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Sony STR-DB725 Service Manual

Fm stereo/fm-am receiver
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Download this manual See also: Service Manual
STR-DB725/DB825
SERVICE MANUAL
AEP Model
UK Model
Photo: STR-DB825
SPECIFICATIONS
— Continued on next page —
FM STEREO/FM-AM RECEIVER
MICROFILM
– 1 –

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Summary of Contents for Sony STR-DB725

  • Page 1 STR-DB725/DB825 SERVICE MANUAL AEP Model UK Model Photo: STR-DB825 SPECIFICATIONS — Continued on next page — FM STEREO/FM-AM RECEIVER MICROFILM – 1 –...
  • Page 2 STR-DB725/DB825 3-3. SCHEMATIC DIAGRAM – VIDEO INPUT SECTION – • See page 43 for IC Block Diagrams. (Page 21) (Page 32) (Page 21) (Page 17) – 13 – – 14 –...
  • Page 3 STR-DB725/DB825 3-5. SCHEMATIC DIAGRAM – INPUT SECTION – • See page 43 for IC Block Diagrams. (Page 22) (Page 21, (Page 22) (Page (Page (Page (Page 32) (Page (Page (Page 33) (Page 31, 32) – 18 – – 17 –...
  • Page 4 STR-DB725/DB825 3-7. SCHEMATIC DIAGRAM – S-VIDEO SECTION – • See page 43 for IC Block Diagrams. (Page 18) (Page 18) (Page 18) (Page 14) (Page 14) – 22 – – 21 –...
  • Page 5 STR-DB725/DB825 3-9. SCHEMATIC DIAGRAM – SPEAKER SECTION – • See page 43 for IC Block Diagrams. (Page 18) (Page 31) (Page 38) (Page 38) (Page 18) (Page 41) (Page 31) (Page 37) (Page 37) – 25 – – 26 –...
  • Page 6 STR-DB725/DB825 3-12. SCHEMATIC DIAGRAM – DISPLAY SECTION – • See page 11 for Waveforms. • See page 46 for IC Pin Function. (Page (Page (Page (Page (Page 14) (Page 17) (Page (Page (Page (Page 17,18) – 31 – – 32 –...
  • Page 7 STR-DB725/DB825 3-13. SCHEMATIC DIAGRAM – FRONT PANEL SECTION – (Page 32) (Page 32) (Page 32) (Page 31) (Page 18) – 34 – – 33 –...
  • Page 8 STR-DB725/DB825 3-15. SCHEMATIC DIAGRAM – POWER AMP SECTION – (Page 25) (Page (Page 25) (Page 41) (Page 17) (Page 41) (Page 25) (Page 26) (Page 31) – 38 – – 37 –...

  • Page 9: Schematic Diagram - Trans Section

    STR-DB725/DB825 3-17. SCHEMATIC DIAGRAM – TRANS SECTION – (Page 38) (Page 38) (Page 26) – 41 –...

  • Page 10: Ic Block Diagrams

    3-19. IC BLOCK DIAGRAMS IC001, 601, 701 uPC2581V BIAS CIRCUIT PROTECTOR DRIVE DRIVE DRIVE DRIVE IC106 BA6208 MOTOR SWITCH DRIVE MOTOR SWITCH DRIVE IC251 NJM2296D Vout2 Vin1 Vout3 Vin2 Vout1 Vin5 Vin4 Vin3 IC302 LC7822 IN IN LEVEL SHIFT LATCH RESET SHIFT RESISTOR –...
  • Page 11 IC400 CXA8081S AGND PDM-COUT SRA1-8K INV-PHASE R+DELAY L+DELAY 5K/7K-L.P.F. VOL/MUTE 20KH-L.P.F. B-NR -6dB RS-TRIM R-STEREO LS-TRIM VREF 17 18 IC401 CXA8079S 47 46 45 44 43 30 29 28 C-TRIM R-B.P.F. L+R-RECT VCS-LOG N-GEN N-BPF BAL-DET L-R-RECT DUAL-TIME CMODE SMUTE N-OH BALCONT R-RECT...
  • Page 12 IC452 BU1922 TEST LOGIC AND OUTPUT SELECTOR SWITCH 57kHz OSCILLATOR ANTI- QUALITY BIT RECONSTRUCTION BANDPASS ALIASING GENERATOR FILTER (8th ORDER) DIVIDER FILTER BIPHASE CONTAS LOOP DEFFERENTIAL CLOCKED SYMBOL VARIABLE AND DECODER COMPARATOR DECODER FIXED DIVIDER CLOCK REGENERATION AND SYNC REFERENCE VOLTAGE IC901 NJM2103D IC502 TC9184P...

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Str-db825