LH II Netserver Intermittant Power Fault

[John Rogers_2]

Please can anyone help me? I believe I have a fault with the power console. I need to know what voltages should be present on the connectors on the power control board to allow me to trace the fault. The Line 1 LED is illuminated but the PSU1 led occasionally goes off when the fault is present. The test button on the power control board when pressed does start the power supply.

To date: Orange wires - +3.4v
Black wires 0.0v (Ground)
Red wires +5.00v
Yellow wire +12v
White wire -5.00v
Blue wire -11.60v
Green wire ?
Brown wires ?
Grey wire ?

Connector P27
Purple ?
white ?
red ?

Any help or advice would be appreciated.