Sony KL-W9000 service manual Gnd

– 32 –

Adjustment Items and Procedure

Tools and

Test Points

Adjustment Places

Illustration Waveforms and Values

Signals

10 IRE

100 IRE

B

3)

B channel

A

1.

Using *DC power, apply 0V to *TP5611.

* DC power

* TP5611 [BLBS]

10 IRE

* TP5607 is Ref.

GND

2.

Connect *oscilloscope to *TP5603, and adjust *RV5605 so

* Oscilloscope

* TP5603 [B-SIG2]

* RV5605 [B. GAIN]

* A : 1.35±0.02Vp-p

that 10 IRE ~ 100 IRE (A) becomes *1.35±0.02Vp-p.

3. Adjust *RV5601 so that the forward 10 IRE ~ reverse 10 IRE

* TP5603 [B-SIG2]

* B : 5.90±0.02Vp-p

±

* RV5601 [B. BIAS]

(B) becomes *5.90 0.02Vp-p at *TP5603.

4. Confirm that a difference in voltage amplitude of forward 10

* TP 5602 [B-SIG1]

IRE ~ 100 IRE and forward 10 IRE ~ reverse 10 IRE between

* TP5604 [B-SIG3]

waveform at *TP5602,*TP5604 and waveform at *TP5603 is

* TP5603 [B-SIG2]

within ±150mV.

4. Vcom Adjustment

∙ *Using *I2C bus encoder, set the NT-WIDE mode.

*I2C bus encoder

∙

*Enter NT double speed 10-step signal of *bias 2.2V and amplitude

*

2.0 ± 0.02 Vp-p

1.8Vp-p to the CN5201 pins 2~4.

$

100 IRE

10 IRE

4

GND

2.7 ± 0.02 V

Use TP5201,

TP5401 and TP5601

as reference GND

respectively.

1. Measure voltage at the *TP5203 with digital voltmeter.

* (Value in 1) – 0.60±0.02V

* Voltmeter

* TP5203 [Rch OUT]

2. Adjust *RV5202 so that the voltage at *TP5205 becomes

* TP5205 [R-Vcom

* RV5202 [R.VCOM]

*(Value in 1) – 0.60±0.02V.

OUT]

3.

Measure voltage at the *TP5403 with digital voltmeter.

* Voltmeter

* TP5403 [Gch OUT]

KL-W7000/W9000RM-Y980