Dometic RM7732 - Manual (Page 14)

11
DIAGNOSTIC SERVICE MANUAL
DOMETIC® RM7030/RM7732
Refrigerators
Next, hook up a manometer at
the test port. Then
check for DC volts at
gas valve terminals
while the unit is in
trial-for-ignition. If DC
volts are present and
pressure is low,
replace the valve. If DC
volts are not present at
the valve while unit is in
trial-for-ignition, verify that the wires at Plug 3,
Terminal 1 and 2 on lower circuit board have DC volts
(9 or more). If the valve chatters, check for low input
voltage to the valve (below 9V DC).
5.5 IGNITER
A. RM7030 (Product No. 921890201 & 921890301)
The igniter is an electronic device that produces high
voltage to create a spark at the burner, only on gas
mode. It also produces an increased DC voltage at the
"L" terminal which is a signal to the circuit board that a
spark has been produced. First verify proper voltage at
the positive (+) and ground (–) terminals. The reading
should be within one volt of incoming voltage at the
main terminal block. A voltage drop of more than one
volt would indicate a loose connection (see Sec. 8.2) or
a circuit board problem (see Sec. 5.9A to 5.9D).
Next, disconnect DC power at refrigerator terminal
block. Remove high voltage cable from igniter. Recon-
nect DC power – the igniter should produce sparking
sound. If not, replace the igniter. With the igniter pro-
ducing spark, connect meter leads to "L" and ground (–)
terminals on the igniter, with the meter set on 20 volts
DC range or lower. The meter should read a pulsating
voltage. If not, replace the igniter.
NOTE: If a spark is not
produced within 10
seconds, the gas flame
warning lamp will illumi-
nate. If spark is produced
it will take 3 minutes for
lamp to illuminate.
If all of the previous
checks are correct, the
igniter is good – do not
replace.
B. RM7030 (Product No. 921890401) and RM7732
The igniter is an electronic device that produces high
voltage to create a spark at the burner, only on gas
mode.
First, verify proper voltage at the positive (+) and
ground (–) terminals. The reading should be within one
volt of incoming
voltage at the main
terminal block during
trial-for-ignition.
If no voltage is
present, see Sec.
5.9E to 5.9G.
Next, disconnect DC power
at refrigerator terminal block.
Remove high voltage cable
from igniter. Reconnect DC
power, the igniter should
produce a sparking sound
during trial-for-ignition. If not,
replace the igniter.
5.6 HIGH VOLTAGE CABLE
A. RM7030 (Product No. 921890201 & 921890301)
Disconnect DC power at the refrigerator terminal block.
Disconnect high voltage cable from electrode. Recon-
nect DC power. If sparking starts, cable is good (see
Sec. 5.11). If no sparking, disconnect DC power. If
sparking sound from igniter, then replace high voltage
cable.
B. RM7030 (Product No. 921890401) and RM7732
Disconnect DC power at the refrigerator terminal block.
Disconnect high voltage cable from electrode. Recon-
nect DC power. If sparking starts during trial-for-ignition,
the cable is good (see Sec. 5.11). If there is no sparking
during trial-for-ignition, disconnect DC power and
disconnect high voltage cable at the igniter. Reconnect
DC power. If there is a sparking sound from the igniter
during trial-for-ignition, then replace high voltage cable.
HIGH VOLTAGE