YAMAHA DP-U50 维修电路原理图.pdf

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1、DP-U50 DP-U50 PERSONAL SOUND PROCESSER 100736 I CONTENTS TO SERVICE PERSONNEL . 1 FRONT PANEL . 2 REAR PANELS . 2 SPECIFICATIONS . 3 INTERNAL VIEW . 4 DISASSEMBLY PROCEDURES . 4 SELF DIAGNOSIS FUNCTION.5 13 STANDARD OPERATION CHART . 14 IC DATA .15 24 DISPLAY DATA . 25 BLOCK DIAGRAM .26 27 PRINTED C

2、IRCUIT BOARD .28 35 IC BLOCK .36 37 SCHEMATIC DIAGRAM .38 39 PARTS LIST .40 49 REMOTE CONTROL TRANSMITTER. 50 PARTS LIST FOR CARBON RESISTORS . 51 This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel. It has been assumed that basic service procedures i

3、nherent to the industry, and more specifically YAMAHA Products, are already known and understood by the users, and have therefore not been restated. WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury, destruction of expensive

4、 components, and failure of the product to perform as specified. For these reasons, we advise all YAMAHA product owners that any service required should be performed by an authorized YAMAHA Retailer or the appointed service representative. IMPORTANT:The presentation or sale of this manual to any ind

5、ividual or firm does not constitute authorization, certification or recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form. The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineer

6、ing, and service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributors Service Divi

7、sion. WARNING:Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss). IMPORTANT:Turn the unit OFF during disassembly and part replacement.

8、Recheck all work before you apply power to the unit. IMPORTANT NOTICE DP-U50 SERVICE MANUAL DP-U50 DP-U50 I TO SERVICE PERSONNEL 1. Critical Components Information Components having special characteristics are marked Z and must be replaced with parts having specifications equal to those originally i

9、nstalled. 2. Leakage Current Measurement (For 120V Models Only) When service has been completed, it is imperative to verify that all exposed conductive surfaces are properly insulated from supply circuits. GMeter impedance should be equivalent to 1500 ohm shunted by 0.15F. GLeakage current must not

10、exceed 0.5mA. AC LEAKAGE TESTER OR EQUIVALENT EQUIPMENT UNDER TEST INSULATING TABLE WALL OUTLET 1 WARNING: CHEMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In addition, other electrical/ electronic and/or plastic (where applicable) components may also contain

11、 traces of chemicals found by the California Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm. DO NOT PLACE SOLDER, ELECTRICAL/ ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHATSOEVER! Avoid prolonged, unprotecte

12、d contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux vapor! If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food. GBe sure to test for leakage with the AC plug i

13、n both polarities. “CAUTION” “F1 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 1.0A, 125V FUSE.” CAUTION F1 : REPLACE WITH SAME TYPE 1.0A, 125V FUSE. ATTENTION F1 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 1.0A, 125V. A V DP-U50 DP-U50 2 I FRONT PANEL M U, C mod

14、els I REAR PANELS M A model M B, G models DP-U50 DP-U50 3 I AUDIO SECTION Output Level/Impedance PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0V/2.0k SUB WOOFER (50Hz) . . . . . . . . . . . . . . . . . . . . . .2.0V/1.7k Input Sensitivity/Impedance PC, AUX 1, AUX 2 (Analog) .

15、. . . . . . . . . . . 150mV/35k Maximum Input Signal Level PC, AUX 1, AUX 2, 1kHz (DSP= THRU) . . . . . . . . . 2.1V Headphone Jack Rated Output/Impedance PC Analog Input, etc (1kHz, 150mV) . . . . . . 320mV/61 Frequency Response USB to PRE OUT 20Hz . . . . . . . . . . . . . . . . . . . . . . . . .

16、. . . -1.0+1.0/-1.0dB 1kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0dB 20kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5+1.0/-1.0dB PC, AUX Digital Input to PRE OUT 20Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.0+1.0/-1.0dB 1kHz .

17、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+0/-0dB 20kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5+1.0/-1.0dB Total Harmonic Distortion (1kHz, 20k LPF) USB to PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01% PC, AUX Digital Input to PRE OUT

18、 . . . . . . . . . . . . . 0.01% Signal-to-Noise Ratio (IHF-A-Network) USB to PRE OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . 100dB PC, AUX Digital Input to PRE OUT . . . . . . . . . . . . . 110dB Residual Noise (IHF-A-Network) PRE OUT L/R . . . . . . . . . . . . . . . . . . . . . . .

19、. . . . . . . . 20V I SPECIFICATIONS I GENERAL Power Supply U, C models . . . . . . . . . . . . . . . . . . . . . . . AC 120V, 60Hz A model . . . . . . . . . . . . . . . . . . . . . . . . . . . AC 240V, 50Hz B, G models . . . . . . . . . . . . . . . . . . . . . . . AC 230V, 50Hz Power Consumption .

