XM-255EX/255NX

SERVICE MANUAL
Canadian Model AEP Model E Model

XM-255EX

UK Model

XM-255NX

Photo : XM-255EX

SPECIFICATIONS

STEREO POWER AMPLIFIER

MICROFILM

TABLE OF CONTENTS

Specifications.... 1

1. GENERAL... 3 2. DISASSEMBLY
2-1. Main Board Removal... 6

3. DIAGRAMS

3-1. Block Diagram.. 7 3-2. Printed Wiring Boards.. 8 3-3. Schematic Diagrams... 9
4. EXPLODED VIEW.. 10 5. ELECTRICAL PARTS LIST. 10

SECTION 1 GENERAL

This section is extracted from instruction manual.

SECTION 2 DISASSEMBLY

Note : Follow the disassembly procedure in the numerical order given.

2-1. MAIN BOARD REMOVAL

1 Two screws (+BTP3x4) 2 Two screws (+BTP3x4)

3 Bottom plate

7 Two screws (+BTP3x8)

4 Screw (+BTP3x8)

8 Screw (+BTP3x4)

6 Two screws (+BTP3x6)

Heat sink
5 Two screws (+BTP3x6) 9 Screw (+BTP3x4) 0 Main board (Remove the direction of arrow)

SECTION 3 DIAGRAMS

3-1. BLOCK DIAGRAM
CNJ101 (4/4) OUTPUT (THROUGH) L INPUT (MONO) CNJ101 (3/4) CNJ301(4P) L HIGH LEVEL INPUT R PRE AMP IC101(1/2) INPUT R OUTPUT (THROUGH) CNJ101 (1/4) CNJ101 (2/4) SW501 TEST TONE OP AMP +B OP AMP 7 VR101 FILTER VR101(1/4),VR101(2/4) 5 LPF IC201(1/2) LPF 7 OFF SW501 FILTER 5 FILTER IC301(1/2) 7 VR102 LEVEL VR102(1/2) SWITCH Q2 VR101 FILTER VR101(3/4),VR101(4/4) VR102 LEVEL VR102(2/2) SWITCH Q401 CN201 SPEAKER OUT DIFFERENTIAL AMP Q403 DRIVE AMP Q404 BIAS Q406,407 DIFFERENTIAL AMP Q402 DRIVE AMP Q405 DRIVE AMP Q409 POWER AMP Q411 OVER LOAD DET Q412 DRIVE AMP Q408 POWER AMP Q410

PRE AMP IC101(2/2)

LPF IC201(2/2) LPF 1

SW501 FILTER 3 OFF

FILTER IC301(2/2) 1
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) For schematic diagrams.
Note: All capacitors are in F unless otherwise noted. pF: F 50 WV or less are not indicated except for electrolytics and tantalums. All resistors are in and 1/4 W or less unless otherwise specified. C : panel designation. U : B+ Line. Power voltage is dc 14.4V and fed with regulated dc power supply from ACC and BATT cords. Voltages and waveforms are dc with respect to ground under no-signal conditions. no mark : POWER ON * : Impossible to measure Voltage are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. Signal path. F : AUDIO

L+R MONO

DIFFERENTIAL AMP Q303
DRIVE AMP Q304 BIAS Q306,307

DRIVE AMP Q308

POWER AMP Q310

DIFFERENTIAL AMP Q302

DRIVE AMP Q305

DRIVE AMP Q309

POWER AMP Q311

OVER LOAD DET Q312

IC401 (1/2)
IC401 (2/2) LINE CONTROL Q941,942 PH901 DC DET
For printed wiring boards.
PROTECT LATCH Q904,905 (CURRENT CHECK)
Note: X : parts extracted from the component side.
PROTECT LATCH Q906,907 (CURRENT CHECK) D904 DRIVER Q946,949 CN101 +12V F901 (20A) B+ SWITCH Q901,902

