B4R Bass Amplifier
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.
NO SOUND |
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| LEDs DON'T LIGHT |
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| Check amp controls, check |
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| Check AC outlet |
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| for signal from bass |
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| OUTLET OK |
| NO POWER |
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| NO SOUND |
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| SOUND OK |
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| Check power cord, |
| Check house fusebox | ||||||
Listen for hum |
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| fuse, power switch |
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NO HUM | HUM | OK |
Check speaker |
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| Unplug bass, | ||||||
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| touch tip of cable | |||
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| Speaker OK |
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| NO CHANGE |
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| SOUND OK |
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| Replace cable |
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NO CHANGE
SEE BELOW |
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| POOR SOUND |
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Check bass, cables |
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| POOR SOUND |
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| SOUND OK |
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| Check speaker(s) |
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| SPEAKER(S) OK, |
| SPEAKER(S) |
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| POOR SOUND |
| DEFECTIVE |
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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 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
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| PEAK |
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| LED |
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| TUNER |
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| OUT |
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0dB |
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INPUT |
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| MUTE |
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| GAIN |
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INPUT |
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| UNBAL |
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| LINE OUT |
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PRE |
| FREQ | BAL |
| BAL |
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| LINE | LINE |
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POST | OUT |
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OUT |
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| PRE/ |
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| POST | GROUND |
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| LIFT |
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| LEVEL |
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MASTER |
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| EFFECTS |
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| SEND |
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EFFECTS |
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MIX |
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| EFFECTS |
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| RETURN |
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| BIAMP | |
TEXTURE |
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TONE CIRCUITS |
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| 9 BAND |
| GRAPHIC | |
BASS ULTRA MID TREBLE |
| EQ |
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| (X9) |
STYLE | f | LEVEL |
| (SLIDERS) | |
HIGH |
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OUT |
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LIMIT |
| SPKR |
DEFEAT |
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| POWER | OUT |
LOW | (A) | |
AMP A |
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OUT |
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LIMITER |
| SPKR |
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| OUT |
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| (A) |
| POWER |
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BRIDGE MONO | AMP IN |
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| (A/MONO) |
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STEREO | PREAMP |
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LIMIT | OUT |
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(A/MONO) |
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LED |
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| SPKR |
STEREO/ | POWER | OUT |
(B) | ||
BRIDGED | AMP B |
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LIMITER |
| SPKR |
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| OUT |
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| (B) |
BRIDGE | POWER |
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MONO | AMP IN |
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| (B) |
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STEREO | PREAMP |
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| OUT |
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| (B) |
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EQ IN
"DOMESTIC"
BINDING |
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POSTS |
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(A) |
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RED |
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(+) |
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BLK |
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"EXPORT" | |||
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| 1+ |
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1– | 2– | SPEAKON® | |
| JACK | ||
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| (A) | |
| 2+ |
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| 1+ | SPEAKON® | |
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1– | 2– | JACK | |
(MONO | |||
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| BRIDGE/ | |
| 2+ | BIAMP) | |
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| 1+ |
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1– | 2– | SPEAKON® | |
| JACK | ||
BINDING |
| (B) | |
POSTS | 2+ |
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(B) |
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RED |
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(+) |
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BLK |
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Speakon® | is a registered trademark of Neutrik AG. | 11 |
FULL RANGE |
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