Tuner Adjustment Table - Philips MC-V65 Service Manual

TUNER ADJUSTMENT TABLE

( ECO6 FM/MW- and FM/MW/LW - versions with AM-frame aerial )
Waverange Input frequency Input
VARICAP ALIGNMENT
FM
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
FM/MW-version, 9kHz grid
531 - 1602kHz
LW
153 - 279kHz
MW
FM/MW/LW- version, 9kHz grid
531 - 1602kHz
FM IF
10.7MHz, 45mV
D
FM
continuous wave
FM RF
FM
A
108MHz
87.5 - 108MHz
mod=1kHz
(65.81 - 74, 87.5 - 108MHz)
87.5MHz
(65.81MHz)
f=–22.5kHz
VCO
98MHz, 1mV
A
FM
continuous wave
AM IF
C
450kHz
MW f=–10kHz
V = 0.5mV
RF
connect pin 6 of
(as low as
IC 7101 (AM Osc.)
possible)
with 3.3k‰ to Vcc
AM AFC
C
MW
continuous wave
V = 2mV
RF
3)
AM RF
4)
MW
1494kHz
B
FM/MW/LW- and FM/MW-version
( 9kHz grid)
558kHz
531 - 1602kHz
LW 198kHz
MW
1500kHz
f = –30kHz
FM/AM-version, 10kHz grid
V as low as
RF
560kHz
530 - 1700kHz
possible
Use Service Testprogram. By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically.
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)
3)
11 - 1
Tuned to Adjust Output Scope/Voltmeter
108MHz 5130 8V –0.2V
87.5MHz 4.3V –0.5V
check
(65.81MHz) (1.2V –0.5V)
1700kHz 5123 8V –0.2V
530kHz check 1.1V –0.4V
1602kHz 5123 6.9V –0.2V
1
531kHz check 1.1V –0.4V
279kHz 5122 8V –0.2V
153kHz check 1.1V –0.4V
1602kHz 5123 8V –0.2V
531kHz check 1.1V –0.4V
IC 7101
21
2
5119 0 – 3 mV DC
shortcircuit
2141
to block AFC
108MHz 2155
4
87.5MHz
5131
(65.81MHz)
3
98MHz 3142 152kHz –1kHz
IC 7101
36
100nF
5111
5
IC 7101
40
100nF 5112
see
remark 2) symmetric
5114
2
0 – 2 mV DC
1494kHz 2106
5102
558kHz
5
198kHz 5103
1500kHz 2106
symmetric
5102
560kHz
ECO6, Sys + PA with frame aerial, 070799
2)
RC network serves for damping the IF-filter while adjusting the other one.
4)
TAPE ADJUSTMENT & CHECK TABLE
CASSETTE
MOTOR SPEED
WOW & FLUTTER
ADJUST AZIMUTH
PLAYBACK LEVEL
& FREQ. RESPONSE
CHECK RECORD/PLAYBACK FREQUENCY AND DISTORTION
Inject 3mV signals
100Hz, 250Hz, 1kHz,
10kHz, 12.5kHz
via or
3 4
RECORDED
CASSETTE
Inject 1kHz 8.85mV
MAX
via or
3 4
RECORDED
CASSETTE
1)
SBC419A : 4822 397 30069
SBC420 : 4822 397 30071
level(dB)
f
o
8dB
80 250
f
o
11 - 1
TEST MEASURE
RECORDER
READ ON
ON
MODE
SBC420 frequency
PLAY
counter
3150Hz
SBC420
W&F-meter
PLAY
3150Hz
or
1 2
PLAY FWD
SBC420
LEFT RIGHT
mV-meter
10kHz
PLAY REV ^
SBC420
mV-meter
PLAY
315Hz
SBC419A
RECORD
or
SBC420
or
1 2
PLAY mV-meter
LEFT RIGHT
SBC419A
or
RECORD
SBC420
or
1 2
PLAY THD-meter
LEFT RIGHT
^ For Auto-reverse version only
* If high frequencies are not within limits, decrease bias and re-measure.
If distortion is too high, increase bias and re-meaure
level(dB)
6dB 8dB 8dB
f(Hz)
100
4k 12.5k
figure. 1
ADJUST
with to
check 3150Hz +/- 2%
check
< 0.4 % DIN
left hand screw
max. output level
& left=right
right hand screw
125mV +/- 3dB
check (see fig.1 for freq.
response)
check limits see fig. 2 *
check < 3% *
6dB 8dB
f(Hz)
250
4k 10k
figure. 2