Cadex C4000 SERIES, User Manual

Page: 124 / 152

Service
5.
Move all toggle switches on the front to the center
position (CHARGE).
6.
Re-install the lower housing. Make sure the toggle
switches are seated properly by gently tugging them
towards the bottom of the unit. Fasten screws.
7. Turn unit on. Check for correct sign-on message.
5. Installing OPTION-P
Important
Replacement of the EPROM must be
performed only by a qualified technician. Observe the
static precautions when opening the C4000.
Option-P consists of: EPROM
accessible through bottom cover
Clock Chip
accessible through bottom cover
Back-up Battery
accessible through right side plate
Warning
Before installing Option-P, remove all test
batteries, turn the unit off and disconnect the power
cord.
1. Remove plastic floor section by unscrewing 5 screws. (2
screws are located in the front rubber feet.)
Caution
Do not assert pressure on the Target Selector
switch when removing or installing the floor section.
Replace EPROM
2.
Identify the EPROM and observe its orientation (refer to
Figure 13.2 at the end of this chapter). Note the
orientation of the notch at one end of device.
3.
Use a designated IC remover or small blade screw
driver to gently lift the EPROM off the socket.
4.
When installing the replacement EPROM, assure that
-allIC pins are firmly plugged into the IC socket. Insure
that the notch is oriented towards the inside of the
Motherboard
Layout.
Install clock chip 5.
Ensure that jumper J4 is set correctly for the EPROM
type installed. There are two types of EPROM's
available: The 27C256 and the 27C512. Refer to the
Motherboard
Layout at the end of this chapter.
13-6
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