Komatsu 830E-AC Shop Manual page 825

11. Check for proper voltage on
Relay Board 8
12. Improper voltage on relay
board 8
13. Check relay K3 for proper
voltage
14. K3 Relay is defective
15. Check relay K5 for proper
voltage
16. K5 Relay is defective
17. Check shutter disable switch
18. Check for open circuit in cir-
cuit 65T1
19. Check shutter disable switch
20. Defective shutter disable
switch
21. Check for 24VDC at solenoid
valve (4, Figure 19-4)
22. Check for open circuit in cir-
cuit 65T2
23. Check for ground at solenoid
valve
M19003
TABLE II. Troubleshooting
With the key switch ON, use a
V.O.M. to check for 24 VDC in cir-
cuit 712R at relay K3.
12. Perform troubleshooting proce-
dures in appropriate shop manual
to obtain proper voltage in circuit
712R with key switch ON.
13. Be certain there is 0 voltage in
circuit 65T. If there is, turn off Air
Conditioner switch or disconnect
wire 65T. Then check for 24VDC in
circuit 712ST on relay board 8.
14. Replace K3 relay.
15. Jumper 24VDC power source
to circuit 65S. Then check for
24VDC in circuit 65T1 on relay
board 8.
16. Replace K5 relay.
17. Check for 24VDC in circuit
65T1 inside shutter disable switch
box.
18. Locate and repair open con-
nection in circuit 65T1.
19. Check for 24VDC in circuit
65T2. If no voltage is detected,
switch shutter disable switch.
20. Replace shutter disable switch.
21. Check for 24VDC at solenoid
valve in circuit 65T2.
22. Locate and repair open con-
nection in circuit 65T2.
23. Check for ground at solenoid
valve terminal. Repair as neces-
sary.
Radiator Shutters
In Spec - GO TO STEP 13
Out of Spec - GO TO STEP 12
After repair, GO TO STEP 11
In Spec - GO TO STEP 15
Out of Spec - GO TO STEP 14
After repair, GO TO STEP 13
In Spec - GO TO STEP 17
Out of Spec - GO TO STEP 16
GO TO STEP 15
In Spec - GO TO STEP 19
Out of Spec - GO TO STEP 18
GO TO STEP 17
In Spec - GO TO STEP 21
Out of Spec - GO TO STEP 20
GO TO STEP 19
In Spec - GO TO STEP 23
Out of Spec - GO TO STEP 22
GO TO STEP 21
M19-7