NAD C 372 Manuel D'installation page 10

Problem
NO SOUND
NO SOUND ONE CHANNEL
WEAK BASS /
DIFFUSE OR NO STEREO IMAGE
REMOTE CONTROL HANDSET NOT WORKING
POWER/PROTECTION LED STAYS RED UPON
TURNING POWER ON
POWER/PROTECTION INDICATOR TURNS RED
DURING OPERATION
SPECIFICATIONS
AMPLIFIER SECTION
(8 ohms within rated distortion)
Total harmonic distortion at rated power
Input sensitivity and impedance
Frequency response 20 to 20,000 Hz
Signal/noise ratio; ref rated power / 8 ohms (A-WTD)
Signal/noise ratio; ref 1W / 8 ohms (A-WTD)
Specifications are subject to change without notice.
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10
TROUBLESHOOTING
Cause
• Power AC lead unplugged or power not
switched on
• Tape 1 Monitor selected
• Mute on
• Rear Pre-out/Main-in amp links not fitted
• No speakers selected
• Balance control not centred
• Speaker not properly connected
or damaged.
• Input lead disconnected or damaged
• Speakers wired out of phase
• Bridge Mode selected when speakers are
connected normally
• Batteries flat, or incorrectly inserted
• IR transmitter or receiver windows obstructed
• IR receiver in direct sun or very bright ambient
light
• Loudspeakers cabling has a short-circuit
• Amplifier has over-heated.
• Overall impedance of loudspeakers too low
Power output Stereo Mode 2 x 170W
IHF dynamic power; 8 ohms 2 x 220W
IHF dynamic power; 4 ohms 2 x 340W
0.02%
IM distortion at rated power 0.003%
Damping factor 8 ohms >150
1.22 V / 20k ohms/470 pF
±0.3dB
>120dB
>100dB
Remote Control Yes, SR 5
Solution
• Check if AC lead is plugged in and power
switched on
• De-select Tape 1 Monitor mode
• Switch off Mute
• Fit links
• Select the appropriate speakers (A / B)
• Centre Balance control
• Check connections and speakers
• Check leads and connections
• Check connections to all speakers in the system
• Disengage Bridge Mode
• Check or replace batteries
• Remove obstruction
• Place unit away from direct sun, reduce amount
of ambient light
• Turn amplifier off and check loudspeaker cable
connections for both speakers at amplifier's back
panel and loudspeakers. Turn amplifier on.
• Turn amplifier off. Make sure ventilation slots on
top and bottom of amplifier aren't blocked.
After amplifier has cooled down, turn back on.
• Ensure the overall loudspeaker impedance isn't
below 4 ohms.
• Check loudspeaker cables for short circuits