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18
PROTECTION CIRCUITRY
Your REFERENCE404s amplifier is protected against both overheating and
short circuits by means of the following circuits:
• Auto High Current™ power supply
• Main power supply fuses
• Circuit breaker on each channel
• 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
identifies a blown power supply fuse.
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
TROUBLESHOOTING
PROBLEM CAUSE
No sound and LEDs
are not lit
• no power or ground at amp
• no remote turn-on signal
• blown fuse near battery
Fault LED is lit
• amp power supply fuse is blown or missing
Repeatedly blown
amp fuse, frequent
activation of Smart
Power Supply Circuit
• speaker or leads may be shorted
• verify adequate amplifier ventilation
Channels 1,2,3 or 4
experiencing inter-
mittent output
• activation of the internal circuit breakers.
• check to make sure channels 1-4 are driving a
1/2 ohm per channel load or greater
• speaker or leads may be shorted
No output from
channels 3 & 4 with
1 pair of RCA inputs
• Select "Internal from ch's 1 & 2" on Ch 3 & 4
input on the bottom of the amplifier. (see
pages 14 - 17)
3
TABLE OF CONTENTS
Design Features ................................................................. 4 - 5
REFERENCE404s Diagram ............................................... 6 - 7
Auto High Current™ Power Supply ......................................... 8
Selecting Input Modes ............................................................. 9
Wiring (with Diagram) ..................................................... 10 - 11
Installation and Mounting ...................................................... 12
Level Setting ......................................................................... 13
System Installation Diagrams .......................................... 14 -17
Protection Circuitry ................................................................ 18
Troubleshooting .................................................................... 18
Service .................................................................................. 19
Specifications ........................................................................ 19