27
YMC-700/YMC-500
YMC-70
0/YMC-50
0
PRI xxx
PRD xxx
When there is a history of protection function due to excess current
When there is a history of protection function due to abnormal DC output
Cause:
An excessive current flowed through the power amplifier.
Supplementary information:
As current of the power amplifier is detected, the abnormal channel can be identified by
checking the current detect transistor.
Turning on the power without correcting the abnormality will cause the protection function to work immediately and the
power supply will instantly be shut off.
DC output of the power amplifier is abnormal.
The protection function worked due to a DC voltage appearing at the speaker terminal.
A cause could be a defect in the amplifier.
Turning on the power without correcting the abnormality will cause the protection function to work in 3 seconds and the
power supply will be shut off.
AD value is displayed, when the protection function is working
AD value is displayed, when the protection function is working
Note)
• Applying the power to this unit without correcting the abnormality can be dangerous and cause additional
circuit damage. To avoid this, if “PRI” and “PRD” protection function has been activated 3 times continuously,
the power will not turn on even when the “STANDBY/ON” key is pressed. In order to turn on the power again,
disconnect the power cable of this unit from the AC outlet once and then reconnect it again.
• The output transistors in each amplifier channel should be checked for damage before applying power to
this unit.
• Amplifier current should be monitored by measuring DC voltage across the emitter resistors for each
channel.
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