Parr Instrument 1356 - Manual (Page 26)

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attached to the display. Set the display to the side. Care should be taken to avoid
scratching the display.
4. Remove the 5 screws holding the left panel to the chasis. Note: there are two
screws on the bottom of the unit. The power supply board is at the front of the side panel
and the cpu board is at the rear of the side panel.
7. Remove the display cable from the cpu board. Remove the 2 wire cable from the
battery to the cpu board. Remove the ribbon connector between the I/O board and the
cpu board at the cpu board. Remove the connector at the bottom of the cpu board for
the harness between the I/O board and the cpu board. Remove the 4 screws that
secure the cpu board to the side panel.
6. Install the replacement cpu board.
7. Reassemble unit by following these instructions in reverse.