Servomex SERVO PRO 14440D1 - Replacing the Front User Interface PCB

01440D Light Industrial Gas Analyser Service Manual.2.12
2.10 Replacing the Front User Interface PCB (01420904)
1. Remove the main control PCB, refer to section 2.9.
2. Disconnect the display ribbon cable.
3. Undo the five screws which retain the PCB.
4. Before installing new control PCB, transfer the switch settings for the display
(reference Table 2.2 and Figure 2.4).
5. Replace the front panel PCB, paying particular attention to the alignment of the
LED's associated with the function switches and bezels. Before tightening the
fixing screws, ensure that the switches operate without ‘sticking'.
6. Installation is the reverse of the removal process. Ensure spacers are
transferred from old PCB as required.
Table 2.2 SW3 Switch Settings
Measurement SW3 Settings
1 2 3 4,5,6 7 8
100% O
2
, CO
2
& CH
4
ON OFF OFF OFF OFF OFF
50% CO
2
, CO & CH
4
ON OFF OFF OFF ON OFF
25% CO
2
, CO & CH
4
ON OFF OFF OFF OFF ON
10% CO
2
& CO OFF ON OFF OFF OFF OFF
5% CO
2
& CH
4
OFF ON OFF OFF ON OFF
2.5% CO
2
& CO OFF ON OFF OFF OFF ON
1% CO
2
& CO OFF OFF ON OFF OFF OFF
0.5% CO
2
OFF OFF ON OFF ON OFF
0.25% CO
2
OFF OFF ON OFF OFF ON