Basic Troubleshooting Guide - Harman Kardon HD 990 Service Manual

HD 990
HD 990
Troubleshooting
Symptom
no lights on front panel
remote does not appear to operate
front panel lights, but cd does not play
play indicator lights, but no sound is heard
sound skips or stutters during play
sound is continually distorted
"error" lights up continuously in the display
Cause
• no ac power
• power switch turned off
• Weak batteries
• Blocked sensor
• disc is upside down
• poor connections
• Wrong source connections
• disc may be damaged
• surface vibrations
• Incorrect input
• Various
Solution
• make certain that ac power cord is plugged into a live outlet.
• turn on power switch.
• Install fresh batteries, observing polarity indications.
• remove obstructions from the front panel sensor or connect a remote
sensor to the remote In jack on the rear panel.
• reload disc with label side facing up.
• make certain that connections are secure and made to the correct
(e.g., cd) input.
• select cd source on receiver or preamp.
• try another disc.
• Isolate the unit from vibration by placing it on a firm surface or move
it further away from the speakers.
• make certain that the analog
are connected to a line-level audio input, not to a digital audio or
phono input.
• turn the unit off and on again. If the problem persists, turn the ac
power to the cd player off and on.
harman/kardon
Troubleshooting
audio outputs 1 of the cd player
13