Hoshizaki AMERICA 73183 - Manual (Page 26)

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C. Control Module Check
1. Control Module with Remote Display Module
Before replacing CM that does not show a visible defect and that you suspect is
bad, conduct the following check procedure. This procedure will help you verify your
diagnosis. Always choose a neutral (W) to establish a good neutral connection when
checking high voltages. Also, confirm there is a good power supply and neutral
connection to CM: 115VAC at CM L3 (BK) to neutral CM N5 (W).
Alarm Reset: To silence an alarm, press and release the upper or lower button with
power on. For alarm information, see "III.D. Alarm Safeties."
NOTICE! When replacing the display module or control module on appliances with
a control module with remote display module, a conversion kit must be ordered:
Refrigerator: HS-5079; Freezer: HS-5078.
Startup/Cool Down
1) Check all wiring connections. Confirm DM cable, CTh, and DTh are properly connected.
2) Move the power switch to the "ON" position.
3) Check for 115VAC at CM L3 (BK) to CM N5 neutral (W). If 115VAC is not present, check
power supply, wiring connections, and power switch continuity.
4) Check that the cabinet temperature is displayed on DM. If not and DM cable is
connected, replace DM and CM with HS kit.
5) Freezer: Check that EvapFM is energized. Make sure doors are closed and DS
engaged. Next, check for 115VAC at CM F6 (BK) to neutral (W). If 115VAC is not
present, replace DM and CM with HS kit.
6) Check that Comp and ConFM energize. If not, check CTh status. See "II.D.Thermistor
Check." If CTh ohm reading is in proper range, check for 115VAC at CM C1 (R) to
neutral (W). If 115VAC is not present, replace DM and CM with HS kit.
Defrost
7)
Manual Defrost Check: Press and hold the lower button until "dEF" appears on DM.
8) Confirm Comp, ConFM, and EvapFM (freezer) de-energize. Check for 115VAC at CM
C1 (R) to neutral (W) for Comp and ConFM, then at CM F6 (BK) (freezer) to neutral (W)
for EvapFM. If "dEF" is displayed and 115VAC is present, replace DM and CM with HS
kit.
9) Freezer: Confirm DH energizes. Check for 115VAC at CM H4 (BK) to neutral (W).
If "dEF" is displayed and 115VAC is not present, replace DM and CM with HS kit.