Specifications

Troubleshooting
- --
Symptom
Probable Cause or Correction
Console is "dead" (no output, POWER LED off)
1. Check that ac power source is "live" and that
console is plugged in.
2. Check that power ON-OFF switch is on.
3. Check that rear-panel fuse
(IOA, 250V) is good.
Console appears to be overheating (TEMP WARNING
LED on)
1. Check air louvers for blockage.
2. Check for proper speaker load or shorted speaker
cable.
3. Check air filter and clean if necessary.
Console power amplifiers turn off and remain off
(SHUTDOWN LED on)
1. Turn MASTER controls down for one minute to allow
proper cooling.
2. Turn console off for a few seconds and turn back on.
3. If shutdown persists, have console checked by
qualified service personnel.
No signal at speaker (all console functions appear
normal)
1. Check for defective or improperly connected
speaker cables.
2. Check for improper connections to EQ or PA INPUT
jacks.
3. Check settings of channel VOLUME and MASTER
volume controls.
Console fuse blown
1. Replace with identical fuse (IOA, 250V, type 3AB or
ABC).
2. If second fuse blows, have console checked by
qualified service personnel.
One of two inputs on same channel not working properly
1. Make sure similar microphones are used on both
(both
%-inch and 3-pin jacks in use)
inputs, and microphone impedances match the
inputs used.
2. Make sure microphone is not used with accessory
equipment on other input.
3. Make sure both microphone switches are on.
INPUT
CLIP LED flashing
1. Adjust INPUT ATTEN to reduce channel input level.
2. Reduce input signal level at source.
PA OVERLOAD LED flashes while DB PEAK indicators
1. Check for defective (shorted) speaker cable.
read less than
+ 6
2. Check that load impedance is not too low (too many
speakers are connected).
Loud noise clicks when certain microphones or cables
are used
1. SIMPLEX 24V switch is on (when not needed).
2. Unbalanced cable used when SIMPLEX 24V switch
is on.
3. Check for defective microphone cables.
No monitor output (program output normal)
1. Check monitor output connection to EQ or PA INPUT,
or external amplifier.
2. Make sure MONITOR and MONITOR MASTER
controls are turned up.
3. Monitor speaker volume control (if present) turned
down.
Sound quality poor (weak or thin)
1. Excessive equalization on graphic equalizers.
2. Defective input or patching cables.