Page 1
CDX-2500R SERVICE MANUAL AEP Model UK Model Model Name Using Similar Mechanism CDX-4270R CD Drive Mechanism Type MG-363X-121 Optical Pick-up Name KSS-521A SPECIFICATIONS CD player section Power amplifier section System Compact disc digital audio Outputs Speaker outputs system (sure seal connectors)
Page 2
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
TABLE OF CONTENTS 1. GENERAL Location of controls ..............4 Getting Started ................. 4 Setting the clock ..............4 CD Player ................4 Radio ..................5 RDS ..................5 Other Functions ............... 6 Connections ................8 2. DISASSEMBLY 2-1. Cover ................. 10 2-2.
2-3. SUB PANEL (1) ASSY 5 claw 6 sub panel (1) assy 1 PTT 2.6x6 4 claw 2 PTT 2.6x6 3 PTT 2.6x6 2-4. CD MECHANISM BLOCK 2 PTT 2.6x6 7 PTT 2.6x6 8 bracket (M/D) 3 PTT 2.6x6 5 CD mechanism block 6 PTT 2.6x6 4 CNP700 1 PTT 2.6x6...
2-5. MAIN BOARD 6 MAIN board 4 ground point screws (PTT 2.6x6) 5 ground point screw (PTT 2.6x6) 3 PTT 2.6x8 2 PTT 2.6x8 1 PTT 2.6x8 2-6. HEAT SINK 4 heat sink 3 PTT 2.6x8 2 PTT 2.6x12 1 PTT 2.6x8...
2-7. CHASSIS (T) SUB ASSY 4 P 2x3 3 P 2x3 5 chassis (T) sub assy 1 Unsolder the lead wires. 2 P 2x3 gray white black 2-8. LEVER ASSY 5 guide (disc) 6 lever (R) assy 3 tension spring (LR) 7 lever (L) assy 1 PS 2x4 2 DISC IN SW board...
2-9. SERVO BOARD 8 PS 2x4 7 PS 2x4 2 CN2 3 Removal the solders. 1 CN3 5 P 2x3 9 SERVO board 4 Removal the solders. 6 loading motor assy 2-10. ROLLER ASSY • When installing, take note of the positions arm (roller) and washers.
2-11. CHASSIS (OP) (O/S) ASSY 7 chassis (OP) (O/S) assy 8 compression spring (FL) 1 tension spring (KF1) 9 compression spring (FL) 2 tension spring (KR1) 5 Fit lever (D) in the direction of the arrow. 6 Turn loading ring in the direction of the arrow.
SECTION 3 ELECTRICAL ADJUSTMENTS TUNER SECTION 0 dB = 1 µV FM Auto Scan/Stop Level Adjustment Setting : D-BASS switch : OFF Cautions during repair SOURCE button : FM When the tuner unit is defective, replace it by a new one because its internal block is difficult to repair.
Page 17
FM Stereo Separation Adjustment FM RDS S-Meter Adjustment Setting : Setting : D-BASS switch : OFF D-BASS switch : OFF SOURCE button : FM SOURCE button : FM FM RF signal FM RF signal generator generator level meter antenna antenna 10 k Ω...
Page 18
MW Auto Scan/Stop Level Adjustment Adjustment Location : tuner unit (TU601) Setting : D-BASS switch : OFF SOURCE t MODE button : MW 30 Ω 15 pF 65 pF AM RF signal generator AM dummy antenna (50 Ω ) TU601 antenna Carrier frequency : 999 kHz terminal...
CD SECTION Focus Gain Adjustment (Coarse adjustment) This adjustment is not required unless the following parts are replaced: • Optical pick-up Note: • 1. CD Block basically constructed to operate without adjustment. Therefore, check each item in order given. Procedure: 2.
Not used. (Connect to ground in this set.) SQ CKO Sub Q read clock output UNI SI SONY BUS system serial interface input (Not used in this set.) UNI SO SONY BUS system serial interface output (Not used in this set.) UNI CK SONY BUS system serial clock input/output (Not used in this set.)
Page 21
Pin No. Pin Name Pin Description Pin No. Pin Name Pin Description AMP ON Power amplifier power control output — Not used. (Open) TXT ON Reset output to CD-TEXT decoder IC. (Not used in this set.) ANT REM ANT REMOTE power control output VOL ATT Electric volume mute control output —...
