DB Drive A72500.1 - Manual (Page 11)

4. TROUBLE SHOOTING
NO SOUND ( NO OUTPUT )
1) Please check all connections, cables' rounting, short and voltage at OKUR amplifiers
and headunit
2) Please check built-in or external fuses ,If it is brlown, pls replace with new one.
3) Please check whether speakers work well, you can test speakers by connecting to another amplifier
PROTECTION
1) Please check overload, overheat ( thermal ), short, voltage and DC offset.
2) Minimum working impedance for 2 and 4 channel amplifiers is 2 ohm stereo or 4 ohm mono
Minimum working impedance for all Class D mono amplifiers is
1 ohm for single unit and 2 ohm for linked operation.
3) If the OKUR amplifiers are shut down due to overheat, Reset by turning off the remote input and
alowing time to cool down.
Please make sure there are no airflow obstructions around OKUR amplifiers to prevent thermal
protection
4) A7750.1, A71100.1, A71500.1, A72000.1 and A72500.1 have voltage protection as 8.5V~16V
If Voltage is out of range as above, Platinum series amplifiers will be protected.
POOR BASS RESPONSE
1) Please check speaker polaritys .
WHINING NOISE
1) Engine noise is caused by poor grounding of OKUR amplifiers, headunit, other
components, battery or alternator, so please check all grounding connection.
10