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
Pre-Adjustment
of MAIN PWB
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
@I>
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
@I
and
@
is OV
±0.05V.
17
To Next Page
Loading...
Need help?
General