T2004 Multi-Control Head System Manual System Fault Finding 29© Tait Electronics Limited May 2004ProblemTransmit/ Receive audio is excessively noisy.Suggestion■ Confirm radio is OK by removing multi-drop network and connectinga Primary control head directly to the interface board SK3.■ If problem is in the network, check for cable faults, remove noise sourcesor re-route cable away from noise sources.■ Ensure mic clip is isolated from metal work to avoid earth loops.ProblemGlobal mute is not functioning.Suggestion■ Check JP1 is fitted in the control head.■ Check microphone clip is correctly earthed.ProblemControl head only shows 2372A510 on power on or all digits and LEDsflash.Suggestion■ One of the keys on the keypad is stuck down.■ Keypad PCB has become contaminated with chemicals or liquids.
