Sony CDX-4250-RV Service manual

CDX-4250RV

3. PRINTED WIRING BOARDS — CD MECHANISM SECTION —

• Semiconductor
Location

Ref. No. Location
IC1 D-2

IC2 E-5
IC3 B-2

Q1 F-5
Q2 F-6

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22

4. SCHEMATIC DIAGRAM — CD MECHANISM SECTION — • Refer to page 1 for Waveforms.

CDX-4250RV

Note:

• Voltage and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD PLAY

: Impossible to measure

∗

((Page

6))

33

CDX-4250RV

5. PRINTED WIRING BOARD — MAIN SECTION —

• Semiconductor
Location (side A)

Ref. No. Location
D403 B-3

D603 G-2
D881 H-4
D909 D-10
D914 B-9
D918 J-9
D919 K-9
D920 B-9
D930 C-9
D940 D-10

IC401 F-6
IC601 F-3
IC602 I-3
IC603 G-3
IC801 J-7

Q110 B-4
Q111 B-4
Q210 C-4
Q211 C-5
Q615 F-5
Q618 J-1
Q905 C-10
Q906 H-5
Q907 I-12
Q908 I-12
Q913 G-13
Q914 K-9
Q915 K-9
Q916 C-9
Q917 C-10
Q918 C-10
Q919 G-13
Q924 D-12
Q925 D-11
Q940 D-11

44

CDX-4250RV

• Semiconductor Location (side B)

Ref. No. Location Ref. No. Location
D402 C-3

D404 D-8
D405 D-8
D406 C-7
D407 D-8
D408 C-8
D409 C-8
D410 C-8
D411 C-8
D601 F-5
D604 E-5
D702 F-12
D807 B-13
D823 A-14
D824 A-14
D856 K-13
D857 K-12
D858 J-12
D859 J-12
D860 J-11
D861 J-10
D862 K-12
D863 K-11
D864 K-10
D865 K-10
D870 I-7
D901 E-12
D902 D-12
D903 D-13
D904 E-13
D910 H-5
D912 H-13
D913 H-12

D915 G-12
D916 I-13
D924 E-13

IC200 A-8
IC702 F-11
IC901 F-13
IC902 J-6

JW29 E-8
Q101 H-3

Q201 H-3
Q401 B-3
Q402 C-3
Q603 G-4
Q604 I-4
Q605 I-4
Q609 G-5
Q610 F-5
Q612 F-5
Q613 F-4
Q614 G-3
Q804 I-7
Q901 I-13
Q902 J-12
Q903 I-13
Q904 G-13
Q909 I-12
Q910 H-13
Q911 H-12
Q912 H-13

((Page 10))

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55