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SECTION 5
TROUBLESHOOTING
5-1.
PRINT IS FAULTY
UP-980(UC)
UP-980CE(CE)
START
is video signal
(AD-IN) available at pin
21 of IC7 and IC8 on
MA-91 board?
NO
YES
Are video signals
output from data buses
of IC7 and IC8 on
MA-91 board?
NO
YES
Is signal
available at pin 14 of IC7
and IC8 on MA-91
board?
YES
NO
Is test pattern
properly printed in test
mode?
NO
YES
Peripheral circuits IC6 and
{C2 on MA-91 board are
defective.
Peripheral circuits IC7 and
IC8 on MA-91 board are
defective.
Pins 16 and 18 line of IC601
on MA-91 board are defective
CN202 line on MA-91 board
is defective.
Peripheral circuits IC601,
1C602 and IC603 on MA-91
board are defective.
5-1
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