Presto Detacher
™
© 2012 AIC WAIKATO LLC
608-526-6882
51
Symptom
Probably Cause
Solution
Meter fails to register milk
Dirty Sensing Probes
Clean Probes using the same
procedures as pipeline cleaning
Meter Reads High or Low
Insufficient Claw Air Admission
Check the Claw for either to much Air
admission of not enough. (Check Air
Bleeds, Cracked Liners, Cracked
Claw Top
Milk yield too low
Adjustment is required
Move pointer in direction
“MAKE METER READ HIGHER”
Milk yield too high
Adjustment is required
Move pointer in direction
“MAKE METER READ LOWER”
Display flickers while milking
Insufficient power (usually on
pulsator power)
Ensure ample supply power by using
bridge rectifier
Very inaccurate milk yield
cannot get yield adjustment to
read correct volume.
Calibration is required
Have dealer calibrate
Or Refer to Manual
Too many false indications of
high Conductivity
Incorrect Conductivity offset
Increase Conductivity OFFSET
Ignores high Conductivity cows
Incorrect Conductivity offset
Decrease Conductivity OFFSET
Detach occurs too soon
Incorrect setting
Increase TAKEOFF TIMING or
decrease TAKEOFF FLOWRATE
Detach occurs too late
Incorrect setting
Decrease TAKEOFF TIMING or
Increase TAKEOFF FLOWRATE
Temperature Displays --
Open Circuit
Isolate the problem by removing the ’s
cover and shorting the white/black
sensor wires. If the display turns to ++
the PCB is working fine and the Flow
cell is bad. If – stays on the display
the PCB temperature sensing circuit is
bad.
Temperature Di+
Closed Circuit
Isolate the problem by removing the ’s
cover disconnecting the white black
sensor wires. If the display turns to --
the PCB is working fine and the Flow
cell is bad. If ++ stays on the display
the PCB temperature sensing circuit is
bad.
Yield readings are correct after
washing and change to inaccu-
rate as milking progress.
Build up is occurring on sensor
probes.
With VOM Meter set on AC, measure
across the red/green wires from the
PC board to the flow cell. The reading
should be 4.5 to 6 AC volts. Measure
for DC current as well, less than 10
mV DC should be present. If the rang-
es are incorrect, it is likely the sensing
circuit output is not correct.
Trouble Shooting Guide