(No.YA068)1-27
4.10.2 B1 VOLTAGE
4.10.3 FOCUS
Item
Measuring
instrument
Test points
Adjustment part
Description
B1 VOLTAGE
Signal
generator
DC voltmeter
TP-B1
TP-E(GND)
(E2)
[MAIN PWB]
B1 ADJ VR
(VR1901)
[MAIN PWB]
SCREEN VR
[in FBT]
(1) Receive a whole black signal.
(2) Connect a DC voltmeter to TP-B1 and TP-E( ).
(3) Adjust the B1 ADJ VR(VR1901) so that B1 voltage is
at 53V±0.2V.
(4) If B1 voltage is out of range, adjust it with B1 ADJ
VR(VR1901).
Item
Measuring
instrument
Test points
Adjustment part
Description
FOCUS
Signal
generator
FOCUS 1 VR
FOCUS 2 VR
[In FBT]
(1) Input the crosshatch pattern signal.
(2) Adjust the FOCUS 1 VR (Vertical line) and FOCUS
2 VR (Horizontal line) for optimum focus where moi-
re is not apparent.
(3) Darken the picture and adjust the focus by turning
counter-clockwise from the position where focus is
poor.
(4) Alternately repeat the above steps to obtain the
optimum position.