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7
Troubleshooting
In the unlikely event that your B3/B328/B3158 should malfunction, take a few minutes to troubleshoot it before you call
for service. You can save yourself time and money by doing it yourself, and often the cure for the problem is something
quite simple.
If the problem isn’t covered above, or if the steps lead you here, then contact your Ampeg dealer for service informa-
tion. Also, you should refer your amp for servicing if it gets dropped, has liquid spilled into it, or sustains damage to its
power cord (see page 2).
System Block Diagram
NO SOUND
LEDs LIGHT
Check amp controls, check
for signal from instrument
NO SOUND
Listen for hum
SOUND OK
NO HUM
Check speaker
SPEAKER OK
SOUND OK
HUM
Unplug instrument,
touch tip of cable
NO CHANGE LOUD HUM
Replace cable Check bass pickup
NO CHANGE
SOUND OK
SEE BELOW
LEDs DON’T LIGHT
Check AC outlet
OUTLET OK NO POWER
Check power cord,
fuse, power switch
Check house fusebox
or circuit breaker
OK
NO SOUND
SOUND OK
Check instrument, cables
POOR SOUND
Check speaker(s)
SPEAKER(S) OK,
POOR SOUND
SPEAKER(S)
DEFECTIVE
Replace speaker(s)
SOUND OK
POOR SOUND
SEE BELOW
TONES 9 BAND EQ
PEAK LED
INPUT
GAIN
-15dB
PAD
DRIVE
BASS
ULTRA MID
TREBLE
FOOT
SWITCH
EFFECTS
SEND
EFFECTS
RETURN
EQ ON
MASTER
PRE
-20dB
2
3
POST
BALANCE
LOW
SPEAKER
OUT
LOW
FREQ
POWER
AMP
HIGH
FREQ
POWER
AMP
LOW LIMIT LED
HIGH
SPEAKER
OUT
HIGH LIMIT LED
BIAMP
X-OVER
SPEAKER
OUT
POWER
AMP
LIMIT LED
B3, B328
B3158
BALANCED
OUT
B3/B328/B3158 Bass Amplifier