Komatsu PC130-7, Shop Manual

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20-402
PC130-7
TROUBLESHOOTING
(1)
BEFORE CARRYING OUT TROUBLESHOOTING WHEN CODE IS
DISPLAYED
Connection table of fuse box
a
This connection table shows the devices to which each power supply of the fuse box (FB1) supplies power
(A switch power supply is a device which supplies power while the starting switch is at the ON position and
a constant power supply is a device which supplies power while the starting switch is at the OFF position).
a
When carrying out troubleshooting related to the electrical system, you should check the fuse box and fus-
ible link to see if the power is supplied normally.
Type of power
supply
Fuse No. Fuse capacity Destination of power
Switch power supply
(Fusible link: A34)
1 10A
Governor and pump controller (Controller power supply)
PC-EPC solenoid (Emergency pump drive switch circuit)
Swing holding brake solenoid
(Swing holding brake release switch circuit)
2 20A Governor and pump controller (Solenoid power supply)
3 10A
PPC oil pressure lock solenoid
Starting motor cutout relay (For PPC lock)
4 10A
Cigarette lighter
Windshield washer motor
5 10A Horn
Switch power supply
(Fusible link: A34)
6 10A Lower wiper motor [If equipped]
7 10A Rotary lamp [If equipped]
8 10A
Working lamp (Boom and right front)
Working lamp (Left front and rear) [If equipped]
9 10A One-touch power maximizing switch circuit
10 10A Fuel priming pump [If equipped]
Switch power supply
(Fusible link: A34)
11 20A Air conditioner unit
12 20A
Starting motor cutout relay (For personal code)
Monitor panel (Switch power supply)
13 20A
Light relay 1
Light relay 2
Panel night light signal circuit
14 10A Heated seat [If equipped]
15 10A
Heated seat [If equipped]
Travel alarm [If equipped]
Constant power
supply
(Fusible link: A35)
16 10A DC/DC converter (Power supply to 12-V devices)
17 20A Monitor panel (Constant power supply)
18 10A Starting switch
19 10A Room lamp
20 10A (Spare)
BEFORE CARRYING OUT TROUBLESHOOTING WHEN CODE IS DISPLAYED