1.8 RTI Service Issues
1.8.1 RTI MIB Tests
Normal measurements, measured on MIB J6 8 pin connector with
everything connected.
AC voltage measurements:
Pin 1 to Pin 2 - 24 VAC.
Pin 2 to Pin 3 - 24 VAC when RTI add pump is on, 0 VAC when it is off.
Pin 4 to Pin 5 - 24 VAC when RTI waste valve is on, 0 VAC when it is off.
Pin 6 to Pin 7 - 24 VAC when RTI JIB valve is on, 0 VAC when it is off.
DC voltage measurements:
Pin 1 to Pin 8 - 0 VDC when waste tank is full, 5 VDC when it is not full.
Troubleshooting.
The valves and pump should be off while MIB is resetting, 5 seconds or so after a power on or after
pressing the reset button; if any are on during reset then the MIB board is bad or wires are shorted.
If JIB valve is not opening:
Measure when JIB valve should be opened:
1. Voltage at MIB board from Pin 1 to Pin 2, should be 24 VAC; if not then check connections from RTI
24VAC transformer and check transformer.
2. Voltage at MIB board from Pin 6 to Pin 7, should be 24 VAC; if not then MIB board is bad or wires to
JIB valve are shorted or both.
3. Voltage at JIB valve, should be 24 VAC; if not then check wiring from MIB board.
If Waste valve is not opening:
Measure when Waste valve should be opened:
1. Voltage at MIB board from Pin 1 to Pin 2, should be 24 VAC; if not then check connections from RTI
24VAC transformer and check transformer.
2. Voltage at MIB board from Pin 4 to Pin 5, should be 24 VAC; if not then MIB board is bad or wires to
Waste valve are shorted or both.
3. Voltage at Waste valve, should be 24 VAC; if not then check wiring from MIB board.
If Add pump is not operating:
Measure when Add pump should be on:
1. Voltage at MIB board from Pin 1 to Pin 2, should be 24 VAC; if not then check connections from RTI
24VAC transformer and check transformer.
2. Voltage at MIB board from Pin 2 to Pin 3, should be 24 VAC; if not then MIB board is bad or wires to
pump relay are shorted or both.
3. Voltage at Add pump relay, should be 24 VAC; if not check wiring from MIB board.
Waste full signal:
Pin 1 to Pin 8 should be 0 VDC when full, 5 VDC when not full; if no level change, then bad
connection from RTI switch or MIB board is bad.
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