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11.3.1
If communications problems exist with the parallel interface or serial
interface, a test of the plotter's internal parallel or serial interface
circuits may be performed. This "Loop Back Test" will verify that the
parallel or serial communications circuits of the plotter are functioning
correctly. See Figure Chapter 4 .3. This test requires the use of a
Centronics plug (for the parallel test) or an 8-PIN plug (for the serial
test), both made according to the directions in Figure Chapter 4 .3. To
perform the test, proceed as follows:
1. Remove the interface cable from the rear of the plotter.
2. Insert the plug into the interface connector.
3. Advance the menu on the plotter to the SERVICE DIAGNOSTICS
display. Press SELECT. Press the DOWN ARROW once to go to
DIAGNOSTICS SERIAL PORT display, or press the DOWN
ARROW twice to go to the DIAGNOSTICS PARALLEL PORT
display.
necessary.)
4. At either the DIAGNOSTICS SERIAL PORT display or the
DIAGNOSTICS PARALLEL PORT display, press SELECT and
observe
RESULT=ERROR,
communicating correctly and the Main PCB must be replaced.
5. If it displays RESULT=OK, then the communications circuits of the
plotter are functioning correctly. The interface problem is in the
configuration of the plotter, or in the parallel or serial interface
cable, or in the external circuits.
CADJET 2
Parallel Interface and Serial Interface Tests
(Refer to the CADJET 2 Service Menu chart if
the
display
on
the
the
keypad.
communications
circuits
Troubleshooting
If
it
displays
are
not
4-29
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