Philips-DVP-721-VR-Service-Manual(1) 电路图 维修手册.pdf

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1、S Se er rv vi ic ce e S Se er rv vi ic ce e Service S Se er rv vi ic ce e S Se er rv vi ic ce e Service S Se er rv vi ic ce e S Se er rv vi ic ce e Service S Se er rv vi ic ce e S Se er rv vi ic ce e Service Service Manual SECTION 1 SUMMARY1-1 PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS 1

2、-2 SERVICING PRECAUTIONS 1-3 SERVICE INFORMATION FOR EEPROM IC SETTING 1-4 SPECIFICATIONS 1-5 SECTION 2 CABINET CONNECT A 1500 OHM 10 WATT RESIS- TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CON- DUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE

3、 AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING

4、 THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY. SUBJECT: GRAPHIC SYMBOLS THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICI

5、ENT MAG- NITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIAN- GLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. SUBJECT : X-RADIATION 1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE

6、 PER- SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN- TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC- TURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERA- TION AT

7、 HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC- TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR- CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR- ABLE LEVELS. 2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN COLOR SETS, AL

8、WAYS RE-INSTALL THEM. 3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA TION OF THE METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE AT YOUR DISTRIBUTOR. 4. WHEN THE HIGH VOLTAGE CIRCUITRY IS O

9、PERATING PROPERLY THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING CORRE

10、CTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGA- NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU- LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE- DURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER ON EACH CUSTOMERS INVOICE. 5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A PROD

11、UCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE, AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT LONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCES SIVE VOLTAGE. 6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES DESCRIBED IN THE APPROPR

12、IATE SCHEMATIC AND DIAGRAMS (WHERE USED). SUBJECT: IMPLOSION 1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT. 2. USE ONLY RECOMMENDED FACTOR

13、Y REPLACEMENT TUBES. SUBJECT : TIPS ON PROPER INSTALLATION 1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY- HOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW. 2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DE

14、W IS A FACTOR, NEAR STEAM RADIA- TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC. 3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC- ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION. 4. WALL AND SHELF MOUNTED INSTALLATIONS USING

15、A COMMER- CIAL MOUNTING KIT. MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PA

16、RTS OR WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS. 5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED. 6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER

17、ON THE HAZ- ARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS. 7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED F

18、OR USE WITH T.V.S OF THE SAME OR LARGER SCREEN SIZE. 8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SIN- GLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY. PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS A.C. VOLTM

19、ETER GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC PLACE THIS PROBE ON EACH EXPOSED METAL PART 1-3 SERVICING PRECAUTIONS CAUTION : Before servicing the VCR+DVD covered by this service data and its supplements and addends, read and fol- low the SAFETY PRECAUTIONS. NOTE : if unforeseen cir- c

20、umstances create conflict between the following servicing precautions and any of the safety precautions in this publi- cations, always follow the safety precautions. Remembers Safety First: General Servicing Precautions 1. Always unplug the VCR+DVD AC power cord from the AC power source before: (1)R

21、emoving or reinstalling any component, circuit board, module, or any other assembly. (2)Disconnection or reconnecting any internal electrical plug or other electrical connection. (3)Connecting a test substitute in parallel with an elec- trolytic capacitor. Caution : A wrong part substitution or inco

22、rrect polarity installation of electrolytic capacitors may result in an explosion hazard. 2. Do not spray chemicals on or near this VCR+DVD or any of its assemblies. 3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to

23、the contacts with a pipe cleaner, cotton-tipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required. 4. Do not defeat any plug/socket B+ voltage interlocks with whitch instruments covered by this service manual might be equipp

24、ed. 5. Do not apply AC power to this VCR+DVD and/or any of its electrical assemblies unless all solid-state device heat sinks are cerrectly installed. 6. Always connect test instrument ground lead to the appropriate ground before connection the test instrument positive lead. Always remove the test i

25、nstrument ground lead last. Insulation Checking Procedure Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of the attachment plug. The insulation resis- tance between each blade of the attachment plug and acces- sible

26、 conductive parts (Note 1) should be more than 1M- ohm. Note 1 : Accessible Conductive Parts including Metal pan- els, Input terminals, Earphone jacks, etc. Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components

27、commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electric

28、ity. 1. Immediately before handling any semiconductor compo- nent or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commer- cially available discharging wrist strap device, which should be removed fo

29、r potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grouned-ti

30、p soldering iron to solder or unsolder ES devices. 4. Use only an anti-static solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices. 5. Do not use freon-propelled chemicals. These can generate electrical char

31、ge sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protec tive package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conducti

32、ve material). 7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. Caution : Be sure no power is applied to the chassis or circuit, and observe all o

33、ther safety precautions. 8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static elec- tricity sufficient to damage an ES device.)

