Specifications

TROUBLESHOOTING
Should any difficulty be encountered in operation of your AUDIOMASTER System, the
trouble can often be traced to some simple source. The following is offered as a basic
guide to solving this kind of problem.
SYMPTOM PROBABLE CAUSE AND CORRECTION
Powermixer is "dead" (no
1. Check that ac power source is "live" and Model 1200
output, POWER LED off)
is plugged in.
2. Check that POWER switch is on.
3. Check that rear panel fuse (5 A,
250V) is good.
4. If the 1200 has turned off due to excessive internal
temperatures, allow at least an hour for cooling, and
reactivate unit. If difficulty persists have Model 1200
checked by qualified service personnel.
Power amplifier stage not
1. Check air vents for blockage.
operating (OVERLOAD
2. Check total speaker load (must be no lower than
LED is on)
4 ohms) and for possible shorted speaker cable.
3. Check that internal fan is operating (fan is located
on rear panel).
4. Turn MASTER VOLUME control down for several min-
utes to allow proper cooling. If difficulty persists, have
Model 1200 checked by qualified service personnel.
No signal at speaker (all other
1. Check for defective or improperly connected speaker
functions appear normal) cables.
2. Check settings of channel VOLUME and MASTER
VOLUME controls.
3. Check connections to EXTERNAL DEVICE LOOP.
Fuse blown
One of two inputs on same
channel not working
properly (both
%-inch and
3-pin jacks in use)
NPUT OVERLOAD LED
flashing
NOTE: Occasional
flashing is ok.
Loud clicks when certain
microphones or cables
are used
No MONITOR output (program
output normal)
Sound quality poor (weak
or thin)
1. Replace with identical fuse (5 A,
250V, 3AG).
2. If second fuse blows, have Model 1200 checked
by qualified service personnel.
1. Make sure similar microphones are used on both
inputs, and microphone impedances match the
im-
puts used.
2. Make sure a low-impedance microphone is not used
with aux level equipment on other input.
3. Make sure microphone switches are on; check
microphone cables.
1. Adjust INPUT ATTENUATION counterclockwise to
reduce channel input level.
2. Reduce input signal level at source.
1. Make sure PHANTOM 24V switch is not on (when
not needed).
2. Make sure unbalanced low-impedance microphone
or cable is not used when PHANTOM switch is on.
3. Check for defective microphone cables.
1. Make sure channel MONITOR and MONITOR
MASTER controls are turned up.
2. Make sure external Monitor amp volume control is
turned up.
3. Check for defective cable to MONITOR output jack.
1. Check for excessive treble boost or bass cut on
equalization controls.
2. Check for defective cables.,
3. Check impedance match at input.