Digital Design M.80b Benutzerhandbuch - Seite 12

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5. TROUBLE SHOOTING TIPS

NO SOUND ( NO OUTPUT )

@ Pls check all connections, cables' rounting, short, voltage at the M / SS-Class and headunit

@ Pls check fuses ,If they are blown or burnt , pls replace with new one.

@ Pls check whether speakers work well, you can test speakers by connecting to another amplifier

PROTECTION

@ Pls check overload, overheat ( thermal ), short, voltage and DC offset.

@ M.80b, M1d and M2c minimum working impedance is 1 ohm for single and 2 ohm for linked

operation.

SS2b, SS4a and SS6 minimum working impedance is 2ohm stereo or 4ohm mono.

@ If the M & SS-Class amplifiers shut down due to overheat, they will be on some minutes later.

Pls make better airflow and no obstruction around the M & SS-Class for thermal protection.

@ The M.80b, M1d, M2c, SS2b, SS4a and SS6 have low and high voltage protection.

Working voltage is 8.5V - 16V. When voltage is lower than 8.5V or higher than 16V, they will be

protected.

@ When over 4V DC comes into the M & SS-Class amplifiers, then, they will be DC protected.

Check whether the M & SS-Class amplifiers work after removing RCA-Input.

If the M-Class amplifiers work, then check DC by checking RCA-input L and R.

When DC is over 4V at input, try by replacing headunit or source unit

DISTORTION

@ Readjust input level and check the speaker quality at another amplifier.

If there is still problem, Replace poor quality speakers with good quality ones

POOR BASS RESPONSE

@ Pls check speaker cables and reverse polarity of one channel

BUZZING SOUND

@ Check the M & SS-Class amplifiers and headunit ground contact.

@ Check Rca Jack and repalce with new one or rerout Rca Jack.

WHINING NOISE

@ Engine noise is caused by poor grounding of the M & SS-Class amplifiers, headunit, other

components, battery or alternator, so pls check all grounding connection.