Question about Myryad M Series MDP 500 7.1-Channel Amplifier
After 10 to 20 minutes of operation the pre-amp locks up, usually with a "Myrtad MDP500 Powering-up" message. At tjis point the powerr button does nothing. The only way to get around the problem is to unplug the unit. I suspect a micro-processor problem. Is their a US repair service that anyone knows of? Is a schematic available. I have not received any response from my e-mail communications to Myryad.
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When there is a Call for heat, the control delays ignition until combustion air
Blower operation has been proved and pre-purge period
Has elapsed. It then opens the gas valve and generates a
Spark to ignite the burners. Trial for ignition lasts for 7 seconds.
At the same time, the control begins monitoring the
Flame sensor. If the flame current is too weak (less than 1
Micro amp) or if the burners do not ignite (within the 7 second
Ignition trial), the control will shut off spark and the combustion
Air blower and de-energize the gas valve. Flame
Current should be between 1 and 5 micro amps to keep the
Gas valve open.
The control will attempt to ignite the burners up to two more
Times. Each time the control restarts the ignition sequence,
It begins with a 45 second pre-purge. If flame is not sensed
After the third trial, the control locks out. Lockout means that
The control shuts off the gas valve, spark and combustion air
Blower for 60 minutes. At the end of 60 minutes the control
Completely resets and will attempt ignition up to three times.
The control can be manually reset before the end of 60 minutes
By momentarily turning off power to the unit.
here is a link to an operations manual
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