Installation Manual

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INTEGRATED AMPLIFIERS
TROUBLESHOOTING CHART
AC LINE FUSE REPLACEMENT
AMPLIFIER IS COMPLETELY DEAD.
POWER INDICATOR DOES NOT GLOW.
POWER INDICATOR GLOWS BUT THERE IS NO OUTPUT
FROM THE AMPLIFIER.
LOUD HUM OR CRACKLING SOUND FROM THE SPEAK-
ERS.
OUTPUT LEVEL CHANGES CYCLICALLY
SOUND IS INTERMITTENT.
SOUND IS DISTORTED AND OVERDRIVEN.
ACOUSTIC FEEDBACK OR LOUD SQUEAL OCCURS WHEN
AMPLIFIER IS TURNED ON.
THE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO AVOID ELECTRIC
SHOCK DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING
INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL ONLY.
CAUTION !
REMOVAL OF THE AMPLIFIER COVER PRESENTS AN ELECTRICAL SHOCK HAZARD
ALWAYS REMOVE THE POWER CORD FROM THE AC WALL OUTLET
PROBLEM SYMPTOMS PROBABLE CAUSE
1) NO VOLTAGE PRESENT AT AC OUTLET.
2) AC LINE FUSE OPEN.
3) DEFECTIVE OR OPEN POWER CORD.
4) POWER SWITCH INOPERATIVE.
5) POWER TRANSFORMER WINDING OPEN.
6) POWER INDICATOR DEFECTIVE OR DISCONNECTED.
1) INPUT CONTROLS SETTING NOT ADJUSTED PROPERLY.
2) SPEAKER WIRES SHORTED.
3) SPEAKER(S) LINE INTERRUPTED.
4) MICROPHONE OR PROGRAM SOURCE INTERRUPTED.
1) MICROPHONE INPUTS INCORRECTLY WIRED.
2) OPEN GROUND OR SHIELD IN INPUT CABLES.
3) SPEAKER TERMINALS SHORTED TO CHASSIS GROUND.
1) SPEAKER LINE SHORTED.
2) ONE OR MORE SPEAKER OR LINE TRANSFORMER SHORTED.
3) OUTPUT IMPEDANCE LOAD MISMATCHED WITH AMPLIFIER
OUTPUT IMPEDANCE SETTING (OVERLOAD).
4) IN CONSTANT VOLTAGE SYSTEMS (25-70 V) THE TOTAL LOAD
POWER REQUIREMENT EXCEEDS THE AMPLIFIER POWER RAT-
ING (OVERLOAD).
5) EXCESSIVELY HIGH SETTING OF ONE OR MORE VOLUME CON-
TROLS.
1) MICROPHONE IS LOCATED TOO CLOSE OR IS FACING SPEAK-
ERS.
2) VOLUME CONTROL SETTING TOO HIGH.
3) TONE CONTROLS
SHOULD BE SET IN THE CUT RANGE.
CAUTION: TO REDUCE THE RISK OF FIRE REPLACE ONLY WITH THE
SAME TYPE OF FUSE.
Procure a Fuse Type: GMA UL
Turn amplifier power switch to the Off position. Remove power cord from AC out-
let. Insert the tip of a cross screwdriver inside the Fuse Holder Cross screw, turn
screw counterclockwise and remove the fuse by pulling outwardly. Replace Fuse
in fuse holder.
This Troubleshooting Chart is provided to the installer as an aid in locating and correcting possible problems that may arise during instal-
lation or after use. This chart should only be used by qualified personnel trained in repair and maintenance of electrical apparatus.
MEM MDM
MDM SERIES