5-7
1-4.
LCD SYSTEM ADJUSTMENT
1. D RANGE adjustment (PK-46 board)
(See original service manual page 5-20.)
: Changed point
This adjustment sets correctly the D range of LCD driver.
If disordered, LCD screen will blur or white blur.
Mode
Playback
Signal
Alignment disk: Stair-step signal of 10
steps
Measurement point
CN802
9
pin (VG)
External trigger: CN802
7
pin (HSY)
Measuring equipment
Oscilloscope
Adjustment page
F
Adjustment address
38
Specification value
A=3.99 ± 0.05 Vp-p (SHARP)
A=2.98 ± 0.05 Vp-p (CASIO)
Adjustment procedure:
1)
Set data: 01 to page: 0, address: 01.
2)
Change the data on page: F, address: 38 so that the voltage (A)
between pedestal of inverted waveform and pedestal of
noninverted waveform satisfies the specification value.
3)
Press the PAUSE button on the adjustment remote commander.
Processing after adjustment finished:
1)
Set data: 00 to page: 0, address: 01.
2. BRIGHT adjustment (PK-46 board)
This adjustment sets correctly the VIDEO signal level that drives
the LCD. If disordered, LCD screen will not be sharp, or will white
blur or black blur.
(See original service manual page 5-20.)
: Changed point
Mode
Playback
Signal
Alignment disk: Stair-step signal of 10
steps
Measurement point
CN802
9
pin (VG)
External trigger: CN802
7
pin (HSY)
Measuring equipment
Oscilloscope
Adjustment page
F
Adjustment address
30
Specification value
A=1.78 ± 0.05 Vp-p (SHARP)
A=1.34 ± 0.05 Vp-p (CASIO)
Adjustment procedure:
1)
Set data: 01 to page: 0, address: 01.
2)
Set data: 08 to page: 3, address: 18, and press the PAUSE button
on the adjustment remote commander.
3)
Change the data on page: F, address: 30 so that the voltage (A)
satisfies the specification value. (Confirm that the data at
address: 30 is more than “41”, and less than “BF”.)
4)
Press the PAUSE button on the adjustment remote commander.
Processing after adjustment finished:
1)
Set data: 00 to page: 3, address: 18, and press the PAUSE button
on the adjustment remote commander.
2)
Set data: 00 to page: 0, address: 01.
0 IRE
0 IRE
A
2H
A: Pedestal level difference between 1H period and
previous 1H period.
Fig. 5-1-5
Fig. 5-1-6
0 IRE
A
2H
