No Display Condition | ADC ML-96 instruction

ADC ML-96 No Display Condition, Drive motor reverses but does not forward, blower motor runs

1.No Display Condition

a.Check position of “EMERGENCY STOP” (E-Stop) to verify it is in operating position (pull or twist for operating position).

b.Check fuse one or two and if either are blown, replace.

c.Take voltage reading across the microprocessor (J7) 9-pin connector pins 1 and 2. If no voltage is present at pins 1 and 2, double check the secondary (24 VAC) side of transformer at the blower motor contactor number 13 to ground if no voltage is present check primary voltage to transformer.

d.Check voltage across fuses 1 and 2 to ground. If voltage is present, check “EMERGENCY STOP” (E-Stop) “red” and “black” wire to ground. If voltage is present, check voltage across 95 and 96 to ground of the drive motor overload. If voltage is present, check 95 and 96 to ground of the blower motor overload. If voltage is present and transformer terminations are good, then the transformer is faulty. Refer to the schematic supplied with the dryer to assist in the troubleshooting of the dryer.

NOTE: In this next section ALL voltage checks must be done in the operating mode with the appropriate microprocessor dot on. Also appropriate L.E.D. (light emitting diode) output light on.

NOTE: In this next section when checking for voltage you are looking for 25AC volts unless otherwise specified.

2.Drive motor reverses but DOES NOT forward, blower motor runs

a.If computer dot (first dot on the left) does not come on replace the computer.

b.Check for voltage across the coil of the forward contactor located in the reversing panel box. The contactor according to your diagram is marked CR2. The coil markings A1 and A2.

If voltage is present, replace reversing contactor.

If voltage is not present, there is a faulty wire or termination between BS2 and contactor coil (CR2).

c.If there is voltage across the two AS2 terminals and no voltage across the two BS2 terminals, replace the arc suppressor (A.S.) board.

If there is no voltage across the two AS2 terminals on the arc suppressor (A.S.) board, the problem is a faulty wire or termination between the AS2 board and the J7 9-pin computer connector no. 8 or faulty computer.

3.Drive motor works in forward mode but DOES NOT reverse, blower motor runs

a.If computer dot (second one from left) does not come on, check program to see if set for reverse.

b.If set for reverse, replace computer.

c.Check for voltage across the coil of the reversing contactor located in the rear panel box. The contactor according to your diagram is CR3, also the markings on the coil are A1 and A2.

ML-96 specifications

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