Norcold 121X series, Service Manual

Page: 19 / 100

S
ection
3
17
100 B
ANS
I
Z21. 2
JW5
P3
R
T424F12
12V
05-43
07
3
D5
R50
R49
07
3
07
3
07
3
4
C
Q3
4
C
D8
CPC - E
94 V - 0
P4
GND
12VDC
Potter & Brumfield
T7CS1D2-05
5VDC
0544
700514
5A@120VAC
CHINA
D3
c
4
D6
3
07
R28
R
3
D13
07
3
R39
D1
N
M
07
3
1237
0301
9
8
4
5
3
K3
R25
R27
R26
R29
C8
7
4
R
1
2
Potter & Brumfield T77V1D10-09
CHINA CHINA
10A@120V
AC
700514
10A@120V
AC
Potter & Brumfield T77V1D10-09
30VDC RES.
30VDC RES.
700514
D4
R37
R34
4 6 5
D 12
D
11
Z3
C 1
Potter & Brumfield T77V1D10-09
CHINA
10A@120V
AC
30VDC RES.
700514
JW4
JW6
D2
R9
R7 R24
R46
R4
R5
R23
R20
R18
R21
R21
JW7
JW9
JW10
JW8
R36
R41
R45
JW2
R441
R8 R10
JW3
R6
R40
R43 R42
R2
R38
R47 R30
R48
R35 R33
U1
LP1
Q1
Q2
Q6
C9
D10
R11
R12
C7
R16
R15
R17
R19
R13
R22
R32
R31
Z2
D7
R14
U4
C3
C5
U3
U6
JW1
1
Z4
AC heater wires
See NOTE
MIN MAX RANGE HOLD H
Hz REL
mA
A
mV
V
V
OFF
!
!
A COM V mA µ A
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
PEAK MIN MAX
µ A
CAT II
4 1/2 DIGITS
1 Seconds
TRUE RMS MULTIMETER
V
V
Figure 3-7. —Location of wire harness White/Red wire and
Blue wire in P1 Optical Control Display wire
harness plug and Power Board P1 and P2
Connectors.
Blue
P2 Power board connector
P1 Power board connector
White/Red
To check White/Red wire and Blue wire for continuity:
1. Disconnect P1 and P2 from Power Board.
2. Disconnect Optical Control Assembly P1
from circuit board.
3. Jump White/Red wire and Blue wire at Power
Board P1 and P2 connector.
4. Connect ohm meter to White/Red wire and
Blue wire contacts at Optical Control Display
wire harness connector.
Jumper into P1-9 and P2-3
Figure 3-8. —Measuring DC voltage across the White/Red (+) and White/Violet (–) wire.
10.5 to 15.4 VDC
White/Violet
White/Red
+
12 VDC
in
–
12 VDC
in