OFFSET DET Q953-954

ON/OFF DRIVE Q948
T901 DC-DC CONVERTER TRANSFORMER RECT D908,909 +REG Q944 B+ B+
B ON/OFF DRIVE Q947 -REG Q933 B

REMOTE

LED DRIVE SWITCH Q909,910
LED DRIVE SWITCH Q911,913
LED DRIVE SWITCH Q914,915

POWER ON/OFF Q903

Q10 ON/OFF CONTROL 9
DC-DC CONVERTER CONTROL IC901 VCC 12 OSC B+

D907 3

D905 OVER CURRENT

D906 OFFSET

D907 THERMAL
POWER/PROTECTOR Signal path F : AUDIO
3-2. PRINTED WIRING BOARDS

WAVEFORMS

Semiconductor Location
Ref. No. D301 D302 D401 D402 D501 D903 D904 D908 D909 D912 IC101 IC201 IC301 IC401 IC901 Q301 Q302 Q303 Q304 Q305 Q306 Q307 Q308 Q309 Q310 Q311 Q312 Q401 Q402 Q403 Q404 Q405 Q406 Q407 Q408 Q409 Q410 Q411 Q412 Q901 Q902 Q903 Q904 Q905 Q906 Q907 Q908 Q941 Q942 Q943 Q944 Q946 Q947 Q948 Q949 Q963 Q964 Q965 Location
C947 C952 C953 ZD911 J912 R950 C948 E C946 C945 J512 SW501 TEST TONE J911 SW501 C951 J510 J513 R510 C504 C949 R944 R943 R948 R947 C944 R946 Q948 TH902 C943 J945 J913 T901 Q946 Q949 E E S J934 J933 C902 L901 F901

12.8Vp-p

28Vp-p 31 sec

MAIN BOARD

J914 PL901 C933
F-4 G-4 D-4 E-4 B-2 C-5 D-7 A-3 B-3 C-5 F-3 D-3 D-2 B-2 C-6 F-4 G-4 F-4 F-5 G-5 G-5 G-5 G-5 G-5 F-6 G-6 G-6 D-4 E-4 D-4 D-5 E-5 E-5 E-5 D-5 E-5 D-6 E-6 E-6 C-7 C-7 C-7 D-7 D-7 D-7 D-7 D-7 C-5 C-4 A-2 A-2 B-5 A-6 B-6 B-5 C-4 D-4 C-4

31 sec

R945 Q947

J928 D908 J915

R951 Q944 Q943

12Vp-p

F901 20A

56Vp-p 31 sec

R506 R512

R954 R953 Q942 ZD913

C503 D501 R8 J511 R508 R507 IC401 C501 R502 RRR501 C502 R504 C114 SW101 FILTER OFF LPF J126 R216 -4 VR101 VR101 FILTER -3 -2 -1 R212 SW101 J195 C113 C111 J194

R941 R949

C941 J935 C901
IC BLOCK DIAGRAM IC901 TL494CN

REG. REF. 10 9

J916 C950
J917 J918 J919 Q941 C905 R907 C904 R915 D903 R913 J932 J931 CR914 ICR909 R910 Q410 J922 QE
E C961 R955 R965 C962 R962 Q964 Q963 R961

E C930 D912

J944 J943 R902 Q903 E R903

J920 PH901

R215 R115

R963 E R964 E E J921

C213 C211 R112 J122 J121 C210 R213 RIC301 J329 J328 J326 J325 J429 J428 J426 JC112

R959 J923 1

R916 R917 J991

CR911 R912 J936 C909

E ZD901 Q902
ZD902 R904 CN901 V+ GND THR CUR OFF

OSC 7 8

CN901 R938
R905 R906 Q908 E R939 R930 J941 J940
J922 C401 E Q401 R408 R409
C910 Q904 R919 Q906 R920 R921 R923 E E D904 Q905 E R940 Q907 E

Q402 Q403 D401

VR102 LEVEL

J196 J193 VR102

C913 R926

JIC4 J119

(THROUGH)
C202 J118 C201 R210 R110 C105 R211 R111 J192

C212 J117

OUTPUT
J106 C101 C100 J105 J104 J995 C102
J421 J422 J115 J114 J423 J322 C106 R103 R104 CJ323 C107 J427 Q301 R956 R301 E C301 D301 J315 Q303 R302 E E J321 Q310 R318 C308 J952 R326 R325

D906 R935 D907 R929

(MONO)

CNJ101

E TH901

L L+R MONO

E Q404 J412 Q408 R410 E J410 E R404 E R403 C402 Q407 R416 E R414 R405 E E Q405 C404 Q409 R415 R407 R406 R411 Q411 Q406 J491 D402 R413 R412 E R419 E J420 R417 R402

