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2. VCO Adjustment (PD-107 board)
Set the VCO freerun frequency. If deviated, the LCD screen will be
blurred.
Mode
VTR stop
Signal
No signal
Pin 2 of CN5501 (VCO VOLTAGE)
Measurement point
of PD-107 board
Measuring instrument
Oscilloscope
Adjustment page
E
Adjustment address
D6
Specified value
A = 1.70 ± 0.02V
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 3, address: 01, set data: 55, and press the PAUSE
button of the adjusting remote commander.
3) Select page: 2, address: 7D, and set data: 00.
4) Select page: E, address: D6, change the data and set the VCO
VOLTAGE (A) to the specified value.
5) Press the PAUSE button of the adjusting remote commander.
6) Select page: E, address: D6, and read the data (D
7) Calculate the adjustment data (hexadecimal) from the follow-
ing equations (hexadecimal calculation), and input to address:
BF. (Refer to Table 5-1-2. Hexadecimal-Decimal conversion
Table.)
When D
55
D6
D
= D
- 55
BF
D6
When D
< 55
D6
D
= 00
BF
Note2 : After setting data, be sure to press the PAUSE button.
8) Select page: 3, address: 01, set data: 00, and press the PAUSE
button of the adjusting remote commander.
9) Select page: 0, address: 01, and set data: 00.
H
A
Fig. 5-1-22.
3. D range Adjustment (PD-107 board)
Set the D range of the RGB decoder used to drive the LCD to the
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
Mode
Signal
Measurement point
Measuring instrument
Adjustment page
Adjustment address
Specified value
Note1 : Press the DISPLAY button and erase the screen indictors
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
).
D6
2) Select page: 3, address: 01, set data: 55, and press the PAUSE
button of the adjusting remote commander.
3) Select page: 2, address: 7D, and set data: 00.
4) Select page: E, address: D4, change the data and set the voltage
(A) between the reversed waveform pedestal and non-reversed
waveform pedestal to the specified value.
5) Press the PAUSE button of the adjusting remote commander.
6) Select page: 3, address: 01, set data: 00, and press the PAUSE
button of the adjusting remote commander.
7) Select page: 0, address: 01, and set data: 00.
GND level
(0 Vdc)
5-31
VTR stop
No signal
Pin 3 of CN5501 (VG) of PD-107
board
External trigger : Pin 4 of CN5501
(PANEL COM)
Oscilloscope
E
D4
A = 2.98 ± 0.05V
on the LCD screen.
2H
Fig. 5-1-23.
A
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