Service Adjustments - Sanyo CR21KX2 Service Manual

Service Adjustments

Following adjustments are not required to readjust when replacing the memory IC.
B-VOLTAGE SUPPLY CHECKING
(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.
MAIN BOARD
RC PRE-AMP.
B-Voltage Supply Adjustment
FOCUS ADJUSTMENT
(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.
MAIN BOARD
T471
FBT
Focus Adjustment
CH UP CH DOWN VOL. UP VOL. DOWN MENU
IC8
(SOLDE
IC802
MEMORY
VR631 +B ADJ.
TP-B
DRIVE
TRANS.
Q432
B
HORIZ.
OUT
C
E
VERTICAL CENTRE
(1) Receive the monochrome circular pattern.
(2) Set the brightness and contrast to maximum.
(3) Adjust the vertical centre of the picture with SW501.
T611
CONVERTER
TRANS.
C
T
HORIZ. WIDTH 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.
T471
FBT
Horizontal Width Adjustment
HIGH VOLTAGE CHECK
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 connect + 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.
-14-
Vertical centre
IC501
VERT.
OUT
IC201
SW501
IF/VIDEO/
CHROMA
Vertical Cerntre Adjustment
Q432
B
HORIZ.
OUT
C
E