Pioneer XR-A550MD Service Manual
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Pioneer XR-A550MD Service Manual

Pioneer XR-A550MD Service Manual

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3 7 63 1515 0
COMPACT MINI COMPONENT
XR-A550MD
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
TE
L 13942296513
Model
Type
XR-A550MD
KUCXJ
DBDXJ
CONTENTS
1. SAFETY INFORMATION ...................................... 2
3. SCHEMATIC DIAGRAM ..................................... 16
4. PCB CONNECTION DIAGRAM .......................... 42
5. PCB PARTS LIST ............................................... 62
6. ADJUSTMENT .................................................... 70
www
.
PIONEER ELECTRONIC CORPORATION
PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936
c
PIONEER ELECTRONIC CORPORATION 1999
http://www.xiaoyu163.com
Power Requirement
AC120V
AC110-127V/220-230V/240V
x
ao
u163
y
i
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
http://www.xiaoyu163.com
2 9
8
STEREO CD MD CASSETTE DECK RECEIVER XR-A550MD
MD
3
NR
FREQ/
STATION
ON/OFF
ASES
MD
TAPE
REC/STOP
REC/STOP
DISP
EJECT
/CHARA
MENU
DELETE
STEREO CASSETTE DECK
REC/PLAY
FULL LOGIC AUTO REVERSE
MINIDISC
Q Q
3
6 7
1 3
1 5
7. GENERAL INFORMATION ................................ 92
7.1 PARTS .......................................................... 92
7.1.1 IC ........................................................... 92
7.1.2 DISPLAY ................................................ 94
7.2 DIAGNOSIS .................................................. 96
7.2.1 DISASSEMBLY ..................................... 96
7.2.3 TROUBLESHOOTING ........................ 104
7.3 BLOCK DIAGRAM ...................................... 109
co
.
9 4
2 8
ORDER NO.
RRV2107
0 5
8
2 9
9 4
2 8
The Voltage can be converted by
the following method.
With the voltage selector
m
T - IZE MAR. 1999 Printed in Japan
9 9
9 9

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  • Page 1: Table Of Contents

    PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A. PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936 PIONEER ELECTRONIC CORPORATION 1999 T –...

  • Page 2: Safety Information

    The use of a substitute replacement component which does Leakage 0.5mA current Device not have the same safety characteristics as the PIONEER tester under recommended replacement one, shown in the parts list in test this Service Manual, may create shock, fire, or other hazards.

  • Page 3: Exploded Views And Parts List

    See Contrast table (2) (0.03 × 230 × 340) (English/Spanish) Front Pad XHA3003 (2) CONTRAST TABLE XR-A550MD/KUCXJ and DBDXJ are constructed the same except for the following : Part No. Mark No. Symbol and Description Remarks KUCXJ Type DBDXJ Type...
  • Page 4 XR-A550MD 3 7 63 1515 0 2.2 EXTERIOR (1/2) KUCXJ Type Only Note : Attatch on the same numbers × three L 13942296513 Refer to "2.5 $M MECHA CD DIGITAL ASSY u163 http://www.xiaoyu163.com...
  • Page 5 • • • • • Cushion Rubber XEB3002 Tray Cap Assy XXG3031 L 13942296513 (2) CONTRAST TABLE XR-A550MD/KUCXJ and DBDXJ are constructed the same except for the following : Part No. Mark No. Symbol and Description Remarks KUCXJ Type DBDXJ Type...
  • Page 6 XR-A550MD 3 7 63 1515 0 2.3 EXTERIOR (2/2) KUCXJ Type Only DBDXJ Type Only L 13942296513 Refer to "2.7 MD MECHANISM ASSY". Refer to "2.4 FRONT PANEL SECTION". u163 http://www.xiaoyu163.com...
  • Page 7 See Contrast table (2) Fuse (FU2, FU3 : T1.6A) See Contrast table (2) L 13942296513 (2) CONTRAST TABLE XR-A550MD/KUCXJ and DBDXJ are constructed the same except for the following : Part No. Mark No. Symbol and Description Remarks KUCXJ Type...
  • Page 8 XR-A550MD 3 7 63 1515 0 2.4 FRONT PANEL SECTION 34(1/2) 34(2/2) L 13942296513 Refer to "2.8 MECHANISM UNIT". u163 http://www.xiaoyu163.com...
  • Page 9 GND Plate C XNG3012 Cushion A PED1001 Cord with Plug DE007VE0 L 13942296513 (2) CONTRAST TABLE XR-A550MD/KUCXJ and DBDXJ are constructed the same except for the following : Part No. Mark No. Symbol and Description Remarks KUCXJ Type DBDXJ Type DISPLAY Assy...
  • Page 10 XR-A550MD 3 7 63 1515 0 2.5 $M MECHANISM CD Refer to "2.6 SERVO MECHANISM ASSY". L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 11 XR-A550MD 3 7 63 1515 0 2.6 SERVO MECHANISM ASSY • $M MECHANISM CD PARTS LIST Mark No. Description Part No. MOTOR Assy AWZ8428 SW Assy AWZ8429 CD Assy XWZ3141 • • • • • Servo Spring ABH7126 Belt...
  • Page 12 XR-A550MD 3 7 63 1515 0 2.7 MD MECHANISM ASSY L 13942296513 PWB-B 59 x2 59 x2 PWB-A 67 x4 u163 61 x3 http://www.xiaoyu163.com...
  • Page 13 XR-A550MD 3 7 63 1515 0 • MD MECHANISM ASSY PARTS LIST Mark No. Description Part No. Mark No. Description Part No. Loading Gear Shaft 1242900108 Bottom Cover 1243230028 MD Guide (B) 1242000209 Cushion (A) 1243260020 Base Frame 1242000210...
  • Page 14 XR-A550MD 3 7 63 1515 0 2.8 MECHANISM UNIT L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 15 XR-A550MD 3 7 63 1515 0 L 13942296513 • MECHANISM UNIT PARTS LIST Mark No. Description Part No. Plate HD BLK F513-811 Plate HD BLK F513-825 Motor Main BLK F525-324 • • • • • • • • • •...

