Yamaha p2350 p2700

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POWER AMPLIFIERS

@2550/E327oo

SERVICE MANUAL

YAMAHA $2359

o P2350
I
I
t K:
2,5 *
o P2700
I CONTENTS
SPECIFICATIONS .............................................................. I
PANEL LAYOUT ................................................................. 3
BLOCK DIAGRAM ............................................................ 4
PROTECTIVE CIRCUIT OPERATION --------------------------------- 4
DIMENSIONS .............................................. 5
CIRCUIT BOARD LAYOUT & WIRING """" 6
DISASSEMBLY PROCEDURE ----------------- 8
IC BLOCK DIAGRAM ............................... 12
ADJUSTMENTS ................................................................ 12
CIRCUIT BOARDS ............................................................ 14
PARTS LIST

LM , YAMAHA CORP.

HAMAMATSU JAPAN
2.25KT235@P1inted in Japan '90.3

lasso/M700: I

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P2350/P27OO

P2350/P2700

(

IMPORTANT NOTICE

This manual has been provided for theuse of authorized Yamaha Retailers and their service personnel. It
has been assumed that basic service procedures inherent to the industry, and more specifically Yamaha

Products, are already known and understood by the users, and have therefore not been restated

WARNING: Failure to follow appropriate service and safety procedures when servicing this product
may result in personal injury, destruction of expensive components and failure of the
product to perform as specified. For these reasons, we advise all Yamaha product owners
that all service required should be performed by an authorized Yamaha Retailer or the

appointed service representative.

IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute
authorization, certification, recognition of any applicable technical capabilities, or
establish a principle-agent relationship of any form.

The data provided is believed to be accurate and applicable to the unit(s)indicated on the, cover. The
research, engineering, and service departments of Yamaha are continually striving to improve Yamaha
products. Modificationsare, therefore, inevitable and changes in specification are subject to change without
notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributors
Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricit your
body may have accumulated by grounding yourself to the ground buss in the unit heavy
gauge black wires connect to this buss).

IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck a_l| work before

you apply power to the unit.

\

I SPECIFICATIONS

P2700

P2350

POWER OUTPUT LEVEL
STEREO:
350W + 350W; RL = 8 ohms. I = 20 Hz - 20 kHz, THD s 0.1 %
500W + 500W; RL = 4 ohms, I = 20 Hz - 20 kHz, THD S 0.1 %

MONO:
1ooow; RL = 5 ohms, r = 20 Hz - 20 kHz, THD s 0.1 %

STEREO:
175W +175W; RL = 8 ohms. l = 20 Hz -- 20 kHz, THD s 0.1%
250W + 250W; RL = 4 Ohms. f = 20 Hz - 20 kHz, THD S 0.1 %
MONO:
500W; RL = 8 ohms, f: 20 Hz - 20 kHz, THD s 0.1 %

FREQUENCY RESPONSE
0 dB +0.5. -1.5 dB: 7: 10 Hz - 50 kHz. RL = 8 ohms. Pa =1 W

POWER BANDWIDTH
STEREO:
10 Hz - 40 kHz: Pa = I75 W, RL = 3 ohms. THD: 0.1%
10 Hz - 40 kHz; Pa = 250 W, RL = 4 ohms. THD: .1 %
MONO:
10 Hz - 40 kHz; P0: 500 W. RL = 9 ohms, THD= 0.1%

STEREO:
10 Hz - 40 kHz: Pa = 88 W, RL = 8 ohms. THD = 0.1%
10 Hz - 40 kHz; Pa = 125 W, RL = 4 ohms. THD = 0.1%
MONO:
10 Hz - 40 kHz; Pa = 250 W, RL = 8 ohms, THD = 0.1%

TOTAL HAHMONIC DISTORTION (THD)
STEREO:
50.05%; Po =175 W, RL = 9 ohms, f: 20 Hz - 20 kHz
30.07%; P0 = 250 W, RL = 4 ohms, In 20 Hz - 20 kHz
MONO:
50.07%: P0 = 500 W, HI. = 8 ohms. I: 20 Hz - 20 kHz

STEREO:
50.05%; P0 = 88 W, RL = 8 ohms,1= 20 Hz - 20 kHz
50.07%; Po =125 W. RL = 4 ohms. f: 20 Hz -20 kHz
MONO:
50.07%: P0 = 250 W, RL = 8 ohms, f: 20 Hz - 20 kHz

INTERMODULATION DISTORTION (IMD)
STEREO:
50.03%; Po = 175 W, HL = 8 ohms. l= 60 Hz : 7 kHz, 4 :1
50.05%: Pa: 250 W. RL = 4 ohms, i: 60sz : 7 kHz, 4 :1

MONO:

50.05%; P0 = 500 W, BL = 8 ohms, I: 60 Hz 1 7 KHZ, 4 :1

STEREO:
50.03%; P0 = 88 W, RL = 8 ohms. l = 60 Hz : 7 kHz, 4 :1
50.05%: Po =125 W, RL = 4 ohms, f= 60 Hz :7 kHz, 4 :1
MONO:
50.05%; Po = 250 W, FIL = 8 ohms, f: 60 H217 kHz, 4 :1