-13-
Q432
HORIZ. OUT
B
C
E
T431
H-DRIVE
TRANS.
Q613
POWER OUT
B
C
E
T401
F.B.T.
T611
CONVERTER
TRANS.
Service Adjustments
MAIN BOARD
Following adjustments are not required to readjust when replacing the memory IC.
(1) Receive the monochrome circular pattern.
(2) Set the brightness and contrast to maximum.
(3) If the picture is too wide, or narrow, cut or short the “AJ1” on
the main unit. When AJ1 is shorted, the horizontal width
increase. When AJ1 is cut, the horizontal width decrease.
Important note: When AJ1 is cut, in order to prevent a spark,
leave the opening between cutting portions
5mm or more.
HORIZ. WIDTH AND HIGH VOLTAGE CHECK
(1) Receive the monochrome circular pattern.
(2) Set the brightness to normal and contrast to maximum.
(3) Adjust the focus control on the F.B.T. for the best focus on the
screen centre.
FOCUS ADJUSTMENT
F.B.T.
(4) Connect a high voltage probe to anode lead of the picture
tube.
(5) The high voltage must be 14”=21KV ± 1KV / 20”=25KV ±
1KV and less than 14”=25KV ± 1KV / 20”=27.5KV
at 0 beam current (Brightness and contrast minimum set-
ting).
Note: If the picture tube is replaced, check the high voltage. The
horiz. width adjustment affects the high voltage.
Therefore, re-check the high voltage.
more than 5mm
AJ1
+B POWER SUPPLY ADJUSTMENT
VR631
TP-B
HORIZONTAL WIDTH
ADJUSTMENT
AJ1
FOCUS ADJUSTMENT
FOCUS VR
(Upper side)
(1) Connect DC meter to “TP-B” (R638) and the ground. Set the
+B adjustment control (VR631) to mid-range.
(2) Set the brightness to normal and contrast to maximum. Tune
the receiver to an active channel and synchronized picture.
(3) B adjustment control (VR631) for 130 ± 1,0 volt DC.
+B POWER SUPPLY ADJUSTMENT
