Yamaha XS250 Service Manual
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Yamaha XS250 Service Manual

Power amplifier
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Table of Contents

See also: Owner's Manual
POWER AMPLIFIER
XS250/350
SERVICE MANUAL
CONTENTS
SPECIFICATIONS .................................................................. 3
PANEL LAYOUT .................................................................... 4
DIMENSIONS ........................................................................ 5
BLOCK DIAGRAM ................................................................. 5
CIRCUIT BOARD LAYOUT & WIRING .................................. 6
DISASSEMBLY PROCEDURE ............................................... 7
IC BLOCK DIAGRAM .............................................................10
CIRCUIT BOARDS .................................................................11
INSPECTIONS .......................................................................13
PARTS LIST
011440
PA
1.97K-9636
1.69K-545
Printed in Japan '99.1

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Summary of Contents for Yamaha XS250

  • Page 1 POWER AMPLIFIER XS250/350 SERVICE MANUAL CONTENTS SPECIFICATIONS ..............3 PANEL LAYOUT ..............4 DIMENSIONS ................ 5 BLOCK DIAGRAM ..............5 CIRCUIT BOARD LAYOUT & WIRING ........6 DISASSEMBLY PROCEDURE ..........7 IC BLOCK DIAGRAM .............10 CIRCUIT BOARDS ..............11 INSPECTIONS ...............13...

  • Page 2: Important Notice

    IMPORTANT NOTICE This manual has been provided for the use 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.

  • Page 3: Specifications

    XS250/350 SPECIFICATIONS •General Specifications XS250,XS350 XS250 XS350 Power Output Level (Rated Power) 8 ohm/STEREO 230 W + 230 W 170 W + 170 W 20 Hz~20 kHz 4 ohm/STEREO 350 W + 350 W 250 W + 250 W THD+N= 0.1%...

  • Page 4: Panel Layout

    XS250/350 PANEL LAYOUT Front Panel POWER POWER SIGNAL CLIP PROTECTION CLIP SIGNAL CH A CH B 1 POWER switch and indicator 2 SIGNAL indicators 3 CLIP indicators 4 PROTECTION indicator Rear Panel FILTER CHANNEL B CHANNEL A FREQ. FREQ. –dB –dB...

  • Page 5: Block Diagram

    XS250/350 DIMENSIONS Unit: mm BLOCK DIAGRAM IC102 IC104 IC101...

  • Page 6: Circuit Board Layout & Wiring

    XS250/350 CIRCUIT BOARD LAYOUT & WIRING Top View SUB 5/5 SUB 2/5 Power Transformer SUB 1/5 XS350 Only SUB 4/5 Front View SUB 3/5 SUB 4/5 Wire color 3NC2-V294020...

  • Page 7: Disassembly Procedure

    XS250/350 DISASSEMBLY PROCEDURE Top Cover SUB7 1/5 Circuit Board 1-1 Remove the nine (9) screws marked [410]. The top cover 3-1 Remove the top cover. (See Procedure 1.) can then be removed. (Fig. 1, 2) 3-2 Remove the six (6) screws marked [80a]. The SUB 1/5 circuit board can then be removed.
  • Page 8 XS250/350 PA7 Unit 9-1 Remove the top cover. (See Procedure 1.) 9-2 Remove the front panel. (See Procedure 5.) 9-3 Remove the four (4) screws marked [250]. The PA7 unit with the chassis can then be removed. (Fig. 4) 9-4 Remove the eight (8) screws marked [130]. The PA7 unit can then be removed.
  • Page 9 XS250/350 11. Rear Assembly 11-1 Remove the top cover. (See Procedure 1.) 11-2 Remove the six (6) screws marked [270]. The rear assembly can then be removed. (Fig. 7) [270] Rear assembly [270] [270] [270] [270]: Bonding Tapping Screw-B 4.0X8 MFZN2BL (VR779900)   ...

  • Page 10: Ic Block Diagram

    XS250/350 IC BLOCK DIAGRAM M5238AP (XM085A00) Operational Amplifier +DC Voltage Output A Supply Inverting Output B Input A Non-Inverting Inverting Input A Input B Non-Inverting -DC Voltage Supply Input B...

  • Page 11: Circuit Boards

    XS250/350 XS250/350 XS250/350 CIRCUIT BOARDS SUB 1/5 Circuit Board SUB 3/5 Circuit Board to PA-CN406 Components side SUB 4/5 Circuit Board Components side from T101 SUB 2/5-CN103 PA-CN404 from T101 SUB 2/5 Circuit Board Components side SUB 1/5-CN610 SUB 5/5 Circuit Board...
  • Page 12 XS250/350 XS250/350 XS250/350 PA Circuit Board SUB 2/5-CN101 SUB 2/5-CN301 from FAN Components side to SUB 1/5-CN611 to SUB 3/5-CN501 •SX350 3NA-V2899600 1 •SX250 3NA-V2899500 1...

