Tuttnauer 2540 EHS, Technician Manual

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93
Corrections
12.1
Correct any problem with the tap water inlet
12.2
Replace faulty float switch.
12.3
Replace blown fuse.
12.4
If the pump will not rotate feely then replace the pump
12.5
Replace the DIG-T2 board
12.6
If approximately 120VAC is present then the pump is faulty and should be replaced. If no voltage is present then replaced the AC-T1 board.
12.7
Clear any clog and / or replace the filter or valve. Once the pump has cooled it will start working again.
Possible cause check-up and tests
12.1
Check that the vacuum pump reservoir is full and tap water will flow in freely.
12.2
The lower float in the vacuum pump reservoir may be faulty, stopping the pump.
12.3
Check the fuse at the rear of the unit.
12.4
With the power off, check if the pump is free to rotate. Do this by inserting a flat blade screwdriver into the center of the rear bell housing engaging a slotted screw that is present there. Apply moderate force, if the pump will not rotate then continue increasing force until the pump rotates freely.
12.5
Check TP5 if the voltage is constantly <1VDC then the problem in on the DIG- T2 board.
12.6
If the voltage at TP5 is higher than 4DC, then remove the JP7 connector and check the output of JP7-1 on the AC-T1 board to ground.
12.7
If the pump has over heated the thermal protector will activate and stop the pump, this can be due to a clogged or malfunctioning chamber filter screen, vacuum pump feed water valve (15) or chamber vacuum valve (52).
10. TROUBLESHOOTING
(cont.)
10.4
In Process Malfunction
(cont.)
Symptom
12.
Vacuum pump does not work.