  • Page 16: Schematic Diagram

    XR-A550MD 3 7 63 1515 0 3. SCHEMATIC DIAGRAM 3.1 OVERALL WIRING DIAGRAM DISPLAY ASSY DECK MECHA (KUCXJ TYPE : XWZ3174) DECK I R/P HEAD (DBDXJ TYPE : XWZ3183) ERASE HEAD AF ASSY (KUCXJ TYPE : XWZ3172) (DBDXJ TYPE : XWZ3181)
  • Page 17 XR-A550MD 3 7 63 1515 0 Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST". MD LED ASSY (KUCXJ TYPE : XWZ3180) (DBDXJ TYPE : XWZ3189) MD FRONT ASSY...
  • Page 18 XR-A550MD 3 7 63 1515 0 3.2 FM/AM TUNER MODULE MIX AMP RF AMP 1T378A BUFFER IF AMP L 13942296513 FM +B SW MW RF TUNING BLOCK AXX7041 FM/AM TUNER MODULE (AXQ7065) u163 http://www.xiaoyu163.com...
  • Page 19 XR-A550MD 3 7 63 1515 0 AF AMP AF AMP L 13942296513 REGULATOR u163 http://www.xiaoyu163.com...
  • Page 20 XR-A550MD 3 7 63 1515 0 3.3 CD, MOTOR and SW ASSEMBLIES L 13942296513 CD ASSY (XWZ3141) MOTOR ASSY (AWZ8428) CARRIAGE MOTOR u163 J8503 D20PWW0405E SERVO MECHANISM ASSY (AXA7039) http://www.xiaoyu163.com...
  • Page 21 XR-A550MD 3 7 63 1515 0 Note: The encircled numbers denote measuring point in the schematic diagram. CN8005- Pin 1 : PLAY MODE (RF) H : 500nsec/div 1.8Vp-p VREF CN8005- Pin 2 : TEST MODE, Tracking Open(TRER) H : 5msec/div...
  • Page 22 XR-A550MD 3 7 63 1515 0 3.4 PWB-A (MD MAIN ASSY) and PWB-B (MD MECHANISM SWITCH ASSY) R1211 PWB-A (MD MAIN ASSY)(1246840167) TP1141 TP1131 C1107 C1111 C1110 TP1275 0.015 0.0047 0.47 TP1142 C1106 0.47 99 98 97 96 95 94 93 92 91 9...
  • Page 23 XR-A550MD 3 7 63 1515 0 PWB-B R1211 C1208 (MD MECHANISM SWITCH ASSY) 0.047 100K – insert circuit and measure. SW 1952: DIRECT ON-OFF 270P SW 1953: LEAD IN ON-OFF TP1210 SW 1954: PLAYBACK ON-OFF SW 1955: RECORDING ON-OFF...
  • Page 24 XR-A550MD 3 7 63 1515 0 Voltages of PWB-A (MD MAIN ASSY) Q1251 IC1916 Q1801 IC1907 IC1101 IC1201 IC1401 IC1601 NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE NO. VOLTAGE VOLTAGE 4.4V...
  • Page 25 XR-A550MD 3 7 63 1515 0 WAVEFORMS PLAY STATUS PIT PLAY Stopped Stopped 1997 / 08 / 04 09:30:15 NORM: 100M S/s NORM: 1M S/s 1997 / 08 / 04 13:35:24 Filter CH1 500mV Filter 500ns/div 200mV 1ms/div SMOOTH...
  • Page 26 XR-A550MD 3 7 63 1515 0 PLAY Stopped Stopped NORM: 1k S/s NORM: 100M S/s 1997 / 08 / 04 14:19:52 1997 / 08 / 04 11:23:12 Filter Filter 1s/div 2us/div DC 10:1 DC 10:1 DC 10:1 DC 10:1...
  • Page 27 XR-A550MD 3 7 63 1515 0 L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 28 XR-A550MD 3 7 63 1515 0 3.5 MD MAIN ASSY MD MAIN ASSY (KUCXJ TYPE : XWZ3177) (DBDXJ TYPE : XWZ3186) L 13942296513 CN1054 CN1904 R4599 MTZJ5.1B u163 (MD) CN1902 (MD) (MD) http://www.xiaoyu163.com...
