Service manual

6-30 DECcolorwriter 1000
6 Troubleshooting
Image processor self-diagnostics
Image processor rear panel switches for self-testing
All the image processors feature types of self-diagnostic modes. The type of
self-diagnostics run depend upon the position of rear panel DIP Switches 2, 3 and 4. The
switch combinations are listed here. The selected self-diagnostics begin upon power-up
or after a hardware reset (DIP Switch 1 is toggled).
Switch
2 3 4 Self-diagnostic mode
↓ ↓ ↓ Normal power-up self-test
↑ ↓ ↓ Fixed RS-232 parameters
↓ ↑ ↓ Use NVRAM-stored Color Adjust setting
↑ ↑ ↓ Manufacturing Service test
↓ ↓ ↑ Configuration page/NVRAM Reset
↑ ↓ ↑ Demo pages
↓ ↑ ↑ Verification mode
↑ ↑ ↑ No self-diagnostics
Normal power-up self-test. This test requires no paper or customer interaction. If a
problem is encountered with the image processor's expansion memory or other options,
then the information is printed on the printer's start up page. Normal power-up tests take
between 40 to 80 seconds.
No self-diagnostics. The printer skips all self-tests and goes directly to PostScript
initialization.
Verification self-test. This test requires no paper and no customer interaction.
Disconnect all host cables from the printer before starting the test. Verification tests take
between 1 and 2 minutes.
Note Be sure to disconnect any terminal or host connected to the serial port
if you do not want it to receive the self-test messages.
During the verification self-test the test results are transmitted out the serial port.
Communication parameters for the serial port are 9600 baud, 8 data bits, no parity, 2 stop
bits. The rear panel LED flashes irregularly as the tests are executed (on for one test, off
for the next).