R420 R424 R421 E R422

R924 R925

C912 R922

R401 J411

C118 R117 -2 -1 R217

LED BOARD

CN201 SPEAKER OUT

E Q910 Q914

R426 R425 J431

E Q913

J107 J108 R101 R102 R107

V+ GND

D905 R934

C221 C222

R203 J197 R204 R514

HIGH LEVEL INPUT L

R201 R202 R206 C206

J313 R310 R304
C303 Q304 E J312 C302 C304 R311 J314 Q308 R317 E R316 Q307 E R314 Q309 R319 R315 E Q311 E

Q911 E

CNJ301

J102 J101

J103 J112 J111

CUR OFF

R324 R321 Q312 E R322

C203 J110 J109

1-677-341- 11 2

Q302 R303 R305

R307 R306 E Q305 R313 R308 R309 D302 R312

1-677-608-

3-3. SCHEMATIC DIAGRAMS

SECTION 4 EXPLODED VIEW

NOTE: Items marked * are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items. Color Indication of Appearance Parts Example: KNOB, BALANCE (WHITE). (RED) X X Parts color Cabinets color The mechanical parts with no reference number in the exploded views are not supplied. Hardware (# mark) list and accessories and packing materials are given in the last of this parts list.
SECTION 5 ELECTRICAL PARTS LIST
Due to standardization, replacements in the parts list may be different from the parts specified in the diagrams or the components used on the set. -XX, -X mean standardized parts, so they may have some difference from the original one. Items marked * are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items. RESISTORS All resistors are in ohms METAL: Metal-film resistor METAL OXIDE: Metal Oxide-film resistor F : nonflammable Remark Ref. No. C110 C111 C112 C113 C114 C116 C117 C118 C200 C201 C202 C203 C204 C206 C207 C209 C210 C211 C212 C213 C214 C216 C217 C218 C221 C222 C301 C302 C303 C304 C308 C401 C402 C403 C404 C408 C501 C502 C503 C504 C505 C901 C902 C903 C904 C905 Part No. SEMICONDUCTORS In each case, u: , for example: uA.: A., uPA.: PA., uPB.: PB., uPC.: PC., uPD.: PD. CAPACITORS uF : F COILS uH : H Abbreviation CND: Canadian model G : German model
When indicating parts by reference number, please include the board name.
not supplied #1 D908 #4 #4 Q947 #3 #4 #3 #4 #3 Q948 #3 #3 #3 D909 #2 #2

Ref. No. *

Part No.

Description

Description 0.12uF 0.22uF 0.068uF 4.7uF 4.7uF 100PF 100PF 10PF 100PF 4.7uF 4.7uF 1uF 1uF 10PF 10PF 4.7uF 0.12uF 0.22uF 0.068uF 4.7uF 4.7uF 100PF 100PF 10PF 0.1uF 0.1uF 47uF 33PF 68PF 0.47uF 0.047uF 47uF 33PF 68PF 0.47uF 0.047uF 0.01uF 0.01uF 0.01uF 0.01uF 0.1uF 0.47uF 0.001uF 0.001uF 100uF 22uF 5% 5% 5% 20% 20% 5% 5% 0.50PF 5% 20% 20% 10% 10% 0.50PF 0.50PF 20% 5% 5% 5% 20% 20% 5% 5% 0.50PF 5% 5% 20% 5% 5% 5% 5% 20% 5% 5% 5% 5% 10% 10% 10% 10% 10% 5% 5% 5% 20% 20%

1K 1.5K 10K 1K 1.5K 10K 10K 1K 1.5K 10K 10K
5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5%
1/10W 1/10W 1/10W 1/10W 1/10W 1/10W 1/10W 1/10W 1/10W 1/10W 1/10W
Ref. No. * * * * * * * * * * * * * * * 11 Part No. 3-045-620-01 3-045-620-11 3-045-618-01 3-045-618-11 3-045-622-01 3-045-617-01 3-045-617-11 3-045-616-01 3-045-A619-01 3-045-619-11 3-045-614-01 A-3326-387-A 3-045-615-01 3-045-621-01 3-045-623-01 Description PLATE, ORNAMENTAL (255EX) PLATE, ORNAMENTAL (255NX) PANEL (L) (255EX) PANEL (L) (255NX) BRACKET (HI-LEVEL) HEAT SINK (255EX) HEAT SINK (255NX) HEAT SINK (FET) PANEL (R) (255EX) PANEL (R) (255NX) HOLDER (LED) MAIN BOARD, COMPLETE HEAT SINK (TR) PLATE, BOTTOM COVER Remark
Ref. No. * D905 D906 D907 D908 D909 F901 Q310 Q311 Q410 Q411 Q947 Q948 TH901
Part No. 1-667-609-11 3-048-307-01 8-719-079-03 8-719-079-03 8-719-079-03 8-719-912-51 8-719-918-73 1-532-732-11 8-729-052-06 8-729-052-05 8-729-052-06 8-729-052-05 8-729-051-99 8-729-051-99 1-810-506-21
Description LED BOARD SCREW (P) DIODE LTL-30EFJ DIODE LTL-30EFJ DIODE LTL-30EFJ

