6-2
6-2
VARICAP ALIGNMENT
FM RF
FM IF
VCO
AM IF
AM RF
3)
108MHz
87.5MHz
(65.81MHz)
87.5MHz
(65.81MHz)
87.5MHz
(65.81MHz)
279kHz
153kHz
1602kHz
531kHz
5130
check
5122
check
5123
check
8V
±
0.2V
4.3V
±
0.5V
(1.2V
±
0.5V)
8V
±
0.2V
1.1V
±
0.4V
8V
±
0.2V
1.1V
±
0.4V
1494kHz
558kHz
560kHz
5102
1500kHz
5103
198kHz
1494kHz
558kHz
560kHz
1500kHz
198kHz
2106
5102
2106
3142
152kHz
±
1kHz
1)
98MHz
5112
MAX
FM
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
LW
153 - 279kHz
MW
FM/MW/LW- version, 9kHz grid
531 - 1602kHz
1700kHz
530kHz
5123
check
8V
±
0.2V
1.1V
±
0.4V
1602kHz
531kHz
5123
check
6.9V
±
0.2V
1.1V
±
0.4V
108MHz
108MHz
2155
5131
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
FM
MW
LW
98MHz, 1mV
continuous wave
450kHz
connect pin 6 of
IC 7101 (AM Osc.)
with 3.3k
Ω
to Vcc
Use Service Testprogram. By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically.
4
1
3
5
5
A
A
5119
FM
10.7MHz, 45mV
continuous wave
2
D
mod=1kHz
∆
f=
±
22.5kHz
1) 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)
Repeat
ECO6, Sys + PA with frame aerial, 070799
TUNER ADJUSTMENT TABLE
( ECO6 FM/MW- and FM/MW/LW - versions with AM-frame aerial )
∆
f=
±
10kHz
V
RF
= 0.5mV
C
see
remark 2)
220R
100nF
36
IC 7101
220R
100nF
40
IC 7101
2141
shortcircuit
to block AFC
21
IC 7101
max.
symmetric
fo
AM AFC
MW
C
continuous wave
V
RF
= 2mV
5111
5114
2
0
±
2 mV DC
0
±
3 mV DC
MW
4)
FM/MW/LW- and FM/MW-version
( 9kHz grid)
531 - 1602kHz
B
∆
f =
±
30kHz
V
RF
as low as
possible
max.
symmetric
fo
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
3) For AM RF adjustments the original frame antenna has to be used !
2) RC network serves for damping the IF-filter while adjusting the other one.
4) MW has to be aligned before LW.
Waverange
Input frequency
Input
Tuned to
Adjust
Output
Scope/Voltmeter
FM
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
FM/MW-version, 9kHz grid
531 - 1602kHz
(as low as
possible)
Playback
LEFT RIGHT
mV-meter
Check
limits see fig.1
SBC420
(4822 397 30071)
CHECK
PLAYBACK
FREQUENCY RESPONSE
General
TEST
CASSETTE
RECORDER
MODE
MEASURE
ON
READ ON
ADJUST
with to
ADJUST
MOTOR SPEED
SBC420
(4822 397 30071)
3150Hz
PLAY
deck A or B
PLAY
deck A or B
or
LEFT RIGHT
frequency
counter
3758
SBC420
(4822 397 30071)
3150Hz
LEFT RIGHT
SBC420
(4822 397 30071)
10kHz
LEFT RIGHT
PLAY deck A
W&F-meter check only
mV-meter
or
oscilloscope
left hand screw
max. output level
& left=right
CHECK
WOW & FLUTTER
ADJUST
AZIMUTH
3150Hz
±
1%
≤
0.4 % DIN or
≤
0.35 % CCIR
figure. 1
f(Hz)
level(dB)
8dB
6dB
10k
4k
250
80
8dB
or
headphone socket
or
headphone socket
or
headphone socket
PLAY deck B
PLAY deck A
PLAY deck B
figure. 2
f(Hz)
level(dB)
6dB
10k
4k
250
100
8dB
(10dB HSD)
8dB
(10dB HSD)
adj. ECO MTF DD AS, 110399
11
12
or
11
12
11
12
or
11
12
Recording
mV-meter
5701
RECORDED
CASSETTE
LEFT RIGHT
PLAY
mV-meter check only limits see fig.2
FERRO
FERRO
RECORDED
CASSETTE
LEFT RIGHT
PLAY
THD-meter check only
≤
5%
PRE-ADJUST
BIAS
Input signal: 3mV
100Hz, 250Hz, 1kHz,
10kHz
via or
CHECK
OVERALL
FREQUENCY RESPONSE
CHECK
DISTORTION
Input signal: 300mV
1kHz
via or
Remark: If high frequencies are not within lower limit, decrease bias and re-measure.
If distortion is too high increase bias and re-measure.
14Vrms
(40Vpp)
RECORD
RECORD
RECORD
FERRO
15
or
11
12
or
11
12
13
14
13
14
TAPE ADJUSTMENTS & MEASUREMENTS