Sharp UX-B20 Service Manual page 42

UX-B20U/UX-B20C/B25C
• MISSING NOZZLES (RESULT OF CHECK PATTERN
OR CLEAN NOZZLES)
CLEAN NOZZLES
REPLACE ANOTHER CARTRIDGE
MISSING MANY NOZZLES
CHECK THE SOLDER
CNHEAD1,2 (CONTROL PWB)
CHECK +11.82V (CNHEAD1-5,6PIN)
CHECK +30V (CNHEAD1-8PIN)
CHECK +3.3V (CNHEAD1-4PIN)
REPLACE IC10
NG
NG
YES
OK
OK
OK
OK
CHECK IC AND CONNECTOR
NO
CORRECT SOLDER
NG
CHECK RESISTANCE BETWEEN
+11.82V AND GND, SHORT OR NOT.
NG
NO
CHECK +11.82V PATTERN
CHECK RESISTANCE BETWEEN
+30V AND GND, SHORT OR NOT.
NG
NO
CHECK +30V PATTERN
CHECK RESISTANCE BETWEEN
+3.3V AND GND, SHORT OR NOT.
NG
NO
CHECK +3.3V PATTERN
3 – 5
SHORT
REPLACE CONTROL PWB
SHORT
REPLACE CONTROL PWB
SHORT
REPLACE CONTROL PWB