Parr Instrument 1356 - Manual (Page 24)

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The 1356 Calorimeter Controller can be physically separated into two halves. The upper
part consists of the keyboard, LCD display, keypad and display driver board. This top
assembly is attached to the lower power half with two cables; display driver cable and a
power cable. Turn the instrument off.
1. Disconnect the power cord, terminal cable, balance cable, printer cable and any
Smart Link cables from the rear of the controller.
2.
Disconnect the two orange cables attached to the lower portion and adjacent to the
probe connection lug. Note which cable goes to the display.
3.
Push the rear of the controller near the bottom of the case, which will force the
display panel up.
4.
Grab hold of the front edge of the controller which has been forced up in the
preceding step, and guide it out of the front of the calorimeter case, tilting where
necessary to provide clearance of the BNC jacks.
5. Carefully lift the top and remove the two cables.
6. Attach the two cables to the new assembly.
Steps to replace an I/O Board in an A1135DD
1)
Turn off power and remove power cord.
2) Turn calorimeter around to gain access to the back.
3) Disconnect the two temperature probes (BNC) from the controller.
4) Disconnect the two wiring harnesses (orange connectors) from the controller.
5) Remove the 6 painted Phillip screws holding the retaining plate (557DD) to the
display of the controller.
Remove controller from the calorimeter.
6)
Disconnect the BNC connectors attached to the ends of the bucket and jacket
thermistor probes.
7). Remove the six screws located on the display bezel and remove the bezel
Warning: It is highly recommended that all Electro-static Discharge (ESD)
abatement procedures are used. Failure to do so can damage the circuit boards and
void your warrant
8) Remove the 5 phillip screws that secure the right side panel and the 2 screws that
are located on the bottom.
9) Disconnect the cable to the thermistor probes. Disconnect the harness at the top
front portion of the board . Disconnect the harness at the top rear portion of the board.
Disconnect the orange connector at the bottom rear portion of the board.
10) Unscrew the 6 screws that secure the I/O board to the right side panel.
11) Install the new I/O circuit board.