  • Page 29 XR-A550MD 3 7 63 1515 0 : MD or DECK PB SIGNAL ROUTE (MD) : MD PB SIGNAL ROUTE : MD REC SIGNAL ROUTE (PB) : DECK PB SIGNAL ROUTE CN4001 L 13942296513 (PB) (MD) (MD) NJM4558MD (PB) NJM4558MD...
  • Page 30 XR-A550MD 3 7 63 1515 0 3.6 MD FRONT, MD LED and MD SUB ASSEMBLIES MD FRONT ASSY (KUCXJ TYPE : XWZ3178) (DBDXJ TYPE : XWZ3187) MD FRONT ASSY S4501 : MD EJECT L 13942296513 S4502 : DELETE S4503 : MENU...
  • Page 31 XR-A550MD 3 7 63 1515 0 CN41 2SC2412K L 13942296513 MD SUB ASSY (KUCXJ TYPE : XWZ3179) (DBDXJ TYPE : XWZ3188) CAUTION : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE. REPLACE ONLY WITH SAME TYPE NO. 4911.25 MFD, BY LITTELFUSE INK.
  • Page 32 XR-A550MD 3 7 63 1515 0 3.7 AF ASSY (1/3) (REC) (REC) AF ASSY (KUCXJ TYPE : XWZ3172) (PB) (PB) (DBDXJ TYPE : XWZ3181) (REC) (REC) L 13942296513 (REC) (PB) (PB) (PB) (PB) (PB) : DECK PB SIGNAL ROUTE...
  • Page 33 XR-A550MD 3 7 63 1515 0 BA4558F-HT (PB) (PB) (PB) (PB) (PB) (PB) (REC) (REC) (REC) (REC) (REC) (REC) L 13942296513 MS DETECT u163 http://www.xiaoyu163.com...
  • Page 34 XR-A550MD 3 7 63 1515 0 3.8 AF ASSY (2/3) CN8004 CN4102 (CD) (TA) (TA) (TA) LC75394 L 13942296513 u163 CN5501 http://www.xiaoyu163.com...
  • Page 35 XR-A550MD 3 7 63 1515 0 CN6201 : MD or DECK PB SIGNAL ROUTE : PB AUDIO SIGNAL ROUTE (MD) : MD PB SIGNAL ROUTE : MD REC SIGNAL ROUTE (PB) : DECK PB SIGNAL ROUTE (REC) : DECK REC SIGNAL ROUTE...
  • Page 36 XR-A550MD 3 7 63 1515 0 3.9 AF (3/3) and SECONDARY ASSEMBLIES : PB AUDIO SIGNAL ROUTE D3301,D3302: 1SR139-100 L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 37 XR-A550MD 3 7 63 1515 0 CAUTION : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE. REPLACE ONLY WITH SAME TYPE NO. 4913.15 MFD, BY LITTELFUSE INK. AF ASSY FOR IC41 (AEK7016). CAUTION : FOR CONTINUED PROTECTION AGAINST CAUTION : FOR CONTINUED PROTECTION AGAINST (KUCXJ TYPE : XWZ3172) RISK OF FIRE.
  • Page 38 XR-A550MD 3 7 63 1515 0 3.10 PRIMARY and SUB TRANS ASSEMBLIES DBDXJ TYPE ONLY KUCXJ DBDXJ TYPE TYPE ONLY DBDXJ ONLY FU2, FU3 : AEK1056 (T1.6A) KUCXJ KUCXJ TYPE ONLY L 13942296513 DBDXJ TYPE ONLY CN81 u163 http://www.xiaoyu163.com...
  • Page 39 XR-A550MD 3 7 63 1515 0 PRIMARY ASSY (KUCXJ TYPE : XWZ3175) (DBDXJ TYPE : XWZ3184) L 13942296513 • NOTE FOR FUSE REPLACEMENT FOR CONTINUED PROTECTION AGAINST RISK OF FIRE. CAUTION - REPLACE WITH SAME TYPE AND RATINGS ONLY.
  • Page 40 XR-A550MD 3 7 63 1515 0 3.11 DISPLAY ASSY S5920 : TUNING – 4 (1) S5911 : DISPLAY S5929 : TAPE S5942 : MD S5921 : TUNING + ¢ (¡) S5912 : TIMER S5930 : TUNER/BAND S5951 : VOLUME...
  • Page 41 XR-A550MD 3 7 63 1515 0 CN4505 CN5102 L 13942296513 KUCXJ TYPE ONLY D5562,D5564,D5566-D5568 1SS181 u163 D5551-D5554 1SS181 http://www.xiaoyu163.com...

