Tuner Adjustment Table - Philips FW-C155/22 Service Manual

TAPE ADJUSTMENTS & MEASUREMENTS
TEST RECORDER
CASSETTE
MODE
General
SBC420
ADJUST
PLAY
(4822 397 30071)
MOTOR SPEED
deck A or B
3150Hz
SBC420
CHECK
PLAY
WOW & FLUTTER (4822 397 30071)
deck A or B
3150Hz
PLAY deck A
SBC420
ADJUST
(4822 397 30071)
AZIMUTH
10kHz
PLAY deck B
Playback
PLAY deck A
CHECK
SBC420
PLAYBACK
(4822 397 30071)
FREQUENCY RESPONSE
PLAY deck B
Recording
PRE-ADJUST
FERRO RECORD
BIAS
CHECK
OVERALL
RECORD
FERRO
FREQUENCY RESPONSE
Input signal: 3mV
100Hz, 250Hz, 1kHz,
10kHz
RECORDED
PLAY
CASSETTE
via 13 or
14
CHECK
FERRO RECORD
DISTORTION
Input signal: 300mV
1kHz
RECORDED
via 13 or 14
PLAY
CASSETTE
Remark: If high frequencies are not within lower limit, decrease bias and re-measure.
If distortion is too high increase bias and re-measure.
level(dB)
8dB 6dB 8dB
250
80 4k 10k
figure. 1
6-2
ADJUST
MEASURE
READ ON
with
ON
or
11 12
frequency
3150Hz ±1%
3758
LEFT RIGHT
counter
or
headphone socket
11 or 12 ≤0.4 % DIN or
W&F-meter check only
LEFT RIGHT
≤0.35 % CCIR
or
headphone socket
11 12
mV-meter
max. output level
left hand screw
or
LEFT RIGHT
oscilloscope
or
headphone socket
or
11 12
mV-meter Check limits see fig.1
LEFT RIGHT
15
5701
mV-meter
or
11 12
mV-meter check only limits see fig.2
LEFT RIGHT
11 or 12
THD-meter check only
LEFT RIGHT
level(dB)
8dB 6dB 8dB
(10dB HSD) (10dB HSD)
f(Hz)
250
100 4k 10k
figure. 2

TUNER ADJUSTMENT TABLE

Waverange
to
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
& left=right 531 - 1602kHz
FM IF
FM
FM RF
FM
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
VCO
14V rms
(40V pp )
FM
AM IF
MW
AM AFC
MW
≤5%
3)
AM RF
4)
MW
FM/MW/LW- and FM/MW-version
( 9kHz grid)
531 - 1602kHz
adj. ECO MTF DD AS, 110399
LW
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
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)
f(Hz)
3)
For AM RF adjustments the original frame antenna has to be used !
Repeat
6-2
( ECO6 FM/MW- and FM/MW/LW - versions with AM-frame aerial )
Input frequency Input Tuned to Adjust
108MHz
87.5MHz
check
(65.81MHz)
1700kHz
530kHz check
1602kHz
531kHz check
279kHz
153kHz check
1602kHz
531kHz check
IC 7101
21
10.7MHz, 45mV
D
continuous wave shortcircuit
2141
to block AFC
A
108MHz 108MHz
mod=1kHz
87.5MHz 87.5MHz
∆f=±22.5kHz
(65.81MHz) (65.81MHz)
98MHz, 1mV
A
98MHz
continuous wave
IC 7101
36
100nF
C
450kHz ∆f=±10kHz
IC 7101
40
V = 0.5mV
RF 100nF
connect pin 6 of
(as low as
see
IC 7101 (AM Osc.) remark 2)
possible)
with 3.3kΩ to Vcc
C
continuous wave
V = 2mV
RF
1494kHz 1494kHz
B
558kHz
558kHz
198kHz 198kHz
1500kHz ∆f = ±30kHz 1500kHz
V as low as
RF
560kHz 560kHz
possible
2)
RC network serves for damping the IF-filter while adjusting the other one.
4)
MW has to be aligned before LW.
Output Scope/Voltmeter
8V ±0.2V
5130
4.3V ±0.5V
(1.2V ±0.5V)
8V ±0.2V
5123
1.1V ±0.4V
6.9V ±0.2V
5123
1
1.1V ±0.4V
8V ±0.2V
5122
1.1V ±0.4V
8V ±0.2V
5123
1.1V ±0.4V
0 ± 3 mV DC
2
5119
2155
4
MAX
5131
152kHz ±1kHz 1)
3
3142
5111
5
5112
f
o
symmetric
5114 0 ± 2 mV DC
2
2106
5102
5
5103
2106
f
o
symmetric
5102
ECO6, Sys + PA with frame aerial, 070799