Dometic RM7732, RM7030 service manual Diagnostic Mode, Lower Circuit Board

YELLOW GREEN

6 PIN

DIAGNOSTIC SERVICE MANUAL

DOMETIC® RM7030/RM7732 Refrigerators

With main ON/OFF switch on display panel in ON position:

Check for DC volts between terminal 3 (red wire), (–) negative and terminal 5 (green wire) and terminal 1 (black wire). If there is no voltage, the ON/OFF switch on upper circuit board is defective. Replace the upper circuit board. If voltage is present, the ON/ OFF switch is good.

Next, do the same voltage test at the lower circuit board. Negative (–) plug 1, terminal 5 (red wire), to plug 1, terminal 1 (green wire) and plug 1, terminal 3 (black wire). If there is no voltage and you had voltage on previous test, the cable assembly is defective and you must replace it. If voltage is present, the ON/OFF switch on the upper circuit board and cable assembly is good.

DIAGNOSTIC MODE

NOTE: The PAL tester will allow for proper testing of the integrity of the upper and lower circuit boards. PAL is available from your Dometic parts distributor.

This control system has an integral Diagnostic/ Test sequence.

Access to the diagnostic sequence unit is by means of the ON/OFF Power Switch and the Temperature Selector Switch. With the Power Switch in the OFF position, hold the Temperature Selector Switch in the DOWN position. While keeping the Temperature Selector Switch in the DOWN position, move the main power ON/OFF Switch to the ON (DOWN) position. Hold the Temperature Selector Switch DOWN for three (3) seconds. The control will indicate that the diag- nostics have been entered by illuminating each of the Mode Indicator Lamps and the Temperature Indicator Lamps one at a time in sequence. Each lamp is illuminated twice. The Check Lamp will then flash ON and OFF and #1 position Tempera- ture Indicator will remain illuminated. The test sequence can be operated automatically or manually. For AUTO step sequence, press the AUTO/GAS Mode Selector Switch to the DOWN position. The AUTO Mode Indicator will illuminate.

If each lamp illuminates during the check, the display circuit board is good.

In automatic test mode, each load is activated for approximately four (4) seconds then released. The control system will automatically exit the diagnostic sequence in approximately four (4) minutes or when power is turned OFF.

The Temperature Indicator Lamps are used to indicate which part of the control system is being tested. When position #1 is illuminated, the control is in an idle position with all output loads off. To activate the first load simply push the Temperature Selector Switch.

All of the checks listed below are done on the lower circuit board.

The manual test sequence is as follows:

Position #1: Idle Position, all loads off.

Position #2: Activate AC Heater. Check for AC volts at terminals J7 and J8.

Position #3: Activate Gas Solenoid. Check for DC volts at Gas Solenoid white wire (-) and yellow wire (+).

Position #4: Idle position. All loads OFF.

Position #5: Activate spark ignition system. Check for DC volts to (+) terminal of igniter and ground.

If you experience a problem on any of the above checks, verify the fuses on the lower circuit board are good.

If all checks prove to be good, and the refrigera- tor does not operate on electric mode, replace the lower circuit board. It has been damaged by AC volts in excess of 180 volts.

5.9LOWER CIRCUIT BOARD

RM7030 (Product No. 921890201 & 921890301) The circuit board controls all modes of operation.

A.DC VOLTS

THESE PROCEDURES MUST BE FOLLOWED IN SEQUENCE AND AT THE PROPER TERMINALS OR DAMAGE TO THE BOARD WILL RESULT.

Before any checks are to be done, be

sure proper DC volts are to the board. Measure volts between yellow terminal

on the 6-pin connector (positive [+] lead from meter) to green terminal on 6-pin connector (negative [–] lead from meter). Voltage should be the same as at the positive (+) and negative (–)

terminal block. If not, check the fuse and wiring.

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