  • Page 42: Pcb Connection Diagram

    XR-A550MD 3 7 63 1515 0 4. PCB CONNECTION DIAGRAM NOTE FOR PCB DIAGRAMS : 1. Part numbers in PCB diagrams match those in the schematic 3. The parts mounted on this PCB include all necessary parts for diagrams.
  • Page 43 XR-A550MD 3 7 63 1515 0 4.2 FM/AM TUNER MODULE CN3051 FM/AM TUNER MODULE VR6201 Q6204 Q6203 L 13942296513 FM/AM TUNER MODULE Q6201 Q6202 IC6201 Q6301 Q6303 Q6302 Q6304 Q6401 IC6202 Q6403 Q6214 Q6306 u163 Q6402 Q6404 Q6205 (ANP7159-B)
  • Page 44 XR-A550MD 3 7 63 1515 0 4.3 CD, MOTOR and SW ASSEMBLIES SW ASSY MOTOR LOADING ASSY MOTOR $M SERVO MECHANISM ASSY Q8101 PICKUP L 13942296513 ASSY Q8254 SIDE A Q8252 Q8251 Q8253 u163 CN1052 (ANP7144-E) CD ASSY B C D...
  • Page 45 XR-A550MD 3 7 63 1515 0 SW ASSY MOTOR ASSY L 13942296513 IC8201 IC8101 IC8301 u163 SIDE B (ANP7144-E) CD ASSY B C D http://www.xiaoyu163.com...
  • Page 46 XR-A550MD 3 7 63 1515 0 4.4 PWB-A PWB-A (MD MAIN ASSY) CN4002 Magnetic Head MD Flexible Board Q1251 CN1902 CN1252 Q1820 Q1820 C1251 Q1252 C1252 R1251 Q1253 R1827 R1939 Q1254 R1463 R1459 Q1253 Q1254 C1425 Q1822 R1461 Q1821...
  • Page 47 XR-A550MD 3 7 63 1515 0 PWB-A CN4101 (MD MAIN ASSY) TP1518 TP1516 TP1504 JC121 R1947 TP1522 TP1520 TP1519 TP1524 TP1908 TP1502 JC170 TP1512 TP1503 TP1517 TP1252 TP1907 TP1501 R1805 JC196 Q1807 Q1807 TP1523 TP1521 TP1905 IC1801 TP1801 Q1801...
  • Page 48 XR-A550MD 3 7 63 1515 0 4.5 MD MAIN, MD FRONT and MD LED ASSEMBLIES MD LED MD FRONT ASSY ASSY (XNP3018-B) (XNP3018-B) CN5502 MD MAIN ASSY L 13942296513 CN4001 CN3001 CN3002 CN1904 (XNP3018-B) SIDE A u163 CN1054 CN1902 G H I http://www.xiaoyu163.com...
  • Page 49 XR-A550MD 3 7 63 1515 0 MD LED MD FRONT ASSY ASSY (XNP3018-B) (XNP3018-B) MD MAIN ASSY L 13942296513 (XNP3018-B) Q4205 Q4206 Q4202 Q4204 u163 Q4501 IC4502 IC4201 IC4202 Q4201 Q4203 IC4503 IC4101 Q4207 SIDE B Q4210 IC4203 Q4209...
  • Page 50 XR-A550MD 3 7 63 1515 0 4.6 MD SUB ASSY MD SUB ASSY CN41 SIDE A CN4504 (XNP3018-B) L 13942296513 IC4003 Q4001 IC4002 Q4002 Q4005 – Q4009 MD SUB ASSY SIDE B u163 (XNP3018-B) Q4003 IC4001 Q4004 http://www.xiaoyu163.com...
  • Page 51 XR-A550MD 3 7 63 1515 0 4.7 SECONDARY ASSY SECONDARY ASSY J4001 IC41 IC71 IC31 POWER TRANSFORMER IC12 SIDE A IC11 L 13942296513 (XNP3019-B) SECONDARY ASSY SIDE B u163 (XNP3019-B) http://www.xiaoyu163.com...
  • Page 52 XR-A550MD 3 7 63 1515 0 4.8 AF ASSY CN4201 CN6201 AF ASSY L 13942296513 DC FAN MOTOR SIDE A u163 VR2302 VR2802 Q3652 Q3654 IC3651 Q2803 Q2804 Q2801 IC42 Q3352 Q3351 IC32 IC51 http://www.xiaoyu163.com...
  • Page 53 XR-A550MD 3 7 63 1515 0 CN4201 CN4102 CN8004 CN5501 L 13942296513 ERASE HEAD HEAD (XNP3019-B) u163 VR2302 VR2301 VR2303 VR2305 VR2802 VR2801 VR2304 VR2306 IC2301 IC3301 Q3351 IC3302 http://www.xiaoyu163.com...
  • Page 54 XR-A550MD 3 7 63 1515 0 AF ASSY L 13942296513 SIDE B (XNP3019-B) IC5891 IC2101 u163 IC5892 Q2301 Q2204 Q2203 Q2802 Q2306 Q2105 Q3603 Q2302 IC2201 Q3605 – Q3608 Q3314 Q3313 Q3312 Q3311 Q3601 IC3001 http://www.xiaoyu163.com...
  • Page 55 XR-A550MD 3 7 63 1515 0 L 13942296513 IC2101 Q2102 Q2201 Q2202 Q5751 Q5752 u163 Q2103 IC5751 IC5691 IC3001 Q2204 Q2203 Q2104 Q3653 Q3651 Q2805 – Q2807 IC2201 Q3312 Q3311 Q3353 Q3354 Q3351 Q3352 IC42 IC51 IC32 http://www.xiaoyu163.com...
  • Page 56 XR-A550MD 3 7 63 1515 0 4.9 PRIMARY and SUB TRANS ASSEMBLIES PRIMARY ASSY (XNP3020-B) T1 POWER TRANSFORMER L 13942296513 CN81 SUB TRANS ASSY (XNP3020-B) AC IN u163 IC82 IC81 SIDE A http://www.xiaoyu163.com...
  • Page 57 XR-A550MD 3 7 63 1515 0 PRIMARY ASSY (XNP3020-B) L 13942296513 SUB TRANS ASSY (XNP3020-B) u163 SIDE B http://www.xiaoyu163.com...
  • Page 58 XR-A550MD 3 7 63 1515 0 4.10 DISPLAY ASSY DISPLAY ASSY CN4505 L 13942296513 SIDE A u163 http://www.xiaoyu163.com...
  • Page 59 XR-A550MD 3 7 63 1515 0 DECK MECHA CN5102 L 13942296513 (XNP3020-B) u163 http://www.xiaoyu163.com...
  • Page 60 XR-A550MD 3 7 63 1515 0 DISPLAY ASSY L 13942296513 Q2903 Q2908 IC5501 Q2901 Q2907 Q5605 Q2910 SIDE B u163 http://www.xiaoyu163.com...
  • Page 61 XR-A550MD 3 7 63 1515 0 L 13942296513 (XNP3020-B) IC5501 Q5502 Q5501 Q5601 – Q5604 Q5503 Q5801 Q5821 Q5606 Q2910 IC3901 u163 http://www.xiaoyu163.com...

