Boss Audio Systems PH4000D, PH5000D, PH3000D user manual Troubleshooting, Symptom Possible Remedy

Troubleshooting

If you experience operation or performance problems with this product, compare your installation with the electrical wiring diagram on the previous pages. If problems persist, read the following troubleshooting tips which may help eliminate the problems.

SYMPTOM	POSSIBLE REMEDY
Amplifier will not	Check to make sure you have a good ground connection.
power up.	Check that the Remote Input (Turn-On) has at least 3VDC.
	Check that there is battery power on the (+) terminal.
	Check that there is at least 12v.
	Check all fuses, replace if necessary.
	Make sure that the Protection LED is not illuminated. If it is lit, shut off
	the amplifier briefly, and then repower it.
Protection LED	Check for short circuits on speaker leads.
comes on when	Turn down the volume control on the head unit to prevent overdriving.
amplifier is	Remove speaker leads, and reset the amplifier. If the Protection LED still
powered up.
	comes on, then the amplifier is faulty and needs servicing.
No output.	Check that all fuses are OK.
	Check that amplifier is properly grounded.
	Check that the Remote Input (Turn-On) has at least 3VDC.
	Check that the RCA audio cables are plugged into the proper inputs.
	Check all speaker wiring.
Low output.	Reset the Level Control.
	Check the Crossover Control settings.
Audio present in	Check the RCA interconnect cables.
only one channel.	Check all speaker wiring.
High hiss in the	Disconnect all RCA inputs to the amplifiers. If the hiss disappears, then
speakers.	plug in the component driving the amplifier and unplug its inputs. If the
	hiss disappears at this point, go on until the faulty/noisy component is
	found.
	It is best to set the amplifier's input level control as low as possible. The
	best subjective signal-to-noise ratio is achieved in this manner. Try to set
	the head unit as high as possible (without distortion) and the amp input
	level as low as possible.
Squealing noise	Check for improperly grounded RCA interconnects.
from speakers.
Distorted sound.	Check that the Input Level Control is set to match the signal level of the
	head unit. Always try to set the Input Level as low as possible.
	Check that all crossover frequencies are properly set.
	Check for short circuits on the speaker leads.
Amplifier gets	Check that the minimum speaker impedance for the amp model is correct.
very hot.	Check that there is good air circulation around the amp. In some
	applications, it may be necessary to add and external cooling fan.
Engine noise	This is usually caused by poor quality RCA cables,which can pick up
(static type)	radiated noise. Use only the best quality cables, and route them away
	from power cables.
Engine noise	Check that speaker leads are not shorted to the vehicle chassis.
(alternator	Check that the RCA grounds are not shorted to the vehicle chassis.
whine)	Check that the head unit is properly grounded.

PH3000D/PH4000D/PH5000D Amplifier User’s Manual - page 10