Class1 ESM3 - Manual (Page 13)

13
TROUBLESHOOTING
GMC / AMS 04-27-2000
REV B
P.N. 104702
TP1 TP2
TP3 TP4
R21
U24 U23
R20
R19
R18
R17
R16
R15
R14
C18 C17
http://www.class1.com
FAX 352-629-2902
PHONE 352-629-5020
OCALA ,FL
Z1
XT1
U22 U21 U20 U18 U16
U15 U14
U13 U12 U11 U10 U9 U8 U7
U5
U4
U3
U2
U1
RSP2
RSP1
R11
R10
R9
R8 R7 R6 R5
R4 R3 R2
L2
L1
J1
FT14 FT12 FT11 FT10 FT8 FT7 FT6 FT5 FT4 FT3 FT2 FT1
FT15
FB2
FB1
F1
D7 D6 D5 D4
D3
D2
D1
C16
C15
+
C14
C13 C12
C11 C10 C9 C8 C7
C5
C4
C3
C2 C1
T15 T14 T13 T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1
SW1
FT13
R12
R13
U19 U17
J2 J3 J4 J5 J6 J7 J8
J9
SW2
BATTERY
SWITCH
Switch
Master
GROUND
POSITIVE
3
4
1
2
1
2 3 4
BATTS
SHED
T15
SHED O/I
MAIN/ISO
7 1
OVER VOLTS
NO
MAIN
1 7
FAST IDLE
YES
ON
OFF
ON OFF
GND POS
Out-1 Out-2 Out-3 Out-4 Out-5 Out-6 Out-7
ISO
MASTER
TB 12
INPUT
GND POS GND POS GND POS GND POS GND POS GND POS
Master Switch
Polarity Jumper
Output Polarity
Jumpers
FT8
FT9
Voltage Test Points:
TP1
System Voltage
TP2 Filtered Voltage
TP3 +5 VDC
TP4 Ground
SW1
configuration switch
Terminal 12
Control Jumper
Caution: If this jumper is in
the Master Switch position,
it is tied directly to Terminal 10
Visual check
Check jumpers J1-J9 and ensure that they are in the correct position for the application.
Check switch SW1 that 1-4 are in the correct postion for the operation desired.
Voltage Supply check
Check for system voltage between terminals T14 (ground) and T13 (12VDC). Check for sys-
tem voltage betweenTP4 (ground) and TP2 (12 VDC). These should be within 0.5 VDC.
Check for 5 VDC between TP4 and TP3 (+5 VDC).
These voltages must be present for the system to operate.
Master Switch check
Verify that J1 is in the proper position for the Master Switch you are using. Check for the input
at T10.
This controls load sequencing on and off.
Load Manage Enable check
Check for a ground at T11.
This inputs allows loads to shed and the Fast Idle output.
Output Test
Verify that jumpers J2 through J8 are in the correct position. With power on and a Master
switch input there should be either 12 VDC or Ground on T1 through T7 dependent on the the
position of J2-J8.