Dometic
®
MANUAL
Refrigerators
51
Check for DC voltage between J4 and J10 terminals on
the lower circuit board. If fuse is good and there is
battery voltage at J4, remove and replace 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. If DC
volts are present, proceed to the next check.
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), 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.
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.
NOTE: Each of the following tests should be done
according to pin locations. The wire colors may
vary.
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. Replace if blown.
UPPER CIRCUIT BOARD
13D. 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
THERMOCOUPLE
The thermocouple is a component extending above the
burner assembly so the tip is in the path of the flame.
During normal gas operation, the thermocouple should
produce 25 to 35 millivolts when connected to the lower
circuit board. Any reading below 18 millivolts could
cause erratic gas operation. NOTE: A reading of 18 or
less could be caused by low gas pressure or improper
thermocouple location.
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