7521Plus / N N/B MAINTENANCE
8.12 PIO PORT TEST ERROR
When a print command is issued, printer prints nothing or garbage.
IRQ7
SH19
U27
PC97338VJG
SUPER I/O
D/STB#
D/AFD#
D/INIT#
D/SLIN#
D/ACK#
D/BUSY
D/PE
D/SLCT
D/ERR#
D/LPD[0:7]
FA1
FA2
FA3
FA4
L1
P_STB#
P_D/AFD#
P_D/INIT#
P_D/SLIN#
P_D/ACK#
P_D/BUSY
P_D/PE
P_D/SLCT
P_D/ERR#
P_LPD[0:7]
CA3,CA4,CA5,CA6,C5
J505 SH19
PRINTER
PIN DEFINITION OF PIO PORT
PIN 1 | STB | STROBE SIGNAL | PIN 14 | AFD | AUTO LINE FEED |
PIN | D0 - D7 | PARALLEL PORT DATA BUS D0 TO D7 | PIN 15 | ERR | ERROR AT PRINTER |
PIN 10 | ACK | ACKNOW LEDGE HANDSHANK | PIN 16 | INIT | INITIATE OUTPUT |
PIN 11 | BUSY | BUSY SIGNAL | PIN 17 | SLIN | PRINTER SELECT |
PIN 12 | PE | PAPER END | PIN | SIGNAL GROUND | |
PIN 13 | SLCT | PRINTER SELECTED |
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LO OPBACK CONNECTOR FOR PIO TEST:
PIN 1, 13 | SHORT | PIN 10,16 | SHORT |
PIN 2, 15 | SHORT | PIN 11,17 | SHORT |
PIN 12, 14 | SHORT |
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LOOPBACK CONNECTOR FOR EPP TEST:
PIN 1, 2, 4, 6, 8 | SHORT |
PIN 3, 5, 7, 9, 16 | SHORT |
PIN 18, 19, 20, 21, 22, 23, 24, 25 | SHORT |
