Norcold 442 Repair Manual page 16

B101
WARNING
NEVER OVERFUSE A CIRCUIT.
REPLACE BLOWN FUSE WITH
EXACT REPLACEMENT INDICATED
BY NORCOLD. OVERFUSING OF A
CIRCUIT CAN RESULT IN A FIRE.
Note: Before gaining access to the
combination control, check
the AC Heater element as
described in Steps 14-18 on
pages 3-17 & 3-18.
3. We must now gain access to
the AC-ELEC STDBY-DC
switch. This procedure only ap-
plies to 3-way models. On 2-
Way models proceed to Step 8.
Remove the two knobs (A) and
the (6) Phillips head screws (B)
from the control assembly as
shown in Figure 3.34.
4. Remove the (2) Phillips head
screws as shown (C) and pull
the control mounting bracket
forward.
5. Set AC-ELEC STDBY-DC switch
to ELEC STDBY (not AC). With
a Volt-Ohm meter, check for
120 Volts AC at Point 1 shown
in Figure 3.35. Then check Point
2. One test point should read
120 Volts and the other should
read 0 Volts (the point which
reads 120 Volts is the switch in-
put terminal). This confirms volt-
age to the switch. If neither test
point reads 120 Volts, check for
bad connections.
6. Set AC-ELEC STDBY-DC switch
to AC; Mode Selector to ELEC;
Thermostat to COLDEST.
7. Check for 120 Volts at Point 1
and ground and Point 2 and
ground of switch as shown in
Figure 3.36. Normal readings
should show 120 Volts on both
terminals. If 0 Volts are read,
check wiring connections.
Figure 3.34 Access to Controls
Chassis
Ground
Figure 3.35 120 Volt Check at Switch Inlet
Chassis
Ground
Figure 3.36 120 Volt Check at Switch's Center Contacts
3-16
Rear View of AC-
ELEC STDBY-DC Switch
Rear View of AC-
ELEC STDBY-DC Switch