Fan Speed Modification
These instructions will assist you in installing the fan speed modification in your DigiCart/II. Please pay strict attention when you are disassembling the unit. Failure to do so will result in damage. Read all instructions before attempting to replace the circuit board. These instructions can also be used to replace the fan only in a DigiCart/II Plus. To order only the fan itself use product number 10940612T4712.

BEFORE YOU BEGIN:

This modification to your DigiCart/II must be performed by
qualified electronics personnel. Do not attempt this upgrade
unless you have some experience working with electronics
assemblies. You must follow the directions exactly to avoid any damage to the circuit board or components.


You will need the following tools and materials:
(The first 4 parts are included in the thermostatically controlled fan kit: product number D-FAN-KIT)

  • Hardware (2 screws, 2 nuts)
  • 2 pieces of heatshrink
  • Fan, P/N: 10940612T4H12
  • FanMod board assembly

    Also:

  • Phillips screwdriver
  • Wire strippers


CAUTION

ELECTRIC SHOCK HAZARD

To protect against injury or electric shock, and to ensure against
damage to the DigiCart/II you must disconnect the unit from AC
power.

STATIC SENSITIVE COMPONENTS

Components on the circuit boards may be damaged by static
electricity carried on your fingers and tools. To avoid damage to
components, always touch the metal chassis before touching the
surface of the circuit boards.

Procedure:

1. Make sure power switch to DigiCart is off.

2. Take off DigiCart cover by removing four screws.

3. Remove screws to the old fan and lift it from the DigiCart
chassis.

NOTE: It may be necessary to remove the Bernoulli drive in
order to remove the bottom screw of the old fan, or when
installing the new fan: Remove two screws on the side of the
DigiCart securing the Bernoulli drive to the chassis, remove the
power and data cables. Carefully lift out the drive, front first.

4. Clip red and black old fan wires at the fan. Strip and tin wires.

5. Secure FanMod board assembly plastic clip to DigiCart
chassis: Locate clip next to fan bay, 4" from side (center of unit),
1" from top.

6. Install new fan on DigiCart and secure it with screws. The fan
emblem should face the Digicart rear, with the fan wires facing
toward the center of the unit. The arrows next to the wires
indicate proper direction of air flow.

7. Using the heatshrink, solder black wire from the FanMod board
assembly to the black wire that was connected to the old fan.

8. Using the heatshrink, solder red wire from the FanMod board
assembly to the red wire that was connected to the old fan.

9. After first making sure that wires are correct, power up the
DigiCart and verify that the fan works properly.

10.Turn off the DigiCart and put the cover back on.