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Computer System
Electrical
Troubleshooting Guide
IRB-6400 M94A
2.4.3 Memory Board DSQC 317/6 Mb (DSQC 321/4Mb)
Designation Color Description
F Red Turns off when the
board approves the
initialization.
The expansion memory, which is battery-backed, is an
extension of the main computer's memory.
The communication between the main computer and
the expansion memory takes place over a specific
memory bus in the backplane from which the board is
also supplied. Only one signal is carried over the VME
bus (the upper connector), namely VSYSRESET-N.
The board has an LED, 'F', which is lit and turned OFF
by the main computer. If the LED is lit, the board
probably has a fault.
It is not possible to carry out diagnostics on the board
in the operation environment and, thus, if the expansion
memory is faulty, it must be replaced.
If the Memory board is to be replaced, the new board
must go in the correct slot (see Figure 2-4). The
system software will have to be loaded. Then the
system parameters will have to be loaded. And then the
resolver counts need to be updated. Refer to Chapter
3 - Loading System Software for procedures.
DSQC
317/321
Fig. 2-4 ..............
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