Sub Brightness Adjustment - Hitachi C43-FD5000 Service Manual

SERVICE ADJUSTMENTS

2.18 SUB BRIGHTNESS ADJUSTMENT

Adjustment Preparation
(1) Pre-heat 20 minutes or more before the adjustment.
(2) Receive the color bar signal.
(3) The vertical incident illumination on the screen should be 20 lux or less.
Adjustment Procedure
(1) Go to "Sub Brightness (item No. 44)" in adjustment mode by using JIG R/C.
(2) Adjust Sub brightness following the specification as shown below by using JIG. R/C.
(3) Press [MUTE] key on R/C to write the data into ROM.
REMARKS
Observe the TV SET screen directly by eye; Do not use a mirror.
Adjustment specification: Within ± 0.3 step
Quality control specification: Within ± 0.5 step
Note: During the SUB-BRIGHTNESS adjustment mode, TV Micron IC changes the CONTRAST and the COLOR
controls to Minimum, but the other controls are not changed automatically.
Make sure that the other controls are set center.
CHASSIS
DP3M
Note: Actual procedure, set A1 portion to black (same level as A0 portion) and reduce 6 steps to set A1 portion
slightly brighter.
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9
Sink to black
A0
A10
Slightly for black
A1
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