  • Page 62: Pcb Parts List

    XR-A550MD 3 7 63 1515 0 Mark No. Description Part No. Mark No. Description Part No. 5. PCB PARTS LIST • Parts marked by "NSP" and can not be supplied. NOTES: • mark found on some component parts indicates the importance of the safety factor of the part.
  • Page 63 XR-A550MD 3 7 63 1515 0 Mark No. Description Part No. Mark No. Description Part No. CAPACITORS CD ASSY C6208 CCSQCH100D50 C6212,C6274,C6275,C6408 CCSQCH101J50 SEMICONDUCTORS C6412 CCSQCH102J50 IC8201 BA5923FP C6221,C6222,C6416 CCSQCH150J50 IC8101 LA9241ML C6271 CCSQCH200J50 IC8301 LC78622NE Q8101 2SA1048 C6415...
  • Page 64 XR-A550MD 3 7 63 1515 0 Mark No. Description Part No. Mark No. Description Part No. C1254,C1610,C1803,C1806,C1991 1245900038 MOTOR ASSY C1101,C1255,C1601,C1602 1245900039 C1605,C1661,C1802 1245940005 SWITCH C1715 1245940006 C1106,C1110,C1953 1245950016 S8503 ASG7009 C1102,C1105,C1109,C1990 1245950017 OTHERS C1807 1265940014 J8502 JUMPER WIRE 4P...
  • Page 65 XR-A550MD 3 7 63 1515 0 Mark No. Description Part No. Mark No. Description Part No. R1106,R1261,R1262,R1263,R1266 1305810909 PWB-B R1405,R1414,R1416,R1422,R1423 1305810909 R1424,R1429,R1430,R1459,R1461 1305810909 (MD MECHANISM SWITCH ASSY) R1463,R1471,R1478,R1650,R1652 1305810909 R1662,R1664,R1965 1305810909 SWITCHES S1954,S1955 1245300026 R1408,R1412,R1473,R1651,R1653 1305810910 S1952 1245300027 R1712...
  • Page 66 XR-A550MD 3 7 63 1515 0 Mark No. Description Part No. Mark No. Description Part No. RESISTORS MD SUB ASSY R4599 RD1/4PU330J Although XWZ3179 and XWZ3188 are different in part number, R4552,R4553 RD1/4PU3R3J Other Resistors RS1/10S they consit of the same components.
  • Page 67 XR-A550MD 3 7 63 1515 0 Mark No. Description Part No. Mark No. Description Part No. IC3001 LC75394NED C3303,C3304 CEAT101M50 IC42 NJM7805FA C2312,C2313,C32,C42 CEAT1R0M50 IC32 NJM7812FA C3653 CEAT220M35 IC3301 STK407-050B C2106,C2214,C2215,C2321,C2322 CEAT220M50 Q3354,Q3601,Q3621 2SA1037K CEAT220M50 2SA1837 C2001,C3601 CEAT221M16 Q2806...
  • Page 68 XR-A550MD 3 7 63 1515 0 Mark No. Description Part No. Mark No. Description Part No. OTHERS SUB TRANS ASSY CABLE HOLDER (15P) 51063-1505 CN1052 22P FFC CONNECTOR 52045-2245 (1) CONTRAST TABLE CN5102 38P FFC CONNECTOR 52045-3845 XWZ3176 and XWZ3185 are constructed the same except...
  • Page 69 XR-A550MD 3 7 63 1515 0 Mark No. Description Part No. Mark No. Description Part No. Q5606 DTC124EK Q2901,Q2907,Q5502,Q5601-Q5603 DTC143EK Q5605,Q5821 DTC143EK D5631,D5811 1SS133 D5551-D5554,D5562,D5564 1SS181 D5566-D5568 1SS181 D2901,D2903,D5569,D5570,D5597 1SS355 D5626,D5901 1SS355 D5602,D5617-D5620 SLP3118C51H D5601 SLP7118C51H D5603,D5604,D5621 SLP9118C51H COIL...

