEMBLY BLOCK SWITCH BLOCK MOTOR BLOCK FLY WHEEL BLOCK MECHA. FRAME (front & rear) PRE-AMPLIFIER CARD (1 & 2) AMPLIFIER (1, 2 and 3) CASE & TOP PANEL BLOCKHEAD BLOCK Les.02 Lcs-103 Less23 > Les-1018 __- LCS 101 7 este Les:to1f Los:o1e Les101n HEAD Head Assembly, Complete Erase Head Record/Playback Head ‘Table, Lifter Pin (with Lifter Pia) Screw Flat Mould 4x8 Prop C, Head ‘Spoke, for Lifterte uesa03 —— - esa0ty = cso, 8" tcsate = eS 18-2019 baad 05-20 i SB sc yee teste AG2In cent Us 2049 SS Sepa cron — row usssoe SOD e= esabie (S208 ‘SUPPLY REEL TAKE-UP REEL REEL ASSEMBLY BLOCK Les.204 teen Les-20s 18-206 Supply Meet Assembly ‘without Head 4x7 Paley, Ree! Shaft (Star Type Metal Fiting Ay Holder, Reet Shaft (Gtr Type Spring) Take-up Roter, Table C, Reel Plate, Reel Table Screw Flat 336 ‘Take-up Reel Aswembly Nylon Tube Sere, set sleeve Metal Fiiing 8 Reel Table Reel Shaft ae Type Spring) Take-up Roller, B Spring G, Right ‘Take-up Roller, A Meet Shaft A, ‘Take-up Keel Pate, Reet Table Setew Flat 336 Holda tssaoin Les 301p Les301m Lessor Lesani, ~tes2011 esaoe ues 01 -f tessa Stosaons | 108305 4 vosis Lesaoe ty, tian 2 I? Sp 108204 SWITCH cz SWITCH BLOCK Lcs-201 Lcs:302 Lcs-303 Lcs-304 Lcs-305 Switeh Block Switch Table, A Lever, Fast/Forward Rewind Shaft Switeh Table, B2 Pin Washer Screw Bind 3x5 Record/Playback ‘Conversion Pia cam ad com B ‘mm Ball BearingLes4o1e— es 401 — Lesaari MOTOR BLOCK Lcs-401 Motor, Complete Screw Flat Mould aes Stepped Pally | alt Holder Motor Pulley Motor Holder Hexagonal Nut Motor Fan, D Serew, without Head as Prop A, Motor (6322.5) Prop B, Motor ex21.5) Holder, Motor Condenser MP Condenser uf (@60v Ac) Wire Wound Fixed Power Resistor (450 22081)Lesson. Loss02 tos s02 A > ——esso1e Lesso1e teste Lessoie te Les08b Less FLYWHEEL BLOCK Les-s01 4 Lcs-s02 Lcs-so4 Les'sos Flywheel, Complote capstan Main Metal Case ‘4mm Bal Bearing Plate, Fiywheat Prop C, Flywheel Washer Wing Nut Prop &, Flywheel Washer Screw, Flywheel Adjust Drive BettMECHA. BLOCK (FRONT) Lcs-601 Lcs.602 Lcs-603 Les-608 > % Les. 60% » Lcs.608 Lcs-s10 . Lesi2 Les-613 Lessee Les-a16 » Les-617 Deck Frame Prop, Panet Prop, Tape Guide Table B, Tape Guide ‘Table, Washer Dearing (635322) “Table, Washer Washer “Table A, Tape Guide Complete Pulley, Counter Plate, AS Lever 2 mm Ground Lue Serew Bind 3x5 Spring, AS Lever [AS Lever, Complete Recording Safety ‘Botton cam Stopper Insulator Pate, ‘cam Stopper Fiber, cam Stopper Screw Flat Mould 4x8 6? Slide Switen ESS220ND Screw Semi-Cubie 325 6P Slide Switeh Shaft, Lever A Lever B, with Lever E Cam Roller, A Cam Roller, 8 Spring, B Holder B, Spring Holder, Lever G Metal Lever, & with Idee Shaft, B Spring, ler ‘Stopper, Lever G ‘Sha, Pinch ‘Wheel Lever Lever, FA Cam Roller, A Pin B, Speing ‘Table, Lever FB Spring, Lever FB Serew Flat Mould axto = Lever F, (for Motor) Fiber Washer Shae, Supply brake Lever Les-6a Les.623 ® Les-624 ® Lcs-625 . Lcs.626 Lesa? Les-628 Lever, Supply Brake ‘Supply Brake Roller Screw, Brake Roller 3mm Nut Spring, UN-D. Shaft, Take-up Lever, Take-up Brake Take-up Brake Roller Serew, Brake