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KV-DX29K9H/KV-DX29K9H/B/DX29K90B/DX29K90L
RM-1006
[ D6BOARD]
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 of CN5509 Pin 9 is 136.3V dc or less.
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
: C8037
IC8002, IC8004
R8072, R8091, R8095,
PH8001
T8001 (FBT)
D6 board
HV REGULATION ADJUSTMENT
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 30.5 ± 0.5kVDC.
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.
: RV8001
: IC8001
R8028, R8078
T8001 (FBT)
D6 board
HV HOLD-DOWN ADJUSTMENT
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.Turn RV8001 counterclockwise.
6. Adjust RV8002 to the 34.30 ± 0.3kVDC reading on the static
voltmeter.
7. After adjustment, turn RV8001 and RV8003 clockwise slowly, and
stop if the HV.PROT circuit works.
RM-1006
RM-1006
SAFETY RELATED ADJUSTMENTS
RM-1006
SECTION 5
5-4. IK PROTECTOR CIRCUIT CHECK (D6 BOARD)
When replacing the following components marked with / on the
schematic diagram, always check IK protector circuit.
IC8001
:
Q8007
R8016, R8027, R8030, R8035, R8036, R8037,
R8038, R8039, R8040, R8041
D6 board
on the
1. Unsolder T8001 (FBT) Pin 1 and connect a DC current meter
between Pin 1 and the pattern.
2. Remove a lead wire connected to CN201 Pin 1 on A1 board
and apply 12VDC to A6 board side from an external DC
power supply.
3. Short circuit C8015.
4. Turn power on, feed the dot signal and set the picture and
brightness to minimum.
5. 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 2275uA.
6. Turn power off.
7. Release C8015 short-circuit.
8. Short circuit C8012.
9. Turn power on, feed the dot signal and set the picture and
brightness to minimum.
10. 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 2275uA.
11. Turn power off.
on
12. Release C8012 short-circuit.
13. Remove the DC current meter and the external DC power
supply and solder the unsolder portions.
– 52 –
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