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18
TROUBLESHOOTING
PROBLEM CAUSE
No sound and power LED is
not lit
• No power or ground at amp
• No remote turn-on signal
• Blown fuse near battery
No sound, a power LED is lit,
and the AIRBASS™ option
has not been added.
• No signal input
• The AIRBASS™ switch is in the "IN" posi-
tion. Move it to the "OUT" position
Fault LED is lit
• Amp power supply fuse is blown or miss-
ing
Repeatedly blown amp fuse,
frequent activation of Smart
Power Supply Circuit
• Speaker or leads may be shorted
• Verify adequate amplifier ventilation
Not enough input sensitivity
while using Balanced input
• Be sure both Left and Right Input Signal
Switches are set to the "BAL" position
Left and Right Input Over-
load indicators lighting
• Input signal level is too high - readjust in-
put gains, or select the 0.5-5V input signal
level range
Alternator whine while using
Unbalanced RCA inputs
• Make sure the Right Input Signal Switch is
in the "UNBAL" position.
• Try the Left Input Signal Switch in the
"BAL" and "UNBAL" position: leave the
switch in the quietest position. This will
not effect the performance of the amplifier.
PROTECTION CIRCUITRY
Your REFERENCE Class A amplifier is protected against both overheating and
short circuits by means of the following circuits:
• Main power supply fuses
• Smart Power Supply Thermal Rollback activating at 85°C.
• A fail-safe thermal protection circuit activating at 95°C.
Your amplifier also incorporates an innovative Fault Diagnosis system that
NOTE: If you experience blown main power supply fuses, DO NOT increase
values beyond the original fuse value! Doing so will void your warranty and may
damage your amplifier. If you blow fuses with the REFERENCE Class A
amplifiers, it is likely that the amplifier is seeing a dead short, either in the speaker
3
TABLE OF CONTENTS
Design Features ................................................................. 4 - 5
AIRBASS™ ............................................................................. 5
Reference Class A 5.0 Diagram ......................................... 6 - 7
Reference Class A 10.0 Diagram ....................................... 8 - 9
Selecting Input Modes ........................................................... 10
Balanced / Unbalanced Input ................................................ 11
Wiring & Wiring Diagram ................................................ 12 - 13
Installation and Mounting ...................................................... 14
Level Setting ......................................................................... 15
LSE.Q Theory and Use .................................................. 16 - 17
Protection Circuitry & Troubleshooting .................................. 18
Service .................................................................................. 19
Specifications ........................................................................ 19