3 Diagnostic Programs

3.9 Communication

3.9Communication (COMM)

Subtest 01 LPT

This test item is to check whether there is open or short circuit issue in the external pins by looping back the external pins, controlling the voltage of each data pin, control pin and status pin.

The test requires an external connector to insert into the tested LPT port. Below is the connector's description.

Fixture Description:

(9)+ PD7

(8)+ PD6

(7)+ PD5

(6)+ PD4

(5)+ PD3

(15)-ERROR

(14)-AUTFD

(13)

(16)-PINIT

(1)- STROBE

(10)- ACK

(4)

+ PD2

 

 

(12) + PE

 

 

(3)

+ PD1

 

 

(17) - SLIN

 

 

(2)

+PD0

 

 

(11)+ BUSY

 

Note: (1)~(17)

--------

Pin number

PD0~ PD7--------

Data Line

Status Line --------

–ERROR(S3), +SELECT(S4), –ACK(S6), +PE(S5), +BUSY(S7)

Control Line --------

–AUTFD(C1), –PINIT(C2), -STROBE(C0), –SLIN(C3)

1. Register Check

Check whether the data register and control register works normally.

2. IRQ Check

Check whether LPT interrupt works normally.

3. External Loop back

Check whether there is open or short circuit issue.

4. ECP Mode

54 dynabook AX/Satellite AW2/Equium A60/Satellite A60/ Satellite Pro A60 A65 Maintenance Manual

Page 124
Image 124
Toshiba PRO A60, A65, SATELLITE A60 manual Communication Comm, Diagnostic Programs Communication, Subtest 01 LPT, Status Line