Adjustment Of Horizontal Delay Sync Pulse; Adjustment Of Horizontal Oscillation Frequency - Sony Trinitron Multiscan CPD-1302 Service Manual

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3-3 ADJUSTMENT OF HORIZONTAL DELAY
SYNC PULSE
1. Signal
H: 15.734 kHz
V:
60 Hz
2. Measure the BA board IC20S pin 13 pulse
waveform and adjust pulse width value as
shown below.
(1)
Turn HP BIAS VR (RV292) fully clock-
wise.
(2) Adjust pulse width to 6 Jlsec ± 0.2 Jlsec
with HP SLOPE VR (RV291).
(3) Adjust pulse width to 4 Jlsec ± 0.2 Jlsec
while turning
HP
BIAS VR (RV292)
counterclockwise.
(4) Adjust pulse width to SJlsec ± 0.2 Jlsec
with
HP
SLOPE VR (RV29l).
T
3. Signal
H: 30.12 kHz
V: 60Hz
T"" 5
jl.SeC
±O.2
fJ.SI1C
4. Confirm that BA board IC20S pin 13 pulse
width
is
3Jlsec ± 0.2 Jlsec at this time.
3-4 ADJUSTMENT OF HORIZONTAL OSCILL-
ATION FREQUENCY
1. Signal
H: 15.734 kHz
V: 60 Hz
H: 21.8 kHz
V: 60 Hz
H: 30.12 kHz
V: 60 Hz
2. Mount a 10Jl/16V chemical capacitor between
BA board IC30 1 pin 1 and C307 negative side
pin (GND).
3. Connect a frequency counter to IC40S pin 10.
4. Set H. FREQ (2) VR (RV40l) to mechanical
center.
5. Adjust H.FREQ
(1)
VR (RV402) so that the
frequency counter reading is 30.12 kHz ±300 Hz
for the input signal (30.12 kHz).
6. Adjust H. FREQ (2) VR (RV401) so that the
frequency counter reading is 21.8 kHz ±300 Hz
for the input signal (21.8 kHz).
7. Adjust H. FREQ (2) VR (RV40l) so that the
frequency counter reading is 15.734 kHz
±blOO Hz for the input signal (15.734 kHz).
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CPD-1302
8. With 30.12 kHz input signal again, adjust H.
FREQ (1) VR (RV402) so that the frequency
counter reading
is
30.12 kHz ±300 Hz.
9. Repeat the above adjustments so that the fre-
quency counter readings are as specified above.
Then remove the chemical capacitor mounted
in step 2.
BA BOARD
o
RV401
o
RV402
IC30t
o
~I:t
C307
10/16V
RV291
0 0
RV292
D'C205