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
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