Safety Related Adjustments; Hv Service Adjustments; B+ Max Confi Rmation; Hv Service Flowchart - Sony Trinitron KV-40XBR700 Service Manual

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

3-3. HV SERVICE FLOWCHART

Replace RV8001, 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 RV8002 slowly to obtain
35.5kV.
3. Turn RV8001 clockwise slowly until hold down operation initially activates.
4. Adjust RV8002 clockwise, then turn the set on. 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.
5. 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 with
epoxy to prevent any possible misadjustment by non-trained technical
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 ± 0.5 Vdc at Pin 2 of CN5506, then confirm that set holds down.
SECTION 3: SAFETY RELATED ADJUSTMENTS
Start
Is T8001
Changed?
Yes
service.
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
Start from
the beginning.
— 18 —
Change any
No
or
marked parts
Yes
Is D-Board
Replaced?
Yes
KV-40XBR700
No