Philips-CD100_v1_0-cd-sm 电路图 维修手册.pdf

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1、CONTENTS 1. Table of Contents per page 2. Explanation of the Layout of the Documentation 3. Technical Specification 4. Controls 5. Repair Hints 6. Measurements and Settings 7. Exploded Views and Parts Lists of Mechanical Components 8. Block Diagram, Principal Diagrams, Printed Circuit Board Data and

2、 Parts Lists of Electrical Components 9. Wiring Drawings 10. Trouble Shooting Methods 11. Changes 12. Additional Information Safety regulations require that the device be switched on during repairs. It is returned in its original condition and parts identical to those specified are used. English Ver

3、sion CHG 01/2023 v1.0 RadioFans.CN 收音机爱 好者资料库 1. TABLE OF CONTENTS PER PAGE Chapter Page Contents Chapter Page Contents Explanation of the layout of the Documentation Technical Specification Bill Of Materials - Tools Controls Repair Hints Removing the Frame Replacing the Transformer Fuse Servicing t

4、he Mains Input Filter Servicing the Decoding Board Servicing the Servo Board Servicing the Switch and Display Board Replacing the Lid Service of the RAFOC unit Turntable Height Adjustment Checking the Angle Setting Adjusting the Angle Setting Measurement Specification Changing the Transformer Connec

5、tions Adjusting the Offset Control Control of the A.G.C. and Offset circuits Laser Power Control and Adjustment (NEG.VOLT.PH.) Adjusting the Focus Bandwidth Laser Power Control and Adjustment (POS.VOLT.SH.) Exploded view of the Cabinet BOMs Exploded View of the Frame Exploded view of the mechanism/p

6、arts list Mains Filter Circuit Schematic Mains Filter PCB Drawing BOM Block Diagram Power Supply Circuit Schematic Power Supply PCB Drawing BOM Power Supply Circuit Schematic Power Supply PCB Drawing BOM 6V Power Supply Circuit Schematic 6V Power Supply PCB Drawing BOM Power Supply Circuit Schematic

7、 BOM Pre-amplifier Circuit Schematic Pre-amplifier PCB Drawing BOM Pre-amplifier Circuit Schematic Pre-amplifier Circuit Schematic Pre-amplifier PCB Drawing (NEG.VOLT PH.) BOM Pre-amplifier PCB Drawing (POS.VOLT.SH.) BOM Pre-amplifier Circuit Schematic Pre-amplifier PCB Drawing (POS. VOLT. SH.) BOM

8、Control Circuit Schematic Control PCB Drawing BOM Control Circuit Schematic Control PCB Drawing BOM RadioFans.CN 收音机爱 好者资料库 Chapter Page Contents Chapter Page Contents Fault Finding Method Fault Finding Method Fault Finding Method Fault Finding Method Fault Finding Method Fault Finding Method Fault

9、Finding Method Fault Finding Method Fault Finding Method Fault Finding Method Fault Finding Method Fault Finding Method Fault Finding Method Fault Finding Method Fault Finding Method Amendments Amendments Amendments Amendments Amendments Additional Information Wiring Drawing Wiring Drawing List of S

10、tandard Symbols Decoder Circuit Schematic (part 2) Servo Circuit Schematic (part 1) Servo PCB Drawing BOM Servo PCB Drawing BOM Servo Circuit Schematic (part 2) Servo Circuit Schematic (part 1) Servo PCB Drawing Servo PCB Drawing BOM Servo Circuit Schematic (part 2) Decoder Circuit Schematic (part 1

11、) Decoder Circuit Schematic (part 1) Decoder Circuit Schematic (part 2) Decoder Circuit Schematic (part 2) Decoder Circuit Schematic (part 1) Decoder PCB Drawing BOM Decoder PCB Drawing BOM Decoder PCB Drawing BOM Decoder PCB Drawing BOM Decoder PCB Drawing BOM Decoder PCB Drawing BOM RadioFans.CN 收

12、音机爱 好者资料库 System Compact Disc Digital Audio System Channel Separation 86dB Mains Voltages 110V, 127V, 220V, 240V 10% (by changing transformer connections) Channel Difference 0.3dB Mains Frequencies 50, 60Hz (no switching necessary) Total Harmonic Distortion 0.005% (0dB) Power consumption 35W Intermo

13、dulation Distortion 550 mV across resistor 3308) shortens the life of the laser diode. Control The laser simulator board POS.VOLT.SH.3 (4822 395 30229) must be used for this. Remove the flex board from connector A11 and connect the simulator board to the connector. Remove plug A16 and insert it into