  • Page 70: Adjustment

    XR-A550MD 3 7 63 1515 0 6. ADJUSTMENT 6.1 TUNER SECTION FM Tuner Section • Set the mode selector to FM BAND. • Connect the wiring as shown in Fig. 1. ± d ( µ ) V v i t y t i 1 ±...

  • Page 71: Cassette Deck Section

    XR-A550MD 3 7 63 1515 0 6.2 CASSETTE DECK SECTION • Adjustment points and test points are shown in Fig.3, Fig.5 and Fig.7. Mechanical Adjustment • Test tape: NCT-111 (3kHz, 30min). 1. Tape Speed Adjustment ± r i f &...
  • Page 72 XR-A550MD 3 7 63 1515 0 0 dB 0 dB: 315 Hz, 250 nwb/m 10s ......................10s 315Hz –20 dB 12.5 10kHz 8kHz 6.3kHz 10kHz 315Hz 14kHz 4kHz 2kHz 1kHz 63Hz 40Hz Fig.4 STD-331E Test Tape Playback Adjustment (1) Head Azimuth Adjustment •...
  • Page 73 XR-A550MD 3 7 63 1515 0 (2) Recording Bias Adjustment • Since this adjustment affects recording bias, prevent distortion from increasing due to underbias. – l i t → ± . s l Note : Set the 10kHz input signal level to the same value as the 315Hz input signal level of step 1.
  • Page 74 XR-A550MD 3 7 63 1515 0 6.3 CD SECTION TEST MODE NOTE: There is no information to be shown in this CD adjustment. How to Start/Cancel Test Mode TEST MODE : ON TEST DISC: YEDS-7 CD TEST Short Point...

  • Page 75: Test Mode

    XR-A550MD 3 7 63 1515 0 6.4 MD SECTION 6.4.1 Test Mode 1 Test Mode Types Entering Test Mode Application the Test Mode TEST 1 TEST 1 short CA Check TEST 2 TEST 2 short For MD Mechanism Adjustment...
  • Page 76 XR-A550MD 3 7 63 1515 0 6.4.2 Test Mode 2 6.4.2.1 Preparations Test Disc Type Test Disc Code Part Number High refective disc TGYS1 (SONY)[for playback] 124 636 0001 TGYS1 Low refective disc Recording minidisc 124 957 0001 GGF1277...
  • Page 77 XR-A550MD 3 7 63 1515 0 Microcomputer Version Display (1 sec) (1 second when EJECT is completed.) [ t s m ? ? ? ? e ? ? ] EEPROM protect data version (from 01) Microcomputer ROM version (from 01) Model code When this is displayed, it is called "Test Mode Stop status."...
  • Page 78 XR-A550MD 3 7 63 1515 0 Key Allocation for Test Mode 2 Mode Meaning and use of commands in Test Mode 2 Remarks Short Used when engaging Test Mode. (Test Mode setting) Resets and starts the MD unit and inputs this command.
  • Page 79 XR-A550MD 3 7 63 1515 0 1. AUTO Preliminary Adjustment Mode (Low-Reflectance Disc Only) Step No. Setting Method Remarks Display Step 1 Test mode STOP state [ tsm????e?? ] Step 2 Press the MENU button once. AUTO Preliminary Adjustment Menu [ _AUT_YOBI_ ] ∗∗∗...
  • Page 80 XR-A550MD 3 7 63 1515 0 3. RESULT Preliminary Mode Step No. Setting Method Remarks Display [ SFG: _ _ _¶ ¶ ¶ ] Step 12 Press the MENU button. Set value display [ HAO: ???_ _ _ ] Step 13 Press the MENU button.
  • Page 81 XR-A550MD 3 7 63 1515 0 5. MANUAL Preliminary Adjustment Mode (Low-Reflectance Disc only) Step No. Setting Method Remarks Display Step 1 Test mode STOP state [ tsm????e?? ] Step 2 Press the MENU button 5 times. MANUAL Preliminary Adjustment Menu...
  • Page 82 XR-A550MD 3 7 63 1515 0 6. MANUAL Adjustment Mode High-Reflectance Disc Step No. Setting Method Remarks Display Step 1 Test mode STOP state [ tsm????e?? ] Step 2 Press the MENU button 6 times. MANUAL Adjustment Menu [ _MNU_ AJST_ ]...
  • Page 83 XR-A550MD 3 7 63 1515 0 (a) Focus Setting Step No. Setting Method Remarks Display ♦♦ Step 10 Press the MENU button. LPF coefficient measurement (normal) during FOK formation [ FOKLPFn_ ♦♦ Step 11 Press the MENU button. LPF coefficient measurement (when Focus ON) during FOK formation [ FOKLPFf_ ♦♦...
  • Page 84 XR-A550MD 3 7 63 1515 0 (c) Tracking Setting Step No. Setting Method Remarks Display ♦♦ Step 9 Press the MENU button. Tracking deceleration pulse level setting (for 1 jump) [ TRBLVo_ _ ♦♦ Step 10 Press the MENU button.
  • Page 85 XR-A550MD 3 7 63 1515 0 (e) TEMP Setting Step No. Setting Method Remarks Display Step 1 Test mode STOP state [ tsm????e?? ] Step 2 Press the MENU button 7 times. EEPROM Setting Menu [ EEPROM_ SET] Step 3 Press the button.
  • Page 86 XR-A550MD 3 7 63 1515 0 (e) CONTROL Setting Step No. Setting Method Remarks Display ♦♦ Step 14 Press the MENU button. Equalizer coefficient B, C (low reflectance groove) setting [ GDEQBC_ ♦♦ Step 15 Press the MENU button.
  • Page 87 XR-A550MD 3 7 63 1515 0 Each time the DELETE button is pressed in Continuous Play Mode, the display will change as follows: Continuous playback (SUBQ address display + C1 error display) is unchanged. [ s &&&& c ???? ] Pit part: [ a &&&&...
  • Page 88 XR-A550MD 3 7 63 1515 0 11. EJECT Mode Step No. Setting Method Remarks Display Step 1 Test Mode EJECT status [ _ _ EJECT_ _ _ ] Step 2 Press the DELETE button. Maximum power output status [ xpw_ _ _ _ _ _ _ ] Step 3 Press the DELETE button.
  • Page 89 XR-A550MD 3 7 63 1515 0 6.4.2.3 Mechanism Adjustment 1. Detecting the Optical Pickup Grating Spindle Motor IC1101 Pin 42 Oscilloscope GND (TP1131) 100kΩ IC1101 Pin 26 EOUT (TP1133) 470p CH1 CH2 470p IC1101 Pin 25 FOUT (TP1132) Resurge waveform 100kΩ...
  • Page 90 XR-A550MD 3 7 63 1515 0 6.4.2.4 EEPROM (IC1402) Writing Procedure EEPROM Content Table Control Settings Focus Settings 1. Procedure for replacing EEPROM and writing microcomputer initial settings to EEPROM Item display Set value Item display Set value C O N T R L 1 ?? (1) Replace EEPROM.
  • Page 91 XR-A550MD 3 7 63 1515 0 EEPROM Setting Mode Transition Diagram t s m ???? e?? Test Mode STOP status MENU ×7 E E P R O M_S E T EEPROM Setting Menu EJECT status _ _E J E C T _ _ _ _ _F o c u s _ _ _ MENU×3...

