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DISASSEMBLING PROCEDURES-1
ATTENTION ON DISASSEMBLIING
1. Before disassembling
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.
[Fig-1]
Refer to C-1 in SCHEMATIC DIAGRAMS-3
U1
NAPS-7788
DC 168V
TE
L 13942296513
To NAPS-7790
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.
NAAF-7797
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.
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D902
SM25GZ51
1
2
3
R903
4.7
UDD:168V UJJ:141V
(5W)
Dummy resistance
D901
300-500ohm/3W
RBV-2506
for electric discharge
NAPS-7789
NAPS-7788
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2 9
8
[Fig-2]
R905
270
(1W)
PRI DC LIVE
WARNING
4
3
L904
Q Q
NCH-1594
3
6 7
1 3
1 5
2
1
co
.
9 4
2 8
D907
PRI DC LIVE
WARNING
0 5
8
2 9
9 4
2 8
NAPS-7789
NAPS-7790
m
DTA-9.4
9 9
9 9
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