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13

3. For each item selected, adjust so that the adjustment value is

within the specified value range using the  

R

  and 

 

r

  keys on the

remote controller.

4. After adjustment, press the  MENU  key on the remote controller

to determine the adjustment value.  Press the  MENU  key once
more to change to the next item.

5. After all necessary adjustments are completed, select EXIT

using the  MENU  key on the remote controller and press the
 INPUT  key to display the MENU screen.  Then, select No.7,
SOFT REST using the  MENU  key and determine the selection
using the  INPUT  key to terminate the TEST mode.

1. Place the  POWER SELECT  switch on the set into the B posi-

tion.

2. Turn power on.  While holding the  RESET  key down, depress

the  

R

  key.  Then release the  RESET  key and the  

R

  key in this

order.

3. TEST MODE MENU is indicated.

Select the MENU No. 7, SOFT REST using the  MENU  key on the
remote controller and determine the selection using the  INPUT
key.

The FOR FACTORY mode can be used to perform 13 different
adjustment items with the remote controller.

1. Select the MENU No. 2, FOR FACTORY using the  MENU  key

on the remote controller and determine the selection using the
 INPUT  key.

2. The FOR FACTORY mode is now entered.  The following items

are selected in turn by pressing the  INPUT  key repeatedly.

V Com

Y Gain

Black Limt 

White Limt 

R SUB BRT 

B SUB BRT

R SUB CONT 

B SUB CONT 

Gamma1

Gamma2 

VCO Free

PLL/V Pos

H Pos

14

The following measuring equipment are used for these electrical adjustments:
• Oscilloscope
• NTSC pattern generator
• Stabilized power supply
• Digital voltmeter
• Frequency counter

Unless otherwise specified, the equipment should be connected as shown below.

The 10-step gray scale signal from the NTSC pattern generator is used as an adjustment
signal for V COM voltage/position adjustment as well as VIDEO adjustment.

10-step gray scale signal (with burst), 1Vp-p, 75 

Ω

VIDEO OUT

(75 Ω)

NTSC pattern

generator

main board
TP507(+)
TP500(-)

monitor
XVM-R70

connection box
XA-115

stabilized
power supply
14.4 V

GND

ACC

BA

TT

15

Adjustment Method:
1) Connect frequency counter between TP801 (+) and TP803 (–).
2) Adjust RV801 so that the reading on the counter stands at the

specified value.

Specified value: 242 ± 3 kHz

Adjustment location: LCD board

Adjustment Method:
1) Connect digital voltmeter between TP806 (+) and TP803 (–).
2) Adjust RV802 so that the reading on the counter stands at the

specified value.

Specified value: 5.15 ± 0.02 V

Adjustment location: LCD board

Checking Method:
1) Connect digital voltmeter between TP807 (+) (Vdd) and

TP803 (–).

2) Verify that the reading on the voltmeter is at 3.50 ± 0.2 V.
3) Connect digital voltmeter between TP805 (+) (Vgh) and

TP803 (–).

4) Verify that the reading on the voltmeter is at 17.5 ± 1.5 V.
5) Connect digital voltmeter between TP804 (+) (Vss) and

TP803 (–).

6) Verify that the reading on the voltmeter is at –12.0 ± 1.5 V.

Checking location: LCD board

Adjustment Method:
1) Connect digital voltmeter between TP616 (+) and TP600 (–).
2) Adjust RV600 so that the reading on the counter stands at the

specified value.

Specified value: 2.5 ± 0.15 V

Adjustment location: LCD board

Checking Method:
1) Connect frequency counter between TP612 (+) and TP600 (–).
2) Verify that the reading on the counter is at 14.4 ± 0.2 MHz.

Checking location: LCD board

Condition: DIMMER switch OFF

Checking Method:
1) Connect oscilloscope between TP853 (+) and TP854 (–) using

high voltage proof probes (100:1).

2) Verify that the reading on the oscilloscope is at 550 ± 150 V

(rms).

