Service Adjustments
MAIN BOARD
Pincushion Adjustment
B-Voltage Supply Adjustment
(1) Receive PAL cross hatch pattern.
(2) Select ”DYNAMIC” picture mode with the remote
control VSM (Video Status Memory) button.
(3) Adjust the focus control VR(H) for the best focus
vertical line on the screen center.
(4) Adjust the focus control VR(V) for the best focus
horizontal line on the top of the screen.
(5) Readjust the focus of the items (3) and (4).
FOCUS ADJUSTMENT
(1) Connect DC meter to C641(+ side) and the ground.
(2) Tune the receiver to an active channel and
synchronized picture. Select DYNAMIC picture mode by
pressing the VSM (Video Status Memory) button on
the remote control .
(3) Adjust B-voltage to be 140 ± 0.5 volt DC by using
VR631.
B-VOLTAGE SUPPLY ADJUSTMENT
(1) Receive the monochrome circular pattern.
(2) Set the brightness and contrast to maximum.
(3) Connect a high voltage probe to anode lead of the
picture tube.
(4) The high voltage must be 30.5KV ± 1KV and less than
33KV at 0 beam current (Brightness and contrast mini-
mum settings).
NOTE:
If the picture tube is replaced, check the high voltage.
HIGH VOLTAGE CHECK
(1) Receive the cross hatch pattern signal.
(2) Adjust so that the vertical lines to become straight by
using VR463.
PINCUSHION ADJUSTMENT