Plockmatic BM500 - RAP 042 Stepper Motor M301 PCB 48 V very Low

Plockmatic BM3050 system 27 August 2019 4. Troubleshooting (RAP)
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RAP 042 Stepper Motor M301 PCB 48V Very Low
This RAP is for troubleshooting a very low 48V related to Stepper Motor M301 PCB “G”.
The primary objective is to determine if the failure is related to the PCB or the harness.
Initial Actions
• Make sure that plugs/jacks P310/J310 and P312/J312 are properly connected
• Make sure that all connectors connecting to the Door Switch(S301/S302), REL301,
REL302, PSU (24V) and PSU (24/48V) are properly connected
• Ensure that all connectors to “A”, “B”, “C”, “D”, “E”, “F”, “G”, “H”, “J”, “K”, “L”, “M”, “N”, and
“O” PCBs are properly connected
Procedure
WARNING!
Turn off the VF602 Main Power Switch and disconnect the Main Power Cord before
disconnecting, removing or replacing any electrical components or measuring
resistance inside the machine.
Power off the machine, disconnect [C, P2], [D, P2] and [G, P9]. Measure continuity between
[G, P9] Orange and Black wires to [C, P2] and [D, P2]. Check for short circuits between
Black and Orange wires, also check for short circuits from Orange wire to chassis.
There is continuity and no short circuit
Y N
Repair/replace harness
Disconnect all connectors connected to PCB “G”.
Check for short circuits between [J9-1] to [J9-2] (PCB connector).
There is no short circuit
Y N
Replace PCB “G”
Keep connectors disconnected and disconnect M301 Motor Connector. Check for short cir-
cuits between all wires at [P7] and Motor connector (harness connector), between all wires
at [P7] to chassis and all wires at Motor connector (harness connector) to chassis.
There is no short circuit
Y N
Repair/replace harness
Swap the Stepper Motor M301 PCB “G” with Stepper Motor M101 PCB “K”, make sure
SW1 is correctly set and all connectors are properly installed at both PCBs before power on
the machine. Power on the machine.
Still “Stepper Motor M301 PCB 48V very low”
Y N
Replace the original Stepper Motor M301 PCB “G”
Exit
Image measuring points on page 4-328BSD’s on next page