Troubleshooting Timer Circuit Board

BASIC SERVICE

Solid State MH60/MH6N/MH6L Operating Instructions

Automatic Operation

1.Check that drain is closed and screens are clean and in place.

2.Turn on main power to the machine.

3.Flip machine control panel power switch to ON.

4.Close doors.

•Machine pauses 4 seconds to check water level.

5.Machine fills for 110 seconds if float is down.

6.Run machine through several cycles or wait for 10 minutes (on initial start up) for tempera- tures to stabilize.

7.Open door, insert rack of dishes.

8.Close doors. Automatic cycle begins.

9.Machine cycle is:

Wash = 48 secs. Dwell = 4 secs. Rinse = 8 secs.

10.Open door, remove clean rack of dishes.

11.Repeat for additional racks.

•If Extended wash switch is operated, then machine will wash continually until Extended wash switch is taken off. Machine will immediately enter rinse cycle if more than 49 sec- onds has elapsed. If less than 49 seconds has elapsed when the extended wash is ended, then the machine will complete the remaining wash time and then finish with a final rinse.

1.1 Introduction

The following procedures are for determining whether or not the timer circuit board itself is faulty.

In this part –

•Checking the general condition of the circuit board.

•Testing inputs.

•Testing outputs.

Special Tools

•A voltmeter capable of reading DC and AC volts.

1.2Checking General Condition

Before testing the inputs and outputs, you should first check that the board is receiving power.

Turn on the power switch to the unit (do not start the unit, just turn on power to the unit). If red “Power” LED on board is illuminated, go directly to Step 1.3. When LED is not illuminated, then check that the following conditions are true:

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