Service manual

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