Gemini GXA 750 Manuel D'instructions 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 60 CYCLE 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.
POWER LED LIGHTS BUT THERE IS NO SOUND
FROM ONE OR BOTH CHANNELS.
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.
• SECONDARY DC FUSES ARE BLOWN (ON EITHER
ONE OR BOTH CHANNELS INDICATING FAILED A
FAILED CHANNEL OR CHANNELS.
(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.
• IF THE FUSE BLOWS A SECOND TIME DISCONTINUE USE AND CONTACT
A QUALIFIED CUSTOMER SERVICE TECHNICIAN
• 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 SOUND TECHNICIAN FOR MORE
INFORMATION ON GROUNDING. IMPROPERLY DONE, SUCH 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
THE SPEAKER CONNECTIONS ARE MADE IN ACCORDANCE WITH THE
SWITCH SETTING.
• VERIFY SPEAKER SYSTEM IMPEDANCES. BE SURE THE TOTAL SPEAKER
SYSTEM IMPEDANCE IS AT LEAST 2 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 4 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 CUSTOMER SERVICE DEPARTMENT OR YOUR
AUTHORIZED DEALER TO SPEAK TO A QUALIFIED SERVICE TECHNICIAN.
• IF ONLY ONE CHANNEL FAILS, THE SECOND MAY STILL OPERATE, BUT
THE UNIT SHOULD BE SERVICED AS SOON AS POSSIBLE. CONTACT THE
GEMINI SERVICE DEPARTMENT OR YOUR AUTHORIZED DEALER TO SPEAK
TO A QUALIFIED CUSTOMER SERVICE TECHNICIAN.