B3/B328/B3158 Bass Amplifier
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.
NO SOUNDNO SOUND
LEDs LIGHTLEDs DONOT LIGHT
Check instrument, cables
Check amp controls, checkCheck AC outlet
for signal from instrumentPOOR SOUNDSOUND OK
OUTLET OKNO POWER
NO SOUNDSOUND OK
Check speaker(s)
Check power cord,Check house fusebox
Listen for humfuse, power switch or circuit breaker
SPEAKER(S) OK,SPEAKER(S)
NO HUMHUMOK
POOR SOUNDDEFECTIVE
Check speakerUnplug instrument,
touch tip of cableReplace speaker(s)
SPEAKER OK
NO CHANGELOUD HUMPOOR SOUNDSOUND OK
SOUND OK
Replace cableCheck bass pickup
NO CHANGESOUND OK
SEE BELOWSEE BELOW
If the problem isnOt 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
PEAK LED
LIMIT LED
B3, B328
TONES9 BAND EQPOWER
INPUTAMP
SPEAKER
OUT
FOOT
SWITCH
-15dBGAINDRIVEEQ ON
BASSTREBLE
PAD
ULTRA MID
B3158LOW LIMIT LED
MASTERLOW
FREQ
BIAMPLOW
POWER
X-OVERSPEAKERAMP
OUT
HIGH LIMIT LED
EFFECTS EFFECTS
SENDRETURNPOST2HIGH
BALANCEFREQ
HIGH
POWER
3AMPSPEAKER
PREOUT
BALANCED
OUT
-20dB
7 |
ACEC