20、. . . . . . . . . . . . . . . . . . . . . . . . . . . 20W Standby Power Consumption . . . . . . . . . . . . . . . . . . . . . 8W Dimensions (W x H x D) . . . . . . . . . . . . . 120 x 294 x 355mm (4-11/16” x 11-9/16” x 13-15/16”) Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0 kg

21、(11 lbs 3oz) Finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Silver color Accessories . . . . . . . . . . . . Remote Control Transmitter x 1 Battery (size AA, R06) x 2 USB Cable x 1 CD ROM x 1 * Specifications subject to change without notice. Manufactured under license fr

22、om Dolby Laboratories. Dolby, AC-3, Pro Logic, and the double-D symbol V are trademarks of Dolby Laboratories. 1992-1997 Dolby Laboratories. All rights reserved. Manufactured under license from Digital Theater Systems, Inc. US Pat. No. 5,451,942 and other world-wide patents issued and pending. DTS,

23、DTS Digital Surround, are trademarks of Digital Theater Systems, Inc. copyright 1996 Digital Theater Systems, inc. All rights reserved. U . . . . . . . . . . USA model C . . . . . .Canadian model A . . . . . Australian model B . . . . . . . . British model G . . . . . European model G DIMENSIONS Uni

24、ts : mm (inch) 120 (411/16) 85 (35/16) 355 (1315/16) 253 (915/16) 13.5 (1/2) 13 (1/2) 294 (119/16) 281 (111/16) 283 (111/8) DP-U50 DP-U50 4 I INTERNAL VIEW I DISASSEMBLY PROCEDURES (Remove parts in the order as numbered.) 1. Removal of Top Cover Remove 14 screws ( q and w ) and then remove the Top C

25、overs in Fig. 1. qDSP P.C.B. wMAIN P.C.B. eOPERATION (1) P.C.B. rOPERATION (2) P.C.B. rwqe 2. Removal of Front Panel Remove 6 screws ( e ) and then remove the Front Panel in Fig. 2. 3. Checking the DSP P.C.B. Remove 4 screws ( r ) and then remove the Shield Case in Fig. 2. Fig. 2 Fig. 1 w q q q q q

26、q e e r Top Cover (R) r Front Panel Shield Case Top Cover (L) Top Cover The shield case can be removed only by loosening these 2 screws marked (r). DP-U50 DP-U50 5 I SELF DIAGNOSIS FUNCTION This product has a built-in self diagnosis function (DIAG) that can be used for inspection, measurement and de

27、termination of a faulty point, if any. There are ten menu items, each of which has a number of sub menu items. Listed below are these menu items and sub-menu items. Main menu ALL (Sequential test) DEV (Device test) DSP (DSP test) FL (FL test) AD (AD test) USB (USB loop back test) INIT (Memory initia

28、lization) VER (Version information) ERROR (Error history) Sub menu 1. THROUGH 2. DELAY 3. HALL 4. JAZZ 5. CHURCH 6. GAME 7. MOVIE 8. LIVE 9. PC-ANA 10. PC-Digi 11. AUX1-A 12. AUX1-D 13. AUX2-A 14. RETURN 1. AUTO 2. MANUAL 3. RETURN 1. KEY 2. LEVEL 3. JUDGE 4. V-ERR 5. V-MAX 6. V-MID60 7. V-MID55 8.

29、V-MID52 9. V-MID49 10. V-MID29 11. V-MID1 12. V-MIN 13. RETURN 1.START 2. STOP 3. RETURN 1. MEMORY 2. CANCEL 3. RETURN 1. SHV 2. EGAV 3. ChckSum 4. RETURN 1. E0- 2. E1- 3. E2- 4. E3- 5. E4- 6. E5 - 7. E6- 8. E7- 9. CLEAR 10. RETURN No. 1 2 3 4 5 6 7 8 9 Main menu DIT (Digital interface) EXIT Sub men

30、u 1. GENERAL 2. CD 3. PCM Enc 4. DAT 5. BS JPN 6. Synthe 7. AD 8. SD 9. BS Eur 10. MIXER 11. SFC 12. DSP 13. L Pa:Ch 14. DIR RV 15. RETURN No. 10 0 DP-U50 DP-U50 6 G Starting DIAG While the opening message appearing at the power ON is on display, press the “DSP” key 3 times; quickly at the first and

31、 second times and keep pressing it at the third time until the DIAG function is started. G Display when DIAG function is started First, “DIAG” appears on the FL display of the main unit, followed by the version of the microcomputer for 1 second (e.g., 1.000f), the checksum of the microcomputer for 2