  • Page 92: General Information

    XR-A550MD 3 7 63 1515 0 7. GENERAL INFORMATION 7.1 PARTS 7.1.1 IC • The information shown in the list is basic information and may not correspond exactly to that shown in the schematic diagrams. PDG244A (MD MAIN ASSY : IC4502) •...
  • Page 93 XR-A550MD 3 7 63 1515 0 PDC055A (DISPLAY ASSY : IC5501) • System Control Microcomputer • Pin Function Pin Name Function Pin Name Function − CD RESET Reset output for CD LSI 51 VFDP CD CE Strobe output for CD LSI...

  • Page 94: Display

    XR-A550MD 3 7 63 1515 0 7.1.2 DISPLAY 7 XAV3007 (DISPLAY ASSY : V5621) • FL Display • Pin Assignment • Grid Assignment L 13942296513 (10G) (14G) (2G to 9G) • Pin Connection Pin No. Connection F2 Pin No.
  • Page 95 XR-A550MD 3 7 63 1515 0 • Anode Connection 2G 3G to 6G 10G 11G 13G 14G B10 R10 B11 R11 B12 R12 – – – – – L 13942296513 – – – – – – – – –...

  • Page 96: Diagnosis

    XR-A550MD 3 7 63 1515 0 7.2 DIAGNOSIS 7.2.1 DISASSEMBLY $M MECHANISM CD Bonnet Case × 2 × 2 × 2 × 2 × 2 Tray Cap L 13942296513 Main Cam × 3 Note: The loading tray can be pulled out Unhook when the main cam is in this position.
  • Page 97 XR-A550MD 3 7 63 1515 0 FRONT PANEL Unhook Unhook FM/AM TUNER MODULE AF Assy Front Panel L 13942296513 DISPLAY Assy SUB TRANS Assy MD MAIN Assy PRIMARY Assy SECONDARY Assy MD SUB Assy $M MECHANISM CD ADDITIONAL TO JOB...
  • Page 98 XR-A550MD 3 7 63 1515 0 Clamper Holder Servo Base Servo Mechanism Assy Hook Clamper Holder Hook Servo Base Hook $M Mechanism CD Actuater Actuater L 13942296513 Hook FITTING THE PULLEY INTO THE CARRIAGE MOTOR For replacement of the carriage motor,...
  • Page 99 XR-A550MD 3 7 63 1515 0 MD MECHANISM ASSY DECK AF ASSY MECHA Front Panel × 2 CN4503 CN4505 × 2 MD Mechanism Assy MD MAIN ASSY L 13942296513 Top Cover MD SUB ASSY × 2 MD MAIN ASSY Refer to "MD MECHANISM...
  • Page 100 XR-A550MD 3 7 63 1515 0 (A1) ×1 MD MECHANISM SECTION φ1.7×5mm Removing the Magnetic Head (Fig.1) Magnetic Head (1) Remove a Screw (A1). CAUTION: Take adequate caution not to damage the Magnetic Head during reinstallation. MD Mechanism Assy Fig.1...
  • Page 101 XR-A550MD 3 7 63 1515 0 (D1) × 2 (D1) × 2 Removing the Slide and Loading Motors (Fig.4) φ1.7 × 2mm φ1.7 × 2mm (1) Remove the four Screws (D1) to remove the Slide and Loading Motors. CAUTION: Be careful not to damage the Gears. (Damaged Gears may cause abnormal noise during searching.)