14、 the connector on the simulator board. Connect the 4-wire plug to connector A16. Disconnect plug A17 and insert the 1-wire plug into connector A17. Control of the resting state Set the switch on the simulator board to the OFF position and the power switch to the ON position. Turn bias resistor 3180

15、clockwise (max. R) and measure voltage on the simulator between points +V and -V. The voltage measures to be 15 mV. Checking the control of the laser power supply: Set the switch on the simulator board to the ON position and measure the voltages between point +V and -V on the simulator board. Resist

16、ance 3180 clockwise (max. R): U+v to v = -225mV 45mV. Resistance 3180 counterclockwise (min. R): U+v to v = -750mV 150mV. Set resistor 3180 in the middle position. This is a preset. After the simulator PCB has been removed, the laser current must be set. Adjust Play from test CD 4822 397 30096 track

17、 1 (CD without defects). Connect across resistor 3308 to SERVO PCB a DC voltmeter. Use resistor 3180 to adjust the laser power supply so that the voltage across resistor 3308 is 575mV 75mV. Laser power supply (POS.VOLT.SH.) Since the light pen is very sensitive to static charges, when measuring and

18、adjusting the laser power, the tools and yourself must have the same potential as the CD mechanism. PRE-AMP + LASER PCB marked with identification A06 and above Laser power supply (POS.VOLT.SH.) Since the light pen is very sensitive to static charges, when measuring and adjusting the laser power, th

19、e tools and yourself must have the same potential as the CD mechanism. Control The laser simulator board POS.VOLT.SH.2 (4822 395 30215) must be used for this. Remove the flex board from connector A11 and connect the simulator board to the connector. Remove plug A16 and insert it into the connector o

20、n the simulator board. Connect the 4-wire plug to connector A16. Disconnect plug A17 and insert the 1-wire plug into connector A17. In the quiescent state, the current through the laser diode should be 1mA. Control: Set the switch on the simulator board to the OFF position and the power switch to th

21、e ON position. Turn bias resistor 3180 counterclockwise (min. R) and measure voltage across resistor 3194. The voltage measures to be 15 mV. Checking the control of the laser power supply: Set the switch on the simulator board to the ON position and measure the voltages between point +V and -V on th

22、e simulator board. Resistance 3180 clockwise (max. R): U+v to v = 60 mV 30mV. Resistance 3180 counterclockwise (min. R): U+v to v = 560 mV 50mV. Set resistor 3180 in the centre/mid position. This is a preset. After the simulator PCB has been removed, the laser current must be set. Adjust Play from t

23、est CD 4822 397 30096 track 1 (CD without defects). Connect across resistor 3308 to SERVO PCB a DC voltmeter. Use resistor 3180 to adjust the laser power supply so that the voltage across resistor 3308 is 500mV 50mV. Note A laser current that is too high ( 550 mV across resistor 3308) shortens the l

24、ife of the laser diode. TROUBLESHOOTING METHOD When setting up the error-finding method for Compact Disc, it turned out that a different approach than the usual approach was necessary. It is no longer possible to assume the method in which a number of possible faults in the device form the starting

25、point for the fault finding method. A certain error with an associated symptom can have a large number of causes. The reason for this is that a number of closed-loop circuits occur in the Compact Disc, which can also influence each other, making obvious measurements impossible. In the following meth

26、od, the device is schematically divided into nine clearly recognizable subgroups. The defective subgroup can be located more clearly by a few adjustments. After this, the circuit can be metered according to the indicated method. HINTS Test CDs It is important that the test CDs are handled with great

27、 care. The distortions on the CD (black splashes, fingerprints, etc.) are exclusive and are unambiguously positioned. Damage can cause extra drop-outs, etc., making the wanted error on the CD just that little bit more exclusive. Testing the proper functioning of the track detector is then no longer

28、possible. Measurements using op-amps Op-amps are frequently used in the servo circuits. These can be used as amplifiers, fillers, inverters and buffers. In those cases where feedback looping has been applied in some way, the voltage difference at the differential inputs converges to zero. This appli

29、es to both DC and AC signals. The cause of this can be traced back to the properties of an ideal op-amp (Zi = G = Z0 = 0). When an input of an op- amp is connected directly to ground, it is virtually impossible to measure the inverting and non-inverting inputs. In such a case only the output signal

30、is measurable. Therefore, in most cases the AC voltage at the inputs will not be given. The DC voltages at the inputs are equal to each other. Simulate with O and 1 During troubleshooting, certain points must sometimes be connected to ground or to the supply voltage. As a result, certain circuits ca

