Komatsu 830E-AC Shop Manual page 218

The AID system enables the indicating lights to be
flashing or constant. The AID also has the capability
of operating an audible alarm along with the light.
The eight printed circuit cards are:
• Diode Matrix (With Sound) Card (Slot 1)
• Diode Matrix (Without Sound) Card (Slot 2)
• Hot Switch Inverter Card (Slot 3)
• Hot Switch Inverter Card (Slot 4) (Not Used)
• Temperature Card (Slot 5) (Optional)
• Oil Level Card (Slot 6) (Optional)
• Temperature and Latch Card (Slot 7)
• Coolant Level and Flasher Card (Slot 8)
NOTE: Each card is identified with a number which
corresponds to a mating number on the housing. If
any cards are removed, make sure that the card
numbers correspond with the housing numbers
during installation See Figure 3-5.
FIGURE 3-5. AID SYSTEM CARD ENCLOSURE
1. Diode Matrix With Sound
2. Diode Matrix Without Sound
3. Hot Switch Inverter
4. Hot Switch Inverter (Not Used)
5. Temperature & Latch
6. Coolant Level & Flasher
D3-8
The following briefly describe each card and its func-
tion. Refer to Section R, Schematics, for the circuit
components described below.
Diode Matrix (With Sound)
The diode matrix with sound card works very much
like the other diode matrix card, except that it con-
tains extra diodes to activate the alarm horn in addi-
tion to the flasher. The circuits connected to
terminals A1 through A8 operate in the same man-
ner.
All of the card circuits are connected to the lamp test
switch on the overhead display area. In normal oper-
ation, these circuits are open and not functional.
When the operator pushes the lamp test switch, it
activates all the indicator circuits by grounding them.
This is used to verify that all lamps are functional.
Diode Matrix (Without Sound)
The diode matrix without sound card consists of a
series of diodes capable of working with eight differ-
ent indicator circuits. The indicator light can be a
flashing light by connecting it to the 12F circuit or a
steady light by connecting it to the 12M circuit. In
addition, some of the indicator light circuits are
routed through a dimmer module to allow the opera-
tor to vary the intensity of the lamps. These lamps
are fed by circuits 12FD (flashing) and 12MD
(steady).
When an indicator circuit is not activated, there is no
ground circuit for the bulb. When the indicator detect-
ing switch activates the circuit, it grounds the lamp
and the flasher circuit through the diodes. Any cir-
cuits connected to terminals C1 through C8 will oper-
ate in the same manner. The alarm horn is not
activated by this card.
Hot Switch Inverter
The hot switch inverter card is used to operate and
test the service brake indicator light. In normal condi-
tions Q4 transistor is off and the Indicator Light is off.
When the stoplight switch is activated, 24 volts is
sent to pin "E" of the hot switch inverter card. Tran-
sistor Q4 is turned on by this voltage and, in turn,
grounds the service brake indicator light. There is no
alarm horn operation with this card.
A second circuit on this card is used to operate and
test the retard speed control indicator light. When
RSC is turned OFF, transistor Q7 is off and the indi-
cator light is off. When RSC is turned on, 24 volts is
sent to pin "J" of the card. This voltage turns on Q7,
grounding the indicator light circuit.
24VDC Electrical System Components 10/06 D03036