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Trouble Shooting Guide
CAUTION: If you detect a fault, switch the preamplifier OFF immediately before you check the device
or change cables or connections.
The remote control doesn’t work.
• Check batteries
• Make certain the rear panel power switch on the ATP 8500 is turned on.
• You must push the “AVC” button on the top row of the remote. This sets the remote to address the ATP 8500.
The other buttons on the top row are for controlling your other equipment (DVD player, CD players, etc.).
Then press the “power” button on the remote.
There is no sound.
• The power cord is disconnected or you have turned the power OFF. Check whether the LED in the STANDBY button
is illuminated.
• You have selected an input with no source connected. Press the “Input Search” button on the front panel to
automatically search for input signals.
• You have selected an input that has no signal (e.g. tuner is not on, or there is no disc in the CD player or the tape
recorder has no tape running).
• The fuse is blown.
• The Tape Monitor function is ON.
• No 5.1 surround audio (video works, however) because you don’t have the digital audio output from the DVD player
connected to one of the digital audio inputs (you probably just have the analog audio connected).
The sound is missing in one or more channels.
• There is a defective interconnect cable or cables.
• If you’re using the XLR balanced inputs and/or outputs, make certain pin 2 is wired “hot.” Some products built in
Asia (and even some built in the USA) use pin 3 as “hot.” Also, if you’re using #2 wire adapters to the 3 wire XLR,
make certain pin 2 is wired correctly and pins 1 & 3 are tied together.
• The interconnect cable is making poor contact or not connected at all. Check and if necessary unplug and replug the
cable or cables.
• You might be listening to stereo, not surround sound.
I am hearing a buzz or hum.
• The interconnect cable is defective.
• The interconnect cable is partially out of its socket.
There is hum during tape playback.
• The tape deck is too close to the power amplifier.
• Plugs are making poor contact with sockets.
Some functions are not working.
• The control processor is latched. Switch POWER off (rear panel power switch) and wait for about a minute. Switch
POWER on. The ATP 8500 should now operate normally.
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