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Classe Audio CP-47.5 Service Manual
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Classe Audio CP-47.5 Service Manual

Classe Audio CP-47.5 Service Manual

V 1.0
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Classé
CP-47.5
PREAMPLIFIER
SERVICE MANUAL
v 1.0

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Summary of Contents for Classe Audio CP-47.5

  • Page 1 Classé CP-47.5 PREAMPLIFIER SERVICE MANUAL v 1.0...
  • Page 2 Index Mechanical Assembly PC Boards Testing Procedures Diagrams...

  • Page 3: Mechanical Assembly

    CP-47.5 MECHANICAL ASSEMBLY...
  • Page 4 FACE PLATE ASSEMBLY CP-47.5 < < 1 MS-2347 PHILIPS 2 L1A2XR01 3 L1A3XR02 Classé - 1...

  • Page 5: Top View

    FACE PLATE ASSEMBLY CP-47.5 TOP VIEW SIDE VIEW 2 SIDE VIEW 1 5 L214XR01-S Classé - 2...
  • Page 6 CHASSIS REAR VIEW CP-47.5 Classé - 3...
  • Page 7 CHASSIS REAR VIEW CP-47.5 Classé - 3...
  • Page 8 CHASSIS CP-47.5 TOP VIEW 1 PLA CAPFR1 2 HDW #8 FLAT WASHER 3 BZO 8-32x3/4” BHCS 4 L1A1XR03 Classé - 6...
  • Page 9 PARTIAL ASSY CP-47.5 TOP VIEW 1 AVR BO51XR02 2 AVR BO50XR03 3 AVR BO1CXR00 4 TRANSFORMER Classé - 8...
  • Page 10 PHONO BOARD INSTALLATION CP-47.5 SIDE VIEW Classé - 8...
  • Page 11 SHIPPING AREA - FINAL ASSY CP-47.5 < < 7 .5 7 .5 1 L1A5XR00 Classé - 9...
  • Page 12 CP-47.5 PC BOARDS...
  • Page 13 B1A1XR04 MAINBOARD CP-47.5 Classé - 10...
  • Page 14 B1A2XR02 FRONT PCB CP-47.5 Classé - 11...
  • Page 15 B1A3XR01 DISPLAY CP-47.5 Classé - 11...
  • Page 16 B0F9XR02 PHONO CP-47.5 Classé - 11...

  • Page 17: Testing Procedures

    CP-47.5 TESTING PROCEDURES...
  • Page 18 START - UP CP-47.5 1-check all wires and components 2-Check screws and bolts 3-Connect the jumpers for 120 Volts 4-Turn the bias all the way to 0 volts 5-Connect the unit in bypass mode 6-Connect the unit with variable transformer...

  • Page 19: Final Test

    FINAL TEST CP-47.5 1. Before final test unit was 4 days on burn-in-bench with music. 2. Take the unit from burn-in-bench to Q.C and play it immediately. Keep the line 120V A.C. 3. Check physically and check the components. -check all capacitor and devices direction. Capacitor stand up right way i.e. check co- solder.
  • Page 20 CP-47.5 DIAGRAMS...
  • Page 21 MAINBOARD SUPPLY - B1A1XR04 (1) CP-47.5 Classé - 16...
  • Page 22 MAINBOARD INPUT - B1A1XR04 (2) CP-47.5 Classé - 17...
  • Page 23 MAINBOARD VOLUME - B1A1XR04 (3) CP-47.5 Classé - 18...
  • Page 24 MAINBOARD PREAMP (LEFT) - B1A1XR04 (4) CP-47.5 Classé - 19...
  • Page 25 MAINBOARD PREAMP (RIGHT) - B1A1XR04 (5) CP-47.5 Classé - 20...
  • Page 26 PANEL - B1A2XR01 (1) CP-47.5 Classé - 21...
  • Page 27 PANEL - B1A2XR01 (2) CP-47.5 Classé - 21...
  • Page 28 DISPLAY - B1A3XR01 CP-47.5 Classé - 21...
  • Page 29 CP-47.5 to Omega Block Diagram Single-ended Input Single-ended Selector Balanced Conversion Pre-out Volume Gain Stage Controls Balanced Input Balanced Input Selector Selector Input...
  • Page 30 CP-47.5 MAIN BOARD (B101 X R03) 1. INSPECTION A) Visually check all parts for: solder bridges or splashes, backwards or missing components and component orientation. 2. POWER SUPPLY VOLTAGES A) Apply 30 VAC and check polarities B) Apply 60 VAC and check voltages C) Apply full blast 120 VAC 3.
  • Page 31 6. Q105 → 7815 C125 → +18V C127 → -15V 7. Q106 → 7915 C126 → +18V C128 → -15V 8. Q110 → 7905 C167 → -5V C169 → -12V 9. Q109→ 7805 C168 → +5V C166 → +12V Q107→ 7812 C142 →...
  • Page 32 16. 1C101 → OPA2134 C415 → +15V C417 → -15V 17. U501→ OPA2134 C515 → +15V C517 → -15V 18. Q401, Q404, Q501, Q504 → TL431 Measure across capacitors: C403, C410, C503, C510 → 2.5V 19. BIAS voltages→ 150MV to 200 MV Measure across resistors: R408, R407, R416, R417, R508, R507, R516, R517 20.
  • Page 33 CP47.5 DISPLAY (B1A2 X R02) 1. INSPECTION: a) Visually check all parts for: solder bridges of splashes, backwards or missing components, and component orientation. b) Q1, Q2 1R receivers must be raised to 1/8”. 2. FUNCTIONS: a) Install microchip-CP475R06 on U1 and DRV08R10 on U10. b) Install all LEDs (green on mute and standby, red on tape).
  • Page 34 Model CP-47.5 Gain Reduction (9dB) - Unplug the CP-47.5 completely from the AC line. - Remove the top cover - Un-solder resistors R402, R411, R502, and R511 from the main PCB (picture below). Original value is RN60D2152. - Replace these resistors with this new value: RN60D3012.