34、1-4 SERVICE INFORMATION FOR EEPROM IC SETTING MODELNAMEHEXBINARY DVP721VR/00OPT1FC00000000 OPT2C300000000 OPT35B00000000 OPT40100000000 OPT50000000000 DVP721VR/02OPT1FC00000000 OPT2D600000000 OPT37B00000000 OPT40000000000 OPT50000000000 DVP721VR/05OPT1FE00000000 OPT2CD00000000 OPT34B00000000 OPT4020

35、0000000 OPT50000000000 DVP721VR/14OPT1BC00000000 OPT2DD00000000 OPT35B00000000 OPT40400000000 OPT50000000000 WR : OK I : EXIT MOVE : F G EDIT : DE 1. DETECT NEW EEPROM (OPTION EDIT SCREEN) - Eeprom EDIT screen automatically appears if replacing Eeprom. - Setup option data using the cursor Up/Down ke

36、y of a remote control. (Setup upon BOM depending on OPT1OPT5 model) Since an initial remote control is set to LG for LG model, appropriately set optiona data using the cursor Up/Down key. 2. EEPROM WRITED COMPLETE SCREEN - Writes data on EEPROM by using REMOCON OK. - If completing the option data sc

37、reen with a menu key, Powering Off is automatically done and the option edit screen is arranged. 3. PG ADJUST 1) Payback the SP standard tape 2) Press the “1” key on the Remote controller and the “PLAY” key on the Front Panel the same time, then it goes in to Tracking initial mode. 3) Repeat the abo

38、ve step(No.2), then it finishes the PG adjusting automatically. 4) Stop the playback, then it goes out to PG adjusting mode after mony the PG data. 4. EEPROM INITIAL - SETUP is displayed in the field if pressing the FRONT REC KEY with the remocon number CLEAR key pressed in the status of powering Of

39、f. - AUTO SEARCH is done since the initial screen of ACMS is serviced if powering On. - Check basic operation (PLAY/RECORD.) EEPROM option code No. settingEEPROM option code No. setting procedure NAMEHEXBINARY OPT10000000000 OPT20000000000 OPT30000000000 OPT40000000000 OPT50000000000 WR : OK I : EXI

40、T MOVE : F G EDIT : DE MASKROM : R00 EEPROM : R01 LG CODE 1-5 SPECIFICATIONS General Power requirements AC 220-230V, 50Hz Power consumption 19W Dimensions (approx.) 430 X 78.5 X 265 mm (w/h/d) Mass (approx.) 4.06 kg Operating temperature 5C to 35C (41F to 95F) Operating humidity 5 % to 90 % Timer 24

41、 hours display type RF Modulator UHF 22-68 (Adjustable) System Laser Semiconductor laser, wavelength 650 nm Video Head system Double azimuth 6 heads, helical scanning. Signal system PAL Frequency response DVD (PCM 96 kHz): 8 Hz to 44 kHz DVD (PCM 48 kHz): 8 Hz to 22 kHz CD: 8 Hz to 20 kHz Signal-to-

42、noise ratio More than 100dB (ANALOG OUT connectors only) Harmonic distortion Less than 0.008% Dynamic range More than 100 dB (DVD) More than 95 dB (CD) INPUTS (VCR) Audio -6.0dBm, more than 10 kohms (SCART) -6.0dBm, more than 47 kohms (RCA) Video 1.0 Vp-p, 75 ohms, unbalanced (SCART/RCA) OUTPUTS (DV

43、D) VIDEO OUT1 Vp-p 75 ohms, sync. negative S-VIDEO OUT(Y) 1 Vp-p 75 ohms, negative sync., Mini Din 4-pin x 1 (C) 0.3 Vp-p 75 ohms COMPONENT VIDEO OUT(Y) 1 Vp-p 75 ohms, negative sync., RCA jack x 1 (Progressive Scan) (Pb)/(Pr) 0.7 Vp-p 75 ohms, RCA jack x 2 RGB output 0.7 Vp-p 75 ohms Audio output (

44、digital audio) 0.5 V (p-p), 75 ohms, RCA jack x 1 Audio output (optical audio) 3 V (p-p), 75 ohms, Optical connector x 1 Audio output (analog audio) 2.0 Vrms (1 kHz, 0 dB), 600 ohms, RCA jack (L, R) x 2/SCART (TO TV) OUTPUTS (VCR) Audio -6.0dBm, less than 1 kohms (SCART) Video 1.0Vp-p, 75 ohms, unba

45、lanced (SCART) RGB output 0.7 Vp-p 75 ohms *Design and specifications are subject to change without notice. 2-1 SECTION 2 CABINET SW 30Hz PAL:SW 25Hz Head switching output point RF Envelope output point Play the standard test tape. 6. X- distance Adjustment Left X- distance Adjusting Hole Tilt Adjus

46、ting Screw (C) Fixing Screw Height Adjusting Screw (B) Right Grove of Base A/C Purpose of adjustment : To maintain compatibility with other VCR (VCP). RF ENVELOPE OUTPUT POINT HEAD RF SWITCHING OUTPUT POINT OSCILLOSCOPE Connection Diagram CH- 2CH- 1 Azimuth Adjustment Screw(A) Checking/Adjustment Pr

47、ocedure 1) Play the blank tape (empty tape) and check whether the guide roller crumbles or wrinkles the tape and adjust it if necessary. 2) Check that the RF envelope output waveform is flat, and adjust the height of the guide roller while playing the standard test tape. 3) Adjust the switching poin

48、t. 4) Check the RF envelope output is the maximum when the tracking control locates at the center. If not maxi- mum, set up to ensure that RF envelope output becomes the maximum by turning the (+) type driver ( 3 4) on the base A/C groove. 4- 18 DECK MECHANISM ADJUSTMENT 8- 2. Check of Tape Curl and

49、 Jam Status Fixtures and tools usedConnection positionVCR (VCP) statusAdjustment position Oscilloscope Standard test tape (only for SP) Post Height Adjusting Driver Driver (+) Type 5 CH-1: PB RF Envelope CH-2: NTSC : SW 30Hz PAL:SW 25Hz Head switching output point RF Envelope output point Play the blank tape. Play the standard test tape. Fine adjustment of guide roller Switching Point Tracking Preset X-distance 7. Adjustment after Drum Assembly (Video Heads) Purpose of adjustment : To adjust and stabilize the height change, X- distance change, etc dependin