Roller 3mm Nut Washer Pin Spring, D Lever, A (with Lever E) Washer Pin Washer Wacher Fin Lever, C3, ‘Wather Pin Spring D Lever, Pinch Whee! shaft A, Cam Roller (Cam Roller 8 Sha C, Pinch Wheel Spring, A Instant Stop/Pause Stopper Instant Stop Screw Bind 3x5 Serew, Retaining Instant Stop Lever Spring, Instant Stop Le Holder B, Instant Stop Lever Serew Flat Mould (Cam A, Head Lifter (Cam B, Heed Litter Spoke, for Lifter Lever K Screw A ‘Torsion Spring, D Idee Woe! Washer Wather Pin Internal Wheel Washer Pin Prop, Miero Switch Micro Switch MB.3 Screw Flat Mould Washer Hum Bucking Coil or) Holder, Hum Bucking Bo}® 105-629 Les-630 Les-303 Lcs-304 Lcs.205 Screw Semi-Cudic 322 a mm Nut aP Hack 3P Lug Plate iting, ‘elt Change Lever cam a2 ‘mm Ball esting PINCH WHEEL. cosszze = 1038220 —Lesazee Los 6266— Les62se N ves-se Leseree Use Les-oae: tesers | | bessise xcs 308 Los-sine “Les610 Lessi0y PS vos608 =) &e tT oF AW Fuss eS LE —.esso7e (J sow ent GOS SRP seo FSB —tessa0e “Tose GED i cs.s2ee| L056. PSs ‘ i. Los613~ a teens © © 3 ra i teeste Les Losens Lessee. | SLoseosp L0S6060 css lesen © Lesa tes 6a7 — - Lese28-= Les62te Lest LosseeeMECHA. BLOCK (REAR) Les.602 Les.608 » Lcs.6a9 Lcs-620 b Lcs-632 Deck Frame Prop, Panel Index Counter, Bett, Counter Holder, Lever G Metal aP Jack Metal Fitting, Bett ‘Change Lever Lever, Bott Change ‘Spring, Belt Change Lever 31 Lug Plate 220 Ac Cord HolderPRE-AMPLIFD Lesa10 ses ER CARD BLOCK op B, Preamplifier Preamplifier Card Carbon Resistor 130K 1/9 (ROL) 100K 1/4.W (02) 2.3K 1/8 (R03) 10K 1/8 W (Ra6} 390K 1/4. (Ros) SC-#5916 (C.D) Vertical Mounting Type 0.0034 s0¥ (96, C08) Electrolyte Condenser 10x 10V¢Co1 , C03, COs) Polyethieae Condenser 470P (X) s0WV (Co:2) Payback)i (crs REE AMPLIPIER BLOCK [ Les.so3 res-soa Lcs.408 Les.s07 Lessor Lesai0 Les.913 reste Chassis A, Speaker Speaker $x7 Sere Fat Mould 4312 Chasse Speaker Speakers <7 sw Flat Mohd 2442 Speed Nut miifier Chass Vu Meter Power Fransfocmer OutPes Transformer [Andle. Changing Voltage 62 Slide Swish (Cycle Chante Name Plate, Cycle Change Socket, Change Valtae Hexigonat Bop, Selector Name Plate, AC Change M3Cop Buse (154) Power Supply Cort Rubber Hush, Power Cord nat ecaa CARS ‘Vacuum Tube Socket 9P Mould Type 7H Mould TyB0 4B Socket Switch Track Selector (#P Sh Speaker ON/OFF (6P Stide) Power ON/OFF (Toesle) ‘Cycle Change (6? Slide) Task External Speaker (2 Conductor E Jacky MIC. ( Conductor E Jack) Headphone (3 Conductor E Jack) Pin (2 Connectivay(2 used) DIN (SP Receptacle Socket) 1710 Nam Reconding Lever Bl Lever, Recording Lever, Recording it Binding, Washer Hd. 34 Holder, Fenion Shaft ‘Spring UL Lock Lever Phot Lamp Lamp Socket Amplifier Knob A(Tons) Amplifier Knoh Volume) 826AMPLIFIER BLOCK I Lessor 1cs-802 test ® 18613 Lessa 6 Lessis » Lcs20 Lese2a Less2s Chasis A, Speaker Speed Nut ‘Chausis B, Speaker Speed Nut VU Meter Vacuum Tube Sosket SP Mowld Type TP Mould Type “Track Selector (8P ste) Power ON/OFF (Tortie) Jack External Speaker @ Conductor Jack) Mic. @ Conductor E Jack) Headphone (2 Conductor & Jack) Pia @ Connective) (@ wes bin (0 Receptacle