Manual Boston Acoustics gt 40 (page 18 of 19) (English)

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Ampliﬁer Troubleshooting Guide

Status LEDs on Ampliﬁer not Lit—Head Unit (Source) Turned “ON”

Verify Remote turn-on wire from source to ampliﬁer has proper voltage

Power (B+) connections at ampliﬁer, terminal blocks, and battery are secure

Ground (GND) connections at ampliﬁer and vehicle chassis are secure

Battery B+ fuse is OK

Ampliﬁer fuse is OK

B+ at battery and B+ at ampliﬁer have proper voltage

Status LEDs Lit, no Output from Speakers—

Speakers in Normal Operating

Condition

Verify High-level cables from speaker(s) to ampliﬁer are securely connected

RCA cables from ampliﬁer to source are securely connected

Sensitivity adjustment on ampliﬁer is correctly adjusted

Engine Noise from Speaker(s)

Turn source “OFF”

Disconnect RCA cables at ampliﬁer

If noise stops, check equipment & cables leading to ampliﬁer

Verify RCA cables are of good quality with no breakage to internal shields

RCA cables from source to ampliﬁer are not run alongside power

Ampliﬁer Output Distorted—Music not Recorded with Intentional Distortion

Verify Source output to ampliﬁer is not distorted

Ampliﬁer input sensitivity is correctly adjusted

Ampliﬁer Shuts Down, Red and Green LEDs are Lit—Ampliﬁer is in Thermal

Protection Mode

Verify Ampliﬁer is mounted with adequate air circulation around vents

Ampliﬁer does not have obstructions blocking back or side panel vents

Ampliﬁer is not mounted under carpet

Speakers meet correct impedance for application (mono or stereo hookup)

Ampliﬁer Does Not Turn “ON”, and Red LED is Lit—Ampliﬁer not Connected to

a Shorted Speaker

Verify Speaker crossover is not defective

High-level cables from speaker to ampliﬁer are not shorted

Ampliﬁer Does Not Turn “ON”, and Red LED Lit—Speakers, Crossovers, and

Cable are OK

Ampliﬁer requires service

GT-40_manual 4/10/03 4:17 PM Page 18

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Boston Acoustics gt 40 Manual

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