Cpu Battery Checks; Tci Card Checks; Input Voltage; Positive Output Voltage - Komatsu 930E-2 Shop Manual

5. Measure voltage between circuit 72E (TB24) (+)
and circuit 72R (TB24) (-) in the Electrical Inter-
face Cabinet.
Voltage should be 5.0 volts.
6. If truck is equipped with Komatsu engine, install a
jumper from 22F0 @ TB32 to ground.
Voltage should change to 7.0 volts.
7. Remove jumper to 22F0.
8. Verify the display on the DID panel is lit.
Sensor Power Supply (SPS):
NOTE: Check only if experiencing problems with the
Fiber Optic Card, the LEM's, or the Capacitor
Monitor Panel.
9. Measure and verify the specified voltages below:

Input Voltage

Voltage should be between +20 and +32
volts with voltmeter positive (+) lead on
"IN+" (SP24V03) and negative lead (-) on
"IN-" (RTN59).

Positive Output Voltage

Voltage should be between +22.8 and +25.2
volts with voltmeter positive (+) lead on "V+"
(P24VDC19) and negative lead on "VR+"
(RTN58).
Negative Output Voltage
Voltage should be between -22.8 and -25.2
volts with voltmeter positive (+) lead on "V-"
(N24VDC19) and negative lead on "VR-"
(RTN60).

CPU Battery Checks:

10. Turn OFF the Control Power Switch (CPS) for this
test.
11. Connect a VOM across the screws securing the
green plate on the edge of the 17FB147 card in
the PSC panel. Connect the positive lead to the
top screw (2, Figure 3-3) and the negative lead to
the bottom screw (4).
Verify approximately 3.5 volts.
E03015 3/01 AC Drive System Electrical Checkout Procedure
(Release 17 Software)
12. Connect a VOM across the screws securing the
green plate on the edge of the 17FB144 card in
the TCI panel. Connect the positive lead to the top
screw and the negative lead to the bottom screw
Verify approximately 3.5 volts.
Note: If battery voltage is low in step 12 or 13, refer to
"Memory Backup Battery Replacement" instructions
on the following page.

TCI Card Checks:

13. Turn OFF the Control Power Switch (CPS).
14. Plug in the 17FB144, 17FB160, and 17FB104
cards.
15. While observing the FATL LED's at the bottom of
the 17FB144 card by the card extractor, turn ON
the Control Power Switch and notice that both
LED's will turn on briefly then turn off.
16. If either LED stays lit with the Control Power on, it
indicates that a TCI card is defective or the 5 volt
supply is not present.
Be certain control power is turned OFF before
removing or installing cards in the following pro-
cedure.
17. Turn CPS OFF and pull each TCI card individually
to determine which card may be causing the LED
to stay lit.
E3-9