Laptop User Manual

131
7521
7521
Plus / N N/B MAINTENANCE
Plus / N N/B MAINTENANCE
8.12 PIO PORT TEST ERROR
When a print command is issued, printer prints nothing or garbage.
PIO TEST ERROR
1. Check the PIO device is installed
properly.(J505)
2. Confirm CMOS LPT port and
extended mode setting properly.
Test
OK?
Re-test
OK?
Replace M/B or go
into board-level
Troubleshooting.
NO
YES
NO
YES
Correct
it and end.
Change the
faulty device
then end.
Board-level
Troubleshooting for
PIO test error.
Check the following parts for cold solder or one of the following parts
on the mother-board may be defective, use an oscilloscope to check
the following signal or replace the parts one at a time and test after
each replacement.
Parts:
J505, C5
U27, L1
FA1, FA2
FA3, FA4
FA5,
CA3~CA6
Signals:
P_STB#
P_D/AFD#
P_D/ERR#
P_LPD[0:7]
P_D/INIT#
P_D/SLIN#
P_D/ACK#
P_D/BUSY
P_D/PE
P_D/SLCT
Try another known good PIO device.
(Such as printer)