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JX-W9
6. Troubleshooting
Notes:
1. Input signal:
Video: Full-field color bar (white 100 %), 1.0 Vp-p
Audio: 1 kHz, -10 dBV sine wave
2. NO:
When normal voltage and waveforms are not present
YES: Normal voltages, etc.
3. Refer to the "ICs and Adjusting Points Locations" on page 29.
4. Before starting repairs, check each adjustment related to the timing pulse in "Adjustment Procedure" (on page 19.)
5. For adjustment, refer to the 'Adjustment Procedures''.
Check point
Normal voltage and waveforms
AC 15.0 V
Adjusting point and defect
NO:
©Power cord or power transformer is
shorted,
@ Power switch or power transformer
connector, etc. is defective.
: eCheck @.
1. No picture nor
sound,
Secondary side of
power transformer
© 1C17 or D20 is defective.
@ Lead wire or connector, etc. of IC17 is
defective.
: ®Check @.
DC 12.0 V (11.5 — 12.5 V)
Power supply of main circuit
Power line of each
DC115-125V
section
¥ C232
S
®
Hot sides of R1, R8
(75 ohms)
NO:
® Video input terminals are defective.
Check the voltage and waveforms in the
vicinity of Q1 or G2.
2. No output is
present at any
output terminals.
Check IN/OUT of
. No output is
Same waveform as above.
NO:
¢1!C27 is defective.
OUT terminals.
Or their levels
are abnormal.
(With BYPASS
on and off)
pin 4 pin3
pind
pin 13 > pin 12
: @ Check ©.
pin5
>
pini3
(Connected to CN25)
iC16
pin 1
(AN608)
eCheck 1C11 input pins (pins 11, 10),
output pins (pins 1, 2) and gate pins
(pins 12, 13).
© Check each voltage and waveform at
Q65, 1C16, O66 and O67.
@ Check 1C12 input pin (pin 10), output
pin (pin 11) and gate pin (pin 12).
Adjust VR35.
NO:
eCheck Q13.
e Connector CN17-1 or lead wire is .
Emitter of Q55
. No output is
present at video
jacks on MONI-
defective.
TOR and REC
@ Check the voltage waveform of Q55.
OUT terminals,
: ®Check @.
Or their levels
are abnormal.
(Only when
BYPASS off}
@ Check !C9 in/out pins 1, 2 and gate
pin 13.
: eCheck @.
0.98 V
Adjust VR33
Same waveform as (8) when
BYPASS is set to OFF.
1C11 pins
1,2 — same as @).
Base of Q65
#1C11,1C10 is defective.
e Connector CN29-2 is defective, or check
peripheral components, etc.
(Connected to CN29)
10 (No. 70053)
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