Sharp MX-BMX1 (serv.man3) Service Manual ▷ View online
BF-4-15
Trouble-
shooting
20 October 2010
4.3 LED’S
D1: Yellow LED flashes when power is on. The flashing indicates that a program is
present and functioning. Should a download fail or the 5V be missing, LED would
be OFF.
D2: Red LED flashes whenever information is sent or received on the Internal CAN
(Central area network). If power is switched on but no operations are performed,
LED is OFF.
D15: Green LED permanently OFF. It has no direct function in this configuration.
LED’S
D1
D2
D15
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 (
3.1 ).
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BF-4-17
Trouble-
shooting
20 October 2010
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: Stabilized and rectified 5V made from incoming 10V AC from transformer.
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 (
3.1 ).
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