Safety Related Adjustments; B Max Voltage Confirmation; Hv Regulation Circuit Adjustment; Hv Protector Circuit Adjustment - Sony Trinitron KV-HR36M90 Service Manual

KV-HR36M90
RM-1007
[ D BOARD]

5-1. +B MAX VOLTAGE CONFIRMATION

1. Supply 242 ± VAC to variable autotransformer.
2
0
2. Receive dot signal pattern and set the PICTURE and
BRIGHTNESS settings to their minimum.
3. Confirm the voltage between the both sides of C6512 on D
board is 137.0 V dc.

5-2. HV REGULATION CIRCUIT ADJUSTMENT

ollowing components marked with
When replacing the f
schematic diagram always check HV regulation, and if neces-
sary re-adjust.
: RV8002
: IC8004, IC8005,
R8014, R8015, R8017
PH8003
T8001 (FBT)
D board
1. Connect a HV static voltmeter to the unconnected plug of the high-
voltage block.
2. Power on the set.
3. Receive the dot signal.
4. Set PIC MIN/BRT MIN.
5. Confirm that the static voltmeter reading is 31.5 ± 0.3kVDC.
6. If not, adjust with RV8002 to the specified value.

5-3. HV PROTECTOR CIRCUIT ADJUSTMENT

When replacing the following components marked with
the schematic diagram always check hold-down voltage and if
necessary re-adjust.
: RV8002
: D8014
IC8001
R8016, R8019, R8046, R8052, R8072,
R8078, R8079, R8165
T8001 (FBT)
D board
1. Connect a HV static voltmeter to the unconnected plug of the high-
voltage block.
2. Power on the set.
3. Receive the dot signal.
4. Set PIC MIN/BRT MIN.
5. Adjust RV8002 to the 36.6kVDC reading on the static voltmeter.
SECTION 5

SAFETY RELATED ADJUSTMENTS

on the
on
– 56 –

5-4. IK PROTECTOR CIRCUIT CHECK (D BOARD)

When replacing the following components marked with / on the
schematic diagram, always check IK protector circuit.
: D8004
IC8001
Q8007,Q8008
R8027, R8029, R8030, R8031, R8035,
R8037, R8038, R8039, R8040, R8041, R8043,
D board
1. Unsolder T8001 (FBT) Pin 1 and connect a DC current meter
between Pin 1 and the pattern.
2. Short circuit C8015.
3. Turn power on, feed the dot signal and set the picture and
brightness to minimum.
4. Feed the all white signal, increase the picture and brightness
slowly and check the hold-down works when the reading on
the DC current meter is 2670uA.
5. Turn power off.
6. Release C8015 short-circuit.
7. Short circuit C8012.
8. Turn power on, feed the dot signal and set the picture and
brightness to minimum.
9. Feed the all white signal, increase the picture and brightness
slowly and check the hold-down works when the reading on
the DC current meter is 2670uA.
10. Turn power off.
11. Release C8012 short-circuit.
12. Remove the DC current meter and the external DC power
supply and solder the unsolder portions.