JVC JX-W9(E) Service Manual page 15

JX-W9
Symptom
Check point
Normal voltage and waveforms
Adjusting point and defect
18. All wipe patterns
are abnormal
Mode: Wipe
Manaul/Auto:
Manual
16 (No. 70053)
ma
pattern is not
possible
IC2 pin6
Emitter of 045
Emitter of 084
EO pattern is not
possible
Emitter of Q49
Emitter of 042
65) | Emitter of 084
vzovt | Lf
V SYNC
Adjust VR56 so that the duty
| ratio becomes 50 %.
Approx. apy lo NZ Ne
Adjust linearity with VR57.
Adjust level with VR58.
Approx.
44V
H SYNC
Adjust linearity with VR61.
@ Check the vertical sync signal from
connector CN18-2 to {C2 pin 5.
® Check the vicinity of I1C2.
: @Check 6).
@ Check voltages and waveforms in the
vicinity of O45.
: @Check @.
@ Check IC3 in/out pins 1, 2 and {C4
in/out pins 8, 9.
According to 'Switching Truth Tabie'',
check gate No. 51 (pin 13), No. 53
(pin 6}.
@ Check voltages and waveforms of
044, 084. '
eCheck @.
@ Check voltages and waveforms in the
vicinity of Q48, O49.
: @Check @.
Approx.
1.6V
Adjust linearity with VR52,
Adjust balance with VR53.
Adjust level with VR54.
1C8 pin 12
{uPC319 C)
tot 1C6 pin 4
(TC4001BP)
iC8 pin 7
(uPC319 C)
68) | Select [J] pattern
Select ™ pattern
1H-SYNC
i
wav] | LI
I
Variable with Manual knob
Check @.
@ Check voltages and waveforms in the
vicinity of O41, 042.
: @Check @.
@ Check 1C3 in/out pins 11, 10, and
1C4 pins 8, 9.
e According to "Switching Truth Table'
check gate No. 52 (pin 12), No, 53
(pin 6).
® Check voltages and waveforms of
043, 044, 084.
@ Check the wipe control voltage of
connector CN22 pin 2.
*DC20V-109V
eNO: Check @.
e Check voltages and waveforms in the
vicinity of 1C8.
: @Check 6).
I
Same waveform as above.
@ Check voltage from connector CN42-1
or CN19-3 to IC6 pin 5.
*L (0.7 V) isO.K.
NO: Check H gate according to
"Switching Truth Table'.
: @Check "Wipe Gate Logic Diagram".
1V-SYNC
weyE Pt
|.
Variable with Manual knob
@ Check voltage from connector CN42-2
or CN19-2 to C6 pin 9.
*DpC1.2V7108V
@NO: Check @.
@ Check voltages and waveforms in the
vicinity of 1C8.
: @Check @.