Instruction/ maintenance manual of the product XS250 Yamaha
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POWER AMPLIFIER XS350 XS250 Owner’s Manual E POWER POWER AMPLIFIER XS SERIES POWER SIGNAL CLIP SIGNAL CLIP PROTECTION CH A CH B ON OFF 350.
2 Introduction Thank you for purchasing a Yamaha XS350, XS250 series power amplifier. This series of audio amps was developed from Yamaha's wealth of experience in building PA equipment and its tradition of careful attention to every detail of circuit design.
3 P recautions Contents Controls and Functions ............................................. 4 Front Panel ........................................................... 4 Rear Panel ........................................................... 5 Speaker Impedance .
4 C ontrols and F unctions ■ F r ont P anel PO WER PO WER SIGNAL CLIP SIGNAL CLIP PRO TECTION CH A CH B ON OFF 3 4 2 1 1 POWER switch and indicator This is the main POWER switch. Press to power ON the amplifier. Press again to power OFF. The POWER indicator lights up when the amplifier is powered ON.
5 ■ Rear P anel B-2 CHANNEL A-2 8-16 Ω (BRIDGE) (–) (+) 4-8 Ω /CHANNEL (STEREO) B-1 CHANNEL A-1 8-16 Ω (BRIDGE) (–) – – + + (+) 4-8 Ω /CHANNEL (STEREO) (BRIDGE) (P ARALLEL) (BRIDGE) (P ARALLEL) FIL TER CHANNEL B CHANNEL A FREQ. FREQ.
6 4 SPEAKERS terminals Two types of speaker output terminals: Binding post (Channel A-1, B-1) and barrier strip (Channel A-2, B-2) are available. These parallel wirings are internally connected and output identical signals simultaneously. The output impedance varies depending on whether you use either or both types of SPEAKERS terminals.
7 ■ Speaker Impedance In STEREO and PARALLEL modes, the minimum load (i.e., speaker) impedance is 4 Ω . In BRIDGE mode it is 8 Ω . Make sure that the impedance does not fall below this specified impedance.
8 Using the barrier strip or terminal posts STEREO mode connections: MODE STEREO PARALLEL BRIDGE Set to STEREO PARALLEL mode connections: MODE STEREO P ARALLEL BRIDGE Set to PARALLEL – – + + SPEAK.
9 Caution for Speaker Connection 1. Turn off the POWER switch. 2. Remove the cover attachment screws and remove the protective cover from the speaker terminals.
10 Rack Mounting ■ Mounting in an EIA standar d rac k If multiple high-power amp units are mounted in a rack with poor ventilation, the heat from the amps will cause the interior of the amp to become very hot, causing the performance of the amps to be impaired.
11 ■ P ortable Rack Mounting This unit uses a forced cooling system in which air comes in through the front opening and goes out from the sides and rear. If you mount a single unit on a portable rack, be sure to maintain vent openings on the rear and sides.
12 Specifications ■ Gener al Specifications XS250 XS350 Power Output Level (Rated Power) 8 Ω /STEREO 170 W + 170 W 230 W + 230 W 20 Hz~20 kHz 4 Ω /STEREO 250 W + 250 W 350 W + 350 W THD+N= 0.1% 8 Ω /BRIDGE 500 W 700 W 1 kHz 8 Ω /STEREO 185 W + 185 W 250 W + 250 W THD+N= 0.
13 ■ Block Diagr am Protector CLIP CLIP MODE OFF LOW CUT SUB WOOFER OFF LOW CUT (P ARALLEL) (BRIDGE) (P ARALLEL) (BRIDGE) INPUT INPUT CHANNEL B CHANNEL A CHANNEL B CHANNEL A + – G G – + INPUT B-.
14 T roubleshooting The following table lists the main causes of abnormal operation and the corrective measures required, as well as the protective circuit operation in each c a se. Protection Circuit Remedy Probable Cause Indicator CLIP indicator lights.
YAMAHA CORPORATION V352950 R1 1 IP 16 Pro Audio Division, #18/3 P .O. Box 3, Hamamatsu, 430-8651, J apan NP Printed in Taiwan.
An important point after buying a device Yamaha XS250 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Yamaha XS250 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Yamaha XS250 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Yamaha XS250 you will learn all the available features of the product, as well as information on its operation. The information that you get Yamaha XS250 will certainly help you make a decision on the purchase.
If you already are a holder of Yamaha XS250, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Yamaha XS250.
However, one of the most important roles played by the user manual is to help in solving problems with Yamaha XS250. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Yamaha XS250 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
