TROUBLESHOOTING INSTRUCTIONS -726280168

TM 9-2320-364-20-1

2-11. TROUBLESHOOTING INSTRUCTIONS (CONT).

Damage will occur to the cartridge if it is held at an angle during installation. The

cartridge must be held flat before sliding into place.

(f)

Slide cartridge forward until the cartridge clicks into place.

(2)

(a)

The data/power cable must be connected to the truck before the DDR can function.

(b)

The DDR will energize as soon as it is connected to the truck's electrical system and the ENGINE

switch is turned ON. If it does not, there are several things to check.

(3)

Troubleshooting.

(a)

If the unit does not power up, check that the cartridge is plugged in correctly. Slide the cartridge out

and plug it in again. If there is grease, oil or other grime on the edgeboard, carefully remove it with

a soft cloth. DO NOT use solvents and DO NOT attempt to clean the terminals in the DDR unit

itself.

(b)

Check the 2-amp fuse located inside the cartridge. Remove the screws to disassemble the cartridge.

Always use a 2-amp fuse for replacement.

(4)

Readout window. The readout window contains a liquid crystal display (LCD). It has four lines, each

with 20 characters. This provides a great deal of information at one time. A built-in backlight ensures

that you will be able to read the display regardless of the lighting conditions in the truck. The readout

uses letters, numbers and special symbols.

(5)

Keypad.

(a)

The keypad features 16 keys. They are totally sealed against contamination, including grease and

fluids. You can clean them with a damp cloth or mild cleaner. DO NOT immerse the DDR in

fluids; the edgeboard connector is NOT sealed.

(b)

The keys operate with a soft touch, but unlike membrane keys, they "give" to indicate that your

entry has been made.

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