Toshiba A105 S4064 Maintenance Manual - Page 135

3.10 Peripheral 3 Diagnostic Programs 3.9 Communication (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 (4) + PD2 (3) + PD1 (2) +PD0 Note: (1)~(17) -------- Pin number (10) - ACK (12) + PE (17) - SLIN (11)+ BUSY 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 Satellite A100/A105 / TECRA A7 Maintenance Manual 59