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Chapter 5 - Help
GTP-870HD Owner’s Manual
Troubleshooting
The table below shows possible causes and solutions to common GTP-870HD issues. If you do not see the an-
swers you need here, please contact your Adcom dealer or customer service department; see page 63.
Symptom Possible Reason Possible Solution
No sound • Power cable unplugged
• Rear panel power switch turned off (0)
• Tape Monitor selected
• Mute on
• Incorrect Input Config setting
• Amplifier powered off
• Plug in power cable
• Turn rear panel power switch on (1)
• Press Tape to de-select Tape Monitor
• Switch off Mute
• Make sure audio input is set correctly in Input
Config menu
• Power on amplifier
No sound on one
channel
• Speaker not properly connected or damaged
• Input cable disconnected or damaged
• Speaker set to “None” in menu system
• Check connections and speakers
• Check cables and connections
• In Speaker Config menu, set speaker to “Small” or
“Large”
No sound on surround
channels
• No surround mode selected
• Mono sound source
• Speakers/amplifier not properly connected
• Surround volume level too low
• Select a surround mode
• Test system with stereo or Dolby Surround mate
-
rial
• Check speaker/amplifer connections
• Increase surround volume level
No sound on center
channel
• Center speaker set to “None” in menu system
• Speakers/amplifier not connected properly
• Center volume level set too low
• In Speaker Config menu, set Center speaker to
“Small” or “Large”
• Check speaker/amplifier connections
• Increase Center volume level
“Dolby Digital” OR
“DTS” auto-detec
-
tion function does not
work
• Source not connected using digital input
• Incoming signal is set to PCM instead of Bitstream
• Connect digital output of source to GTP-870HD
• Check the Digital Out setting on your source
component
Weak bass/diffuse
stereo image
• Speakers wired out of phase • Check connections to all speakers in the system
Remote control not
working
• Batteries dead, or incorrectly inserted
• IR transmitter or receiver windows obstructed
• IR receiver in direct sun or bright ambient light
• Check or replace batteries
• Remove obstruction
• Place unit away from direct sun, reduce amount
of ambient light
No sound with tuner • Antenna leads incorrectly connected
• Station not selected or weak signal
• Mute on
• Check antenna connections to preamplifier
• Re-tune
• Switch off Mute
Noise, hiss on AM and
FM
• Weak signal • Check station tuning
• Adjust or replace antenna
• Press St/Mono button to reduce hiss
Distortion on FM • Multi-path signals or interference from another
station
• Check station tuning
• Adjust or replace antenna
Whistles or buzzes on
FM & AM
• Interference from other electrical sources, e.g.,
computers or games consoles
• Check station tuning
• Switch off or move the source of the electrical
noise
Whistles or buzzes
on AM
• Interference from fluorescent lighting or electri
-
cal motor
• Check station tuning
• Adjust or replace AM antenna
No picture • Incorrect TV input selected • Check the input setting on your TV
• If the GTP-870HD is connected to your TV in
more than one way (e.g., S-video and Component
video), select the TV input that corresponds with
your selected source component
Cannot access setup
menu
• Not in Main mode
• HDMI or Progressive Scan video output selected
• Press Main, then press Setup
• Select Video, S-video, or Component output to
view Setup menus
Cannot power off unit • Setup menu is active • Press Setup to exit the Setup menu, then power
off unit