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If any of the following parts was replaced, execute the “V-COM 
Adjustment” and “Flicker Adjustment” as mentioned below.
• 

Complete AUDIO board

• 

AUDIO board: IC504

• 

Complete VISUAL board

• 

VISUAL board: IC2001

• 

Liquid crystal display panel (LCD1401)

• 

Complete LCD board

PC 
(The one with serial port. The USB-
RS232C conversion is available.)

V-COM adjustment and 
Flicker adjustment

Communication software 
(Hyper Terminal etc.)

Serial cable for RS232C 
(Cross cable)

RS232C-JIG OVERALL ASSY 
(Part No. A-1777-380-A)

Oscilloscope

V-COM adjustment

RS232C-JIG OVERALL ASSY

1-2.  Serial port setting
Please setting it as follows. 

1-3.  Connection with set
Procedure:
1.  Four screws in the back of the set are removed, and the bracket 

back is detached.

2.  The 5pin cable is connected with the second the connector 

from the left.

3.  The switch of RS232C-JIG OVERALL ASSY is “L”.

4.  The communication software is start up.
5.  Turn on the main power of set.
 

The following log is displayed when starting while connected.

xxxxx Visual Ver[**** ] xxxxx
Techwell Mode
Data Read Format : ‘r 005A’+ [Enter]
Data Write Format: ‘w 01C4 03’+ [Enter]

DAC Mode
Data Read Format : ‘dr0’+ [Enter]
Data Write Format: ‘dw1 7D’+ [Enter]

Gerda WB Adjust (TestMode5 only)
Read Drive Value   : ‘grd’+’r / g / b’ [Enter]
Write Drive Value  : ‘gwd’+’r / g / b’+’value(hex)’ [Enter]
Read CutOff Value  : ‘grc’+’r / g / b’ [Enter]
Write CutOff Value : ‘gwc’+’r / g / b’+’value(hex)’ [Enter]

Flash Write
Save Data to Flash : ‘ds’+ [Enter]
Clear Flash Data : ‘dc’+ [Enter]

****: Version display

moL

2.  V-COM  ADJUSTMENT
Procedure:
1.  The setting of “1. SETTINGS” is completed. 
2.  Connect an oscilloscope to TP1401 (VCOM) and TP1402 

(GND) on the LCD board.

3.  Adjust by using the communication software so that the 

waveform level of oscilloscope becomes 5.8 ± 0.1 V as fol-
lows. 

4.  “dr1” is input by the communication software and “Enter” key 

is pressed.

 

The following numerical value returns from the set.

 

“Read Channel1:0x**”

 

**: Hexadecimal (“00” to “FF”)

5.  To change the adjusted value, “dw1 ##” is input by the com-

munication software and “Enter” key is pressed.

 

The following numerical value returns from the set.

 

“Write Channel1:0x##”

 

##: Hexadecimal (“00” to “FF”)

 

When waveform level is smaller than 5.8 V, the numerical 
value of “##” is increase.

 

When waveform level is larger than 5.8 V, the numerical value 
of “##” is decrease. 

6.  “ds” is input by the communication software and “Enter” key 

is pressed and the numerical value is saved. 

7.  The “Reset” button is pressed and turn the power off.

Example:
When the returning numerical value “8a” and the waveform level 
is 5.6 V.
The numerical value is increased, and adjusted for a waveform lev-
el to become 5.8 ± 0.1 V with “8b→8c→8d→8e→8f→90→91...”.

dr1
Read Channel1:0x8a
dw1 8b
Write Channel1:0x8b
dw1 8c
Write Channel1:0x8c
dw1 8d
Write Channel1:0x8d
ds

←Reading of default value.
←Default value.
←The numerical value is in-
creased and confi rm.

←Enters the range of 
←The numerical value is saved.

3.  FLICKER  ADJUSTMENT
Procedure:
1.  The setting of “1. SETTINGS” is completed.  
2.  Input the PAL white 40% raster signal from AUX2 VIDEO IN 

jack on the VISUAL board. 

3.  In the state of source off, press the [4] → [5] → [4] (keeps 

pressing) button on the remote commander. 

 

The test mode 4 starts, and the following screen is displayed on 
the monitor.

4.  “dr0” is input by the communication software and “Enter” key 

is pressed.

 

The following numerical value returns from the set.

 

“Read Channel0:0x**”

 

**: Hexadecimal (“00” to “FF”)

5.  To change the adjusted value, “dw0 ##” is input by the com-

munication software and “Enter” key is pressed.

 

The following numerical value returns from the set.

 

“Write Channel0:0x##”

 

##: Hexadecimal (“00” to “FF”)

 

Adjust so that the fl icker becomes minimum in the sight.

6.  “ds” is input by the communication software and “Enter” key 

is pressed and the numerical value is saved. 

7.  The “Reset” button is pressed and turn the power off.

± 0.1Vp-p

o

m

If any of the following parts was replaced, perform the “IOP 
Check” as mentioned below.

•  Optical pick-up block (chassis (OP, ZA) complete assy)
•  Complete SERVO board

Precaution
Use the following tools and measuring devices.
• 

DVD test disc TDV-540C (Part No. J-2501-235-A)

• 

CD test disc PATD-012 (Part No. 4-225-203-01)

• 

Digital voltmeter

• 

Accessory remote commander RM-X170

Procedure:
1.  Check the IOP value of DVD and CD by label on the optical 

pick-up.

"

2.  Connect a digital voltmeter to TP51 (IOPDVD) and TP63 

(D3.3V) on the SERVO board.

3.  Playback the DVD test disc (TDV-540C), and make a note of 

the value of digital voltmeter.

4.  Divide the measured voltage value by 1, and convert it into 

current value.

5.  Check that the calculated value is within ±6 mA to the IOP 

value given on the label.

6.  Connect a digital voltmeter to TP47 (IOPCD) and TP63 

(D3.3V) on the SERVO board.

7.  Playback the CD test disc (PATD-012), and make a note of the 

value of digital voltmeter.

8.  Divide the measured voltage value by 1, and convert it into 

current value.

9.  Check that the calculated value is within ±6 mA to the IOP 

value given on the label.