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Symptom
a
Check point
Normal voltage and waveforms
—
:
JX-W9
Adjusting point and defect
16. Video fade-out
is abnorma!
Fade: Video
Mode: Wipe
[C59 pin 7
{uPC358
DC1.3V~10.7V
@ "Manual" knob operation
e "Auto" in and out operation
(1C57 pin 1 is 2.0 V ~ 10.6 V)
Cc)
@ Check [C55 in/out pins 8 and 9
(for Manual}, pins 10, 11 (for Auto).
@ Check voitage of each pin of (C59,
@ Check connector CN8-5, 6, 7 and
(manual knob} lead wires.
: @Check @.
@|
REC OUT Video
terminal
10 mV or less
Black fade
White fade
10 mV or less
ma
Adjust VR34 so that the signal
level is minimum.
© Check voltages and waveforms in the
vicinity of [C15.
®@ Check output voltage of IC57 pin 1.
@ Check connector CN29-1 and lead wires.
@ Adjust black fade level with VR31.
@ Adjust white fade level with VR32.
17.|In Wipe opera-
tions, some
patterns mal-
function
Mode: Wipe
Manual/ Auto:
Manual
* Final check
should be done
with monitor
TV using
Crosshatch
pattern, etc.
Refer to
""Adiustment
Procedure".
* Final check
should be done
with monitor
TV using
Crosshatch
pattern, etc.
Refer to
"Adjustment
Procedure',
®
or
pattern is
possible
Emitter o
Emitter o
mS oor
pattern is
possible
[
oan
not
Approx.
6.7 V
eae)
| Adjust linearity with VR59
ie.
@ Check horizontal sync signal from
connector CN 18-3 to Q46 base.
: eCheck @.
f QS1
Won:
19V
[HON:
1.9V
ea)
el
Adjust level with VR60,
Adjust balance between both
waves with VR62.
Approx. | eg
eae
5.5V
V SYNC
not
NO:
YES:
@ Check IC5 in/out pins 10, 11 pins 1,2
and pins 3, 4.
® According to the "Switching Truth
Table", check gate No. 55 (pin 12), No.
57 (pin 13) and No. 58 (pin 5).
@ Check voltages and waveforms of Q50.
@ Check the vertical sync signal from
connector CN18-2 to Q39 base.
eCheck @.
|
| Emitter of Q40
®
Emitter of Q84
'@| =O
pattern is not
possible
{C2 pin 10
(TC4538BP}
@ | Emitter of Q52
Emitter of Q51
| Adjust tinearity with VR51.
POON:
vl
|,
fad ON:
VY sy
Adjust fevel with VR50.
Adjust balance between both
waves with VR55.
12.0 "ae ae me
H SYNC
Adjust VR63 so that the duty
ratio becomes 50 %,
NO:
© Check [C3 in/out pins 9,8 and IC4
in/out pins 8,9,
11 and 10.
® According to "Switching Truth Table',
check gate No, 50 (pin 6), No. 53
(pin 6) and No, 54 (pin 12).
®@ Check voltages and waveforms of 044,
® Check the horizontal sync signal from
connector CN18-3 to !C2 pin 12.
Check the vicinity of 1C2.
: ®Check @.
Approx.
3.1V
ia
Adjust the linearity with VR64
@ Check the voltages and waveforms in the
vicinity of Q52.
: @Check @.
Approx.
2.0V
| Os
Adjust VR65 so that the duty
ratio becomes 5 %.
@ Check IC5 in/out pins 8, 9 and 1, 2.
® According to "Switching Truth Table",
check gate No. 57 (pin 13).
® Check vaitages and waveforms of
Q50, 051.
(No, 70053) 15
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