DTA-9.4
D902
SM25GZ51
2
1
3
L904
NCH-1594
1
2
3
4
D901
RBV-2506
D907
SEL4110R
C912
1500/200
C910
1500/200
C911
1500/200
C909
1500/200
C918
104
(50V)
R924
33K (1W)
R923
33K (1W)
R904
1K
(1/2W)
R905
270
(1W)
R903
4.7
(5W)
UDD:168V UJJ:141V
PRI DC LIVE
WARNING
To NAPS-7790
NAPS-7788
U1
D907
PRI DC LIVE
WARNING
NAPS-7789
NAPS-7788
NAPS-7789
NAPS-7790
DISASSEMBLING PROCEDURES-1
ATTENTION ON DISASSEMBLIING
2. Handling of copper parts
Many parts made with copper, such as copper plate and copper plating screw are used for this unit.
Don't touch empty-handed with these parts, in order to prevent rusting these parts.
Wear a glove, in case handling these parts.
Typical parts are shown below.
After turning off a power supply switch, the high voltage is maintained in the following circuit (fig-1) for a long time.
In order to prevent short-circuit, be careful not to drop metallic parts etc. around this circuit.
Before disassembling, you have to discharge circuit voltage by following one of methods.
Where electric discharge is completed, PRI DC LIVE WARNNIG LED D907 (Fig-1, Fig-2) puts out the light.
[1]
Wait for about 1 hour in the state of power supply OFF.
[2]
Disassemble to the state of 11 of the DISASSEMBLING PROCEDURES-3, being careful not to make it short-circuit.
And connect dummy resistance (300-500ohm/ 3W) to the both ends of C909 on primary power supply PC board (NAPS-7788),
and discharge compulsorily.
1. Before disassembling
[Fig-1]
Refer to C-1 in SCHEMATIC DIAGRAMS-3
DC 168V
[Fig-2]
Dummy resistance
300-500ohm/3W
for electric discharge
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