5-2
UP-960(UC)
UP-960CE(CE)
5-2. PRINT IS TOO DARK OR TOO LIGHT
START
The data buses of IC7 and
IC603 or peripheral circuit
IC2 on MA-91 board are
defective.
IC203 and IC201 or
peripheral circuit of Q16 on
MA-91 board are defective.
YES
Is voltage
(approx. 5.7 V) at pin 4 of IC6
on MA-91 board output when
"CONTRAST" is set as
center value?
NO
YES
Is voltage
(approx. 1.5 to 2.5 V)
available at pin 78 of IC505 on
MA-91 board when head
is at the normal
temperature?
NO
Peripheral circuit Q21 on
MA-91 board is defective.
The head voltage or CN202
on MA-91 board is defective.
Peripheral circuit IC404 and
pins 15 and 16 of CN202 line
on MA-91 board, or the
thermistor in the head are
defective.
YES
Are required
voltages available at each
terminal, 3 V at 19 pin of IC6 and
IC7 on MA-91 board, and
1 V at 23 pin of
the IC's?
NO
YES
Is density of stair step
printed in test mode properly?
NO
Peripheral circuits IC203 and
IC201 or Q15 and Q17 on
MA-91 board are defective.
YES
Is voltage
(approx. 1.4 V) at pin 6 of IC6
on MA-91 board output when
"BRIGHT" is set as
center value?
NO
Summary of Contents for UP-960
Page 1: ...VIDEO GRAPHIC PRINTER UP 960 UP 960CE 1st Edition SERVICE MANUAL ...
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Page 75: ...8 1 8 1 UP 960 UC UP 960CE CE SECTION 8 BLOCK DIAGRAMS ...
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