Safety Related Adjustments; Hv Service Adjustments; B+ Max Confi Rmation; 3-3. Hv Service Flowchart - Sony TRINITRON KV-32HS20 Service Manual

3-1. X RV8001, RV8002 CONFIRMATION METHOD AND HV SERVICE ADJUSTMENTS
3-2. B+ MAX CONFIRMATION
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)

3-3. HV SERVICE FLOWCHART

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).
If all adjustments are complete, then seal and secure RV8001, RV8002 and
RV8003 (boards using RV8003) with epoxy to prevent any possible
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.
SECTION 3: SAFETY RELATED ADJUSTMENTS
Start
No
Is RHT
Changed?
Yes
misadjustment by non-trained technical service.
Is +B, Vd and
hold down
confirmed?
Yes
Finish for
hold-down
check
KV-32HS20/36HS20/36HS20H/32XBR450/36XBR450/36XBR450H
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
Change any
or
marked parts
Start from
the beginning.
— 17 —
No
Yes
No
Is D-Board
Replaced?
Yes