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11
Troubleshooting
In the unlikely event that your B4R should malfunction, take a few minutes to troubleshoot it before you call for ser-
vice. You can save yourself time and money by doing it yourself, and often 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 to an authorized service center 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
POOR SOUND
Check bass, cables
Check speaker(s)
Replace speaker(s)
POOR SOUND
LEDs DON'T LIGHT
Check AC outlet
NO SOUND
NO HUM HUM
Listen for hum
NO CHANGE
SOUND OK
SOUND OK
POOR SOUND SOUND OK
SOUND OK
Check amp controls, check
for signal from bass
Check power cord,
fuse, power switch
Check house fusebox
or circuit breaker
SPEAKER(S) OK,
POOR SOUND
SPEAKER(S)
DEFECTIVE
Check speaker Unplug bass,
touch tip of cable
Speaker OK
Replace cable
NO CHANGE
SEE BELOW SEE BELOW
NO POWEROUTLET OK
OK
LIMIT
DEFEAT
SPEAKON
®
JACK
(MONO
BRIDGE/
BIAMP)
1+
2+
1–
2–
SPEAKON
®
JACK
(A)
SPEAKON
®
JACK
(B)
BINDING
POSTS
(B)
RED
(+)
BLK
(–)
Speakon
®
is a registered trademark of Neutrik AG.
BINDING
POSTS
(A)
RED
(+)
BLK
(–)
1+
2+
1–
2–
2+
2–
1+
1–
0dB
INPUT
-15dB
INPUT
MUTE
TUNER
OUT
GAIN
MASTER
EFFECTS
MIX
STYLE
BASS ULTRA MID TREBLE
TEXTURE
TONE CIRCUITS
PEAK
LED
UNBAL
LINE OUT
BAL
LINE
OUT
PRE
LINE
OUT
PRE/
POST
POST
HIGH
OUT
POWER
AMP IN
(A/MONO)
PREAMP
OUT
(A/MONO)
LOW
OUT
POWER
AMP A
STEREO
BRIDGE MONO
STEREO/
BRIDGED
STEREO
BRIDGE
MONO
FREQ
LEVEL
BAL
POWER
AMP IN
(B)
PREAMP
OUT
(B)
POWER
AMP B
LIMIT
LED
LIMITER
LIMITER
9 BAND
GRAPHIC
EQ
LEVEL
(SLIDERS)
f
(X9)
EQ IN
EFFECTS
RETURN
EFFECTS
SEND
FULL RANGE
BIAMP
BI-AMP
"DOMESTIC"
"EXPORT"
SPKR
OUT
(A)
SPKR
OUT
(A)
SPKR
OUT
(B)
SPKR
OUT
(B)
GROUND
LIFT
B4R Bass Amplifier