Classe-CP47_5-pre-sm维修电路原理图.pdf

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1、CP-47.5ClassPREAMPLIFIERSERVICE MANUALv 1.0RadioFans.CN 收音机爱 好者资料库IndexMechanical Assembly3PC Boards17Testing Procedures30Diagrams33RadioFans.CN 收音机爱 好者资料库CP-47.5MECHANICALASSEMBLY1 MS-2347 PHILIPS2 L1A2XR013 L1A3XR02CP-47.5FACE PLATE ASSEMBLYClass - 1MODEL CP-47.5MODEL CP-47.5STANDBYSTANDBYSELECTOR

2、SELECTOR TAPETAPEMUTEMUTE312FACE PLATE ASSEMBLY1 2 3 4 5 L214XR01-S6 Class - 2CP-47.5123654TOP VIEWSIDE VIEW 1SIDE VIEW 2CHASSIS REAR VIEW1 2 3 4 5 6 7 8 8 7 5 612Class - 334CP-47.5CHASSIS REAR VIEW1 2 3 Class - 3CP-47.5123CHASSIS1 PLA CAPFR12 HDW #8 FLAT WASHER3 BZO 8-32x3/4” BHCS4 L1A1XR03Class -

3、6123CP-47.54TOP VIEWClass - 8PARTIAL ASSY1 AVR BO51XR022 AVR BO50XR033 AVR BO1CXR004 TRANSFORMERCP-47.5TOP VIEWClass - 8PHONO BOARD INSTALLATION1 2 CP-47.5SIDE VIEW12SHIPPING AREA - FINAL ASSY1 L1A5XR002 Class - 9CP-47.5MODEL CP-47.5MODEL CP-47.5STANDBYSTANDBYSELECTORSELECTOR TAPETAPEMUTEMUTE21CP-47

4、.5PC BOARDSB1A1XR04 MAINBOARDClass - 10CP-47.5B1A2XR02 FRONT PCBClass - 11CP-47.5B1A3XR01 DISPLAYClass - 11CP-47.5B0F9XR02 PHONOClass - 11CP-47.5CP-47.5TESTINGPROCEDURESClass - 14START - UP1-check all wires and components2-Check screws and bolts3-Connect the jumpers for 120 Volts4-Turn the bias all

5、the way to 0 volts5-Connect the unit in bypass mode6-Connect the unit with variable transformer7-Connect speaker cables, regular and balanced inputs8-Apply 10V AC from variable transformer and check the rail and driver voltages9-If the unit is OK increase the voltage up to 120V10-Turn off the unit a

6、nd remove by pass11-Turn on the unit and check the rails driver and offset12-Check the sequence of relay clicking13-Adjust the bias and offset14-Check the protection circuit both channels15-Check the signal with 8 and 4 load in16-Regular, regular mono, balanced stereo and balanced mono17-Check noise

7、 with small speaker and RCA shorted plug18-Put in burning benchCP-47.5CP-47.5FINAL TESTClass - 151. 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.-c

8、heck 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 up with screw and washer.-check any screw missing.-check balance lock working smoothly.-check all output transistors position with pad.

9、-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 minutes after each adjustment. Also adjust offset to 0mV.5. Measure rail and pre-driver voltage.6. Measure A.C voltage for bridge.7. Measure s

10、upply 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 protection 78V.10. After setting the bias, connect load and input signal. Check output signal. Check phase with input signal.11. Measure frequenc

11、y 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 output power.Regegur-stereoBalance-stereoRegegur-monoBalance-mono13. Check phone-jack.14. Check protection on both channels.15. Check noise with speak

12、er.16. Put the jumpers and varistor for required A.C voltage.17. Plug unit again and check rail and pre-driver voltage.CP-47.5DIAGRAMSMAINBOARD SUPPLY - B1A1XR04 (1)Class - 16CP-47.5Class - 17CP-47.5MAINBOARD INPUT - B1A1XR04 (2)Class - 18CP-47.5MAINBOARD VOLUME - B1A1XR04 (3)Class - 19CP-47.5MAINBO

13、ARD PREAMP (LEFT) - B1A1XR04 (4)Class - 20CP-47.5MAINBOARD PREAMP (RIGHT) - B1A1XR04 (5)PANEL - B1A2XR01 (1)Class - 21CP-47.5PANEL - B1A2XR01 (2)Class - 21CP-47.5DISPLAY - B1A3XR01Class - 21CP-47.5CP-47.5 to Omega Block DiagramSingle-ended InputSelectorBalanced InputBalancedSelectorInputInputSelecto

14、rVolumeControls+-+-Pre-outSingle-endedTo BalancedConversionGain StageCP-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)

15、Apply 60 VAC and check voltages C) Apply full blast 120 VAC 3. Q112 78T05 C192 +10V C193 + 5V 4. 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

16、C128 -15V 8. Q110 7905 C167 -5V C169 -12V 9. Q109 7805 C168 +5V C166 +12V 10. Q107 7812 C142 +12V 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, U

17、301,U303 OPA 2134 a) C159, C156, C154, C160, C162 +12V b) C158, C157, C155, C161, C163 -12V 15. 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 capacitor

18、s: 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. 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 (B1

19、A2 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 a

20、nd standby, red on tape). c) Switch on the unit. d) “Class” will appear on display while green LED 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. Relay

21、s click every time you press selector switches. Check display for missing dot (s) g) Press tape 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)

22、- 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