Philips-MCD-712-Service-Manual电路原理图.pdf

DVD Home Theater System TABLE OF CONTENTS3141 785 34240XL 09 072008Location of PC Boards . 1-1Electronic Specification . 1-2Measurement Setup . 2-1Service Aids . 2-2Items Of Safety Attention . 2-3 to 2-4Instruction On CD Playability .2-5 to 2-6Software Version Check include 60%Tin 40% lead.To maintain soldering iron and its tin very well.Use the wire brush but not spray cleaners such as Freon to clean the soldering surface.Adopt the melting ways:a) The temperature of soldering horn range from 350 to 390.b) Heat up the parts pin, until soldering tin is molten.c) Use the desoldering pump to suck out the molten soldering tinquickly.Note: Quickly operating can prevent superheating the electronic-plating copper.Adopt the following soldering ways.a) The temperature of soldering horn range from 350 to 390. b) Hold the soldering iron and welding rod pointed to the parts pin,until soldering tin is molten. Then move the soldering horn quickly to the location that you want to solder. Note: Quickly operating can prevent superheating electronic-plating copper of printed circuit board.c) Check the welting zone carefully, then brush the unwanted soldering tin away with a wire brush.Unsolder/Replace ICNotes:Do not touch the IC body directly with soldering iron. Pre-heating soldering iron at about 130 for some seconds avoid the damages caused by IC heated suddenly. For normal IC, the temperature of the solder horn is about 350, and can increase to 390 for some bigger IC.Use the filamentous welding rod and solder which thickness is about 0.3mm to solder thin IC and add the solder as needed.Replace the IC carefully and solder it quickly.After unsoldering the IC, clean the basic board carefully to ensure the board is usable.Prevent the molten soldering tin dripping on the board which will engender a short circuit.Aim at the first terminal and fix it, then aim at other terminals for correctly inserting IC. You can solder quickly just like this.Before operating, please make sure the IC is unusable. Do not unsolder repeatedly. During soldering especially soldering a thin IC with many pins, check the weld carefully.After replacing, check that there is not soldering leak, rosin joint, short circuit and so on. Unsolder:Use the soldering iron to melt the soldering tin.Before unsoldering IC, suck out the molten solder tin.ReplaceÖMake sure all the IC pins are on their correct location, then solder.Use a wire brush to clean the welting zone.Items of Safety Attention2-4Unsolder/replace diodeAfter unsoldering the unusable diode, nip its body and take it out.Bend the two pins and the diode is vertical to circuit board.Check the polarity of the diode, then place its pins to the correct location. Pin the joint and solder it.Check the weld carefully. If the surface of the weld is not smooth, please solder it again.Repair electro-plating copper Repair the warpage copper as following: Use a sharp knife to scrape the unusable copper and the unwanted solder off.Make one side of the lead bent like a small “U”, then put the “U” to IC pins and solder. Another side of the lead is extended until overlap with the well copper then solder. Cut the unwand lead.The flow of repairing DVD partNo sound or sound distorted when playing, please check the DVD part.Notes for taking down the laser headBefore operating, read these notes as following to prevent the static charges damageing the laser head when reading the laser led.Lay an electric rug on the working table and the replaced parts are packed in black package.The electric rug is grounding by put on the electric base.Then put your hand on the electric rug and connect the static handle with the electric rug. Make sure the electric rug and the working table are grounding. During the operating, do something such as operating on the electric rug to avoid the static charges touching the laser parts.After that, you can begin to take the laser parts down. When replace the laser parts, please do something to make a short circuit and remenber to cut the short circuit off after replacing.Set remains closed! NYPlay a CDfor at least 10 minutes Yplayabilityok ? Nplayabilityok ? add Info for customer “SET OK“ check playability NYplayabilityok ? check playability check playability return set Customer complaint “CD related problem“ “fast“ lens cleaning For flap loaders (= access to CD drive possible)cleaning method is recommended Exchange CDM - For description - see following pages 2-5Instruction On CD Playability PLAYABILITY CHECK For sets which are compatible with CD-RW discsuse CD-RW Printed Audio Disc.7104 099 96611 TR 3 (Fingerprint) TR 8 (600µ Black dot) maximum at 01:00 playback of these two tracks without audible disturbance playing time for: Fingerprint 10secondsBlack dot from 00:50 to 01:10 jump forward/backward (search) within a reasonable time For all other setsuse CD-DA SBC 444A.4822 397 30245 TR 14 (600µ Black dot) maximum at 01:15 TR 19 (Fingerprint) TR 10 (1000µ wedge) playback of all these tracks without audible disturbance playing time for: 1000µ wedge 10secondsFingerprint 10secondsBlack dot from 01:05 to 01:25 jump forward/backward (search) within a reasonable time CUSTOMER INFORMATION It is proposed to add an addendum sheet to the set which informs the customer that the set has been checked carefully - but no fault was found. The problem was obviously caused by a scratched, dirty or copy-protected CD. In case problems remain, the customer is requested to contact the workshop directly.The lens cleaning (method ) should be mentioned in the addendum sheet. The final wording in national language as well as the printingis under responsibility of the Regional Service Organizations.LIQUID LENS CLEANINGBecause the material of the lens is synthetic and coated with a special anti-reflectivity layer, cleaning must be done with a non-aggressive cleaning fluid. It is advised to use “Cleaning SolventThe actuator is a very precise mechanical component and may not be damaged in order to guarantee its full function. Clean the lens gently (dont press too hard) with a soft and clean cotton bud moistened with the special lens cleaner. The direction of cleaning must be in the way as indicated in the picture below. Before touching the lens it is advised to clean the surface of the lens by blowing clean air over it. This to avoid that little particles make scratches on the lens. Instruction On CD Playability 2-6Disassembly Diagram3-13-12, Open the Top CabinetA1. Loose 4pcs screws(3x15PA)A1. Loose 1pc screw(3x10FA)A2. Loose 1pc screw(3x10PA)A1. Loose 3pcs screws(3x10FA)3, Remove the DVD Loader MechanismA. Loose 4pcs screws(3x15BA)7, Remove Front CabinetA. Loose 2pcs screws(3x12BA)8, Remove the Display BoardA. Loose 8pcs screws(2.6x8BA)A1AAA2A1A21.Open the DVD Door and loose 2 clippsto remove the door5.Remove the Power BoardA1. Loose 2pcs screws(3x6PT)A2. Loose 3pcs screws(3x12FA)A3. Loose 1pc screw(3x6FMTT)6.Remove the Decoder BoardA4, Remove the SCART & AUX BoardA. Loose 3pcs screws(3x12FA)A1AAA2A39, Remove the Volume BoardA. Loose 3pcs screws(2.6x8BA)A10, Remove the USB & Earphone BoardA. Loose 4pcs screws(2.6x8PWT)A