Equipment information

Denon POA-3000 Amplifier
Manufacturer:
Model:
POA-3000
Date:
Category:
Group:
Description:
Stereo Power Amplifier

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The POA-3000 Stereo Power TV Multimedia">Amplifier is among the first series of Denon audio products designed and built in line with the guiding concept of REAL TIME AUDIO TECHNOLOGY, a new term signifying DENON's new approach to reproduction of real music. The POA-3000 is a new Class-A TV Multimedia">Amplifier unit in which the inherently low efficiency associated with Class-A is eliminated by advanced design features. (20 patents pending) Thus, it is capable of high-output operation without sacrificing the advantage of Class-A mode — wider audio band coverage with distortionless amplifying action. 1. 180 W+ 180 W Class-A Freedom from cross-over distortion and switching distortion is accounted for by Class-A, and high output by the new scheme called "real bias circuit" that successfully endows Class-A with high efficiency. Seven of the 20 pending patents reside in this circuit. 2. High-speed power transistors for high-power high-linearity performance Ten power transistors with improved characteristics in the upper frequency range, rated 150 W for Pc and 100 MHz for ft, are used in two parallel rows of 5 transistors each to constitute the power stage. Broader bandwidth, minimized distortion, and excellent linearity particularly in high-out operation with higher frequencies — these are the highlights on the power stage. 3. Distortionless drive for power stage Small-signal transistors with 400 MHz for ft are paralleled to form a cascode emitter-follower drive circuit for borad-band distortionless driving of the power stage to prevent the high-frequency characteristics from deteriorating due mainly to the junction capacitance (Cob) in power transistors, (patents pending) 4. Direct DC servo circuit for assuring clean, clear music This circuit, developed specially for audio amplification, suppresses DC mid-point drift and reduces both TV Multimedia">Amplifier noise level and distorting tendency. It is this circuit that takes credit for significant part of the real-music performance of the POA-3000. (3 patents pending) 5. Large-capacity power source 1 kVA toroidal transformer. Separate-transformer voltage amplification. Newly developed electrolytic capacitor of 100,000 juF of low impedance type. With these elements, a truly powerful source is secured to drive with such a large power as 180 watts for each channel. Inrush current is necessarily large but power switches and other elements are protected by means of large-size cemented resistors and power relays. 6. Protective muting A high-speed protective circuit is built in to instantly respond to each turning on of power supply and to occurrence of abnormal input voltage such as DC voltage. It mutes circuit operation to protect transistors and speakers, making an LED lamp to flicker at the front panel, until a steady state resumes in the power source. (2 patents pending) 7. A thick decorative glass plate accentuates the clean-cut pleasant-to-see front The gloss-finish side plates add to the high-quality styling of the cabinet design. A new display scheme is incorporated: during 5 to 6 seconds of turning on of the power switch, the Denon mark is illuminated and, thenafter, the faces of the two high-grade peak meters are lighted.

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Service Manual
Manual Type:
Service Manual
Pages:
18
Size:
9.48 Mbytes (9939605 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
2020 02 22
MD5:
46fe96a40c64d5a2720bcaa72a3f2bb1
Downloads:
331

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SPECIFICATIONS ... 1 BLOCK DIAGRAM ... 1 METHODE OF ADJUSTMENT ... 2 EXPLODED VIEW OF CHASSIS AND CABINET ... 3 EXPLODED VIEW OF PARTS LIST ... 4 PRINTED CIRCUIT BOARD PATTERNS AND PARTS LIST RADIATOR UNIT ETC-359 ... 5,6 POWER DRIVE (L) UNIT PUX-025 ... 7 ~10 RECT UNIT ETC-361 ... 10 POWER DRIVE (R) UNIT ETC-026 ... 11 - 14 PROTECT UNIT ETC-358B ... 14 POWER SUPPLY UNIT SUX-024B ... 15,16 WIRING DIAGRAM ... 18,19

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User Manual
Manual Type:
User Manual
Pages:
13
Size:
5.70 Mbytes (5975874 Bytes)
Language:
english
Revision:
Manual-ID:
5110817104
Date:
Quality:
Scanned document, all readable.
Upload date:
2020 02 22
MD5:
f2f0bdc3ce20aed45538b80fae0e0f69
Downloads:
339

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GENERAL INSTRUCTIONS FOR PROPER USE ... 3 FEATURES ... 5 SPECIFICATIONS ... 6 FRONT-PANEL ARRANGEMENT AND FUNCTIONAL DESCRIPTION ... 7 REAR-PANEL ARRANGEMENT AND FUNCTIONAL DESCRIPTION ... 8 BLOCK DIAGRAM ... 9 CHARACTERISTICS CURVES ... 10 TROUBLESHOOTING FLOWCHART ... 11

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