Power Start Ng (Smp Pwb-1641 Failure) - Tatung OMNISCAN SERIES Service Manual

6.3 POWER START NG (SMP PWB-1641 FAILURE)
YES
LED LIT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - > CHECK HOR. OEF / HV. CIRCUIT
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NO
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CHECK POWER -----------------------------> S801, P801, S820
SELECTOR & SW. (110V-SHORT; 220V-OPEN)
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OK
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CHECK OUTPUT --------------------------------> PINS 2, 3, 4 TO 1 SHORT?
CIRCUIT 0812, 0813, 0814
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CHECK VOLTAGE ----------------------------------> PINS 7, 2 OF T801
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370V (APPROX.)
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NO
r-------------------------------------------->
~~~6'. ~~~~, ~~~,?
R861 SHORT?
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YES 1801
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CHECK START UP ----------------------------------->PIN 7 OF 1801
VOLTAGE < 10V
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YES
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CHECK START UP ----------------------------------->R809, R81O, 0804
CIRCUIT 0806, R812, C808, C809
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OK
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CHECK OVP.
-------------------------------->0802
(A,
K)
SHORT?
PROTECTION 0810, 0809, C815, R824
CIRCUIT R825, C816, R826, R817
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OK
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CHECK OCP. PROTECTION CIRCUIT ---------------------->R828, R822, C818
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CHECK OSC. CIRCUIT --------------------------------->C812, R815, C811
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CHECK VOLTAGE ---------------------------------> R821, 0808, C817, R823
FEEDBACK CKT. R820, R818, R819, R818, C813
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CHECK 1801
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CHECK OUTPUT -------------------------------> R813, 0811, 0803, R828
CIRCUIT R829, C814, 0807, T801
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CHECK OUTPUT CONNECTOR - - - - - - - - - - - - - - - - - - - > P802
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END
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6-3
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