Troubleshooting - Gemini X1 Service Manual

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 STAYS ON WITH NO
SPEAKERS CONNECTED AND WITH THE
AMPLIFIER COOLED DOWN.

TROUBLESHOOTING

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 SOUND TECHNICIAN
FOR MORE INFORMATION ON
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
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 4 OHMS PER CHANNEL
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
GROUNDING.
LOCATED. IF
WHEN THE