Understanding Dispensing Circuit Diagram

flux

On this IDC board, I cannot identify ground by sight because there are no labels like GND / 0V / COM printed beside the connectors. You need to find it with the meter.
Use this method:
Method A: Find ground with power OFF
  1. Turn machine OFF.
  2. Set multimeter to continuity / beep.
  3. Put one probe on a known ground point, such as:
    • power supply terminal marked 0V, COM, GND, or V-
    • metal chassis only if it is bonded to DC ground
    • negative leg of a large electrolytic capacitor on the main board, if you know it
  4. Touch the other probe to each pin on the IDC board connectors.
The pin that beeps is the IDC ground.
Method B: Use the capacitor on this IDC board
This board has an electrolytic capacitor labeled C2 on the right side. The capacitor can help you find ground.
Electrolytic capacitors usually have a stripe marking the negative side. The negative lead often connects to ground.
So:
  1. Look at the black capacitor C2.
  2. Find the side with the stripe / minus marking.
  3. With power OFF, check continuity from that negative capacitor leg to the connector pins.
  4. Any connector pin that beeps to the negative capacitor leg is likely ground.
Do not rely only on this until you confirm it with continuity.
Method C: Find it at the sensor connector
Most position sensors use 3 wires:
Text
V+
GND
Signal
If the same pin position on all J1-J10 connectors connects together, that common pin is likely GND or V+.
Use continuity mode:
  • One pin position will connect to the negative side of C2: likely GND.
  • One pin position may connect to the positive side of C2: likely V+.
  • The remaining pins are individual sensor signals.
After finding ground
Power ON, set meter to DC volts:
Text
black probe -> ground pin
red probe -> other pins
Expected readings:
Text
V+ pin: steady 5V, 12V, or 24V
signal pin: changes when actuator sensor is triggered
ground pin: 0V
Best first target: use the negative side of capacitor C2 as your ground reference, then verify it connects to one pin on every J connector.
Test C2 ground
Measure J connector
Trace P10 pins
Diagnose intermittent fault
Create troubleshooting diagram
No schematic yet

Talk to Flux to get started.

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