5.38
3. Pull out board (PCB 1) from unit.
4. Plug in replacement microprocessor board (see Figure 1.1 for correct board) into right
hand slot.
5. Plug in IDC connector. Reconnect TB-H. (Observe polarity, top terminal is negative.)
5.3.6.5 Replacement of Analogue to Digital Converter
1. Unplug IDC Connector. Remove connections (if any) to lower terminal block. Note their
position.
2. Pull out board (PCB 2) from unit.#
3. Plug in replacement A to D board in second slot from the right.
4. Plug in IDC connector. Replace connections to lower terminal block.
5.3.6.6 Replacement of Amplifier Board
1. Unplug IDC Connector.
2. Disconnect Signal wires on TB-D.
3. Pull out board (PCB 3) from unit.
4. If pressure compensation is fitted, ensure that Link G-H on the new board is removed.
5. Plug in replacement Amplifier board into third slot from right.
6. Reconnect Signal wires in TB-D as shown in Figure 2.8 depending on analyser
configuration.
7. Plug in IDC connector. If, after changing the board, difficulty is encountered when setting
the span calibration, it may be due to the setting of the coarse span resistors. Refer to
sections 5.3.6.10 for re-setting details.
5.3.6.7 Replacement of Current Output Board
1. Pull out board (PCB 4) from unit.
2. Disconnect yellow and black wires from TB-F.
Disconnect output connections.
3. Plug in replacement Current Output board into centre slot.
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