Chamberlain SL 1000-XI - Manual (Page 22)

Rev C Doc 6001194 (01-20259) 19 of 36
PART 4
TROUBLESHOOTING AND MAINTENANCE
A. TROUBLESHOOTING
This section is designed to help you troubleshoot your unit(s) with a minimum of effort. Directly below
are some hints to help you test, then a list of problems in order of most severe to least. Next comes a
quick-reference list of faults and how to clear them, and then a list of faults and their causes.
Testing Control Board inputs: To test an input, connect the input terminal to the COMMON
terminal on the Control Board and verify that its LED turns on momentarily. Normally, the Close
limit switch and Maglock LED's are on if the gate is fully closed, and Open limit switch is on if
the gate is fully open.
Low input AC voltage: The voltage across connector J3 pins 1 (red wire) and 3 (white wire)
on the Control Board must measure 100VAC to 130VAC.
CAUTION HIGH VOLTAGE. Measure with care.
Fault Causes: Refer to the end of trouble shooting section.
1. OPERATOR IS DEAD
When the unit power switch is turned on, the 7-segment display does not sequentially
spell out "HELLO".
1. The main circuit breaker is off.
2. The unit power switch is off.
3. The input power connector is not connected securely to the Control Board.
4. Low input AC voltage.
5. Bad Control Board.
2. OPERATOR DOES NOT RUN
When the unit power switch is turned on, the 7-segment display sequentially spells out
"HELLO".
1. An input is continuously activated (stuck).
2. Both limit switches are stuck closed.
3. Wrong switch S1 setting.
4. Stalled motor.
3. MOTOR DOES NOT RUN
Motor is dead:
1. The resettable motor thermal overload switch has popped.
2. The interconnecting cable between the motor and the control board is disconnected.
3. Bad control board.
4. Bad motor.
Motor is stalled:
1. Frozen motor, gearbox or gate.
2. V-belt is too tight.