Combined Instrument; Indicator Lights - Linde E25 Service Training

Service Training
2.6.10

COMBINED INSTRUMENT

The combined instrument consists of the battery discharge indicator, the hour meter and a number of
indicator lights. All functions in the combined instrument are controlled by a 4-bit microcontroller. The
microcontroller has an internal ROM (read-only memory) containing the operating software. The software
version is indicated on a label on the side of the combined instrument. From software version 3.0, the software
version is displayed in the display after the self-test is completed upon turning the key switch.
The microcontroller is also provided with RAM (working storage) and an EEPROM containing truck-specific
data (battery characteristics, elapsed service hours and other data). With the aid of the diagnostic unit it is
possible to communicate with the combined instrument via interface connector 6X6. Two relays are also
installed which control the two fans (from series 7/95). The signals from the thermal sensors and brush wear
switches are evaluated over various analogue and switching inputs.
2.6.10.1

INDICATOR LIGHTS

1 Field weakening active indicator light*
2 Service interval indicator light
3 Turn signal indicator light*
4 Parking brake warning light (from series 12/94)
5 Fan warning light (from series 7/95)
6 Brake shoe warning light*
7 Motor brush warning light
8 Hydraulic oil level warning light*
9 Engine temperature warning light (from series 7/95)
10 Forward travel switch indicator light (single-pedal model)*
11 Hydraulic oil temperature warning light*
12 Reverse travel switch indicator light (single-pedal model)*
* Optional equipment
Section 2.6
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