Socket) los Lamp Lamp Socket ug Pate au 13 3 Lug Terminal Type Blectroyie Condenser 100+ 1001 3504 20+ 208 380 ‘Tubler Type Eleowolytie Condenser 1008 3 1) 504 25 (C4) 31 350¥ (€9) 204 Sov (©35) (ut Tublar Type Condenser 0.01n 400 (C2, €3, C6) 0.0024 00¥ (C10), 0.0014 400 (C5) FM Condenser 3003 S00V (C7) 561) s0o¥ (C11) 1015 s00V (C12, C12) 2511 soov (C14) Mylar Condenser FNX 0.334 100V (C8) MPL 0.1m s0V (C20) Volume /Tone Coatrot (500K/s0X) carbon Resistor 100K 1/4 (1, RS, RIL, R16) 39K 1/8 (2) 3.3K 1/9 (KB) S608 1/3 (a) 1500 1/4 (RS) 390K 1/aW (7) 82K 1/4 (RS) 12M 1)4W (R10) 1ess26 Lesa27 Lesaae 6 Lcs.29 Les710 Lessons Leen 5.08 1/9 (R12) 39K 1/4W (R13) 220m /aw (R48) 68 1/0 GRA, RIB) 53K 21 (R20) Fixed Composition Resistor 709 1W (AD) 68K 1/4 (R19) 2.7K 1/2 (821) S808 1/aw (R22) ‘Wired Resistor sa rw ts) 33001 6P (R23) coi 6s mH (Lt) 22 mil @ used) (12,13) Oxcilator Coil{60Ke) Preamplifier Card Complete Fone) Amplifier Knob B (Volumessim oat sae tose testa osCASE & TOP PANEL BLOCK Les90: Les90s Les906 1c$907 1cs-202 Lcs-204 ucs20s Lcs-so1 Lcs.so8 Lcs-60s 4 Les-607 1cs-608 case Assembly, Com Table, Rubber Foot Rubber Foot Screw Semi-Cubic 3x18, Serew Truss 3x12 Ventilator, B Screw Truss Panel Escucheon Rus Plate, Speaker Speaker Reflector Holder, Speaker Reftector Screw Truss 346 Front Panel Head Cover with ‘Name Pate CCapatan Rest CCapstan Holder ‘Serew Truss 3x6 ‘Screw Truss 4x8 Tape Cleaner, ‘Complete Base, Tape Cleaner Cap, Tape Cleaner Tape Cleaner Pad Holder, Tape Cleaner Pinch Whee! Metal Cap, Finch Wheel Screw, Pinch Whest ‘Knob, Record/Playback Rewind Fast Forward ‘Amplifier Knob A. (Tone) Amplifier Kod B (Volume) Supply Reel Assembly Table C, Reel Plate, Reel Table ‘Take-up Reel Assembly Reel Shaft A, Takeup Plate, Reel Table Prop, Tape Guide ‘Table A, Tape Guide Index Counter, ‘Complete Plate, AS Lever ‘with Prop [AS Lever, Complete Recording Safety Button (6 stide Switen ESS-220NB {6 Shie Switeh Lcs-630 Les-08 Lcs-813 Jostant Stop(Panse Metal Fiting, Belt Change Lever Lever, Belt Change VU Meter Switch “Track Selector (8? Side) Power ON/OFF (Togste) ack (@ Conductor Jack) Headphone (@ Conductor E Jack)xX. TROUBLE SHOOTING GHART SECTION “A" TROUBLES WITH AMPLIFIER A. Playback problems. (Unit set in play position.) 1. No sound from loud speaker. ra] L Deteetneawiten} [Steck ana veiuc Vaccum taete |_{is fom iu fi [ran } fom [ini eaten ot} ara | |_| Detective top or an stage | transistor (PRL TR2) | [Reve | ince Fehr ame] 2 (aR |] [Sa rd oc] [0 to] [-{Beecie power cut abe. (608sT} ———[ Rapa] ‘Gheek weitagn, and Tnlave 2. Sound from speaker but insufficient volume. ‘Beicive TRL TRE Rene Diniy bead arta | ‘lest bade geatly with cotion oad scsked im mtbing lech Be) veleage ‘Gheck Tube (AGHA), C19, GIR. Ras fern ae 3. Sound from speaker but with loud hum, —& item ot controlable wit volun conto —[Reslave VV] ctv C16 REY of OK C1} ———[ Rape] Hap aliced wes playa —=—=—==— ow ial Sting 6 Bu Dead aot poe Tepe Bad aa a ip erat } | Obst and per ‘nacre Tap bakes oa on of a Read jt ban bsg Unit ples wp extemal sageetic fie ee ee) Ta