Electrical
Troubleshooting Guide
IRB6400 M94A
Page 2 - 14
Computer System
2.4.4 Power Supply Unit DSQC 258
Designation Color Description
F Red Unlit: All supplies are
within the appropriate
limits (or there is no
main supply).
Flashing: Short-
circuited +24V.
Lit: +5V, +15V or -15V
is short-circuited.
The Power Supply Unit is the source of power for the
computer boards. The DC voltages go through the back
plane. The Power Supply is short circuit protected.
Which means that if any of the outputs are shorted, the
power supply will drop the voltage until the short is fixed.
The DC voltages can be checked with a digital
multimeter. There are no dedicated test points for these
voltages. However, the following are suggested places
to check these voltage levels:
Voltage Checkpoint
+5 VDC Back of power supply GS1.XP1 pin D32.
+15 VDC Only able to check if an analog I/O board is
used. Check on XT10 terminals 19-24 or
on the front of a DSQC 209 board.
+24 VDC Check on XS3/XT3 terminal A16.
0 VDC XS3/XT3 terminal D16 or any metal surface
in control should be grounded and 0 VDC
If the Power Supply is replaced, there are no
adjustments or procedures necessary.
Sheet 6, line 19 ..............
Fig. 2-2 ..............
Sheet 21.1, line 13..........
Sheet 21.2, line 13..........
Sheet 6, line 01 ..............
Fig. 2-2 ..............
Sheet 6, line 16 ..............
Fig. 2-2 ..............
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