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2. SERVICE ADJUSTMENTS
1. Supply power to the set and measuring instruments and allow to warm up for at least 30 minutes.
NOTE
Be sure to use a non-metallic driver for adjusting there VRs. A metallic driver can cause damage by shorting.
Adjustment tool
1. Digital multi meter
2. Pattern generator
3. Color analyzer
Adjustment mode
Over scan mode
ADJUSTMENT
TIMING
ITEM
PATTERN
PATTERN GENERATOR
CHECK B+
MONOSCOPE PATTERN
VOLTAGE
PATTERN GENERATOR
HOLD DOWN
MONOSCOPE PATTERN
VOLTAGE
SETTING
PATTERN GENERATOR
FOCUS
MONOSCOPE PATTERN
ADJUSTMENT
PATTERN GENERATOR
HORIZONTAL
MONOSCOPE PATTERN
PHASE
ADJUSTMENT
PATTERN GENERATOR
HORIZONTAL
MONOSCOPE PATTERN
SIZE
ADJUSTMENT
PATTERN GENERATOR
VERTICAL
MONOSCOPE PATTERN
LINEARY
ADJUSTMENT
PATTERN GENERATOR
VERTICAL
MONOSCOPE PATTERN
CENTER
ADJUSTMENT
PATTERN GENERATOR
VERTICAL
MONOSCOPE PATTERN
SIZE
ADJUSTMENT
VR
SETTING
LOCATION
VR503
BRIGHT VR and
CONTRAST VR
TO MAX.
FTB FOCUS
BRIGHT VR and
CONTRAST VR
VR
TO 75%.
SHARPNESS
VR TO MAX.
VR401
BRIGHT VR ,
CONTRAST VR
and SHARP-
NESS VR TO
MAX.
BRIGHT VR ,
VR306
CONTRAST VR
and SHARP-
NESS VR TO
MAX.
BRIGHT VR ,
VR302
CONTRAST VR
and SHARP-
NESS VR TO
MAX.
VR303
BRIGHT VR ,
CONTRAST VR
and SHARP-
NESS VR TO
MAX.
BRIGHT VR ,
VR301
CONTRAST VR
and SHARP-
NESS VR TO
MAX.
– 5 –
ADJUSTMENT PROCEDURE
TEST POINT : D910(-)
DIGITAL VOLT METER
VALUE 125.5 ± 0.5 VDC.
TEST POINT : ZD501(-)
DIGITAL VOLT METER
VALUE 8.75 ± 0.1 VDC.
Adjusting FBT Focus VR make focus
resolution of reach over 450TV lines, four
corners must be aiso clear.
Adjusting VR401 horizontal phase make
right and left of picture to <=1%.
Adjusting VR306 make signal side of
picture of scale at 1.5 ~ 2.2 position.
Adjusting vertical linear control VR302 for
equal spacing of lines between center
extreme of scan [(Max-Min)/Aver-
age]<=10%.
Adjusting vertical center control VR303 to
<=1%.
Adjusting vertical size control VR301
make signal side of scale is 1.0 ~ 1.5
position.
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