1-216-073-00 METAL CHIP

************************************************************** * A-3326-387-A MAIN BOARD, COMPLETE ********************* < CAPACITOR > C100 C101 C102 C103 C104 C105 C106 C107 1-163-251-11 1-126-963-11 1-126-963-11 1-163-227-11 1-127-573-91 CERAMIC CHIP ELECT ELECT CERAMIC CHIP CERAMIC CHIP 100PF 4.7uF 4.7uF 10PF 1uF 5% 20% 20% 0.50PF 10% 50V 50V 50V 50V 16V
DIODE ESAC25-02C DIODE ESAC25-02N FUSE (BLADE TYPE) (AUTO FUSE)(20A) TRANSISTOR KTD718 TRANSISTOR KTB688 TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR THERMISTOR KTD718 KTB688 STP55NE06FP STP55NE06FP NTH5G39B223K01TE
1-126-963-11 ELECT 4.7uF 1-163-227-11 CERAMIC CHIP 10PF 1-127-573-91 CERAMIC CHIP 1uF
20% 50V 0.50PF 50V 10% 16V
Ref. No. C906 C907 C908 C909 C910 C912 C913 C930 C931 C933 C934 C936 C937 C941 C943 C944 C945 C946 C947 C948 C949 C950 C951 C952 C953 C961 C962 Part No. Description 100uF 0.001uF 0.01uF 22uF 22uF 470PF 470PF 47uF 0.1uF 0.001uF 0.22uF 100uF 100PF 0.047uF 2200uF 2200uF 100uF 100uF 0.1uF 3300uF 3300uF 0.1uF 0.1uF 4.7uF 4.7uF 47uF 0.001uF 20% 5% 10% 20% 20% 5% 5% 20% 10% 5% 10% 20% 5% 5% 20% 20% 20% 20% 10% 20% 20% 5% 5% 20% 20% 20% 5% Remark 16V 50V 50V 25V 25V 50V 50V 25V 50V 50V 25V 25V 50V 50V 16V 16V 16V 16V 50V 35V 35V 50V 50V 50V 50V 25V 50V Ref. No. Part No. Description < JACK > J190 J191 J192 J193 J194 J195 J196 J197 J491 J991 J992 J994 J995 1-216-295-00 1-216-295-00 1-216-295-00 1-216-295-00 1-216-295-00 1-216-295-00 1-216-295-00 1-216-295-00 1-216-295-00 1-216-295-00 SHORT SHORT SHORT SHORT SHORT SHORT SHORT SHORT SHORT SHORT 0 Remark 1-126-933-11 ELECT 1-130-471-00 MYLAR 1-163-021-11 CERAMIC CHIP 1-128-551-11 1-128-551-11 1-163-133-00 1-163-133-00 1-107-701-11 1-115-339-11 1-163-275-11 1-115-340-11 1-104-665-11 1-163-251-11 1-130-491-00 1-111-042-11 1-111-042-11 1-126-933-11 1-126-933-11 1-115-339-11 1-126-954-11 1-126-954-11 1-130-495-00 1-130-495-00 1-126-963-11 1-126-963-11 1-107-701-11 1-163-275-11 ELECT ELECT CERAMIC CHIP CERAMIC CHIP ELECT CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP ELECT CERAMIC CHIP MYLAR ELECT ELECT ELECT ELECT CERAMIC CHIP ELECT ELECT MYLAR MYLAR ELECT ELECT ELECT CERAMIC CHIP < CONNECTOR > CN101 CN201 1-694-691-11 TERMINAL BOARD (3P)(REMOTE/+12V/GND) 1-694-690-11 TERMINAL BOARD (4P)(SPEAKER OUT) < JACK > CNJ101 1-779-078-41 JACK, PIN 4P (INPUT/OUTPUT) CNJ301 1-794-219-11 CONNECTOR (4P)(HIGH LEVEL INPUT) < DIODE > D301 D302 D401 D402 D501 D903 D904 D908 D909 D912 8-719-801-78 8-719-801-78 8-719-801-78 8-719-801-78 8-719-801-78 8-719-801-78 8-719-801-78 8-719-912-51 8-719-918-73 8-719-801-78 DIODE DIODE DIODE DIODE DIODE DIODE DIODE DIODE DIODE DIODE 1SS184-TE85L 1SS184-TE85L 1SS184-TE85L 1SS184-TE85L 1SS184-TE85L 1SS184-TE85L 1SS184-TE85L ESAC25-02C ESAC25-02N 1SS184-TE85L Q311 Q312 Q401 Q402 Q403 Q404 Q405 Q406 Q407 Q408 Q409 Q410 Q411 Q412 Q901 Q902 Q903 Q904 Q905 Q906 Q907 8-729-052-05 8-729-034-51 8-729-052-02 8-729-232-66 8-729-014-86 8-729-037-03 8-729-036-90 8-729-900-97 8-729-034-50 8-729-052-04 8-729-052-03 8-729-052-06 8-729-052-05 8-729-034-51 8-729-052-01 8-729-034-50 8-729-034-51 8-729-034-50 8-729-034-51 8-729-034-50 TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR KTB688 KTC3875 KTD1304 2SA1618-YGRTE85L 2SC4207-YGRTE85L KTA1266GR-AT KTC3198BL-AT 2SC1740 KTA1504 KTD600K KTB631K KTD718 KTB688 KTC3875 KTA1023 KTA1504 KTC3875 KTA1504 KTC3875 KTA1504

