Safety Related Adjustment; Hv Regulation Adjustment; Hv Hold-Down Adjustment; Hv Protector Adjustments - Sony Trinitron KV-HS29M90 Service Manual

4-1. HV REGULATION ADJUSTMENT

When replacing the following components marked with ]
on the schematic diagram, always check hold-down volt-
age and if necessary re-adjust.
[ : VR8001
] : C8016, C8037,
D8020,
IC8001, IC8002,
Q8035, Q8043,
R8042, R8072, R8078, R8079, R8091, R8095
T8005(FBT),
D board
(1) Input all black signal, and put into Full mode and
Standard.
Be sure to perform the HV adjustment within 1 to 3
minutes after the power on.
(2) Adjust RV8002 so that the HV voltage meets the
specification below.
KV-HS34/38 : 32.3 ±0.1 kV
KV-HS29 : 30.3 ±0.1 kV
(3) After the check is finished, put the VR cover on
RV8002, and fixed it with RTV.
VR8001, VR8002
Fig. 4-1
KV-HS29M61/M90/M91, HS34M61/M90/M91, HS38M61/M90/M91
SECTION 4

SAFETY RELATED ADJUSTMENT

RTV KE490
– 38 –

4-2. HV HOLD-DOWN ADJUSTMENT

When replacing the following components marked with ]
on the schematic diagram, always check hold-down volt-
age and if necessary re-adjust.
[ : VR8002
] : IC8004, IC8005, IV8006
PH8003
R8014, R8015, R8017, R8128, R8129, R8131,
T8005(FBT)
4-2-1. HV Protector Adjustment
(1) Input the all white signal.
(2) Turn RV8001 fully clockwise.
(3) Adjust RV8002 so that the HV voltage meets the
specification below.
KV-HS34/38 : 36.0 ±0.1 kV
KV-HS29 : 34.3 ±0.1 kV
(4) Turn RV8001 slowly and stops its rotation when the
voltage becomes fold-down.

4-2-2. HV Protector Check

(1) Input the all white signal.
(2) Adjust RV8002 so that the HV voltage meets the
specification below.
KV-HS34/38 : 35.0 ±0.1 kV
KV-HS29 : 35.3 ±0.1 kV
*: Check that the fold-down is not activated.
*: Measure the positive terminal (+) of C8002, and
check that it is Low.
(3) Short between both leads of C8006.
(4) Adjust RV8002 so that the HV voltage meets the
specification below.
KV-HS34/38 : 36.0 ±0.1 kV
KV-HS29 : 34.3 ±0.1 kV
(5) Open the positive terminal (+) of C8006 from short
circuit.
Check that the hold-down is activated.
(6) Short the positive terminal (+) of C8006.
(7) Apply 5.5 V between both leads of C8016.
Check the HV falls down.
(8) Disconnect the 5.5 V from both leads of C8016.
Check that the HV returns.
(9) After the check is finished, put the VR cover on
RV8001, and fixed it with RTV.
RM-997