ZF MM9000, Installation, Operation And Troubleshooting Manual

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EN 3340.758.003a - 2014-11
TROUBLESHOOTING
MM9000 Rev C.8 01/13 Page 152
MM9000 ClearCommand User Manual
Troubleshooting
10.5.2.2 One Long, One Short - High Repetitive Rate Tones
This tone is also referred to as a Jam Tone . When sounded, Servo 1 is unable to reach the commanded
position. In most cases when a Jam Tone is encountered, it can be cleared by moving the Control
Head lever back to the point prior to where the tone was first encountered.
The tone will be accompanied by Error Code
62 and is typically caused by one of the following reasons:
• Stiff or frozen selector lever.
• Mis-adjusted push-pull cable.
• Defective push-pull cable.
• Low battery voltage.
• Defective Processor.
In order to isolate the cause to one of these five items, follow the steps below:
A Disconnect the push-pull cable from the selector lever.
B Move the Control Head lever to Ahead, Astern, and back to Neutral.
• If the tone ceases continue with step C.
• If the tone is still present, skip ahead to step D.
C Grab a hold of the selector lever and manually reposition the lever.
• If the selector lever is very stiff it needs servicing.
• If the selector lever moves freely, the push-pull cable’s travel is mis-adjusted
and needs to be corrected.
D If the tone did not cease in step B, remove the push-pull cable from the Processor.
E Move the Control Head lever back and forth from Neutral to Ahead to Astern.
• If the tone ceases, the push-pull cable is defective and needs to be replaced.
• If the tone did not cease, check the DC Voltage to the Processor by accessing
the Diagnostic Menu H0 . If the voltage is adequate, replace the Processor.
10.5.3 Servo 2 Control System Tones
10.5.3.1 One Long - Two Short Tones
This tone indicates that the feedback signal, which represents the position of the Servo 2 cross-bar, is
out of expected range.
This tone will be accompanied by Error Code
66
or
67
.
• If Error Code 66 is displayed, the signal received from the feedback potentiometer is higher
than expected. This is due to one of the three following reasons:
1. The orange wire (ground) between the potentiometer and plug are not
making contact, or have a high resistance contact.
2. The potentiometer is out of calibration.
3. The potentiometer is defective.
• If Error Code 67 is displayed, the signal received from the feedback potentiometer is lower
than expected. This is due to one of the following reasons:
1. The green (signal) or orange (reference voltage) wires between the
potentiometer and plug are not making contact or have a high resistance
contact.
2. The potentiometer is out of calibration.
3. The potentiometer is defective.
4. The Control Circuit is defective.
The Servo 2 feedback signal can be viewed within the Diagnostic Menu. The Value displayed depends
on the direction and amount of push-pull cable travel. As a general rule:
• When the Value displayed is 1023 or 0 , the problem is with the wiring between the
potentiometer and plug.
• If the displayed Value varies, the potentiometer is defective.
• When the Value is slightly too high or too low when fully extended, the potentiometer
requires calibration.