Gasboy 1000 Series FMS Diagnostic Manual - Manual (Page 121)

GASBOY Series 1000
7-2 03/07/03
REPLACING AN MPU (MICROPROCESSOR) PCB
IMPORTANT: Before replacing an MPU PCB, be sure to poll the site and/or print out all the
site's data (if possible).
1. Verify the jumper configuration of the new MPU PCB to ensure that it is ready for use. Use
extreme care in setting the jumpers. Incorrect configuration of JP3 and JP4 jumpers
can corrupt memory causing fuel transactions to be lost. Jumpers should be set up as
shown on the table on the following page.
2. Remove the ROM chip from the socket labeled U21 of the inoperable MPU and install it in
the U21 socket of the new MPU PCB. Be sure to install the ROM so that the end of the chip
which is notched is positioned upward (towards the buzzer).
3. Remove the RAM chip from the socket labeled U23 of the inoperable MPU and install it in the
U23 socket of the new MPU PCB. Be sure to install the RAM so that the end which has a
small recessed circle in the top corner is positioned facing upward (towards the buzzer).
4. Software versions 8.1 or higher and the FleetKey system require an additional RAM chip in
the U22 socket. Check if this MPU PCB has a RAM chip in the U22 socket which is the
same size and shape as the RAM extracted from the U23 socket. If it does, remove the
RAM chip from the U22 socket of the inoperable MPU and install it in the U22 socket of the
new MPU PCB. Be sure to install the RAM so the end which has a small recessed circle in
the top corner is positioned facing upwards (toward the buzzer).
IMPORTANT: If the MPU PCB contains the additional RAM chip in the U22 socket, it is
important to remember that although it appears to be identical to the RAM chip in the U23
socket, they are different. The RAM chip marked DS1235Y or bq4011 YMA-150 goes in the
U23 socket and the RAM chip marked DS1225Y or bq4010 YMA-150 goes in the U22
socket.
Remove Old MPU Board
5. Disconnect all cables from the MPU PCB. There will be 8 to 10 cables depending on system
options.
6. If applicable, disconnect cables and remove the Auxiliary Communications Port PCB by
squeezing the retaining clips of the two plastic PC-board supports and pulling the board away
from its mating connector on the MPU PCB. When the Auxiliary Communication Port PCB is
removed, the two plastic PC-board supports should be removed by using a nutdriver to
unscrew them.
7. Remove all screws and optional standoffs which secure the MPU PCB. Remove the MPU
PCB from the Series 1000.
Install New MPU Board
8. Install the new MPU PCB and secure it in place with the previously removed screws and
optional standoffs.
9. Screw the two plastic PC-board supports onto the screws protruding through the new MPU
PCB. Replace the Auxiliary Communications Port PCB by matching up the mating
connectors and pressing it into place on the MPU PCB. Re-connect all cables going to the
Auxiliary Communications Port PCB.
10. Reconnect all cables to the MPU PCB. See page 2-8 for the proper location of each cable.