Sharp MZ-80B - Page 19

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• Trouble Shooting Chart
Problem (1) No voltage at any output terminal.
Check primary circuit which includes the transformer.
Problem 12)
Problem (3)
No. -5V.
Is approx. 11 V
present on both
ends of C201?
Check IC201, C203
aod R201,
No +12V.
NO
NO
Chlt~k t101, F201,
D201, C201 and
C202.
Check primary
circuit which includes
T101.
Is voltage at the NO
other output ~~~------------------------------------------------ __ ___
terminals normal?
Is approx. 24V
When A309 is
open, does a O.2Vpp
appear at pin
12of1C301,
Check 0301, Q302
and smoothing
circuit,
NO
NO
Check IC3Ql and
circuit of IC301.
-17 -
Check F301, nOl,
D301. C309. C301,
C302 and C304.
Check primary circuit
which includes Tl01.