Macrotech 2401 in standby mode
Posted 19 September 2011 - 06:23 AM
According to the manual this is the StandBy Mode. When I switch the amp on now I can hear the relay click every 4 seconds so apparenty the circuitry keeps checking whether the problem is solved. Can anyone tell me what might have happened and what there's to do now? Is there some reset option? Switching on and off doesn't help, the speakers are ok, speakerleads aswell, inputleads also, I've checked all cables. The unit (clean as new) has got the PIP CLP module fitted an I've cleaned the contacts of that multiconnector.
Posted 19 September 2011 - 12:47 PM
Posted 19 September 2011 - 02:54 PM
Posted 19 September 2011 - 04:11 PM
The power for the mains transformers is switched by relays. Those relays will switch off the power again if a serious fault in the output stage is detected, for example high DC offset caused by shorted output transistors or faulty drive. This is a job normally done by speaker relays in other amplifiers but the macrotech does it on the mains side.
Tracking that fault involves testing transistors, diodes, resistors etc and replacing with correct types in the proper manner.
If you are tempted to have a poke around anyhow, discharge the bus caps before inserting fingers or tools. Pull the wall plug before removing covers.
Posted 19 September 2011 - 04:56 PM
Have a nice day ...!