Specifications

4-8
4.4.4 Parallel Port Loopback Self Test
The printer is capable of testing the parallel port using the loopback connector as defined
in Figure 4.1.
The Parking and FF buttons must be depressed simultaneously before turning power-
on and released after power-on initiate this test.
The printer shall provide each output signal and check input circuits accordingly.
This test is run continuously. Detected failures cause the Fault light to blink and the test
to stop. The printer must be powered off to terminate the test.
Figure 4.1 Parallel Port Loopback
From Printer To Printer
BUSY (11) (1) STROBE
ACK (10) (2) DATA 1
(5) DATA 4
(8) DATA 7
PE (12) (3) DATA 2
(6) DATA 5
(9) DATA 8
(14) Not Used
SLCT(13) (31) INIT
FAULT (32) (4) DATA 3
(7) DATA 6
During this test, the Parallel indicator is On.