Comparison and Test specification
Removal of Chassis 2. The control voltage at PIN 9 of IC 401 is set to 0.15V with the
resistance controller R 409. An analogue measuring device (e.g.
The notes marked with numbers refer to the expansion sketch embossed GRUNDIG UV 5 A) should be used.
in the bottom of the housing.
3. With the BFO/SSB section switched ON, adjust the trimmer
a) Pull out the mains cable connector and remove any batteries or the resistor R 703 so that the voltage drop across R704 is 4V.
rechargeable batteries that may have been inserted.
4. UB = 7.2V:
b) Remove the grip shell after loosening the 2 Phillips screws (1), (2). At a voltage of 7.2 V, set the display instrument to the battery check
c) remove the back panel (3). position with the R 658 controller so that the deflection of the
instrument is on the Dryfit Accu-mark.
d) Unsolder the connections of the two loudspeakers, pull off the antenna
cable and unplug the plug connection to the mains transformer. II. Adjusting the Charging Voltage UL
e) Pull off the knobs and unscrew the 6 nuts of the controller units With a mains supply of 220V AC and the receiver switched OFF, the
(potenciometers) (4). charging voltage UL is to be measured with an equivalent resistance
of 1 kohm and an electrolytic capacitor of 1000 uF (connect in
f) Release the four latches (5), (6), (7), (8) and remove the chassis from the
parallel to the charging contact and minus), the nominal value of
housing.
which should be between 9.05 and 9.35 V.
Alignment Instructions With a voltage of UL < 9.05 V, R 653 (connect separating point X)
All the voltages must be adjusted with the aid of sufficiently accurate must be connected, with a voltage of UL > 9.35 V, R 654 (connect
separating point Y) must be switched on.
instrument (e.g. GRUNDIG DM 44), and the given voltages should be kept
within the stated tolerances.
I. Adjustment of the Operating Points III. Frequency Counter
No signal, AM button pressed, range switch on KW1 U8 = 9V: Feed in 32.000MHz/80 mV to St V802 (3) and 2.460 MHz/50 mV to St
1. Adjust the emitter current of T 502 with R 504 so that the voltage drop V 802 (1) and with C0811 set the display to 30.000 MHz.
across R506 is 1.3V
IV. AM Alignment
Mod. frequency <1000 Hz
1. AM.IF
a) AM-IF Alignment 460kHz
Alignment Sequence Wobbulator Output Indicator Connection Alignment
connected to
IF-Filter 12 at MP 502 Probe loose on collector (I) For maximum
IF-Filter 11 and 10 at MP 501 T502 (MP 503) (II) and (III) for maximum
IF-Filter 9 and 8 at MP 401 (IV) For symmetry
(V) for Maximum and symmetry
Filters 9 and 8 only in connection
Adjust with the ceramic oscillator.
b) AM 2,46 MHz-Oszillator
K2-6 turned ON
Alignment Sequence Signal Generator Alignment Indication Alignment
coupled to
2. Oscillator 2.4MHz 2 MHz at MP 401 Output Meter (VII) Visually to center of C 459
(VI) for maximum
(VII) Fine adjustment C 459
c) AM-IF Alignment 2 MHz
Alignment Sequence Signal Generator Alignment Indication Alignment
coupled to
L 211 MP 202 Output Meter (XII) Put Out
IF-Filter 7, 6 and 5 MP 202 (VIII), (IX) and (X) for maximum
IF-Filter 4 MP 201 (XI) for Maximum
L 211 MP 201 (XII) For Minimum
2. AM-Oscillator, Filter and Aerial Circuit Alignment
Image
Band Range Oscillator Aerial Circuit Input sensitivity at 30% Rejection Oscillator voltage in mV
modulation 400Hz 1W pin 13/14 IC 401 or 201
6 db 26 db 1W db
160 kHz (1) Maximum (3) Maximum 3,2 7 49
LW 350
290 kHz (2) Maximum (4) Maximum 3 6,5 47
560 kHz (5) Maximum (7) Maximum 0,6 1,2 53
MW 320
1450 kHz (6) Maximum (8) Maximum 0.6 1,3 35
1,7 MHz (9) Maximum (11) Maximum 6,5 75 20 34
K1 280 - 300
3,4 MHz (10) Maximum (12) Maximum 1,8 23 7 29
3,7 MHz (13) Maximum (15) Maximum 4,5 60 5 32
K2 260 - 280
7,2 MHz (14) Maximum (16) Maximum 1,5 20 2 29
8 MHz (17) Maximum (19) Maximum 2 28 2,5 32
K3 210 240
11,8 Mhz (18) Maximum (20) Maximum 1 16 2 28
13 MHz (21) Maximum (23) Maximum 2 24 3 36
K4 220 - 250
17,8 MHz (22) Maximum (24) Maximum 1,5 18 3,5 27
18,7 MHz (25) Maximum (27) Maximum 1,5 24 4,5 27
K5 220 - 240
23 MHz (26) Maximum (28) Maximum 1 16 3,5 23
24 MHz (29) Maximum (31) Maximum 1 16 3,5 27
K6 210 - 230
27,6 MHz (30) Maximum (32) Maximum 1 16 4,5 20
Remarks: The order of the oscillator adjustment is arbitrary.
