120 Volt Ac Heater Output Check; Ac Heater Resistance Check - Norcold 600 Repair Manual

19. With the volt-ohm-meter check
the three points (A, B and C)
indicated in Figure 11.31 for 12
volts DC. If you do not have 12
volts the cable is defective.
20. Set the Mode Selector to all
modes of operation. The 12
volts as indicated in Figure
11.31 should go to zero. If
they do not the Eyebrow
board is defective.
21. Set the Mode Selector to
AUTO.
22. Set the volt-ohm-meter to
measure 120 volts AC and
check the AC heater termi-
nals J6 and J7 as shown in
Figure 11.32. If you do not
have 120 volts, replace the
Power Supply.
23. Set the volt-ohm-meter to the
Rx1 scale and check the resis-
tance of the AC heater as
shown in Figure 11.33A. If the
measurement is not within al-
lowable specifications
Technical Data Section), re-
place heater. Next, check the
resistance between each Ter-
minal and the metal heater
sheath as shown in Figure
11.33B. The needle of the me-
ter should not move (high re-
sistance). Replace heater if
movement is observed.
A. Set volt-ohm meter to the
Rx10 scale or higher and
check the heater element
for a short to ground. The
meter should show
movement.
Cable and Thermistor connected
but not shown
Figure 11.31
AC and DC power con-
nected but not shown
Figure 11.32
(see
no
Figure 11.33
Control Voltage Check

120 Volt AC Heater Output Check

AC Heater Resistance Check

40
A
B C
Black Wires
Black Wires