JVC JX-W9(E) Service Manual page 13

JX-W9
11. Level, phase of
background color
is incorrectly ad-
adjusted.
.Colerization
operation is
abnormal.
. Painting
operation is
abnormal
Mode: Effect
Effect: Paint
. B/W operation
is abnormal
Mode: Effect
Effect: BAW
Check point
When NEGATIVE
ON,
Emitter of Q60
Emitter of Q62
Video terminal of
REC OUT
1C37 pin 10
pin 4
(uPC 319 C)
1C37 pin?
pin.12
(uPC319 C)
1C39 pin7
(MB40576)
1C39 pins 3, 4,5
1C41 pin5
Normal voltage and waveforms
0.70 V
Set-up voltage OV
Adjust VR16 ~ 19.
Adjusting point and defect
@ Check ail voltages and waveforms of
1€72, Q36 and 37.
@ Check clamp circuit consisting of 1C42
in/out pins 3, 4 and gate pin 5.
@ Check voltages of 1C42 in/out pins
1, 2, and check gate No. 44 (pin 13)
according to "Switching Truth Table".
: @Check @).
e Same as @).
YL: 167°
G: 241°
R: 104°
B: 347°.
Measure with vectorscope.
Variable by controlling
LEVEL and RANGE VRs
17.73447 MHz
37V 0.2 V
-L-_st == ov
Variable by controlling
the LEVEL VR.
15.DEFOCUS
operation is
abnormal
Mode: Effect
Effect: Defocus
14 (No. 70053)
1CS3 pin 13 ON: 11.5V
OFF: O4V
e Re-adjust the following according to item
in "Adjustment Procedures' (on 10~13
page 21):
VR5 — Phase of background color
VR6, 8 — Carrier balance
VR7 — Set-up
VRQ — R-Y level
VR11 — Level of background color
@ Check item 7.
@ Check voltages and waveforms of Q26
~ 29.
@ Check clamp circuit consisting of C48
in/out pins 3, 4 and gate pin 5.
: @Check that the {C37 pins 9,5 are varied
with the LEVEL and RANGE knobs.
(Variable 3.4 V ~ 5.0 V)
eCheck @ .
® Check voltages and waveforms in the
vicinity of 1C37.
: @ Check gate No, 36 according to
"Switching Truth Table'.
® Check voltages and waveforms in the
vicinity of [C38. '
e 1C38, crystal oscillator X-2 is defective.
®Check 68)
e Check voltages and waveforms in the
vicinity of |C39.
Check @ and @.
Check @.
® According to the "Switching Truth
Table", Check No. 38 gate.
: @Check 1C41 in/out pins 3 and 4.
® According to "Switching Truth
Table', check gate No. 41.
: @Check @.