Plockmatic BM3050 system 27 August 2019 4. Troubleshooting (RAP)
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RAP 034 PSU (12V)
This RAP is for troubleshooting the 12V circuit.
The primary objective is to determine if the failure is related to the primary circuit, PCB “B”
or PSU (12V).
Initial Actions
• Ensure that plugs/jacks J/P309, J/P312, J/P111, J/P311, J/P23, J/P24, J/P111X, J/P211X,
J/P125 and J/P211 are properly connected
• Ensure that all DIP switch settings on PCBs “A”, “G”, “H”, “L”, “K”, “CC”, “Y” and “O” are
correct (See GP’s).
• Ensure that all connectors to SW1, PSU (12V) and “A”, “B”, “G”, “H”, “K”, “L”, “O”, “CC”
and “Y” 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.
WARNING!
Use caution when making the voltage measurements and always disconnect the
Power Cord when it is necessary to work inside the Power Module. AC Power is pre-
sent in the Line Module whenever the Power Cord is plugged into the Wall Outlet.
Power on the machine. Measure VAC between L to N on PSU (12V)
The voltage is between 90-264VAC
Y N
Power off and disconnect the Power Cord, check status of F1 located in the
power inlet.
F1 is blown
N Y
Go to RAP 031 F1 Blown Fuse
Keep the machine off and Power Cord disconnected. Measure continuity between
L Black1 wire to SW1,4 and between N Black2 wire to SW1,1.
There is continuity
Y N
Repair/replace harness
Keep Power Cord disconnected set SW1 to on. Measure continuity between
SW1,4 to SW1,5 and SW1,1 to SW1,2.
There is continuity
Y N
Replace SW1
Keep the machine off and Power Cord disconnected. Measure continuity between
SW1,5 Black1 wire to POW,1 and SW1,2 Black2 wire to POW,4.
There is continuity
Y N
Repair/replace harness
Replace the Power entry
Power off, disconnect wires from V- and V+ at PSU, power on.
Measure VDC between V- to V+ at PSU (12V).
The voltage is 12VDC±10%
Y N
Replace PSU (12V)
Power off, keep wires from V- and V+ at PSU (12V) disconnected and disconnect [B, P1].
Check continuity between all wires from V- and V+ to [B, P1], check short circuits between
Black to Red wires and between Black and Red wires to chassis.
There is continuity and no short circuit
Y N
Repair/replace harness
Replace PCB “B”
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