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2.2. For PSU1, short the brown wire (+70v) to the red wire (0v) by poking the tips of the probes into the

open top of the connector housing, ensuring the probe tips touch the crimp bodies. Hold for 10

seconds, to allow the PSU rail to discharge to 0v through the power resistor.

2.3. Repeat for the orange (-70v) and red (0v) wires, and the yellow (Vdrive) and red (0v) wires.

2.4. For PSU2, the process is the same, but the sequence is as follows. Place the probes on: blue & purple,

grey & purple and white & purple.

Note: Earlier production models of the CV amplifiers, featured the same wire colours for both PSU

high-voltage connections. For these units, repeat the colour sequence used for PSU2 for PSU1.

3. Use a multi-meter and confirm that the voltage has been discharged from the power supplies.

3.1. For PSU1, measure inside the connector housing as before, probing between brown and red, orange

and red, and yellow and red, and check that there is close to 0v between these pairs of wires.

3.2. For PSU2, repeat the measuring process, for the blue & purple, grey and purple and white & purple

pairs.

3.3. If there is any residual voltage present above approximately 2v, then use the resistor and probes to

attempt to discharge the problematic supply rails for a further 10 seconds.

3.4. Repeat the sub-steps of step 3 to confirm that the supply rails are now discharged.