Sanyo CR21KX2, Service Manual

Page: 14 / 30

MAIN BOARD
-14-
Service Adjustments
VOL. UP VOL. DOWN MENU
CH UP
CH DOWN
IC8
C
(SOLDE
VR631 +B ADJ.
IC802
MEMORY
RC PRE-AMP.
TP-B
Following adjustments are not required to readjust when replacing the memory IC.
(1) Connect DC meter to TP-B and the ground.
(2) Tune the receiver to an active channel and synchro-
nized picture. Select NATURAL picture mode by press-
ing the
PICTURE MODE button on the remote control.
(3) Adjust B-voltage to be 130 ± 1V DC by using VR631.
B-VOLTAGE SUPPLY CHECKING
(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
B-Voltage Supply Adjustment
T471
FBT
Q432
HORIZ.
OUT
B
C
E
C436
DRIVE
TRANS.
Focus Adjustment
(1) Receive the monochrome circular pattern.
(2) Set the brightness and contrast to maximum.
(3) If the picture is too wide, remove
“C436” on the main
unit.
HORIZ. WIDTH ADJUSTMENT
T471
FBT
Q432
HORIZ.
OUT
B
C
E
C436
Horizontal Width Adjustment
MAIN BOARD
(1) Receive the monochrome circular pattern.
(2) Set the brightness and contrast to maximum.
(3) Adjust the vertical centre of the picture with SW501.
VERTICAL CENTRE
Vertical centre
SW501
V- CENTER
T
IC501
VERT.
OUT
T611
CONVERTER
TRANS.
IC201
IF/VIDEO/
CHROMA
Vertical Cerntre Adjustment
Note: +B (+130V) Voltage Check and Grayscale Adjustment
must be completed before attempting High Voltage Check.
(1) Connect high voltage voltmeter negative lead to
ground, and c lead to anode of picture tube.
(2) Tune receiver to an active channel and confirm TV is
operating properly.
(3) Maximize the beam current by adjusting the contrast
and brightness controls to maximum. Confirm high
voltage is within 24.0 KV and 26.0 KV at maximum
beam current.
(4) Eliminate the beam current by adjusting the contrast
and brightness controls to minimum. Confirm high
voltage does not exceed 27.5 KV at zero beam current.
If reading is not within range, check horizontal circuit.
No high-voltage adjustment is provided on this chassis.
HIGH VOLTAGE CHECK