Hoshizaki HFE-140B Series, Руководство по обслуживанию

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4. CONTROLLER BOARD
[a] SERVICING CONTROLLER BOARD
) If receiving a service call, ask the user to turn off the power supply and turn it back on
after 30 seconds, while watching the unit. This will reset the controller, and in some
cases normal operation will resume.
2) Keep the following in mind when servicing the Controller Board:
* Check that the unit has been earthed properly. If not, the Controller Board will not work
properly.
* To get static free, always touch the cabinet (earth) before servicing. Electrostatic
discharge will cause severe damage to the Controller Board. Also, keep it away from
vinyl, plastic or other electrostatically charged products.
* Do not touch the reverse side of the Controller Board and tiny electronic devices on it.
* The Controller Board and Thermistor can be replaced separately.
* Handle the Controller Board by the edges only. Do not push the electric parts and wires.
* Do not drop the Controller Board on the floor.
* To protect the pattern from damage, place the Controller Board on a flat surface.
* The Thermistor and Pressure Switch leads have a thin coating and potentially breakable.
Do not tension the leads.
* The connectors must not be subjected to tension to prevent disconnection or breakage.
After servicing the Controller Board, check for disconnected connectors.
* The Thermistor is provided with single-wire leads. Do not bend or stretch them (about
400 mm from the end and at lead connections).
* Do not pinch or weigh down the Thermistor and Thermistor leads. The coatings may be
broken, resulting in a short circuit.
* Keep the Thermistor and Relay Box wires at least 30 mm away from the high voltage
(00V AC or more) wires.
3) After replacing the Controller Board, make the following settings:
* The replacement Controller Boards are shipped without model setting. To prevent
malfunction and failure, be sure to finish model setting before use according to “II. 6. [e]
MODEL SETTING AT CONTROLLER BOARD REPLACEMENT”.
* Some buttons on the replacement Controller Boards may be unnecessary for some
models. Proper model setting will disable those buttons.