Gemini XPM-600 Service Manual page 6

SYMPTOM
UNIT DOES NOT PRODUCE SOUND. POWER
LED DOES NOT LIGHT.
POWER LED LIGHTS, BUT NO SOUND IS
PRODUCED BY AMPLIFIER.
SOUND IS PRESENT BUT VOLUME IS TOO
LOW EVEN THOUGH SOURCE DEVICE IS
SET TO A HIGH LEVEL.
LOUD 50/60 HZ OR 100/120 HZ HUM IS
HEARD AT ALL TIMES THROUGH THE
SPEAKER SYSTEMS.
SOUND IS DISTORTED.
PROTECT LED REMAINS LIT OR GOES ON
AND OFF INTERMITTENTLY AFTER USING
AMPLIFIER FOR A SHORT TIME.
FUSE BLOWS INTERMITTENTLY.
PROTECT LED(S) STAY ON WITH NO
SPEAKERS CONNECTED AND WITH THE
AMPLIFIER COOLED DOWN.
CAUSE
• POWER SWITCH NOT IN ON POSITION.
• POWER CABLE NOT CONNECTED TO AMPLIFIER
OR TO OUTLET.
• AC OUTLET NOT ACTIVE.
• MAIN AMPLIFIER FUSE DEFECTIVE.
• NO INPUT SOURCE SIGNAL.
• INPUT SOURCE NOT CONNECTED.
• INPUT CONNECTING CABLE DEFECTIVE.
• SPEAKER(S) NOT CONNECTED.
• SPEAKER CABLE DEFECTIVE.
• SPEAKER SYSTEM(S) INOPERATIVE.
• AMPLIFIER'S LEVEL CONTROLS ARE SET TO
ZERO.
• AMPLIFIER INPUT LEVEL CONTROLS ARE SET
TOO LOW.
• WRONG PIN CONNECTIONS IN CABLES.
• IMPROPER OR DEFECTIVE GROUND
CONNECTION AT INPUTS. IMPROPER OR
DEFECTIVE GROUND AT INPUT SOURCE
DEVICE(S).
• IMPROPER OR DEFECTIVE GROUND
CONNECTION ON AC OUTLET.
• GROUND LOOP THROUGH AC LINE
CONNECTION/RACK MOUNTING.
• DISTORTION OCCURRING IN SOURCE DEVICE.
• INPUT LEVEL IS SET TOO HIGH.
• UNIT IS OPERATING AT EXCESSIVELY HIGH
TEMPERATURE.
• EXTREMELY LOW SPEAKER IMPEDANCE.
• SHORT IN SPEAKER CONNECTORS, SPEAKER
CABLE OR SPEAKER SYSTEM.
• SPEAKER LOAD IMPEDANCE IS TOO LOW.
• TYPE OR RATING OF THE FUSE IS NOT
CORRECT.
• FAILED AMPLIFIER.
Page 6
SOLUTION
• MOVE POWER SWITCH TO ON POSITION.
• CONNECT POWER CABLE TO AC SUPPLY.
• CHECK CONDITION OF OUTLET.
• REPLACE AMPLIFIER MAIN POWER FUSE ON REAR
PANEL WITH CORRECT TYPE AND RATING.
• CHECK FOR PROPER FUNCTION OF INPUT
SOURCE DEVICE.
• CHECK INPUT CABLES AND CONNECTIONS.
REPLACE QUESTIONABLE CABLES WITH KNOWN
GOOD CABLES.
• CHECK SPEAKER CABLES AND CONNECTIONS.
REPLACE QUESTIONABLE CABLES WITH KNOWN
GOOD CABLES.
• CHECK OPERATING CONDITION AND STATUS OF
SPEAKER SYSTEM(S). BE SURE THE LEVEL
CONTROLS ARE PROPERLY SET.
• ADJUST LEVEL CONTROLS AS PER INSTRUCTIONS.
• USE CORRECT CABLES (AS SHOWN ON BACK OF
UNIT).
• CHECK FOR PROPER AC LINE GROUND ON POWER
AMP AND ALL INPUT DEVICES.
• CHECK INPUT CABLES FOR ALL SOURCE DEVICES
AND SIGNAL PROCESSING AS WELL AS INPUT
CABLES TO POWER AMPLIFIER. CHECK POSITION
OF GROUND LIFT SWITCH AS PER INSTRUCTIONS
FOR LIFTING THE GROUND.
• NEVER LIFT THE AC LINE GROUND ON THE POWER
AMPLIFIER. IF YOU ARE NOT TOTALLY FAMILIAR WITH
GROUND LIFTING OR UNIFICATION PROCEDURES,
DO NOT ATTEMPT THEM WITHOUT FIRST CONSULTING
YOUR DEALER OR A QUALIFIED
TECHNICIAN FOR MORE INFORMATION ON
GROUNDING. IMPROPERLY
PROCEDURES CAN POSE A SAFETY AND/OR FIRE
HAZARD.
• CHECK CLIP INDICATORS ON INPUT SOURCE
DEVICES AND RESET LEVELS IF NECESSARY TO
ELIMINATE DISTORTION.
• ADJUST LEVEL CONTROLS AS PER INSTRUCTIONS.
• CHECK THAT AMPLIFIER IS ADEQUATELY
VENTILATED ON THE FRONT AND REAR PANELS
WHERE THE AIR VENTS AND FANS ARE LOCATED.
IF OVERHEATED, LET THE AMPLIFIER COOL DOWN
BEFORE APPLYING AN INPUT SIGNAL.
• CHECK THE POSITION OF OPERATION MODE
SWITCH. BE SURE THAT
CONNECTIONS ARE MADE IN ACCORDANCE WITH
THE SWITCH SETTING.
• VERIFY SPEAKER SYSTEM IMPEDANCES. BE SURE
THE TOTAL SPEAKER SYSTEM IMPEDANCE IS AT
LEAST 4 OHMS PER CHANNEL WHEN THE
OPERATION MODE SWITCH IS IN THE STEREO
POSITION OR PARALLEL MONO POSITION. IF THE
SWITCH IS IN THE BRIDGE MODE, THE IMPEDANCE
MUST BE AT LEAST 8 OHMS. IF YOU ARE NOT SURE
OF YOUR TOTAL SPEAKER IMPEDANCE LOAD,
CONTACT YOUR DEALER FOR MORE INFORMATION.
• CHECK CONDITION OF SPEAKER CABLES.
• IF USING BARE WIRE CONNECTIONS ON THE
OUTPUTS OF THE AMPLIFIER, BE SURE THAT NO
STRANDS FROM ONE CONNECTOR ARE TOUCHING
ANY OTHER CONNECTOR.
• CHECK FOR SHORTS ON THE OUTPUTS.
• CHECK YOUR SPEAKER IMPEDANCE (INFO FROM
DEALER).
• CHECK THAT THE FUSE TYPE AND RATING IS
CORRECT.
• CONTACT THE GEMINI SERVICE DEPARTMENT OR
YOUR AUTHORIZED DEALER TO SPEAK TO A
QUALIFIED SERVICE TECHNICIAN. IN THE U.S.A.
CALL TOLL FREE 1-800-476-8633
SOUND
DONE, SUCH
THE SPEAKER