Sony KV-27FV310 - 27" Fd Trinitron Wega, Service Manual

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KV-27FV310/29FV310/32FV310/36FV310
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 field. Set HV current load to
iabl = 2.74 ± 0.05mA
for 27/29” and iabl = 3.04 ± 0.05mA for 32/36” by adjusting picture
and brightness to maximum condition.
4. Adjust VR jig to obtain 33.10 ± 0.2kV for 27/29” and 34.25 ± 0.2kV
for 32/36”.
5. Remove short from C8002 and confirm that hold down activates.
6 Short C8002 again and confirm that HV recovers.
7 Then readjust precision VR jig to obtain
31.0 ± 0.2kV for 27/29” and
32.0 ± 0.2kV for 32/36”.
8. Remove shorts from C8002, C8021 and C8301.
9. Confirm that hold down does
not activate.
10.Remove shorts from C8012, C8015.
SECTION 3: SAFETY RELATED ADJUSTMENTS
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:
D BOARD: HV HOLD DOWN
D8022, IC8001, IC8004, IC8005, RV8002
IC8104, R8014, R8015, R8016,
R8017, R8019, R8021, R8046,
R8052, R8072, R8078, R8079,
R8082, R8091, R8095
GK BOARD:
IC601
Part Replaced ( ) Adjustment ( )
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
0.15 ±
0.05mA for 27/29” and 0.16 ± 0.05mA for 32/36”.
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
34.6 ± 0.2kV for 27/29” and 36.0 ± 0.2kV for 32/36”.
5. Remove short from C8002 and confirm that hold down activates.
6. Short C8002 again and confirm that HV recovers.
7. Then readjust precision VR jig to obtain
31.5 ± 0.2kV for 27/29” and
32.5 ± 0.2kV for 32/36”.
8. Remove short from C8002, C8021 and C8301.
9. Confirm that hold down does
not activate
.
Y X