Service manual

6-26-2
CS 49 123
33834
97-07-17
33834
97-07-17
3104 B 1
6101 A 1
3109 A 4
3101 B 4
2117 A 4 2111 B 3
A
A
B
B
A
B
A
B
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
1101 A 4
0001 B 2
2101 A 1
2102 A 2
2103 A 2
2105 A 2
2106 A 3
2108 A 2
1102 B 4
2109 A 3
2110 B 3
2112 B 1
2113 B 2
2114 B 1
2115 A 1
2116 B 4
2119 B 4
2120 B 1
2121 B 1
2122 B 1
2123 A 2
3102 A 4
3106 B 1
3107 B 4
3113 B 1
3114 A 4
5101 A 2
5104 B 2
5107a A 1
5107b A 1
5107c B 1
5108 A 1
7102 A 4
8100 A 1
9101 B 2
9150 A 1
9151 B 3
2103
2115
6102
9150
FM IF1
FM IF2
8100
2104
A
5101
5106
5107a
5107b
6101
5108
2101
2102
2122
2108
9151
3101
5104
7102
5105
3114
2109
2110
2111
11020001
1102
2123
2105
1
GND
TUNER-L TUNER-R
3110
3109
+A(FM)
+A(TUNER
1101
2116
2117
2118
2119
3102
9101
DISCR.
3104
5107c
3113
3106
2120
2121
2113
2114
2112
5102
3107
Tuner EVA .4, 021097
Tuner EVA .4, 021097
TUNER BOARD / component side view
TUNER BOARD / copper side view
2106
VARCO
VCO
MW-OSC
MW-RF
AM IF1
AM IF2
FM-RF
FM-OSC.
2103
2115
6102
9150
FM IF1
FM IF2
8100
2104
A
5101
5106
5107a
5107b
6101
5108
2101
2102
2122
2108
9151
3101
5104
7102
5105
3114
2109
2110
2111
2123
2105
1
GND
TUNER-L TUNER-R
3110
3109
+A(FM)
+A(TUNER
1101
2116
2117
2118
2119
3102
9101
DISCR.
3104
5107c
3113
3106
2120
2121
2113
2114
2112
5102
3107
2106
VARCO
VCO
MW-OSC
FERRITE
ANTENNA
FERRITE
ANTENNA
MW-RF
AM IF1
AM IF2
FM-RF
FM-OSC.
black
black
2118 A 4
5102 B 4
3110 A 4
5105 B 3
5106 A 1 6102 A 1
2104 A 2
C3
C4
C1
C2
FM-OSC.
FM-RF
MW-OSC.
MW-RF
12
B
A
C
3
2k2
4k7
7101 A 2
16 17
1 32
7101
16 17
1 32
7101
Input FrequencyWaverange Input Set tuned to Adjust Measure on Scope / Counter
OSCILLATOR
FM - RF
VCO
AM -RF
AM - IF
FM
1)
87,5 - 108 MHz
MW
525 - 1607 kHz
(530 - 1710 kHz)
2)
87,35 MHz
512 kHz
(525 kHz)
1635 kHz
(1720 kHz)
108,25 MHz
lower
band end
upper
band end
FM
87,5 - 108 MHz
87,5 MHz
108 MHz
108 MHz 2106 C2
5101
MW
468 kHz
5106
5108
FM 98 MHz 98 MHz
3101
152 ±1 kHz
3)
2106 C1
2106 C3
5104
5105
MW
560 kHz
1500 kHz
2106 C4
5102
(ferroceptor coil)
560 kHz
1500 kHz
connect pin 24 of
IC 7101 (AM Osc)
with short wire to
ground
2)
for USA /17
Tuner Adj. EVA, 021097
see
remark
4)
4)
RC-network serves for damping the IF-filter while adjusting the other one.
A
1 2
1 2
∆f = ±500kHz
V
RF
= 100µV
C
∆f = ±30kHz
V
RF
= 100µV
lower
band end
upper
band end
f
o
f
o
max.
symmetric
or
A
1
3
2
∆f = ±500kHz
V
RF
= 10µV
A
continuous
wave
V
RF
= 1 mV
or
C
1 2
∆f = ±15kHz
V
RF
= 10mV
or
or
1 2
B
∆f = ±30kHz
V
RF
as low as
possible
f
o
max.
symmetric
or
max.
V
cc
7101
pin 30
2k2
4k7
220R
100nF
10
IC 7101
220R
100nF
14
IC 7101
repeat
TUNER ADJUSTMENT TABLE
87,5 MHz
1)
Check if capacitor 2109 stands upright before starting adjustments.
3)
If sensitivity of frequency counter is too low adjust to max. channel separation
(input signal: stereo left 90% + 9%, adjust output on right channel to minimum).