Checking location: LCD board

Checking Method:
1) Connect oscilloscope between TP853 (+) and TP854 (–) using

high voltage proof probes.

2) Verify that the reading on the oscilloscope is at 68 ± 3 kHz.

Checking location: LCD board

Checking Method:
1) Connect frequency counter between TP405 (+) and TP404 (–).
2) Verify that the reading on the counter is at 6.5 ± 0.2 MHz.

Checking location: LCD board

Checking Method:
1) Press the  INPUT  key on the remote controller and enter the

NTSC mode using the  

R

  and  

r

  keys.

2) Connect frequency counter between TP508 (+) and TP500 (–).
3) Verify that the reading on the counter is at 3.579545 MHz ± 100

Hz.

Checking location: LCD board

Checking Method:
1) Press the  INPUT  key on the remote controller and enter the

PAL mode using the  

R

  and  

r

  keys.

2) Connect frequency counter between TP508 (+) and TP500 (–).
3) Verify that the reading on the counter is at 4.433619 MHz ± 100

Hz.

Checking location: LCD board

Checking Method:
1) Input 400 Hz, –20dB V to TP354 for L channel and TP350 for R

channel.

2) Connect frequency counter to TP353 for L channel and TP352

for R channel.

3) Verify that the reading on the counter stands at the specified value.

Specified value: 2.3 MHz ± 45 kHz for L channel

2.8 MHz ± 45 kHz for R channel

Checking location: LCD board

16

Condition: TEST MODE (See 13 page)

Adjustment method:
1) Select V Com from the FOR FACTORY MODE.
2) Connect oscilloscope between TP809 (+) and TP600 (–).
3) Adjust so that the p-p value A of the waveform stands at the

specified value using the  

R

  and  

r

  keys on the remote controller.

4) Adjust so that the level B on the negative side stands at the speci-

fied value using RV801.

5) Verify that the level C on the positive side stands at the specified

value.

Specified value A: 5.6 ± 0.1 Vp-p
Specified value B: –1.1 ± 0.1 V
Specified value C: 4.5 ± 0.1 V

Adjusting location: LCD board

Conditions: TEST MODE (See 13 page)

10-step gray scale signal input
NTSC mode

Adjustment Method:
1) Select Y Gain from the FOR FACTORY MODE.
2) Connect oscilloscope between TP811 (+) and TP500 (–).
3) Adjust so that the signal level A stands at the specified value

using the  

R

  and  

r

  keys on the remote controller.

Specified value: 3.4 ± 0.1 V

Adjustment location: LCD board

Adjustment Method:
1) Select Black Limit from the FOR FACTORY MODE.
2) Connect oscilloscope between TP811 (+) and TP500 (–).
3) Adjust so that the signal level B stands at the specified value
using the  

R

  and  

r

  keys on the remote controller.

Specified value: 0.65 ± 0.01 V

Adjustment location: LCD board

Adjustment Method:
1) Select White Limit from the FOR FACTORY MODE.
2) Connect oscilloscope between TP811 (+) and TP500 (–).
3) Adjust so that the signal level C stands at the specified value

using the  

R

  and  

r

  keys on the remote controller.

Specified value: 3.85 ± 0.05 V

Adjustment location: LCD board

Adjustment Method:
1) Select R SUS BRT from the FOR FACTORY MODE.
2) Connect oscilloscope between TP812 (+) and TP500 (–).
3) Adjust so that the signal level D stands at the specified value

using the  

R

  and  

r

  keys on the remote controller.

Specified value: 1.1 ± 0.1 V

Adjustment location: LCD board

Adjustment Method:
1) Select B SUS BRT from the FOR FACTORY MODE.
2) Connect oscilloscope between TP810 (+) and TP500 (–).
3) Adjust so that the signal level E stands at the specified value

using the  

R

  and  

r

  keys on the remote controller.

Specified value: 1.1 ± 0.1 V

Adjustment location: LCD board

A

0V

B

0V

C

0V

D

0V

E

0V

C

B

0V

A