The ferrite antenna is installed in the order LW, then MW over frame With the KW pre-circuit adjustment, the signal generarators over 20 pF
men (90 cm) matched. Sensitivity values at LW and MW in at the base of the telescopic antenna. Vibration voltage at the 2nd
mV, at KW in uV. oscillator (V1): 290 mV.
3. Adjustment of Field Strenght Meter on After locking the core, adjust accuratelly with C 711 (36). Then
connect on trimmer C 709 (3...15 pF) (SSB switch "up"), turn fine tune
AM to the left. Stop and adjust for zero beat again with C 709 (38). The
frequency deviation of the SSB variometer is approx. ± 1 kHz.
With the AM adjustment completed, adjust the reading on the meter Because of the ceramic oscillator and the ceramic filter 19203-
at f= 1.7 MHz (K 1) and an input voltage of 30 uV to “1” with R 514 and 023.97, the SSB section may be aligned only when fitted in the
at an input of 100mV "9" with R 512. The setting must be repeated at complete chassis. The oscillating voltage at the emitted of transistor
least once. T 703 is approximately 60-70mV.
4. Control of the 2nd oscillator in connection V. FM Matching
with the counter
Unless otherwise specified, it occurs in the mono switch position,
Feed in 6.200 MHz to K2 with approx.. 100uV at the base of the with AFC and muting off and with a correspondingly low HF level in
telescopic antenna, ground St V 801 (4) and set the receiver to 7.740 each case in order to prevent limitation and thereby avoid incorrect
kHz with the tuning knob. At this frequency there must be maximum adjustment.
deflection on reader, otherwise adjust with C 459 or L 405. After
removing the ground bridge, the counter must show 6.200 MHz 1. Setting the tuning voltages
(tolerance +2 kHz).
At MP 302, on slider S of the tuning resistor R 349 (19701-037.03)
5. Adjustment of the SSB Section with the FM button pressed, and with the FM pointer at the right
Oscillator Alignment end of the scale, adjust the voltage with R 341 (10Kohm) to 30 V
Set BFO/SSB switch to off, "middle" position. On K2 at 7.2 MHz, with ±0.1 V. And with the FM pointer at left side of the scale, set R 348
a modulation frequency of around 400 Hz, adjust the receiver very to 2.1 V ± 10 mV.
accuratelly for maximum reading either on the output meter at low
level or on the field-strength mater at higher level. Then press a station button (e.g. FM 1) and set a voltage of 2.1 V ±
Set trimmer C 711 (36) optically to center position. Set BFO/SSB 10 mV with R 346 at point A MP 301 of the tuning controller 19703-
switch "down". 024.01.
With the trimmer C 709 (38) not connected in circuit and the core of
the SSB-Variometer 19415-010.00 (37) turned to the right side,
2. FM-IF Alignment 10,7 MHz
Alignment Sequence Wobbulator Output Indicator Connection Alignment
connected to
IF-Filter 3 FM counter connection cable Via clip-on probe with built in (a) Put Out
IF-Filter 2 and 1 diode connected to MP 303 (b) and (c) to maximum and
symmetry
IF-Filter 3 (a) to maximum and symmetry
(inner maximum)
3. FM-RF Alignment
a) FM Oscillator, filter and aerial circuit alignment
Generator Input sensitivity 22,5kHz dev Oscillator Voltage
freq. 1000Hz
pointer setting Oscillator Filter circ. Aerial circ. 6 db 26 db 1W Image At oscillator At mixer
Rejection emitter emitter
88 MHz (A) Maximum (C) Maximum (E) Maximum 0,60 uV 1,8 uV 0,7 uV 52 db
90… 100 mV 40… 50 mV
106 MHz (B) Maximum (D) Maximum (F) Maximum 0,65 uV 2,0 uV 2.0 uV 48 db
Note: Connect test transmitter with VHF signal (20 dB cable 60/150ohm, 22.5 kHz hub, 1 kHz module.) and adjust to the respective upper
maximum.
b) Adjustment of the display instrument at 4. Stereo Matching
FM Switch in "Stereo" position.
After performing the HF adjustment, set the pointer
a) 19 kHz setting
deflection of the display instrument to "9" at 88 MHz and
an input voltage of > 1 mV with R 371. Mute on, no signal. Connect counter to MP 306 (IC 303
pin 10) and set 19 kHz ± 1 kHz with R 377.
c) Muting
b) Stereo RF level
Muting switch pressed. Feed in signal of 5 uV at the
antenna input at 88 MHz. Open R 366 until the signal can Test transmitter modulated at 19 kHz, 6 kHz deviation
be heard. Then slowly turn back the same controller until at 88 MHz with 10 uV at antenna socket. Tune the
the still tuning (muting) switches. device precisely and slowly turn the R 384 from the
right stop until the stereo display lights up.
d) Checking the discriminator zero crossing
and the frequency display c) 57 kHz lock
After the HF adjustment has been carried out, with an FM station at 88MHz and one input signal
input voltage U9 >100 uV and f= 88.000 MHz, 88.00 MHz Modulate > 1 mV with 57 kHz (3.75 kHz deviation),
must be set on the counter. At the same time measure connect millivoltmeter to MP 304 (R 374) and set L 308
the voltage with a DC voltmeter on the MP 305 (IC 302
to minimum.
PIN 5). This value and the frequency display must not
change after switching on the AFC (observe the switch-
on delay). Otherwise, correct with the phase shift circuit
(F3).
NOTES:
