SQF-4-17
Trouble-
shooting
12 February 2007
4.4 TEST POINTS
+UNREG: Outgoing unregulated 36V, after interlock. Measure between Test Point
+UNREG and Test Point GND/PGND using a voltmeter. The voltage will be shown
on the voltmeter unless:
- Voltage is outside allowed range 29-43V. Voltage will be 0V.
- Machine is interlocked (i.e the top cover is open). Voltage will be 0V.
VCC:Stabilizedandrectied5Vmadefromincoming10VACfromtransformer.
Measure between Test Point VCC and Test Point GND/PGND using a voltmeter.
The voltage will be shown on the voltmeter. Range 4.9-5.1V.
GND / PGND: Ground /Power Ground is the negative reference when measuring
either unregulated 36V (+UNREG) or 5V (VCC).
TEST POINTS
GND/
PGND
VCC
+UNREG
CAUTION
ESD Hazard! ESD (Electrostatic Discharge) can cause software crashes,
data and/or communications problems. Failure to use proper ESD pro-
cedures will cause damage to electronic components (example: PCBs).
ESD problems can be minimized by maintaining all machine ground con-
nections, ensuring the proper handling of circuit boards and sensors. Use
ESD protection when working near PCBs. Failure to use ESD protection is
likely to result in a PCB failure ( Service Manual BM 200 3.1 ).
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