Safety Related Adjustments; I3 . X 4 X Voltage Confirmiwtion; Hv Regli14Ation Clrcltit Adjustment; Hv Protector Circlv Adjustam Ent - Sony KV-HR36M31 Service Manual

SAFETY RELATED ADJUSTMENTS
[ D BOARDj
5-1. +B MAX VOLTaGE CONFIRMATION
1. Supply 242
.-
;
VAC to variable autotransformer.
2. Receive dot signal pattern and set the PICTliRE and
BRIGHTNESS settings to their minimum.
7. Confirm the voltage between the both sides of C6512 on D
board is 137.0 V dc.
5-2. HV REGULATION CIRCUIT ADJUSTMENT
\When replacing the
following components marked with
2
on the
schematic d i a ~ a m always check HV regulation, and if neces-
sary re-adjust.
B:
RV8002
I :
lC8004, IC8005,
R8014, R8015, R8017
pH8003
T8001 (FBT)
D board
1. Connect a HV static voltmeter to the unconnected plug of the high-
volta_re block.
2. Power on the set.
3. Receive the dot signal.
4. Set PIC MLV/BRT him.
5. Confirm that the static voltmeter reading is 31.5
2
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
@
on
the schematic diagram always check hold-down voltage and if
necessary re-adjust.
El:
RV8002
2:
D8014
IC8001
R8016, R8019, R8046, R8052, R8072,
R8078, R8079, R8165
T8001 (FBT)
D
board
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
(28007.Q8008
R8027, R8029, R8030, R803 1. R8035.
R8037, R8038, R8039, R8040, R8041. R8043,
D board
1. Unsolder T800 1 (FBT) Pin 1 and connect a DC current meter
between Pin i and the pattern.
7 .
Short circuit CYOl5.
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 bri~htness
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 dl white signal, increase the picture and brighmess
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.
1.
Connect a HV static voltmeter to the unconnected plug of the high
voltage block.
2. Power on the sel.
3. Receive the dot signal.
4. Set PIC MX/BRT MI&.
5.
:idjust RV8002 to the 36.6kVDC reading on the static voltmeter.