Assessments - 1, GPA: 5
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If the voltage is not present, check the transformer output. If the voltage is present and not within range, replace the power supply board and check the transformer output. If the voltage is present and within range, the power supply is operating properly. Option 2: Using a plastic handle screwdriver, short the high voltage contacts and observe a spark. Short the HV contacts to observe a spark. 8 Troubleshooting Guide e. Check the input voltage to the transformer using a standard lead and a multimeter. Check the voltage from the black lead on the terminal L speed control switch and white lead on power supply board labeled line neutral. Activate the interlock switch. The meter should indicate line voltage. Check the voltage on the two yellow wires on the power supply board from the transformer. The interlock switch must be activated. The meter must indicate 24 vac. BLACK LEAD YELLOW WIRES WHITE LEAD If there is no power to the transformer, recheck section 1, the interlock switch. If there is power to the transformer, but no output voltage, replace the transformer and power supply board assembly. 3. If the green “cleaning air” light operates and the blower wheel does not turn. a. Remove the top and check to see if the stripper is in place. The stripper is held in position by slots in the contact wall and bearing plate and alignment tabs on the stripper plate. If the stripper is not in position, reposition the plate by placing tabs into the slots. b. Use your hand to try to spin the blower wheel. If the wheel does not spin freely, check for anything that may be blocking the movement of the wheel and remove the blockage. If no blockage is apparent, see 3c and 3d c. Turn the unit over and check for signs of distortion in the cabinet bottom beneath the motor that might prevent the blower from spinning. If the cabinet bottom is distorted, replace the unit. 9 Troubleshooting Guide d. If there are no signs of distortion, remove the blower wheel (see: Blower Wheel Removal) and activate the unit. Notice if the motor shaft rotates without the blower wheel. If the motor shaft operates, the problem is related to the blower wheel. If the motor shaft rotates then replace the blower wheel drive grommet and bearing wall. If the motor shaft does not rotate, replace the motor. 4. If the motor shaft does not turn on all speeds, or seems sluggish, it may be due to a build-up of dirt and grime on the motor shaft. To remedy this. a. Clean the dirt and grime from the motor shaft using a soft cloth. Motor Shaft b. Squirt a few drops of lubricating oil (“3 in 1” type oil, not WD-40 type oil) in the slot on the shaft to lubricate the bearing. 5. If the blower wheel vibrates: a. Check for bent or warped blades. Replace the blower wheel if blades appear warped or bent. b. Check for loose or worn drive grommet. Replace the drive grommet. 10 Troubleshooting Guide c. Check to see if the blower wheel is adequately supported by the outside bearing plate assembly. The outboard end of the blower wheel should be firmly supported, allowing no movement other than rotation. If that end of the wheel can be moved front to back and up and down, remove the bearing plate assembly and check the bearing for damage or excessive wear. Replace parts as needed. Use care in handling the blower wheel. Do not distort the wheel blades. On reassembly, insert the outboard wheel shaft into the bearing plate then position the plate into the cabinet. The blower wheel should be positioned so that the clearance between the ends of the wheel and the adjacent walls are approximately equal on both sides. If the wheel is too close it may drag on the wall. Too much clearance at the outboard end may cause the wheel shaft to slip out of the outboard bearing. d. Check to see if the motor mounting bracket snap tabs are in place or are loose. Look into the four base slots to see the tabs. If the tabs are not in position, use a screwdriver inserted into slots to push the tabs out of the slot. You may need to twist the screwdriver slightly to disengage the snaps. Inspect the mounting bracket; replace it if damaged. Check for broken mounting tabs, distorted bracket (because of excessive heat). A distorted motor bracket normally indicates motor overheating. The motor should be replaced. e. Check to see if the motor is loose in the support bracket by holding the bracket and trying to move the motor. If the motor moves, remove the mounting bracket to check the isolator pads Insure that the isolator pads are in position. Replace if the motor moved while being held in place with mounting bracket. 11 Troubleshooting Guide If the cell is arcing, check the following: a. If there are loose or broken ionizer wires. Replace the cell. b. If the cell is dirty. Remove the cell and wash with warm soapy water. Dry completely before re-installing. c. If there are bent cell plates. Replace the cell by following instructions on inside of cabinet top. d. If the cell is improperly installed in the uni...
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