INFICON MDC-370 Thin Film Deposition Controller - Manual (Page 164)

MDC-370 DEPOSITION CONTROLLER
CAUTION
Remove AC line power before disassembling the controller to avoid
electrical shock.
12.3 TROUBLE SHOOTING AIDS
Symptom Possible Cause
Unit blows line fuse. a) Line voltage selection card is not
installed to agree with line voltage
being used.
b) Incorrect fuse size.
c) Shorted rectifiers in power supply
area.
d) Shorted transformer or filter
capacitor.
Front Panel display never illuminates. a) Blown fuse.
b) Faulty clock generator (High Speed
Counter board)
Parameter/Status display shows a
blank blue screen a) Contrast level is set too low.
b) Bad Front Panel Logic board.
c) Bad LCD display.
“Crystal Failure” message flashes
with selected sensor properly
connected. a) Defective cable or cables.
b) Defective or overloaded sensor
crystal.
c) Oscillator unit connected in the
wrong direction.
d) Bad Oscillator unit.
No control voltage while monitoring
output of selected Source/Sensor bd. a) Cable/connector miswired or
shorted. (Source/Sensor board)
b) Bad Source/Sensor board.
Front panel control keys non-
functional. a) Defective membrane keys
b) Bad Front Panel Logic board
Unit does not retain programmed data
in memory. a) “Power up” or “Power down”
sequencing circuit malfunctioning.
b) “RAM Power” switching circuit
not functioning.
c) Aged or defective batteries.
d) Bad Main Processor board.
The unit fails to activate externally
controlled devices (Shutters,
solenoids, etc.) a) Faulty Relay (Discrete I/O board)
b) Bad Discrete I/O board.
Unable to remotely control the unit
via Discrete I/O inputs. a) Improperly wired cable/connector.
b) Inputs not properly grounded.
c) Bad Discrete I/O board.
Unable to manually control the source a) Controller is not in Manual mode.
REPAIR AND MAINTENANCE 12-2