13TROUBLESHOOTING GUIDE
TROUBLE | PROBABLE CAUSE | REMEDY |
No power | Power cord is disconnected | Connect power cord |
| Auto On selector switch is in wrong | Check for correct position of the Auto On switch |
| position |
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| AC Voltage selector switch is in the | Make sure the switch is in the |
| wrong position | correct position for your region |
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| AC fuse blown | Replace with same value fuse |
A 23 will not turn on | DC trigger source wired in reverse | Check polarity of DC source with a voltmeter |
with DC voltage | or voltage too low | Try connecting a 9 V battery to the 12V DC input |
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| Auto On selector switch in wrong | Make sure Auto On selector switch |
| position | is in its 12V position |
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A 23 will not turn on with | Auto On selector switch in wrong | Make sure Auto On selector switch |
audio source | position | is in its Audio position |
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| Sensitivity incorrectly adjusted | Turn the Audio trigger Sensitivity |
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| knob counterclockwise |
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A 23 will not turn off when | Sensitivity level too high | Turn Sensitivity knob clockwise toward 200mV |
audio signal is removed |
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Power on, but no sound | Level controls turned too low | Turn level controls clockwise |
| Bad connection from preamplifier or | Check input connections or try a |
| controller | different set of cables |
| Check speaker load impedance. Check speaker | |
| been activated- one or both blue | wires and connections |
| channel LEDs not illuminated |
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| A 23 has overheated - red Hi Temp | Allow A 23 to cool. Check that there is adequate |
| indicator is on | ventilation around the A 23. Be sure the load |
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| impedance of each channel is no less than 4 Ω |
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Distorted sound | Damaged speaker | Connect each speaker to the opposite channel |
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| on the A 23. If the same speaker remains distorted, |
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| the speaker or its wire is damaged. If the other |
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| speaker distorts, the problem may be with the |
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| A 23, the preamp, or a source component |
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| Problem with preamplifier or source | Switch the left and right input cables. If |
| component | distortion moves to the other channel, the |
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| problem is with a component other than the A 23 |
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| Move to the correct position for the | |
| the incorrect position | jack in use |
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| Mono Bridge switch is in the Mono | Move switch to its Stereo position |
| bridged position |
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Hum and / or buzz | Ground loop between preamplifier | Move the Ground Lift switch to its Lift position |
through speakers | and A 23 or at the equipment rack | Install nylon shoulder washers on both sides of |
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| the panels of all equipment to insulate metal |
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| from touching the rack |
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| Ground loop from cable TV | Move the Ground Lift switch to its Lift position. |
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| Install cable isolation device such as the |
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| Xantech 634 Ground Breaker |
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| www.xantech.com |
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| Other ground loop | Contact Parasound Technical Service |
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A 23 is overheating | Load impedance at speaker terminals | Make sure the speaker or speaker |
| is too low | selector load is 4 ohms or higher |
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| Not enough ventilation | Make sure the A 23 has adequate ventilation |
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