ay oo pe be | Re ‘RO him without tape. a x a4. Intermittent noise. [ie ever contrusse win {Bese FAT FG} [Repace Tai Fz] Eee —— | fosrctine 3, Check aad nae ae il wet Cota wt (imme Te} rine ce, une vit {Detective va v2} _[Reviace WIV] Deteine BE] -—_{tieer na] iat eater ag Bao Chase aad aT HTN 5. Constant background noise from speaker. Taro oe vee] ie a age] $a oe | Gras mses] [Rese cind vor] 6. Lack of bass. 7. Lack of treble ‘ecortng tape ia aloe contact [Dir ead wae Gian abe ead ‘ith tape Beads Wear back tae ‘heck seppiy roo sat asseaiy and readjust spring toaion ‘econi/play beed wipaligned (hawo0) slaguent of gap ia coring baud) 8. Sound distorted, Dafictive TAL of FRA ‘epics TRL or TRE, (heck component parts in ccalt by wear (iearesr srs tag} Steag vonage Sev witag dng. 1 ule votage Dafesive oud speekor Replace loud speaker Ro-si heed using standard algnnest tapeB. Recording problems. (Unit plays back pre-recorded tapes okay, but recording not satisfactory.) 9. No recording possible. (Wier cee sot eat on eet} -{Beretve sic haar aa ce eR] [-{lepit ick aoe oot soap snd contact |} ——[ Check and wadast aput ack ] L[Rec/Ptay cota svtcn does wot function proper, ‘Check secon vor which atuntes rotary Svat 10. Sound distorted. Vu-aeter factions somali, secon tng aoatorthreagh extemal earphone io normal ‘Waster usctoes soma ber Vibrator reads okay on reco }-———-{ Doioetive recor pay head ‘Check secon ay Baad place cerry, Defevtve OS C7 AIO.RA, CERT Faulty recording tas Gra orang pontor trough eafhone abuse ~{( Bisse wzoring apt ive | {Bokeh esd wie wicnng creat} ——{ Check la wis wad oar] Measure recording bias valage Obeck | ¥aLL cw Ri? Fruity coment caren cre — [Ghee 0607 8, wT Check and pace, Tower recording ase eoatrt ioral BF 11, Erasing problems. [REG/PLAY Rota Gvtch dove nat fctien prope. ‘heck resoed lever which aetaloa lay anit, [ Detective wiseptine or defective | oa external an pifior carn i-aiar eat aa Tapace Vater Tat oat 960 orase Wal Defective orise bead ‘heck ead coll wih tester and pace bead if on burned tt Deivotve OM wad ak C14 md La as nannies [ Biaies ead vite easing casa, Tier hat vie eT] (ieee ea} ata 12. Insufficient treble on recording, | Sra ba vagy ot Bat oo} Lead coi beg storie Gieak aed epee] (heck bias voltage wich VTWM (Vacuum ‘Tube Volt Mote) and cwadet fo regular veltge Reples Bead samen13. Noisy recording. (Constant and loud background noise recorded on tape. } Teoring bas vave-lom autor 14, Low recording sensitivity, Check V5, O80, CH, Hi (Liisa ates tomas} —, ;—[[Recorsing tape let eonaitivig + ———— a aa wa wr Tha bal ES a a Detective HO or RIL {Ropuace #20 oF BD]SECTION “B" TROUBLES WITH TAPE TRANSPORT MECHANISM. 