Section 3: Safety Related Adjustments; Rv8002 Confi Rmation Method (Hv Hold-Down Confi Rmation) And Readjustments - Sony TRINITRON KV-34FV310 Service Manual

3-1. X RV8002 CONFIRMATION METHOD
(HV HOLD-DOWN CONFIRMATION) AND
READJUSTMENTS
Always perform the following adjustments when replacing the following
components marked with a Y mark on the schematic diagram:
Part Replaced (Y)
D BOARD:
D8022, IC8001, IC8004, IC8005,
IC8104, R8014, R8015, R8016,
R8017, R8019, R8021, R8046,
R8052, R8072, R8078, R8079,
R8082, R8091, R8095
GW BOARD:
IC601
PREPARATION BEFORE CONFIRMATION
Equipment: HV meter, DVM, Analog Current meter.
Condition: AC input voltage: 130 (+ 2) VAC.
Set condition: Reset condition.
Signal Input: All black video signal for Cut off, All white signal for High
light.
HV PROTECTOR CHECK-CUT OFF
CONDITION
1. Remove D board and carefully lift as necessary to gain access to the
bottom of the board. Open ABL pin 1 on RHT (T8001) and connect
analog current meter.
2. Make Cut Off condition. Input all black video signal and set picture
and brightness to min., ABL current should be approximately 0.16 ±
0.05mA for 34/38".
3. Short across C8002, C8021 and C8301.
4. Turn off the set and install precision VR jig (initially set to 100K) to IC
8005 pin 1 and GND (C8076 -). Restore power and adjust to obtain
36.0 ± 0.2kV for 34/38".
5. Remove short from C8002 and confi rm that hold down activates.
6. Short C8002 again and confi rm that HV recovers.
7. Then readjust precision VR jig to obtain 32.5 ± 0.2kV for 34/38".
8. Remove short from C8002, C8021 and C8301.
9. Confi rm that hold down does not activate
.

SECTION 3: SAFETY RELATED ADJUSTMENTS

Adjustment (X)
HV HOLD DOWN
RV8002
HV PROTECTOR CHECK-HIGH LIGHT
CONDITION
1. Short across C8002, C8021, C8301, C8012 and C8015.
2. Open pin 10 (ABL) of IC301 (YCJ).
3. Set video to white fi eld. Set HV current load to iabl = 3.04 ± 0.05mA
for 34/38" by adjusting picture and brightness to maximum condition.
4. Adjust VR jig to obtain 34.25 ± 0.2kV for 34/38".
5. Remove short from C8002 and confi rm that hold down activates.
6 Short C8002 again and confi rm that HV recovers.
7 Then readjust precision VR jig to obtain 32.0 ± 0.2kV for 34/38".
8. Remove shorts from C8002, C8021 and C8301.
9. Confi rm that hold down does not activate.
10.Remove shorts from C8012, C8015.
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KV-34FV310/38FV310