Troubleshooting
Symptom:
Device remains 'OFF'
•
Make sure that the power cord is securely seated in the IEC socket and plugged all the way into the AC outlet.
•
Make sure that the AC outlet is live (check with tester).
•
Remove power cord and check the Fuse. If blown, then replace with exact type and rating.
Symptom:
Device is 'ON' but no audio output
•
Is the master level control on the front panel turned up? The gain control on the rear panel may be at minimum position.
•
Is the signal source turned up? Make sure that the signal level from the device preceding the SM 50Ak is high enough to
match the Input sensitivity (Gain control on rear panel).
•
If either stereo pair is not producing sound, then switch the signal around. If the problem also switches sides, the problem is
not the monitor. It could be a bad signal cable, or no signal from the mixer.
Symptom:
Distorted
sound
•
Ensure secure connectivity of the TRS / XLR.
•
Reduce signal level at mixer or reduce gain control of SM 50Ak at rear panel.
•
Please monitor the signal with headphones. Distorted sound in headphones indicate that the problem lies in the signal
source.
Symptom:
Noise / Hum / Line interference
•
Proper signal wiring between the mixer and the monitor eliminates the hum, buzz and all sorts of crackling noises. Make sure
all connections are secure.
•
If unbalanced sources are used, wire the connectors such that the unbalanced ground of the source is connected to the
inverting pin (pin 3 for XLR, ring for TRS jack) and ground (pin 1 for XLR, sleeve for TRS jack). Improper cabling will result in
unsatisfactory audio reproduction. (please refer to Fig. 5 on page 4)
•
If a CATV cable is connected to the system, and a persistent mains hum occurs, disconnect it. If the hum goes away call the
cable operator to check for proper cable grounding methods. Using BALUN transformers (1:1, isolated type) might solve the
problem.
•
Make sure that the signal cable is not routed near AC cables.
•
If a light dimmer or triac-based device exists on the same AC circuit as the monitor, buzzing noises may occur. AC Line filters
may eliminate the problem.
Page 5
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SM 50Ak