1. Capstan does not rotate, (Faties vib acter (heck felt cat with tester, and replace ‘Trecbies wilh power Laaiasin LY sexe torsign mater nists bowoen rotor Boies Gale cal Difecting aolar auring capstan Oe oa Ovetbat motor Clean ant reaaorcate Roi stat imezine be al area re cos broken ‘heck aaa sinste comien water or fave rotation of toe {Broken capstan cave bait} renenea {Broken capslan eve bat Repace batt] oss ave belt off of diving poaiane Motor bushing siping ve wolor sbae Tighten wountag sore [i sasha asa Bam wor emsor } | R69 97 HE Son ova ates [Place belt a poston 2. Capstan rotates in Stop position, but tape does not advance when switched to Play position. (Futter via some } ‘Troaine Wil power Uaaniseion {Dec ochnion a _woter torque, }_——{Gheck wotor tongue ane neplace Bowe] Captus dave alt atelcbed wp {iesisce var] (Capstan Wasting sibug on Gyre eat acassive tension wTakeap/Supply wal table scent. [Ol attached to capstaa andlor pace bee (Woe off ol, Tasufiieat pach vbeel pressure {Ou stashed to wotor busing sllor tpvbeset [wpe ofr a] (Check and reads pinch vive! pene 3. Capstan advances tape, but take-up reel does not take up tape. ‘esl batt draaing div to ek ofa] Takeup llr vheel cee wot lewp Good {nee akeup rel oat ssentiy_] ‘Takeap Wier whee dove oot als eee Te ae fs = ‘ik aacnd o Mir vive ae or : oiler on take-up reel shaft assembly. (OReck ie er tensioe spend. Replace aprag if eeeeaeny Sheek aver4. Take-up functions nomally, but tape speed lower than regular speed. aa }—_— Defecive motor staring capacitor COE tor stat Gragg due to lk of ol ‘Oveian)aotor. Olean and relubarate lite meat Repace Ce (Fiuctintioa ie power sppir.} — [Geek ne lage sel pele. Toe welbge paar [Provates with power trasemissin| ‘apstan dave belt oetsied up and aliping peasnon fn motor basing Traiae with aoe 5. Wow flutter. Irregular tape | feaetas an praia. Tit ot in core ving [Sr staceet nai bane or OL movement, (elke volage Ws lover tas staan Place bet i positon Wipe off a Cheer otor tree ‘Tecles wilh power trasmigscn ‘Take. oupply wel salt dragging excooave awineatn ‘heck veel stat aspeablos. Replace fal sat assenbly if tension ot atest ‘Ganon Give Galt saved op Sd SRE Tatas fen wien. [Gbeck belaca Replace fpwanel ‘heck ber oe pach wheel and epee |L{nateer on pach viet deteriorated] pines wheel lack vieel or tape gude dove aot late Heck and ropa defective part. Cees sai 6. Unit doce not operate in Fast Forward made, fncctaly [Reo tit agus provides sucothrtatice Diviy Head rice (Seas aad] Reet pi wise! presaur “Fahien sapelan Bomaing sere pace vorvoat idler Labrcate oils neta i cen of le, fFaieap wel stati does wot tate eves witost placing recoring tape on nit ‘Treibles vil power tratapission nectanisn. |] | wheel or note bain Ou atached te tkeap lor % ‘Dewae aotar bating Tighten nett boeing wowing fanetice pepe ‘eloup Wier Heel doe Ta rap Fel att assenbly oes nt faction proper |_[ cueck, clean ant Reloe) stat aeseabiy Cheae ver"p al cig tape is placed om unt 7. Unit does not rewind tape, batt dove aot tale when Deceased wolor wage [Betecuve motor waning capacitor Cone, Brcoseve slippage of cutee sateral (el) take-up cel aft assembly Troables with power tsnanissioe mechani, [Obeck and replace (heck anerp eel etait sino. Cheek motor tows] Replace wotor if require ‘Tepe pide ober doe wot [heck gute vole: Reo or rotate scotty place taxerel warped aod alickng te deck tp panel ‘ply sewnd) rook ata done aoe ‘aie oves witout placieg rcortng