AGFA Avantra 36/44 Service Manual page 93

Avantra 36/44 Service Manual
3.2.3.3 LED Error Reporting
An LED on the DEC board indicates whether the boot has successfully completed.
A red light indicates either that the boot sequence has not been completed or an
error condition exists. When the LED goes out, the boot sequence has completed
with no errors.
3.2.3.4 DIAG Micro-controller Test Descripions
The following describes tests performed on the DIAG micro-controller during the
boot sequence.
3.2.3.5 Offgate Register Test
The offgate register loads the starting address pointer for both the correction SRAM
and the FLASHROM. The offgate register test writes a six byte sequence, where the
first three bytes represent the test data and the last three bytes are a sequence of
zeros used to retrieve the previous three bytes written. As the data is read back, it
gets shifted left by 5.
3.2.3.6 Ongate Register Test
The ongate register test writes a 6 byte sequence, where the first three bytes repre-
sent the test data and the last three bytes are a sequence of zeros used to retrieve
the previous three bytes written. As the data is read back, it gets shifted left by 5.
3.2.3.7 Vacuum Register Test
The vacuum register is a byte wide register that, besides the vacuum select bits,
contains the fake or real clock bit and the upper two bits of the FLASHROM. To
test the vacuum register, a two byte pattern is written into it. The first byte is the
real data and the second byte is used to retrieve the feedback.
3.2.3.8 DAC Register Test
To test the DAC register, a two byte pattern is written into it. The first byte is the
real data, and the second byte is used to retrieve the feedback.
3-6 Diagnostics