Upper Circuit Board; Diagnostic Mode - Dometic RM2607 Service Tips Manual

UPPER CIRCUIT BOARD

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.
With main ON/OFF switch on display panel in OFF position:
Check for DC voltage at Plug 1, Terminal 4 (orange or white wire) and terminal 5 (red wire) negative (-)
DC on the lower circuit board. If no voltage, then check fuse condition.
Check for DC voltage between J4 and J10 terminals on the lower circuit board.
Next, check for DC voltage at the upper circuit board between terminal 4 (orange or white wire) and
terminal 3 (red) which is negative (-) DC. If no voltage, and your previous check proved voltage at the
lower circuit board between these wires, replace the cable assembly.
With main ON/OFF switch on display panel in O N position:
Check for DC volts between terminal 3, red wire (-) negative and terminal 5 (green wire) and termi-
nal 1 (black wire). If there is no voltage, the ON/OFF switch on upper circuit board is defective.
Do the same voltage test at the lower circuit board. (-) negative plug 1, terminal 5 (red wire), 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.

DIAGNOSTIC MODE

Access to the diagnostic sequence unit: With the Power Switch in the OFF position, hold the Tem-
perature 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 Tempera-
ture Selector Switch DOWN for three (3) seconds.
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.
All of the checks listed below are done on the lower circuit board.
The manual test sequence is as follows:
#l :
Position 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: Activate DC heater. Check for DC volts between J1 (+) and J10 (-).
Position #5: Activate spark ignition system. Check for DC volts to (+) terminal of igniter and ground.
UPPER CIRCUIT BOARD
RED 3
ORANGE OR WHITE 4
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