tape oe aut ‘Supny(evind) wel aba dows aot rotate wien tupe la ptced an unit ‘Trebles with power msn ae ‘Oi attashed to vind ie or motor tasting Tnterneaate ler (bck Tatsite whoo) aot woking eae Woe off ou] | {oink iterate Tignes motor bushing mounting Rewind ier does oot wtate|_[ Check rvid i or ot position. Clesn aaa 00. ‘Trowee nih motor Deceased aot? trae Supply rel sbett assesbiy] (Check supply wel shaft dows not state snooty scene Clan and Re-cit ‘Sheck Goto tagee. Replace ator if not repli, Detective motor aaring capaciar Cet Excessive alippage of eae ‘eter tlt) in sappy ret staft assenbiy Frsube wih power tmsrissica nectsnion piece once | foneck spay soot enate : ssoenb Tape guide vale does aot ‘heck guide ler Rewil or pace Sippy rend rel warped and sucking to dec top panel 8. Loose tape winding after being placed in Rewind or Fastforward mode. ‘Docrssod back tnsion of take a supply rol sft assenbes 9, Tape spills when stopped from Rewind or Fast Forward mode ‘Bxcessire slippage of felt catch ‘Readuntalppage of Toh eateb mater] ater take-up ané rewind rel ‘Shaft ascanbie, Replace defective reel shat ascenbiy if his radustment is ial Wools of Giferent ae are aad or example, See ob takap sie and 7 ea on supply ede Always aap Wels of sane wae om Doth ides10. Brake does not function properly. Reraat bike shone [Oi atiached to surace of trans cices_}—[Wips offal wih cotton evab onaked im alcool race Bake sabes [Fabien bake how (Brake Tove dove not Teaco Proven | [Check aad weadiat brake Iver 11. Periodical clack noise when rewinding or fast forwarding tape. hac lat vive [earn wad ragged iit wine 12, Loud motor vibration, 18, Squeaking noise when playing tape. [Ding bead aurface.} Chea beade Recoring tape is being charged wits atte electro. ed ‘Bicoosive Real co esd eurace aler rataued operation ad vorsoat recor FE Tapes econng pe Talon recording tbe ae reortng tape of go Gay 14: Automatic stopping device does not function. (Avonatic wap lever waves sormaly [Miers atch (8005) dows aot wom propery | —{Oheck S608 “Aanaie slop lover doos ack BOVE OF aa Brokes lover sprig of Iver epg aot i pontion}{Gheck lever opraa] [Avtonatic tip levor etch to rear deck pauel | [Chace rear side of deck bat] 15. Cycle change switch does not move. THe tant jel conversion lvoe. Reibrcate lever (Tapes sows ow] [Tigi aonig ee] [Wipe otf oi with cotton ovab soaked i accelMEMO 8MEMO 8MEMO1710W Jeon REYPB. Tab, eure ure p—— Jac REC/PB 2 6ARS via 1eaTrce enone Rig 12m IE Teese RIT 60H Cr OP Ril 100K ce aot rerrral 7 '30P aa 8K = a2 37, je m4 REGULATOR COIL 5 i AC 200" P any Le TH 228K] Cig 250P - 2 REGULATOR Coil. HEAD FR 3TH 2204 ERASE HEAD LINE INPUT RIGHT mic INPUT wo 280649 2sces0 = 330 REC/PB DINO LINE OUTPUT Vib Z_6ARS W2ATT CA) iJab ELM wreer p—— Jac REC/PB DIN OUT V2 6ARS = 330 REG/PB DINOUT LINE OUTPUT ARS on DIN Ja LEFT EXTERNAL SPEAKERS Cy swe Vq) SP HEAD PHONES, MI 1 Js ‘POWER SW AG. Pe wa RIGHT FUSE EXTERNAL 145A (00 ~ 120") SPEAKERS VA (200~240") TAPE SPEED LOW HIGH swso! x 7 He © 8 mh as u E08 Peo AUTOMATIC SW Ci 1710W SCHEMATIC 13422544 | 1 ! | |