ADJUSTSMENT PROCEDURE
,
See page
26
for j i g
Standard Adjustment Conditions
1) Power source voltage:JC-1531VMA-2 AC120V6OHz/JC-1531VMB-2,R-~,
B-2(EE) AC220V50
1.
1)
2)
3)
4)
5)
2) Aging :Ad_iust after leaving
3) Signal:
Video
Synchronizing
:
Deflection frequency
:
Analog 0.7Vp-p 75Q terminal positive polarity
Analog sync on green
Video
: 0.7Vp-p
Synchronizing
: 0.
3Vp-p
TTL
level Negative/positive polarity
Separate/composite
H 27kHz~62kHz
V 55Hz~90Hz
P r e - A d j u s t m e n t o f M A I N P W B
power on for a minimum twenty minutes.
NOTE: The following 5 steps are to be performed only when
the MAIN
PWB is
replaced.
VR Settings
VR501 H HOLD 1
:
Fully clockwise
VR502 H HOLD 2
:
Fully clockwise
VR503 H SIZE
:
Fully counterclockwise
VR431 PARALLEL0 ADJ: Mechanical center
Heater Voltage Adjustment
a) Receive character "H".
Signal 9 (1024X768(70))
b) Supply 24V to the MAIN PWB.
c) Adjust VR551 so that the voltage across HC and @ is 6.1V ±O.O5V.
H V Adjustment
Signal 11 (42.5kHz)
a)
b)
c)
d)
e)
f)
g)
h)
Connect CNP-HV
Turn VR505(H V ADJ VR) fully counterclockwise.
Receive crosshatched pattern and adjust VR501(H HOLD 1) and VR502
(H HOLD 2) to sychronize the screen.
Brightness control: Fully counterclockwise
Contrast control
:
Fully counterclockwise
Receive an all-black signal.
Confirm that the CRT is at cut-off.
Adjust VR505 so that high voltage is 24kV ±O.lkV.
Seal VR505 by using a cap(74102801) and silicon glue.
Reference Voltage Adjustmant
a) Supply 24V to the MAIN PWB.
b) Adjust VR851(0.96V ADJ) so that the voltage across TP42 and GND on
Adjustment-PWB (TP-B @ and
0.96V ±O.OlV.
OV Adjust
Signal 10
a) Receive signal lO(all "H").
b) Adjust VR852(5.14 ADJ) so that the voltage across TP-A and is OV
±0.05V.
17
Summary of Contents for MultiSync 4FGe
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