MiTAC 7521 PLUS/N service manual 131

7521Plus / 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.

Board-level

Troubleshooting for

PIO test error.

YES

Test

OK?

NO

Try another known good PIO device. (Such as printer)

YES

Re-test

OK?

NO

Replace M/B or go

into board-level Troubleshooting.

Correct

it and end.

Change the faulty device then end.

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:	Signals:
J505, C5	P_STB#	P_D/PE
U27, L1	P_D/AFD#	P_D/SLCT
FA1, FA2	P_D/ERR#
FA3, FA4	P_LPD[0:7]
FA5,	P_D/INIT#
CA3~CA6	P_D/SLIN#
	P_D/ACK#
	P_D/BUSY

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