Ampeg BA500 manual Troubleshooting, System Block Diagram

BA500 Bass Amp Combo

Troubleshooting

In the unlikely event that your BA500 should stop working properly (or just stop working), take a few minutes to trou- bleshoot it before you call for service. You can save yourself a lot of time and sometimes money by doing it yourself, and often the cure for the problem is something quite simple.

NO SOUND

LEDs LIGHT

LEDs DON'T LIGHT

Check amp controls, check

Check AC outlet

for signal from bass

OUTLET OK

NO OUTLET

NO SOUND

SOUND OK

Check power cord,

Check house fusebox

Listen for hum

fuse, power switch

or circuit breaker

NO HUM

HUM

OK

Check speaker

Unplug bass,

touch tip of cable

Speaker OK

NO CHANGE

SOUND OK

Replace cable

NO CHANGE

SEE BELOW

		POOR SOUND
Check bass, cables
		POOR SOUND		SOUND OK
	Check speaker(s)
	SPEAKER(S) OK,		SPEAKER(S)
	POOR SOUND		DEFECTIVE

Replace speaker(s)

POOR SOUND SOUND OK

SEE BELOW

If the problem isn’t covered above, or if the steps lead you here, then contact your Ampeg dealer for service infor- mation. Also, you should refer your amp to an authorized service center for servicing if it gets dropped, has liquid spilled into it, or sustains damage to its power cord. Regular cleaning and maintenance by your local Service Center will help extend the amplifier’s useful life.

System Block Diagram

INPUT

		LIMIT
TUNER		LED	PROTECTION
OUT		POWER AMP	RELAY
PRE	BAL.				SPEAKER
					OUT
	OUT		Thermal Shutdown,
POST		COOLING	Low Voltage,
			DC Protect
		FAN	LIMIT		SPEAKER
PAD	-20dB PAD		POWER AMP		OUT
			IN
		MUTE		1+
			PREAMP	1- 2- SPEAKON
			OUT	2+	JACK
		MASTER
	PEAK/MUTE				EFFECTS
	LED
					LOOP
					RETURN
					EFFECTS
		EQ			LOOP
GAIN		ON			SEND
		9 BAND
		GRAPHIC
	BASS ULTRA MID TREBLE	EQ

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