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Anleitung Zusammenfassung
This control allows an adjustment of +/-15dB at 5kHz. 10. ULTRA HIGH: This switch, when depressed, increases the high frequency output by 8dB at 10kHz. 11. EFFECTS BLEND: Use this control to adjust the level of external effects that are connected to the Effects Send and Return jacks (#21 and #20, rear panel). With this control in the fully counterclockwise position no effect is applied to the signal. As you rotate the control clockwise the level of the effect increases and the level of “dry” signal decreases. NOTE: When using the effects loop with a compressor/limiter, this control must be rotated fully clockwise for optimum results. 12. LIMIT: This LED illuminates when the internal limit circuit is activated. This indicates that the amplifier is nearing full output and the limiter is keeping the amplifier from clipping the output signal. 13. MASTER: Use this control to adjust the output level of the amplifier. If the Limit LED illuminates, reduce this control until the Limit LED only flashes on strong signals. 14. POWER ON INDICATOR: This light illuminates when the amplifier is turned on. 15. POWER: Use this switch to apply power to the amplifier. The amp is on when the top of the switch is depressed and off when the bottom of the switch is depressed. PBC228 PortaBass Amplifier The Rear Panel: 17 18 19 20 222116 2423 16. AC LINE IN: Firmly insert the female end of the supplied AC power cord into this socket. The grounded power cord should only be plugged into a grounded power outlet that meets all applicable electrical codes and is compatible with the voltage, power, and frequency requirements stated on the rear panel. Do not attempt to defeat the safety ground connection. 17. CIRCUIT BREAKER: The circuit breaker protects the unit from damage caused by excessive current demands. If the amplifier stops working, check the circuit breaker. If it has opened, the button will protrude showing a contrasting color. Reset the circuit breaker by depressing it until it latches. The breaker must cool down for a short time before the button will latch. If the circuit breaker opens repeatedly, have the amplifier inspected by a qualified service person. 18. EFFECTS SEND: When using an external effect, connect this jack to the effect’s input by means of a shielded signal cable. 19. EFFECTS RETURN: When using an external effect, connect the effect’s output into this jack by means of a shielded signal cable. 20. LINE OUT: Use this 1/4” jack to send a post-EQ line level signal to an external amplifier, mixing console or recording equipment. 21. LEVEL: Use this control to adjust the level of the signal at the Transformer Bal. Line Out jack (#22). 22. TRANSFORMER BAL. LINE OUT: Use this XLR jack to send a line level signal to an external amplifier, mixing console or recording equipment. The signal at this jack may be pre or post-EQ, depending on the setting of the Pre/Post switch (#23). 23. PRE/POST: This switch determines whether the signal at the Transformer Bal. Line Out jack (#22) is pre-EQ (switch out) or post-EQ (switch depressed). 24. LIFT/GND: This switch, when depressed, isolates the chassis from the ground pin of the Transformer Bal. Line Out jack (#22) . This may reduce residual hum and buzz which is sometimes picked up by line out signal cables. PBC228 PortaBass Amplifier Troubleshooting In the unlikely event that your PBC228 should malfunction, take a few minutes to troubleshoot it before you call for service. Sometimes you can save yourself time and money by doing it yourself, and often the cure for the problem is simple. If the problem isn’t covered above, or if the steps lead you here, then contact your Ampeg dealer for service information. Also, you should refer your amp to an authorized service center for servicing if it gets dropped, has liquid spilled into it, or sustains damage to its power cord (see page 3). PBC228 PortaBass Amplifier System Block Diagram CHANNEL 1 MID MID FREQ SPEAKER SPEAKER CHANNEL 2 MID MID FREQ PBC228 PortaBass Amplifier Technical Specifications OUTPUT POWER RATING 200 Watts RMS, internal speaker load TONE CONTROLS Ultra Low: +6dB @ 40Hz Low: ±16dB @ 100Hz Mid: ±17dB @ Selected Frequency Mid Freq: 180Hz - 1.8kHz High: ±15dB @ 5kHz Ultra High: +8dB @ 10kHz GAIN 65dB SIGNAL TO NOISE RATIO 80dB typical INTERNAL SPEAKERS (2) 8”Neodymium, 8 ohm, 150 W, 2” vcd LINE POWER REQUIREMENTS 50VA SIZE AND WEIGHT 16.25” W x 16.25” H x 11” D; 31 lbs. Ampeg reserves the right to change specifications without notice. Declaration of Conformity Manufacturer’s Name: SLM Electronics Corporate Headquarters: 1901 Congressional Drive, St. Louis, Missouri 63146 Primary Production Facility: 700 Hwy 202 W, Yellville, Arkansas, 72687 Product Type: Audio Amplifier Products meet the regulations for compliance marking under: ETL standards UL6500, UL60065, or UL813 CSA standards E60065 or C22.2 No.1-M90 CE safety standard EN60065 CE EMC standards EN55103 or EN55013 and EN61000 C-tick designation Level 2, ABN #567488...