  • Page 102: Details Of Error Display

    XR-A550MD 3 7 63 1515 0 7.2.2 DETAILS OF ERROR DISPLAY Error Display Details of Error Measure ÷ DEFECT occurred 10 times continuously during REC-PLAY. ÷ Check if there are scratches, dusts, fingerprints, or black Can't REC ÷ Recordable cluster became 0 since DEFECT occurred during spots on disc.
  • Page 103 XR-A550MD 3 7 63 1515 0 Error Display Details of Error Measure ÷ TOC read was incorrect or could not be read properly. ÷ The TOC data recorded on the disc do not comply with UNKNOWN DISC MD Standards, so try using another disc.

  • Page 104: Troubleshooting

    XR-A550MD 3 7 63 1515 0 7.2.3 TROUBLESHOOTING ¶ MD does not Operate MD may not operate if the objective lens of the Light Pickup is soiled. Clean the objective lens, then check playback operation. If the symptom still persists, check the points according to the flowchart below.
  • Page 105 XR-A550MD 3 7 63 1515 0 ¶ Disc loading is incorrect Is disc loaded when it is inserted? Check CN1601 and SW1956. Is Pin 4 of CN1601 set to "L"? Does either Pin 23 or 24 of IC1601 change? Check IC1401.
  • Page 106 XR-A550MD 3 7 63 1515 0 ¶ Normal playback It is confirmed that EEPROM value is correct in Test mode: Does the system perform initialization correctly when Does indication of playback time advance? playing back high-reflection disc? Check IC1201.
  • Page 107 XR-A550MD 3 7 63 1515 0 ¶ Recording/playback operations Insert a low-reflection disc to confirm audio output during playback in Normal mode, then set the system to Recording/Playback Test mode. The system does not record from the starting address.
  • Page 108 XR-A550MD 3 7 63 1515 0 ¶ The disc motor does not rotate Do waveforms appear for Pins 24 and 25 of IC1201 at Check soldering and parts of Pins 24 and 25 of IC1201 the focus gain rough adjustment step in Test mode? and the circuits around IC1201.

  • Page 109: Block Diagram

    XR-A550MD 3 7 63 1515 0 7.3 BLOCK DIAGRAM MD SECTION L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 110 XR-A550MD 3 7 63 1515 0 MAIN SECTION DUMMY TUNER IC3001 ZOOM BASS MODULE SURROUND BLASTER LC75394NED (-2dB) FUNCTION $ MECH (-8dB) (200mV) (-8dB) TONE BUSS (3 BAND) MIX AMP MECHA (+2dB) (-6dB) IC4203 NJM4558 TAPE DECK L 13942296513...
  • Page 111 XR-A550MD 3 7 63 1515 0 IC3301 POWER AMP FRONT TOTAL GAIN +29dB MAIN VOL. STK407-050B (+42dB) HEAD PHONE CN3901 L 13942296513 MD REC AMP MECHA IC4201,IC4202 NJM4558MD TAPE IC2301 IC2201 DECK REC IN TAPE DECK HA12136AF VR2301 HA12211NT...

  • Page 112: Panel Facilities And Specifications

    XR-A550MD 3 7 63 1515 0 8. PANEL FACILITIES AND SPECIFICATIONS 8.1 PANEL FACILITIES STEREO CD MD CASSETTE DECK RECEIVER XR-A550MD FREQ/ ON/OFF STATION ASES TAPE REC/STOP REC/STOP DISP EJECT /CHARA MENU DELETE STEREO CASSETTE DECK REC/PLAY FULL LOGIC AUTO REVERSE...
  • Page 113 XR-A550MD 3 7 63 1515 0 Display section 1 Indicates Audio level. 2 Indicates CD operation status. 3 Lights when BEAT CUT 2 is selected. 4 Indicates tape transport direction. 5 Displays timer function indications. 6 Lights when the selected function is CD.

  • Page 114: Remote Control Unit

    XR-A550MD 3 7 63 1515 0 Function button section REMOTE CONTROL UNIT DISC MD DISPLAY CD function button TUNER/BAND function button TAPE function button MD function button AUX function button VOLUME 5 (up), ∞ (down) buttons TUNING [1,4 (–), (+) ¢,¡] buttons...

  • Page 115: Specifications

    With 9 kHz step .......... 531 kHz to 1,602 kHz you an electrical shock. Check the power cord once in a while. Antenna input ............. Loop antenna When you find it damaged, ask your nearest PIONEER authorized CD section service center or your dealer for a replacement.

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