Akai A-5181, Руководство по обслуживанию, Страница: 26 / 50

1 No voltage output
Measure the voltage ofC1 L2 C2
YES
Eliminate short-circuit point
Far less than 320V
Check a.c. and d.c. conversion
elements such as FUSE, power
switch, D1 D2 D3 D4 etc.
Open circuit of 1~3 pins of T
Measure whether the voltage of 1
pin IC (VFF) is equal to 2.8V
Measure whether the voltage of 5
pin IC2 (5) is equal to 6.3V
Check whether C5 R2 D7 C4 R4
C6 are damaged
Test whether the windings of T are
short circuit, open circuit
YES
NO
YES
Replace T
PIC 817 Z1 are damaged
Measure the voltage of 5pin (VCC)
of IC2
Measure each output terminal to see
whether it is short circuit
NO
About 320V
0V
About 320V
YES
NO
NO
Measure other elements
8
8-6