32、 seconds (e.g., 7720) and finally the DIAG menu (e.g., 1: ALL). Also, all the function LED segments light up. Version of the microcomputer Checksum of microcomputer D I A G 1 . 0 0 0 f 7 7 2 0 1 :A L L 1 second later 2 seconds later DIAG started (*1) When there is a history of the protection functio

33、n recorded, the type of the last protection function in the record appears. When there is no protection function history (*1) Some seconds later DIAG menu DP-U50 DP-U50 7 When the protection function works and the power is turned off after DIAG was started When the protection function (*2) works, it

34、s history appears in the abbreviated form as described below and the power turns off. Correct the failure based on the history of the protection function. (*2) When some abnormality is detected in the power source, etc. the power is forced to turn off by the protection function. PT PS display (Turni

35、ng on the power without solving the problem causes the protection function to work at that moment and the power turns off. If the trouble is in the power supply related to the display, display may disappear.) Possible cause: An abnormality in the power supply section (voltage) Supplementary informat

36、ion: As the following power supply is detected, the faulty point can be identified. Stabilizing power source 15A, +9V, +5A, +5D SW, -VP Besides the above possible causes, the cause may be disconnection of the connector, an error around CPU, etc. G History of protection When the protection function h

37、as worked, its history is stored in the backup memory. Even if no abnormality is found while servicing, the abnormality the user experienced can be identified by using the data in the backup memory. The recorded history of the protection function is cleared when the DIAG function is cancelled by set

38、ting DIAG menu No.7 INIT to “MEMORY” (memory initialization) or when the backup memory is erased. DP-U50 DP-U50 8 G Canceling DIAG There are two methods to cancel the DIAG function. 1) Press the “POWER” (STANDBY) key of the main unit or the “POWER” (STANDBY) key of the remote controller to enter the

39、 stand-by state. 2) Selecting the DIAG menu item 0. EXIT, cancel the DIAG function. Then the self-diagnosis process ends and the normal operation is restored. CAUTION: Prior to cancellation of the DIAG function, be sure to execute setting of DIAG menu 7. INIT (reserve / reserve cancel of memory init

40、ialization). (To keep the user memory, execute “CANCEL” (cancellation of resetting reservation) of 7. INIT setting before canceling the DIAG function.) G Operation procedure of DIAG menu and SUB-MENU 1) Use the UP w (forward) / DOWN q (reverse) keys to select a main menu item. 2) In case of main men

41、u items 1. ALL and 2. DEV neither of which has sub menu, the menu item is executed when the DSP key is pressed. 3) In case of main menu items which have sub menu, the sub menu appears when the DSP key is pressed. 4) Use the UP w (forward) / DOWN q (reverse) keys to select a sub-menu item. 5) The sub

42、-menu item is executed when the DSP key is pressed. 6) To return from the sub-menu to the main menu, have “RETURN” displayed by using the UP w (forward) / DOWN q (reverse) keys and press the DSP key. 7) To return to the DIAG initial setting (1.ALL) during DIAG operation, press the MUTE key except fo

43、r the special case (*3). (*3) : It is not possible to return to 1.ALL during execution of the AD test. Main unit UP w (forward) DOWN q (reverse) DSP MUTE Remote control key VOLUME UP w (forward) VOLUME DOWN q (reverse) ON/OFF - (operation unavailable) Remote control code 7B-0D 7B-0E 7B-07 - When usi

44、ng remote controller G Functions during DIAG operation Following functions are available even during the DIAG operation. Power ON/OFF Master volume DP-U50 DP-U50 9 Details of DIAG menu Displaybit 7654 00000 10001 Display 0 0 0 0 0 00 0 0 0 bit7 6 5 43 2 1 0 Displaybit 3210 00000 10001 20010 30011 40

45、100 50101 60110 70111 81000 91001 A1010 B1011 C1100 D1101 E1110 F1111 bit7Unused (“0” usually) bit6Unused (“0” usually) bit5Unused (“0” usually) bit4Checks checksum of IC438 (ROM) (0: OK / 1: NG) bit3Checks IC447 (RAM) (0: OK / 1: NG) bit2Checks register Read/Write of IC430 (USS820) (0: OK / 1: NG)

46、bit1Checks register Read/Write of IC417 (YSS928) (0: OK / 1: NG) bit0Checks register Read/Write of IC475 (LC27287B) (0: OK / 1: NG) 1. ALL (Sequential test) This menu is used to execute major five items of the DIAG menu. The items are as follows. (Set the volume level to the intermediate value befor

47、e execution.) Press the DSP key to advance one step to the next item. To skip a step, press the MUTE key. (To end the DIAG function during the AD test of Step 5, keep pressing the DSP key for a long period of time.) 1. Device test (DEVICE) . . . . . . . . . . . . . . . . . . . . . . . . .page 92. DEV 2. DSP test (THROUGH) . . . . . . . . . . . . . . . . . . . . . . . .page 103. DSP 3. DSP te