Tape Adjustments And Measurements; Tuner Adjustment Table - Philips FWC170 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
SBC420 PLAY deck A
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
FERRO RECORD
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
f(Hz)
80 250 4k 10k
figure. 1
6-2
MEASURE ADJUST
READ ON
with
ON
or
11 12
frequency
3150Hz ±1%
3758
LEFT RIGHT
counter
or
headphone socket
or
11 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 & left=right
oscilloscope
or
headphone socket
or
11 12
mV-meter Check limits see fig.1
LEFT RIGHT
15 14V rms
5701
mV-meter
(40V pp )
or
11 12
mV-meter check only limits see fig.2
LEFT RIGHT
11 or 12
≤5%
THD-meter check only
LEFT RIGHT
adj. ECO MTF DD AS, 110399
level(dB)
8dB 6dB 8dB
(10dB HSD) (10dB HSD)
f(Hz)
100 250 4k 10k
figure. 2

TUNER ADJUSTMENT TABLE

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