Ampeg B3158, B328 manual Troubleshooting, System Block Diagram

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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 SOUND

 

 

LEDs LIGHT

 

 

 

LEDs DON’T LIGHT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check amp controls, check

 

 

 

 

 

 

 

 

Check AC outlet

 

 

 

for signal from instrument

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTLET OK

 

 

NO POWER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO SOUND

 

 

SOUND OK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check power cord,

 

Check house fusebox

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Listen for hum

 

 

 

 

 

 

 

 

 

fuse, power switch

 

or circuit breaker

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO SOUND

Check instrument, cables

 

 

POOR SOUND

 

 

 

SOUND OK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check speaker(s)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

OK

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 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

INPUT

 

 

PEAK LED

 

 

TONES

 

 

FOOT

-15dB

GAIN DRIVE

SWITCH

TREBLE

PAD

BASS

ULTRA MID

9 BAND EQ

EQ ON

MASTER

B3, B328

B3158

BIAMP

X-OVER

LIMIT LED

POWER

AMP

SPEAKER

OUT

LOW LIMIT LED

LOW

 

 

FREQ

 

 

LOW

POWER

 

 

SPEAKER

AMP

 

 

 

 

OUT

 

 

 

 

 

 

 

 

 

 

 

EFFECTS

EFFECTS

 

 

SEND

RETURN

POST

2

 

 

 

BALANCE

 

 

PRE

3

 

 

BALANCED

 

 

 

 

 

 

OUT

 

 

 

-20dB

HIGH LIMIT LED

HIGH

FREQ

HIGH

POWER SPEAKER

AMPOUT

7

Image 7
Contents B3 / B328 / B3158 Important Safeguards and Precautions FeaturesAn Introduction to your new Ampeg Bass Amplifier Front Panel Controls and Their Use Ground Prong of the AC Plug Rear PanelAlto EL Borne DE Tierra DE LA CLAV- IJA DE CA Funk Popping Some Suggested SettingsSystem Block Diagram TroubleshootingOutput Power Rating Technical Specifications

B3158, B3, B328 specifications

The Ampeg B328, B3, and B3158 are part of Ampeg's esteemed lineup of bass amplifiers, cherished by musicians for their power, clarity, and versatility. Each model presents unique features and innovative technology that cater to different playing styles and musical genres.

The Ampeg B328 is a compact yet powerful combo amplifier designed for both practice and live performances. It features a 200-watt output, delivering rich and punchy sound that is perfect for any stage or rehearsal setting. The B328 includes a 8-inch speaker combined with a high-frequency tweeter, providing a broad frequency response. One of its standout features is the built-in limiter, which protects against distortion and overload, ensuring clean sound at high volumes. Additionally, the Equalization (EQ) section comprises three band EQ controls allowing players to shape their tone, complemented by an Ultra Low and Ultra High switch for enhanced tonal flexibility.

The Ampeg B3 amplifier is a versatile and portable solution for bassists on the go. With its robust 300-watt output, it is ideal for both practice and performances. This model also utilizes a 12-inch speaker for powerful low-end response. A key feature of the B3 is its blending of traditional tube sound with modern digital technology. It includes a Tube Gain control, providing users with the warmth associated with all-tube amplifiers and the reliability of solid-state circuitry. The B3 also boasts a comprehensive EQ section, enabling users to fine-tune their sound. Furthermore, it has a headphone output for silent practice, and a direct output for easy recording or PA connection, increasing versatility in various settings.

Lastly, the Ampeg B3158 features a unique combination of a 15-inch speaker and a built-in compressor, delivering an impressive 350 watts of power. This amps excels in producing deep, resonant lows that are characteristic of Ampeg’s iconic sound. The B3158 is equipped with a four band EQ that allows extensive tone shaping and includes a presence control for enhancing high frequencies. It also features a cabinet that is designed for portability without compromising sound quality. Another important aspect of the B3158 is its dual input channels, which provide flexibility for connecting multiple instruments or effects.

Overall, the Ampeg B328, B3, and B3158 serve a broad range of musical applications. From gigging musicians to studio recording, these amplifiers offer fundamental features, advanced technologies, and exceptional sound quality that underline Ampeg's commitment to innovation and performance in the world of bass amplification.