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IC-751 / IC-751A RAM / PROM Memory Board
If you have a Icom IC-751 or IC-751A transceiver you probably know that when the
internal battery gets weak the transceiver stops working! PIEXX has corrected this
problem with the new ICOMPROM Ram replacement board. The ICOMPROM board
is a new, plug compatible, memory module that keeps the important setup information
in an onboard non-volatile PROM device while employing a battery backed RAM for
saving the memory channel data. With the PIEXX ICOMPROM board you will never
need to worry about your transceiver going dead from a low battery again!
Installation in IC-751 / IC-751A
1. Record any important memory information that you want to retain from your old
memory module. Since you are replacing the transceivers RAM, this information
will be lost when the new board is installed.
2. Disconnect the power cord from your transceiver!!
3. Remove the bottom cover of the transceiver.
4. Locate the old Icom RAM board, it is ~ 2 inch square board with the coin cell
mounted on it.
5. The old ram board is held in place with a small Phillips screw in one corner of the
board. Remove this screw and unplug the old RAM board.
6. Carefully align the new board with the connection pins protruding from the Icom
logic board. There are 2 connectors which need to line up, a 12 pin and an 8 pin.
Be careful to be certain that all of the pins are aligned with the mating receptacle
on the PIEXX ICOMPROM board and then press the board down onto the pins.
Figure 1. PIEXX ICOMPROM board Installed in the IC-751 Xcvr
7. Replace the bottom cover on the radio.
PIEXX ICOMPROM
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Table of Contents
Summary of Contents for PIEXX ICOMPROM IC-751
- Page 1 Be careful to be certain that all of the pins are aligned with the mating receptacle on the PIEXX ICOMPROM board and then press the board down onto the pins. Figure 1. PIEXX ICOMPROM board Installed in the IC-751 Xcvr...
- Page 2 Be careful to be certain that all of the pins are aligned with the mating receptacle on the PIEXX ICOMPROM board and then press the board down onto the pins. 9. The Logic board cover plate has an insulating material glued to its bottom. Make sure that the insulating material is in good condition, and replace it if not.
- Page 3 6. Preset the 32 memory channels in the normal fashion. If you haven’t set a particular memory channels data, but try to recall it, the display may show an improper frequency or mode. Figure 2. PIEXX ICOMPROM board Installed in the R71A Receiver Jumpers Unless otherwise noted, the ICOMPROM board is shipped with the jumpers set for the IC-751 / IC-751A transceiver.
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