Arcam-DivaCD73-cd-sm维修电路原理图.pdf

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1、DiVA Service Manual CD73 Compact Disc player Issue 1.0 ARCAMARCAM Bringing music the main difference is that the mechanism control circuitry is now incorporated within the main circuit board design of the CD player. Power supply and Power supply control. The mains power supply enters the player via

2、the IEC socket at location SK501 and is filtered by Y Caps C501 C502 and X Cap C503, resistor R501 sits between the Neutral and Positive a.c supply rails. L501 and L502 filter electromagnetic noise and reduce stray E.M.F. SW501 A/B is used to switch the primary feed to the transformer at location TX

3、501, capacitors C504 and C505 help to prolong the life expectancy of the mains switch by reducing contact sparks. The transformer at location TX501 has multiple windings and allows for operation from 115v or a 230v mains supply, the mains select switch at location SW502 connects the duel primaries i

4、n series or parallel depending on the supply requirements. For 100v operation remove J504 and J503 and fit J502 and J501. Please note: The Primary of the transformer is internally fused at 117 degrees C. Fig 1. Power supply identification and related components. Power supply name Associated componen

5、ts AC1 AC2 On/Off mute circuit. +11V(U) D.C DAC card Option at SK203. +8V D.C U102 (tray control) U202 (laser optic spindle motor). Relay RLY501 analogue supply switch. -30VF Filament display grid. F1 F2 Filament A.C supply. +12V(A) Audio output op-amps U403, U404, U405 and DAC card option at SK203.

6、 - 12V(A) Audio output op-amps U403, U404, U405 and DAC card option at SK203. +5V(A)=(DAC) DAC at location U401 and DAC card option at location SK203. +5V(D) Digital control devices U101, U301, U402, U406, U407, U701 and DAC card option at SK203. +3.6V(D) DSP at location U201, Focus/Tracking and sle

7、dge control at location U101. We will now breakdown the power supplies down individually, please refer to Fig 1 for information on key components driven by the individual power supply section. Digital Power supplies AC1 AC2 are used to drive the Audio mute and fast power down control of the Audio ou

8、tput relay at location RLY 401, Diodes D518 and D519 rectify the A.C and the following R C network and transistor switch stage Q501 Q505 allowing for the delayed switch on (+ 4 secs) and instant power down of the Audio output relay the control line is seen as RLYPWR on the circuit diagram and should

9、 measure +10v D.C at Jumper PL402. The +11V(U) supply rail is protected by fuse FS501 and will only be used directly when an additional DAC card is added; we use this supply rail within the CD73 to derive the +8V using U502 and reservoir capacitor C513, the +8V supply feeds the Tray control and Lase

10、r optic drive packages at location U102 and U202. The -30VF D.C is derived from the regulator at location U503 we should see -44V D.C at the input pin of this device. The power supply forms the VFD grid on the Display and is current limited by resistor package R722 (47k ohms). F1 and F2 provide a 1.

11、5V AC to drive the filament. The +11v(U) rail is used to drive the +5(D) power supply, the supply is regulated by the LM317 at location U502 and drives the master clock circuit built around U402 and the SPDIF circuit at location U407 we also power IR in stage and Display micro (U701) from this suppl

12、y. The +5V(D) rail is further regulated to provide the +3.6V(D) rail using the LM317 at location U507; this rail is used to power the DSP at location U201 and the R.F processor at location U101. Please note: U507 has been changed to a LM1086 low dropout regulator, Arcam part number 5D1086A. Please n

13、ote: The above power supplies remain operational when the CD player is switched to standby mode from remote control RadioFans.CN 收音机爱 好者资料库 Analogue power supplies Standby control The Analogue audio supply is under relay control and has over-current protection on both + and phases, this is provided

14、by FS503 and FS504 the output sides of these fuses drive into bridge rectifier BR502, this bridge rectifier package intern supplies the unregulated +/- 18v D.C rails (these are used to drive an optional DAC board). The +/- 18v unregulated D.C rails are regulated by U504 (+) and U505 (-) and provide

15、the +/- 12V(A) supplies. We use the unregulated +18v to create the clean +5(A) supply using regulator U506, this supply is fed to the DAC card option socket at location SK203 but within the CD73 this supply becomes known as the +5(DAC) on the audio stage circuit diagram and is used to power the DAC

16、chip only. The Relay at location RLY501 switches the low voltage A.C from the secondary to the bridge rectifier at location BR502 we will also see that relay RLY502 switches the F1 and F2 rails to the display filament, both if these relays are switched on/off by the control line seen as STANDBY on t

