Safety Related Adjustments; Hv Service Flowchart - Sony TRINITRON KD-34XBR2 Service Manual

X RV8001, RV8002 CONFIRMATION METHOD AND HV SERVICE ADJUSTMENTS
B+ MAX CONFIRMATION
Standard ............................................................................ 135.3 ± 1 VDC
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)

HV SERVICE FLOWCHART

Replace RV8001 and RV8002 with the same value:
HV project adjust and inspection
1. Turn RV8001 fully counter-clockwise.
2. Turn set on with black video signal then adjust
3. Adjust RV8001 clockwise slowly until hold down
4. Adjust RV8002 clockwise, then turn the set on.
5. Finally, set back RV8002 to 31.50kv + 0.2kv at video
RV8001 and RV8002 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
2. Confirm Vd at pin 2 CN6506 or at TP-Vd for 4.3V <
3. Apply 5.5 + 0.5 Vdc at pin 2 of CN6506, then confirm
SECTION 9: SAFETY RELATED ADJUSTMENTS
Start
Is RHT
Changed?
Yes
RV8002 slowly to obtain 34.8 kV.
protect just activates.
Change video to white field then slowly turn RV8002
counter-clockwise to get 34.8 ± 0.2kv. Confirm set
does NOT TURN OFF at this condition. If yes, then
repeat from step 1 again.
cut off (black video).
If all adjustments are complete, then seal and secure
misadjustment by non-trained technical service.
135.3 ± 1 Vdc.
Vd < 4.65 Vdc.
that set holds down.
Is +B, Vd and
hold down
confirmed?
Yes
Finish for
hold-down
check
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
No Change any
marked parts
Start from
the beginning.
— 33 —
No
or
Yes
No
Is D-Board
Replaced?
Yes
KD-34XBR2