Output Voltage Adjustments, General | SoundCraft CPS250, CPS275

Reassembly is simply a reverse of the procedure above. Particular care should be taken when fixing the regulators, ensuring that the pins are not bent or the circuit board pads strained when the fixing screws are tightened. The regulator screws are tapped into a relatively soft aluminium heatsink. DO NOT OVER-TIGHTENor you will strip the thread in the heatsink. High performance mounting pads must be fitted between the regulators and the heatsink. The regulators must be checked for isolation from the heatsink using a multimeter.

Re-dress cable forms in their original positions and secure where applicable with cable ties.

OUTPUT VOLTAGE ADJUSTMENTS

The +/-17V and +48V rails are adjustable via trimpots on the pcb. After any repair these should be checked on load and adjusted if necessary. Set the 17V rails to 17.5V +/- 0.1V, and the 48V rail to 48.3 +/- 0.1V. The 5V rail is not adjustable.

GENERAL

Before replacing the top cover on the unit, carefully remove any dust from surfaces within the unit.

Carefully check all wiring connections and ensure that there are no loose parts lying around inside the unit.

Technical Description