CDX-2500R 4-3. BLOCK DIAGRAM — TUNER SECTION — ELECTRONIC (Page 22) VOLUME IC401 SECTION OUT FL TUNER UNIT CD L-CH MUTE TU601 Q110 CNJ600 ANT AM (ANTENNA) R 16 R-CH OUT RL 20 ANT FM AM DET 12 SE3L MUTE...
4-5. CIRCUIT BOARDS LOCATION • Waveforms (MODE:PLAY) 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 diagram: • All capacitors are in µF unless otherwise noted. pF: µµF Approx.
CDX-2500R 4-7. SCHEMATIC DIAGRAM — CD MECHANISM SECTION — • Refer to page 25 for Waveforms. • Refer to page 35 for IC Block Diagrams. (Page Note: • Voltage and waveforms are dc with respect to ground under no-signal conditions.
CDX-2500R 4-9. SCHEMATIC DIAGRAM — MAIN SECTION (1/3) — • Refer to page 37 for IC Block Diagrams. Note: (Page 31) (Page 32) • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ) : MW <...
CDX-2500R 4-10. SCHEMATIC DIAGRAM — MAIN SECTION (2/3) — • Refer to page 38 for IC Block Diagrams. (Page 30) Note: • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ) : MW <...
CDX-2500R 4-11. SCHEMATIC DIAGRAM — MAIN SECTION (3/3) — • Refer to page 38 for IC Block Diagrams. (Page 30) (Page 33) Note: • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ) : MW <...
CDX-2500R 4-12. SCHEMATIC DIAGRAM — DISPLAY SECTION — (Page 32) Note: • Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM...
• IC Block Diagrams IC1 CXD2507AQ SERVO AUTO DATA SEQUENCER XRST SENS SUB CODE MUTE PROCESSOR INTERFACE SQCK DIGITAL LOCK SQSO TEST EXCK SBSO FILO SCOR DIGITAL FILI DEMODULATOR WFCK EMPH AVSS CLTV ASYMMETRY AVDD CORRECTOR DIGITAL DOUT INTERFACE BIAS ASYI ERROR FSTT...
Page 36
IC2 CXA1782BQ 27 26 25 LEVEL S MIRR SENS RF IV AMP1 DFCT C.OUT XRST RF IV AMP2 FE BIAS IIL DATA REGISTER INPUT SHIFT REGISTER DATA ADDRESS DECODER OUTPUT DECODER TOG1-3 FS1-4 TG1-2 TM1-7 PS1-4 F IV AMP BAL1-3 FZC COMP E IV AMP TE AMP...
Page 37
IC401 TDA7462D013TR SE3L SE3R MUTE PAUSE PAUSE DETECT FRONT INPUT TREBLE/ OUT FL VOICE BANDPASS LOUDNESS VOLUME FADER SOFT GAIN & BASS CONTROL SE1L CONTROL AUTO MUTE CONTROL CIRCUIT CIRCUIT SE1R ZERO CIRCUIT FRONT OUT FR MD– FADER CDL+ CDL– COMPANDER CDR–...
Page 38
IC601 TDA7427AD1TR LPOUT VDD1 VDD2 LP FM SWITCH CHARGE PHASE 11 BIT PROG LP1/LP2 GND AM PUMP COMP COUNTER LP HC LP AM SWITCH SWITCH SWM/DIR SWM/DIR V REF AM IN SWITCH AM/FM INLOCK 6 BIT PROG PRE COUNTER DETECTOR COUNTER :32/33 FM IN...
SECTION 5 EXPLODED VIEWS NOTE: • The mechanical parts with no reference • Color Indication of Appearance Parts The components identified by number in the exploded views are not supplied. mark 0 or dotted line with mark Example : • Items marked “*” are not stocked since 0 are critical for safety.
5-5. CD MECHANISM SECTION (3) (MG-363X-121) M901 M902 The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark * 201...
SECTION 6 DISC IN SW DISPLAY ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in • Items marked “*” are not stocked since The components identified by mark 0 or dotted line with mark the parts list may be different from the they are seldom required for routine service.