KV-32HS20 - Sony TV Service Manual (repair manual). Page 17

Standard ............................................................................ 135.3 ± 1 VCD

Check Condition:

 

AC input voltage:  ........... 120 (± 2) VAC at Board Adjustment Process

 

 

................................................ 130 (± 2) VAC at QC

 

 

... 120 (± 2) VAC at Overall Adjustment (after aging)

 Note:  If using a stabilized power supply, make sure that the distortion 

  

factor is 3% or less. 

Setting mode: ............................................................................ Full mode

Signal input:.................................................. Cross-hatch of NTSC at QC

Initial setting:...........................................................Reset condition at QC

Confi rm point: ........................................ Across C6544 for B+ of D Board

3-1.  X RV8001, RV8002 CONFIRMATION METHOD AND HV SERVICE ADJUSTMENTS

Is RHT 

Changed?

Is D-Board 

Replaced?

Replace RV8001, RV8002 and RV8003 (Board provided with RV8003) with the 
same value:
HV project adjust and inspection

1. Turn RV8001 and RV8003 (only applicable when RV8003 is used in the circuit) 

fully counter-clockwise.

2.  Turn set on with black video signal then adjust RV8002 slowly to obtain 

35.5kV ± 0.2kV.

3. Case 1 (Board provided with RV8003):

- Turn RV8001 (coarse adjust) clockwise slowly until hold down operation 

initially activates.

- Turn the set off and turn back RV8001 approximately 1/16 of a turn, then turn 

the set back on.

- Turn RV8003 (fine adjust) slowly clockwise until hold down operation initially 

activates.

Case 2 (Board NOT provided with RV8003):
- Turn RV8001 clockwise slowly until hold down operation initially activates.

5.  Adjust RV8002 clockwise, then turn the set on.  Change video to white field then 

slowly turn RV8002 counter-clockwise to get 35.0 ± 0.2kv. Confirm set does 
NOT TURN OFF at this condition. If yes, then repeat from step 1 again.

6.  Finally, set back RV8002 to 31.50kv + 0.2kv at video cut off (black video).

Start

No

Yes

Change any

or

marked parts

Yes

No

Yes

No

Yes

Is +B, Vd and

hold down

confirmed?

Finish for

hold-down

check

Start from

the beginning.

Confirm +B, Vd and check hold-down on the D board video with no signal (standard 
reset mode) as follows:
1. Confirm +B across C6544 to make sure that it is 135.3 ± 1 Vdc.
2. Confirm Vd at pin 2 CN5506 or at TP-Vd for 4.3V < Vd < 4.65 Vdc.
3. Apply 5.5 ± 0.3 Vdc at pin 2 of CN5506, then confirm that set holds down.

If all adjustments are complete, then seal and secure RV8001, RV8002 and 

RV8003 (boards using RV8003) with epoxy to prevent any possible 

misadjustment by non-trained technical service.