  • Page 13: Inspections

    XS250/350 INSPECTIONS A STEREO and PARALLEL Operation Before performing any following adjustments, set the unit as follows: Set the ATTENUATIONS at the MAX. Input terminal: Cannon connector pin 2 is HOT, pins 1 and 3 GROUND. MODE switch: STEREO Output terminal:...
  • Page 14 11. Protection Circuitry Test Check that the relay does not work when you apply a sine wave of +5.0 dBu (XS350), +3.0 dBu (XS250) at 10 Hz to the input and adjust the input level to obtain a clipped output wave form.
  • Page 15 XS250/350 13. Signal Indicator Test When a sine wave of 1 kHz, -23 dBu is applied to the input, SIGNAL indicator should light up. B BRIDGE Operation Before performing any following adjustments, set the unit as follows: 1. Set the ATTENUATIONS at MAX.

  • Page 16: Power Amplifier

    XS250/350 POWER AMPLIFIER XS250/350 PARTS LIST CONTENTS OVERALL ASSEMBLY ............. 2 PA UNIT ..................4 ELECTRICAL PARTS ............... 5 Notes: DESTINATION ABBREVIATIONS A : Australian model : Japanese model B : British model U : U.S. model C : Canadian model V : General export model（110V）...
  • Page 17 XS250/350 OVERALL ASSEMBLY 260j UL only 260i 260i 260h 260f 260k 260a 260g 260e 260c 260d 260b...
  • Page 18 部 品 名 REMARKS QTY RANK OVERALL ASSEMBLY 総 組 立 XS350 XS250 260i V N 4 1 3 3 0 0 Bonding Tapping Screw-B 3.0X8 MFZN2BL ボ ン デ ィ ン グ Ｂ タ イ ト 総 組 立...
  • Page 19 PART NO. DESCRIPTION REMARKS QTY RANK PA UNIT Ｐ Ａ ユ ニ ッ ト XS350 XS250 V 2 9 4 1 5 0 0 PA Unit Ｐ Ａ ユ ニ ッ ト XS350 V 2 9 4 1 6 0 0 PA Unit Ｐ...
  • Page 20 名 REF NO. PART NO. DESCRIPTION REMARKS QTY RANK 電 気 部 品 ELECTRICAL PARTS XS350 XS250 Ｐ Ａ シ ー ト XS350 V 2 8 9 9 6 0 0 Circuit Board PA35 (XV023C0) V 2 8 9 9 5 0 0...
  • Page 21 XS250/350 部 品 名 REF NO. PART NO. DESCRIPTION REMARKS QTY RANK ダ イ オ ー ド -306 V D 6 3 1 6 0 0 Diode 1SS133,176,HSS104 D307 I F 0 0 5 5 6 0 Diode 1SS82TD ダ...
  • Page 22 XS250/350 部 品 名 REF NO. PART NO. DESCRIPTION REMARKS QTY RANK カ ー ボ ン 抵 抗 R228 H F 4 5 7 1 5 0 Carbon Resistor 15.0K 1/4 J XS350 R229 H F 4 5 7 1 0 0 Carbon Resistor 10.0K 1/4 J...
  • Page 23 Circuit Board SUB3 5/5 Ｓ Ｕ Ｂ シ ー ト （ ５ ／ ５ ） XS350 (XV419B0) N X 8 2 0 4 4 0 Circuit Board SUB2 1/5 シ ー ト XS250 U,V (XV419B0) *: New parts RANK: Japan only...
  • Page 24 PART NO. DESCRIPTION REMARKS QTY RANK シ ー ト N X 8 2 0 4 5 0 Circuit Board SUB2 1/5 XS250 H,W,B,A (XV419B0) N X 8 2 0 4 6 0 Circuit Board SUB2 2/5 シ ー ト XS250 (XV419B0)
  • Page 25 XS250/350 部 品 名 REF NO. PART NO. DESCRIPTION REMARKS QTY RANK 金 属 被 膜 抵 抗 R107 V 2 9 6 1 1 0 0 Metal Film Resistor 9.1K 1/4 F R108 H F 4 5 6 1 0 0 Carbon Resistor 1.0K 1/4 J...
  • Page 26 XU905A00 Power Transformer 電 源 ト ラ ン ス XS350 A 電 源 ト ラ ン ス XU900A00 Power Transformer XS250 U,V 電 源 ト ラ ン ス XU901A00 Power Transformer XS250 H,W,B 電 源 ト ラ ン ス XU902A00...
  • Page 27 XS250/350 XS250/350 OVERALL CIRCUIT DIAGRAM (PA7, SUB1/5 - SUB5/5) •NJM7815FA (XD853A00) •NJM7915FA (XD854A00) SUB2/5 •REGULATOR •REGULATOR Capactor Mylar Capactor Mylar Capactor OP AMP OP AMP OP AMP OP AMP Ceramic Capactor OP AMP : Mica Capactor OP AMP Rasistor Flame Proot C. Rasistor 1.OUTPUT...

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Xs350

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