17、he circuit diagrams. When in the on state we should see -4.8V D.C with respect to DGND on the Base of Q309. Clock generation. The clock circuit is based around the 16.9344MHz crystal at location X401 the clock from the crystal is amplified by transistor Q403 before being dived into two separate cloc

18、k streams by the 74HCUO4 buffer at location U402a/b/c/d, the output of U402c is fed to the DAC (U401) and the output of U402d forms the master clock for the DSP at location U201. The third clock within the circuit (4MHz) can be found at location X701A and is used to drive the Display Control Keyboar

19、d scan chip U701. Fig 2. Laser diode direct monitor points Mechanism and Micro engine. Three chips have direct control over the Mechanism their locations and primary functions follow. U201 CXD3017Q DSP o 16k onboard RAM error correction o Sub Q error data error detection o CPU interface U701 display

20、 board o CD text demodulator o Auto gain for Servo loop o Focus bias adjustment o CPU interface o Direct interface to DAC U101 CXA2581N o RF AC-DC summing o Focus error amplifier o Tracking error amplifier o Centre error amplifier U202 BA6392FP o 4 channel BTL driver o Direct turntable motor control

21、 (CH 4) o Focus coil drive +/- (CH2) o Focus coil drive +/- (CH3) o Laser sledge drive (CH1) We can simplify the circuit if we look at the signal path from the Laser optic this can be seen as laser optic output amplifier U101 DSP control micro U201 Laser tracking, Focus, Spindle, Sled control BTL U2

22、02. The CXA2581N at location U101 is fed 6 lines of R.F output from the laser optic these can be seen as inputs A F on pins 6 11, the inputs on pins 10 and 11 are labelled E and F these are used the internal tracking error summing this signal is then seen as a VC output on pin 27. We can directly mo

23、nitor the R.F output from the Laser Photo diodes at location shown in Fig 2. These can be seen as the focus outputs on resistors R103 and R104 these appear above the letters e and f on the diagram, between the two resistors the Laser diode outputs can be seen on the solder feed thru points labelled

24、as a, b, c, d. The laser current can be measured a voltage drop across R101 this should directly relate to the Laser current as set by Sony and printed label on the side of the optical block, this will be seen as- KS213C 18x21 dS489 The line of text at the bottom of the label that reads dS489 indica

25、tes that this laser optic was set to 48.9mV and will read as a measurement across R101 as 489mV +/- 5% (the tolerance of R101 itself). We can observe the operation of the Focus control circuit on Pin 16 of M102 (FCS), with no disc loaded, open and close the tray the player will now search for a disc

26、, at this time we should se a 170 kHz saw tooth that saw tooth should transverse through the 0V DIGGND as the Focus coils moves the Laser lens up and down. The R.F going in on pins 6 9 feed the internal R.F summing amplifier, we can then see the combined R.F output as RFDC on jumper link R222. The s

27、ignal at this point should look very similar to the diagram in Fig 3 when the scope is set to .2uS/Div we should see roughly 400mV pk-pk. Fig 3. H.F eye pattern Please note: The R.F output will obviously differ from disc to disc use the Phillips SBC 444 playability disc if possible. We can see the F

28、E error output signal on R107, this will appear as a high frequency R.F stream of 200mV pk-pk any excessive bounce or noise on the R.F may indicate a damaged or worn/borderline optic. The focus is correct when (A+D) (B+C)= 0 The tracking error (TE) signal can be seen as a high frequency R.F stream o

29、n R218 we should expect to see 150-200mV pk-pk, under tracking error conditions the R.F will rise up 300-600mV pk-pk dependent on the severity of the error. The tracking error is derived as E - F = 0 when correct. The RFDC, RFAC, EF, TE, SE are now fed into U201. The CXD3017Q micro at location U201

30、performs the majority of the Data processing and control tasks within the CD player, the micro receives the RFDC, RFAC for processing along with the EF, TE, SE flags these signals are fed into the micros A/D converter and into the Servo DSP and the PWM modulator from this point the mechanism control

31、 signals leave the micro and travel to the BTL driver at location U202 as SFDR, SRDR, TFDR, TRDR, SFDR, SFD PWM lines, the turntable motor control line leaves the micro as MDP and is filtered and referenced to VC to form a single SPDR line. The presence of the +3.6V(D) power supply is crucial to the

