5.29
10. Solder wires to measuring cell. Do not overheat the terminals as this could cause a leak.
The black sleeved wire goes to the terminal pin adjacent to the black spot and the yellow
sleeved wire goes to the terminal pin adjacent to the yellow spot.
11. Refit magnet frame. See Section 5.3.2., paragraphs 7 to 10.
5.3.2.2 Replacement of Photo-cells
Refer to Figures 5.1 and 6.2.
1. Remove magnet assembly (3) by following steps 1 to 6 of Section 5.3.2.
2. Unsolder green and red wires from the photo-cells (7).
3. Unscrew and remove coarse mechanical zero screw (9). Remove the photocell clamping
screw (25), M4 socket head screw (3mm allen key), and remove photocell assembly (7).
4. Unscrew and remove 2 x M2 slot head screws holding photocells to the assembly.
5. Reassembly is the reverse of this process. Ensure that the photo-cells are clean and free
of fingermarks before fitting.
Note: The photo-cells are fragile. Take care not to damage them during assembly.
6. Screw new photocells to the assembly.
7. Slide photocell assembly into zero assembly carefully and lock in mid-position with the M4
screw (25).
8. Solder wires onto the pins, green wire to the top, red wire to the lower. See Figure 5.1.
Care must be taken not to overheat the pins.
9. Replace magnet assembly. See Section 5.3.2, paragraphs 7 to 10.
5.3.2.3 Replacement of the LED Assembly
Refer to Figures 5.1 and 6.2.
1. Remove magnet assembly by following steps 1 to 6 of Section 5.3.2.
2. Remove photo-cells, see Section 5.3.2.2, paragraphs 2 and 3. Take care not to damage
them.
3. Unsolder black and blue wires attached to the LED (6). See Figure 5.1.
4. Unscrew M3 pan head screw (28) and remove LED assembly (6).
5. Screw new LED assembly into position.
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