Hoshizaki dcm-75ibah service manual Service Diagnosis, Ice Production Check, Diagnostic Procedure

B. Service Diagnosis

WARNING

•The appliance should be diagnosed and repaired only by qualified service personnel to reduce the risk of death, electric shock, serious injury, or fire.

•Risk of electric shock. Use extreme caution and exercise safe electrical practices.

•Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

•CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are securely in place after the appliance is serviced. Make sure that none have fallen into the storage bin.

•Make sure all food zones in the appliance are clean after service. For cleaning procedures, see the instruction manual or the maintenance label.

1.Ice Production Check

To check production, prepare a bucket or pan to catch the ice and a set of scales to weigh the ice. After the appliance has operated for 10 to 20 minutes, catch the ice production for 10 minutes. Weigh the ice to establish the batch weight. Multiply the batch weight by 144 to calculate 24hr production. When confirming production or diagnosing low production, see "VIII.B. Performance Data."

2. Diagnostic Procedure

This diagnostic procedure is a sequence check that allows you to diagnose the electrical system and components. Before proceeding, check for correct installation, proper voltage per unit nameplate, and adequate water supply. Check that the 24VAC 1A fuse and GM 115VAC 3A fuse are good. When checking high-voltage (115VAC), always choose a neutral (W) to establish a good neutral connection. When checking low‑voltage (24VAC), always choose a neutral (LBU) from CT to establish a good neutral connection. When checking CB DC-voltage (5VDC), use CB red K4 connector pin closest to CB black K3 connector for DC ground (GND). CB "POWER" LED remains on unless power supply is interrupted. Check CB using the steps in "II.C. Control Board Check."

IMPORTANT! Appliance will not start unless the safety switch is engaged.

1)Turn on the power supply. Remove the front panel. Move the power switch to the "ON" position, then move the control switch to the "DRAIN" position. Engage the safety switch.

2)Allow the water system to drain for 5 minutes. If water does not drain, see step 12.

3)Disengage the safety switch, then move the control switch to the "OFF" position.

4)Move the power switch to the "OFF" position.

5)Remove the control box cover.

6)Engage the safety switch.

13