32、 operation of the micros internal PLL. The micro initiates a programmed Disc load procedure when the Disc tray is operated i.e. the tray is closed. Do not look directly into the beam. o Tray Close o Spin turntable motor o Light laser o Attempt focal alignment o Read TOC o If the player fails to read

33、 the disc check. o Movement of Laser lenses. o +5V (D) supply. o +3.6V (D) supply. o +8V supply. o Operation of the tray micro switches. o Laser current. o Focus control. The micro contains a CPU interface; this port sends and receives Data packages from the front panel CPU at location U701. The act

34、ive communication ports can be seen as inputs from the CPU on DATA, XLAT, CLOK, SYSM and XRST the output ports are SQSO (CD text), SENS and SCOR. We should see active data streams on SENS, DATA and SQCK and all times when a disc is playing. The CPU is located at component position U701 and can be fo

35、und on the front panel display board, the CPU contains a Keyboard scan this is driven from the resistive array powered by the VREF output at Pin 98 the voltage drop sensed can be seen on Pin 97 (AVSS) and as 4.9 V on R701. The CPU also receives and decodes the IR from both the display board remote r

36、eceiver and the rear panel remote input 3.5mm jack. Please note: The IR from the from the display panel pickup device is not driven directly into the CPU it takes a path onto the main board and into the IR micro circuit the signal is mixed into the rear panel sourced IR signal by the circuit based a

37、round Q301, Q302, Q303 the result is a signal called RMIN this signal is fed back to the display board and into Pin 32 of the CPU. IR RC5 electrical signals driven into the rear panel 3.5 mm jack passed thru the Opto-isolator package at location OP301 the signal is then clamped to 3v9 by Zener diode

38、 D301 before reaching R-C filter network provided by C340, C341 and R304 final drive is supplied by U301(a) and U301(b). Digital to Analogue conversion The BCK, PCMD and LRCK lines from the DSP are buffered by U406 (74HCU04) before arriving at the D to A converter at location U401 (WM8740) these lin

39、es are now labelled as BCLK, ADATA and LRCKIN (left, right clock in). The WMA740 DAC is driven from its own 5 Volt supply, this can be seen on pin 8 as DVDD. The de-emphasis flag arrives from the DSP on pin number 27 (high = on) The master audio clock arrives at pin 5 labelled at DACLK and is suppli

40、ed by the previously mentioned circuit built around U402 (see page 2) The Audio outputs from the DAC can be seen via an x10 probe on R416 and R414 Left channel and R415 and R417 Right channel, these are differential outputs and as such will have +/- offset respectively. The differential Audio output

41、s from the DAC are summed by U403a and U404a before driving into the output Op-amps U403b and U404b, D.C errors are removed by servo Op-amps U405a and U405b providing a D.C coupled output. Optional DAC stage notes As previously mention the main board has been designed to provide a platform for other

42、 players within the Diva range and as such provisions have been made for the addition of optional D to A stages; these can be connected to the flexi foil sockets at locations SK203 and SK301 see Fig 3a/b for relevant pin information for these sockets. When fitting an optional Audio stage we need to

43、adjust the jumper settings on the existing main board information on jumper settings appear within Fig 4. Fig 3a Pin connections for SK203. Pin Number(s) Power supply and function 1 Digital ground 2,6,7,12,13,19,20 Analogue ground 3,4,5 +11v unregulated 9,10,11 +5v Digital supply (DAC) 14,15 +5v Ana

44、logue supply 16,17,18 -12v Analogue supply 21,22,23 +12v Analogue supply Fig 3b Pin connections for SK301. Pin Number(s) Function 1,2,5-9,18- 20,23,26,28,30,32. Analogue ground 17 Emphasis 21 Reset 22 Mute 25 Left/Right clock in (LRCKIN) 27 A DATA 29 B-Clock (BCLK) Fig 4. Option jumper settings. Loc

45、ation CD73 Option PL100 Open Open PL202 Open Short PL203 Short Open PL204 Open Short PL205 Short Open PL300 1/2 Short 1/2 Open PL300 2/3 Open 2/3 Short PL400 Short Open PL401 Short Open PL402 Short Open PL403 Open Short Resources The Test disc mention in the Mechanism and micro engine section of thi

46、s manual is available from Philips at the below address. Philips Consumer Electronics Co-ordination Office Optical and Magnetic Media Systems Building SWA-112 PO Box 80002 5600 JB Eindhoven The Netherlands Fax +31 40 2732113 ? ? ? ? ? ? ? ? ? ? ARCAM - CD73 ? ? ? ? ? ? ? ? ? !?#?$? %? ?%?(%2 ? ? 3?

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