31、n be brought into a desired state, which shortens the diagnosis time. In some cases, the points in question are op-amp outputs. These outputs are short-circuit proof. i.e., they may be brought to “0” or ground with impunity. However, the output of an op-amp should never be connected directly to the

32、supply voltage. Measurements of microprocessors Microprocessor inputs and outputs must not be connected directly to the power supply ring. The inputs and outputs may only be set to 0 or ground when this is explicitly stated. Selection of the ground potential It is very important to choose a ground p

33、oint as close as possible to the test point. Conditions for Injection Injection of levels or signals from an external source should never be done if the circuit in question has no supply voltage. The projected levels or signalers may never exceed the supply voltage of the relevant circuit. Short bur

34、ning of the laser After removing plug A17 and bridging the lid switch, the laser will continue to burn when the mains voltage is switched on. The focus loop and the radial loop are then also interrupted: at points A171 (FE = Focus Error), A174 (RE1 = Radial Error 1) and A173 (RE2 = Radial Error 2).

35、When the unit is in service loop A, the laser will burn indefinitely, even if there is no CD on the turntable. Irregular operation of the display Erratic display behavior when the device is open and running may be caused by hand effect near the crystal oscillators. Switching the reset switch off and

36、 on cancels this effect. Adherence of the test points In the drawings of the schematics and the printed circuit boards, the test points are indicated with a number (e.g. to which the fault finding method refers. For oscillograms, amplitudes, time bases and position of the device see the list of test

37、 points. GENERAL CHECK POINTS In the following detailed troubleshooting method, a number of general conditions, which are necessary for a well-functioning device, will not be mentioned. Before starting the detailed troubleshooting method, these general points should be checked first. a. Make sure th

38、at the lid is closed or the tilt switch is bridged during measurement. b. Make sure that the CD and objective are clean (dissolved dust, fingerprints, etc.) and work with undamaged CDs. c. Check the presence of the necessary clock frequencies: 4.433619 MHz for decoding P 6 MHz for servo P 4.233600 M

39、Hz for CIM-IC 4.35 MHz for free running PLL circuits on DEMOD IC. d. Check whether all supply voltages are present and have the correct value. e. Check that the two mutes (KILL and NOT(SMSE) are inactive so that the information flow is never interrupted. f. Check the proper functioning of both micro

40、processors by means of their built-in test program and any peripheral test program. Method: Self-test decode P 6506 Take the servo P 6201 out of its socket. From decoder P 6506 connect the points 18 and 21 with 14. When switching on the mains voltage, connect the points 6 and 14 together. If the P w

41、orks properly, point 22 within 1 sec. go from 1 to 0. Self-test servo P 6201 Take the decode P out of its socket. Connect points 18 and 21 with 14 of servo P 6201. When switching on the mains voltage, connect points 6 and 14 together. If the P is functioning properly, measure point 22 within 1 sec.

42、to go from 1 to 0. Peripheral test servo P 6201 1. Place a CD on the turntable and switch off the mains power. Hold down the stop key while the mains voltage is switched on. Release the stop button after 1 sec. The device is now in the so-called service loop A. In this mode, the laser and the focus

43、control are working and the motor is running. The light pen remains against the inner stop (i.e. the light pen remains continuously below the run-in tracks). The radial servo system is disabled. In this service loop, all LEDs and operating keys can be checked as follows: All program LEDs must light

44、up and can go out one by one in a rhythm of 1Hz. When LED no. 15 is off, the process repeats. In the trackbar, only the LED that corresponds to the lowest program LED at that moment lights up. When any of the keys, pause, select, store, cancel, repeat or reverse is pressed, the pause LED and “repeat

45、 LED will cycle from on to off or vice versa. The error LED will also light up. It goes out again when a track LED lights up. 2. The player can be moved from service loop A to service loop B by pressing the FWD key until a whistling sound is heard. Now, independent of the state of the P bit and the

46、subcode (via the bus), the radial servo system is switched on. The display remains in the service loop. 3. The player can be returned to normal operating mode from service loop A or B by pressing the PLAY key. 4. Eye pattern. Check with an oscilloscope the RF signal (called eye pattern) on the outpu

47、t of the preamplifier (measurement point ). Set the time base to 0.5 sec. The oscilloscope should show a fairly stable signal when the PLL circuit is captured and the turntable motors servo circuit is properly regulated. A shaky or jittery picture can be caused by a bad motor or because the device i

48、s in service loop A DETAILED TROUBLESHOOTING METHOD A number of quick and effective checks provide an immediate answer to malfunctioning parts of the device. Two service loops (A and B) are built into P 6201 for short-rolling the servo systems. Before placing the device in service loop, A or B, it must be checked whether the bus (c