Software Upgrade/Replacement - Compac CNG Installation And Service Manual

Servicing

Software Upgrade/Replacement

Record Set-up Data and Tote
Information
Remove the software EPROM
Install new software EPROM
Compac Industries Ltd.
You can only upgrade the loading post software by replacing the EPROM
chip.
Before working on the loading post electronics, take basic anti-
static precautions by wearing a wristband with an earth strap.
1. Access the C4000 Microprocessor PCB by opening the front panel.
2. Record all the set-up data by accessing the Parameter switch (SW1)
and the K-Factor switch (SW2). Refer to Parameter Switch Settings (see
page 17) and K-Factor Switch Settings (see page 17) to obtain this
information.
The following data is required from the K-Factor switch (SW2):
 The K-Factor (see page 18).
Minimum flow rate (LFA)

 Maximum flow rate (HFA)
3. Record the totals information by pressing the nozzle switch or start
button quickly five times
1. Turn off the loading post.
2. Remove the software EPROM chip, using an EPROM extractor.
1. Plug in the new software EPROM, checking that all of the legs are
correctly located in the socket. The chip should be located as far to the
bottom of the socket as possible. This leaves a gap of two pins from the
top of the chip to the top of the socket. Pin 1 of the EPROM is then
located in the top left corner (pin 3 of the socket).
2. Turn on the loading post.
3. Check that the initial set-up data and totals information is the same.
If the initial set-up data is different, re-enter this information, as per
Parameter Switch Settings (see page 17) and K-Factor Switch Settings
(see page 17).
4. Check the loading post operation Checking Post Operation (see page
25)
Page 37
Software Upgrade/Replacement
www.compacngv.com