Classe-CP47.5-pre-sm维修电路原理图.pdf

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1、CP-47.5 Class PREAMPLIFIER SERVICE MANUAL v 1.0 RadioFans.CN 收音机爱 好者资料库 Index Mechanical Assembly3 PC Boards17 Testing Procedures30 Diagrams33 RadioFans.CN 收音机爱 好者资料库 CP-47.5 MECHANICAL ASSEMBLY 1 MS-2347 PHILIPS 2 L1A2XR01 3 L1A3XR02 CP-47.5 FACE PLATE ASSEMBLY Class - 1 MODEL CP-47.5MODEL CP-47.5

2、STANDBYSTANDBYSELECTORSELECTOR TAPETAPEMUTEMUTE 3 1 2 FACE PLATE ASSEMBLY 1 2 3 4 5 L214XR01-S 6 Class - 2 CP-47.5 1 2 3 6 5 4 TOP VIEW SIDE VIEW 1 SIDE VIEW 2 CHASSIS REAR VIEW 1 2 3 4 5 6 7 8 8 7 5 6 1 2 Class - 3 3 4 CP-47.5 CHASSIS REAR VIEW 1 2 3 Class - 3 CP-47.5 1 2 3 CHASSIS 1 PLA CAPFR1 2 H

3、DW #8 FLAT WASHER 3 BZO 8-32x3/4” BHCS 4 L1A1XR03 Class - 6 1 2 3 CP-47.5 4 TOP VIEW Class - 8 PARTIAL ASSY 1 AVR BO51XR02 2 AVR BO50XR03 3 AVR BO1CXR00 4 TRANSFORMER CP-47.5 TOP VIEW Class - 8 PHONO BOARD INSTALLATION 1 2 CP-47.5 SIDE VIEW 1 2 SHIPPING AREA - FINAL ASSY 1 L1A5XR00 2 Class - 9 CP-47

4、.5 MODEL CP-47.5MODEL CP-47.5 STANDBYSTANDBYSELECTORSELECTOR TAPETAPEMUTEMUTE 2 1 CP-47.5 PC BOARDS B1A1XR04 MAINBOARD Class - 10 CP-47.5 B1A2XR02 FRONT PCB Class - 11 CP-47.5 B1A3XR01 DISPLAY Class - 11 CP-47.5 B0F9XR02 PHONO Class - 11 CP-47.5 CP-47.5 TESTING PROCEDURES Class - 14 START - UP 1-che

5、ck 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 7-Connect speaker cables, regular and balanced inputs 8-Apply 10V AC from variable transforme

6、r and check the rail and driver voltages 9-If the unit is OK increase the voltage up to 120V 10-Turn off the unit and remove by pass 11-Turn on the unit and check the rails driver and offset 12-Check the sequence of relay clicking 13-Adjust the bias and offset 14-Check the protection circuit both ch

7、annels 15-Check the signal with 8 and 4 load in 16-Regular, regular mono, balanced stereo and balanced mono 17-Check noise with small speaker and RCA shorted plug 18-Put in burning bench CP-47.5 CP-47.5 FINAL TEST Class - 15 1. Before final test unit was 4 days on burn-in-bench with music. 2. Take t

8、he 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. -check any missing parts. -check all fuse sockets. -check main board tight

9、up with screw and washer. -check any screw missing. -check balance lock working smoothly. -check all output transistors position with pad. -check main transistors position with pad. -check main transformer tight very well. 4. Adjust bias 26mV for every output devices for both channels. Wait 7 to 8 m

10、inutes after each adjustment. Also adjust offset to 0mV. 5. Measure rail and pre-driver voltage. 6. Measure A.C voltage for bridge. 7. Measure supply voltage for relays. +15V and 15V for both channels. +12V and 12V. 8. Measure reference voltage 8.1V on both channels. 9. Measure reference voltage for

11、 protection 78V. 10. After setting the bias, connect load and input signal. Check output signal. Check phase with input signal. 11. Measure frequency response, slew rate, gain, signal to noise ratio. 12. Check the output signal from 20Hz to 20KH with load in following combination. Also measure the o

12、utput power. Regegur-stereo Balance-stereo Regegur-mono Balance-mono 13. Check phone-jack. 14. Check protection on both channels. 15. Check noise with speaker. 16. Put the jumpers and varistor for required A.C voltage. 17. Plug unit again and check rail and pre-driver voltage. CP-47.5 DIAGRAMS MAINB

13、OARD SUPPLY - B1A1XR04 (1) Class - 16 CP-47.5 Class - 17 CP-47.5 MAINBOARD INPUT - B1A1XR04 (2) Class - 18 CP-47.5 MAINBOARD VOLUME - B1A1XR04 (3) Class - 19 CP-47.5 MAINBOARD PREAMP (LEFT) - B1A1XR04 (4) Class - 20 CP-47.5 MAINBOARD PREAMP (RIGHT) - B1A1XR04 (5) PANEL - B1A2XR01 (1) Class - 21 CP-4

14、7.5 PANEL - B1A2XR01 (2) Class - 21 CP-47.5 DISPLAY - B1A3XR01 Class - 21 CP-47.5 CP-47.5 to Omega Block Diagram Single-ended Input Selector Balanced InputBalanced Selector Input Input Selector Volume Controls + - + - Pre-out Single-ended To Balanced Conversion Gain Stage CP-47.5 MAIN BOARD (B101 X

15、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. Q112 78T05 C192 +10V C193 + 5V 4.

16、 Q102 7918 C104 -36V C106 -24V C135 -6V 3. Q101 7818 C103 +36V C105 +24V C134 +6V 4. Q103 7818 C115 +24V C117 +18V 5. Q104 7918 C116 -24V C118 -18V 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 10. Q107 7812 C142 +12

17、V C140 +18V 11. Q108 7912 C143 -12V C141 -18V 12. TIP 107 Q403, Q406, Q405, Q503, Q506, C406, C413, C506, C513, -18V 13. TIP 102 Q402, Q405, Q502, Q505, C404, C411, C504, C511, +18V 14. U203,U202, U201, U301,U303 OPA 2134 a) C159, C156, C154, C160, C162 +12V b) C158, C157, C155, C161, C163 -12V 15.

18、U302, U304 CS3310 C305 +5V C311 +5V C304 -5V C310 -5V C303 +5V C309 +5V 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,

19、 R407, R416, R417, R508, R507, R516, R517 20. Offset maximum + or 10MV W/ Respect to GND T.P. lower pins on R409, R418, R509, R518 21. Tape out offset max (+) (-) 10MV 22. Check signals CP47.5 DISPLAY (B1A2 X R02) 1. INSPECTION: a) Visually check all parts for: solder bridges of splashes, backwards

20、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). c) Switch on the unit. d) “Class” will appear on display while green L

21、ED is flashing on DSDBY for 6 seconds and turn to standby mode. e) Press SDBY switch green LED switch off and display appears, relay must click. f) Press selector switches up and down one at a time. Relays click every time you press selector switches. Check display for missing dot (s) g) Press tape

22、switch; relay clicks, red LED is on. h) Press mute, green LED lights, no relay clicking. i) Check volume manually. j) Check remote control if the functions are working. 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. - Re-install the top cover and test unit. R402 R411 R502 R511 FRONT