Norcold 121X series, Service Manual

Page: 15 / 100

S
ection
3
13
From page 12
66
• Loose or damaged wire terminals at
harness or circuit board connector.
• Repair as needed, then recheck for
voltage.
1. Connect the volt meter + probe to the Blue
wire and the – probe to the White/Violet
wire. See Figure 3-5, page 16.
2. Press and hold the OFF/ON switch button.
Voltage present?
Powers ON when the switch
button is released?
• Harness connected incorrectly to the
Optical Control Display circuit board.
• Loose or damaged terminals at wire har -
ness connector or circuit board connector.
• Repair as needed, then recheck for
voltage.
7
8
Voltage present with OFF/ON
switch button held pressed?
7a
Voltage across Green
wire & White/Violet wire terminals?
See Figure 3-4, page 16.
Optical Control Display overlay ribbon cable
plugged incorrectly. See Figure 3-6, page 16.
Controls okay
Go to page 14
NO
NO
NO
YES
YES
NO
Detach the Optical Control Assembly
from the divider and leave it connected to
the wire harness.
YES
Able to display and change
operation MODE?
8a
NO
YES
5
• Wire harness connector not
fully plugged in and locked
into P1 Power Board P1 con -
nector.
• Loose or broken wire termi -
nals.
• Repair as needed, then
recheck for voltage.
1. Plug wire harness connector back into
the P1 Power Board connector.
2. Check for voltage across the Yellow/
Green wire and Green terminals as
shown in Figure 3-3, page 15.
Voltage output?
NO
YES
YES
Fault in Optical Control Display overlay.
Replace Optical Control Display assembly.