Product manual

Troubleshooting
5-8
Part 1105120-01
E 2013 Nordson Corporation
Diode Block Testing
WARNING: Shut off power to the system controller, allow the capacitors
time to bleed off voltage, then remove the diode blocks from the controller
before performing the following tests. Failure to observe this warning can
result in equipment damage or personal injury.
There are two diode blocks in the system controller. Each diode block
contains 4 high voltage rated diodes connected in a bridge network.
Diode 1 Connection: HV− and AC-1 (Anode to HV−, Cathode to AC-1)
Diode 2 Connection: HV− and AC-2 (Anode to HV−, Cathode to AC-2)
Diode 3 Connection: AC-2 and C (Anode to AC2, Cathode to C)
Diode 4 Connection: C and AC-1 (Anode to AC1, Cathode to C)
Pin 1
TP−
TP+
FB
AC-2
AC-1
C
GND
HV−
Figure 5-1 Diode Block Terminals and Connector Pins
Tests:
GND to pin 1 1005 ohm 1%
GND to pin 2 short, less than 0.2 ohm
GND to pin 3 20,000 ohm 1%
GND to pin 4 short, less than 0.2 ohm
GND to pin 5 open, over 20 M ohm
GND to pin 6 open, over 20 M ohm
GND to pin 7 open, over 20 M ohm
GND to pin 8 open, over 20 M ohm
GND to pin 9 open, over 20 M ohm
GND to pin 10 open, over 20 M ohm
TP− to pin 2 short, less than 0.2 ohm
TP− to TP+ 200 ohm 1%
C to FB 1000 ohm 1%
C to GND 4.9 ohm 1%