*************************************************************** MISCELLANEOUS ************* D905 D906 D907 D908 D909 F901 Q310 Q311 Q410 Q411 Q947 Q948 TH901 8-719-079-03 8-719-079-03 8-719-079-03 8-719-912-51 8-719-918-73 1-532-732-11 8-729-052-06 8-729-052-05 8-729-052-06 8-729-052-05 DIODE DIODE DIODE DIODE DIODE LTL-30EFJ LTL-30EFJ LTL-30EFJ ESAC25-02C ESAC25-02N
FUSE (BLADE TYPE) (AUTO FUSE)(20A) TRANSISTOR KTD718 TRANSISTOR KTB688 TRANSISTOR KTD718 TRANSISTOR KTB688
8-729-051-99 TRANSISTOR STP55NE06FP 8-729-051-99 TRANSISTOR STP55NE06FP 1-810-506-21 THERMISTOR NTH5G39B223K01TE
************************************************************** ACCESSORIES & PACKING MATERIALS ******************************* 3-045-623-01 COVER (for POWER TERMINAL) 3-045-651-11 MANUAL, INSTRUCTION (ENGLISH,FRENCH)(255EX:CND,AEP/255NX:UK) 3-045-651-21 MANUAL, INSTRUCTION (GERMAN,RUSSIAN)(255EX:G) 3-045-651-31 MANUAL, INSTRUCTION (SPANISH,PORTUGUESE)(255EX:AEP) 3-045-651-41 MANUAL, INSTRUCTION (DUTCH,SWEDISH)(255EX:AEP) 3-045-651-51 MANUAL, INSTRUCTION (ITALIAN,GREEK)(255EX:AEP) 3-367-410-01 SCREW (DIA. 5X15), TAPPING ************************************************************** ************** HARDWARE LIST ************** #1 #2 #3 #4 7-685-543-21 7-685-545-11 7-685-546-19 7-682-949-01 SCREW +BTP 3X4 TYPE 2 SCREW +BTP 3X6 TYPE 2 N-S SCREW +BTP 3X8 TYPE 2 N-S SCREW +PSW 3X10
1-216-073-00 METAL CHIP 1-216-073-00 METAL CHIP < SWITCH >

SW101 SW501

1-692-721-11 SWITCH, SLIDE (FILTER) 1-771-802-11 SWITCH (TEST TONE) < TRANSFORMER >
1-435-419-11 TRANSFORMER, DC-DC CONVERTER < THERMISTOR >

TH901 TH902

1-810-506-21 THERMISTOR NTH5G39B223K01TE 1-809-664-51 THERMISTOR, POSITIVE

9-870-069-11

Sony Corporation
Mobile Electronics Division Company
2000A090267-1 Printed in Japan 2000. 1 Published by General Engineering Dept.

XM-255EX/255NX

SERVICE MANUAL
Canadian Model AEP Model E Model

XM-255EX

UK Model

XM-255NX

CORRECTION-1
Correct your service manual as shown below.
! : indicates corrected portion.

Ref. No. Q947 Part No.

INCORRECT
Description Remark Ref. No. Q947 Part No.

CORRECT

Description Remark
8-729-051-99 TRANSISTOR STP55NE06FP
8-729-053-51 TRANSISTOR FQPF65N06
Q948 8-729-051-99 TRANSISTOR STP55NE06FP Q948

(ECN-CSA02578)

Note : Replace the set of being using STP55NE06 for Q947 and Q948 with FQPF65N06 with both as well at the time of the repair. And, the set of being using FQPF65N06 for Q947 and Q948 is to exchange only the one that it broke down at the time of the repair.

Sony Corporation

9-870-069-91
Audio Entertainment Group
2000F090255-1D Printed in Japan 2000.6 Published by ME General Engineering Dept.