Service manual

148
8575
8575
A N/B Maintenance
A N/B Maintenance
8.10 PIO Port Test Error
When a print command is issued, printer prints nothing or garbage.
One of the following parts or signals on the motherboard may
be defective, use an oscilloscope to check the signals or replace
the parts one at a time and test after each replacement.
Yes
No
Parts: Signals:
Test
OK?
Replace the
faulty parts.
1. Check if PIO device is installed
properly. (J504)
2. Check CMOS LPT port setting properly.
Try another known good
PIO device.
No
Re - Test
OK?
End
Yes
Board-level
Troubleshooting
Correct it
Replace
Motherboard
PIO Port Test Error
Yes
No
U511
J7
RP501
RP503
RP504
RP505
R501
CP503
CP504
CP505
CP506
C504
PJ2
U501
U502
J3
RP1
RP2
R1
RP3
RP4
D1
+5VS
P_LPD0
P_LPD1
P_LPD2
P_LPD3
P_LPD4
P_LPD5
P_LPD6
P_LPD7
-P_STB
-P_AFD
-P_ERR
-P_INIT
-P_SLIN
-P_ACK
P_BUSY
P_PE
P_SLCT
M/B D/D