Hitachi 36SDX88B Service Manual page 47

2.3 Deflection Circuit Adjustment
2.3.1 Chopper Voltage Adjustment
Preparation for adjustment Adjustment procedure
(1) Connect deflection PWB 1) Set the Voltage meter to both side
assembly to the standard of CP20.
set.
Notes
(2) Set AC voltage to 120 + (2) Leave the set heat-run for more than
2v, 60Hz 30 sec. over.
(3) Receive Cross-Hatch and (3) Adjust Chopper Voltage as shown SVGA DJ-V
VGA
Circle Pattern with White below. (RPE3) (RPA2) (RP09)
background of VGA3 in
(1) VGA of group 1.
group 1.
4
7 -
r
(Horizontal Frequency:
(2) DTV ready of group 3.
00 0
315kHz)
+
(3) SVGA of group 1.
{I ) VGA of group 1
Turn the RP09 VR so that Chopper
Voltage value is 112*OSV
Chopper P.W.B
(Parts side View)
(2) DTV ready of group 3
Turn the RPA2 VR so that Chopper
Voltage value is 124+OSV
(3) SVGA of group I.
Set the value of adjustmen
code D15, H size, to the
center, before starting
adjustment shown at left.
Turn the RPE3 VR so that Chopper
Voltage value is 140*0.5V
(4) Receive White Signal in Mark base and ditch of VR with black
Re-marking after re-
DTV Ready of group 3 ink after adjusting 1 to 3.
adjustment should be as
(Horizontal Frequency:
follows.
33.75kHz)
The 2nd time:Red
or Receive White Signal in
The 3rd time:Blue or Greer
PC mode
The 4th time:Change VR
(Horizontal Frequency:
33.75kHz)
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