Pioneer-M25-pwr-sch 维修电路原理图.pdf
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1、 CONTENTS Features. 2 Configuration of the Stereo System. 3 Connection Diagram. 4 Operation. 5 Protective Circuitry . 5 Combinations with the M-25 . 6 Maintenance. 6 Characteristics Charts. 7 Specifications. 8 IMPORTANT NOTICE The serial number for this equipment is located on the bottom plate. Plea
2、se write this serial number on your enclosed warranty card and keep in a secure area. This is for your security. WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. RadioFans.CN 收音机爱 好者资料库FEATURES 120W + 120W Power Amplifier with a Wide Frequency Band and Low
3、Distortion The first stage of the M-25 adopts a dual transistor differential amplifier with a current mirror as the load for a superb stability and gain right from the lowest low fre-quencies to the highest high frequencies. The pre-driver stage consists of a voltage amplifier with a constant curren
4、t circuit as the load, and this makes for a significant improvement in the degree of use of the power voltage, and also for a satisfying gain and linearity. The power stage features a Class-AB pure complementary parallel push-pull circuit with a three-stage Darlington connection. A newly developed p
5、ower transistor called a Ring Emitter Transistor (RET) has been introduced into the new Class-AB circuitry. This feature guarantees an ultra wide frequency range which turns the attributes of the RET to maximum advantage, and also a superior low-distortion response whatever the power rating across a
6、n ultra-low to full power spectrum. The M-25 delivers Continuous Power Output of 120 watts* per channel, min., at 8 ohms from 5 Hertz to 30,000 Hertz with no more than 0.01% total harmonic distortion. In particular, the Class-AB SEPP circuit functions as a Class-A circuit which is highly rated on ac
7、count of its hi-fidelity sound reproduction capabilities with low power outputs (up to 3W/8-ohms). This means that you can enjoy the final sound as you would from a Class-A amplifier. Finally, the pre-driver section contains an over-drive limiter and a power limiter for protecting the power transist
8、ors. This helps to greatly improve the reliability. Twin Transformer Power Supply for Excellent Separation The M-25 is symmetrically designed with completely separate heavyweight class power supplies for each channel. Each employs large-capacity capacitors (two 22,000uF for each channel) which not o
9、nly feature excellent regulation but also have plenty of reserve. Along with the wide-band frequency response, they ensure a superior channel separa-tion and a reproduction of sound which is both clear and full of latent energy. There is also a surge-killer circuit to keep the inrush current from th
10、e power transformers as well as the high current which charges the electrolytic capacitors to the bare minimum, and this feature reduces the load on all of the related parts. 2Highly Dependable Protective Circuitry The M-25 employs a relay type of protective circuit which is equipped with a current
11、detector and an overcurrent detector. This circuit is designed to protect the speakers from unforeseen accidents caused by the genera-tion of current in the output, or from shortcircuiting of the speaker terminals owing to faulty contacts, as well as the power transistors by releasing the output cir
12、cuitry momentarily. Moreover, the output circuit relay is for 4-circuit high current uses and all the circuits are connected in parallel for enhanced reliability. This circuitry can also be counted on to perform muting when the power switch is flipped between ON and OFF. Carefully Selected, High-qua
13、lity Parts Each and every part which makes up the M-25 has been singled out for its quality so that only the best is finally chosen. Among the parts employed are gold-plated input and speaker terminals, printed circuit boards of paper epoxy resin with a high insulation resistance, and printed circui
14、t boards using 70u thick copper foil, low-resistance pure copper plates for parallel connections and for the grounding wire, and non-inductive cement resistors. Esthetically Satisfying and Full-bodied Design The visual appeal of the power transistors and heat sinks mounted on a broad-based silver-to
15、ned aluminum die-cast chassis is what you would expect from a top-quality power amplifier. Just one look at the M-25 is enough to convince you of its tremendous power and stability. *Measured pursuant to Federal Trade Commissions Trade Regulation Rule on Power Output Claims for Amplifiers. RadioFans
16、.CN 收音机爱 好者资料库 CONNECTION DIAGRAM Check that the power is off before you proceed with the connec-tions. Always remember to switch the power off if you decide to change the connections while you are using the model. SPEAKER SYSTEM As shown in Fig. 1, connect the R (right) channel speaker to the M-25s
17、 R speaker output terminals, and the L (left) channel speaker to the M-25s L speaker output terminals. Both speakers are clearly marked with plus and minus polarities (red and white, respectively). The M-25s speaker output terminals are similarly marked. Make sure that you connect like poles (plus t
18、o plus, minus to minus). PREAMPLIFIER As shown in Fig. 2, use the accessory connecting cords to connect the stereo preamplifiers output terminals to the M-25s input terminals. The terminal which is closer to you is for the R (right) channel, and the connector furthest away is for the L (left) channe
19、l. OPERATION 1. Set the preamplifiers controls as follows: Set the preamplifiers power switch to OFF. Set the volume control (attenuator) to the lowest position. If your preamplifier has a tape monitor switch, set it to SOURCE (or OFF). Only when playing back a tape should it be set to ON. 2. Set th
20、e M-25 up as follows: Connect the power plug to the power outlet. If you have connected the power plug to the spare power outlet (SWITCHED: capacity of 800W or more) on the preamplifier, you will be able to switch the preamplifier on and off by operating the power switch on the M-25. 3. Beginning op
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