9 .
O P E R A T I N G I N S T R U C T I O N S
15
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F A U L T D E T E C T I O N
P R E C A U T I O N S
1. Always use the fuse with the same specifications and be sure to tighten the fuse holder to
prevent poor contact.
2. The machine uses single-chip control, so the continuous switch time interval should be
more than 10 seconds.
Failure
Cause
Check
No reaction when power on
Check weather main power
voltage is well connected
Weather AC fuse is blown
Check main power supply voltage
and power voltage polarity
replace insurance tube of the of
the same specifications
Over Temperature" failure
due to long time use in full
power, the internal tempera
ture exceeds the limit value
reduce the output power, or
standby till the temperature de
crease
Overload" or "short"
The output load is light, the
output voltage is too high
properly reduce the output
amplitude, adjust the volume knob
overload or short circuit
exceeds the rated capacity
connect to external load
exceeds the rated capacity
check constant voltage output
circuit
reduce the load
Before connecting the amplifier to the power socket, please make sure the supply voltage is in ac
cordance with labeled behind the backboard of amplifier.
Before connecting the power line with power socket, please make sure the power line is not broken.
Connect the power line before starting up, and connect other equipments as well. Pull up the power
line after closing down.
In a sound system, the amplifier should be the first to start up and the last to close down. Starting up
order: First start up the sound source equipments, and then start up the amplifier. Following this
order, you can avoid damaging the speakers.
1. Starting up and closing down
2. Standby control
The "GND" and "STBY IN"or "GND" and "STBY THRU" port from short circuit backboard can trigger
amplifier standby function. The machine disconnects amplifier output port and goes into standby
status. Stand-by power consumption is less than 80W, front panel "STBY" indicator light is on.
,
Attention: The input signal indicator light won t extinguish in stand by status. Disconnect backboard
"GND" and "STBY IN" or "GND" and "STBY THRU" short circuit condition, the machine is recovering
proper functioning.
Circumscribe display panel from backboard monitor port "GND" and "STBY OUT", amplifier working
condition can be monitored. When the amplifier is working normally, monitor port output is 5V.Direct
voltage lightens circumscribed display panel build-in indicator light. When amplifier protection status
is triggered because of high temperature or overload or output connection short circuit, monitor port
output low level 0V, circumscribed display panel indicator extinguishes. It means the amplifier is in
protection state. When the amplifier return to normal working status, circumscribed display panel
indicator is lightened.
3. Monitoring port operation
