sony pcm-r300_ver1.1电路图 维修原理图.pdf

1 SERVICE MANUAL PCM-R300 DIGITAL AUDIO RECORDER US Model Canadian Model AEP Model UK Model SPECIFICATIONS Model Name Using Similar Mechanism Tape Transport Mechanism Type DTC-A6 DATM-110A Continued on next page Ver 1.1 2001. 06 9-922-708-12 2001F0200-1 2001.6 Sony Corporation Home Audio Company Shinagawa Tec Service Manual Production Group 2 ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT! LES COMPOSANTS IDENTIFIS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHMATIQUES ET LA LISTE DES PICES SONT CRITIQUES POUR LA SCURIT DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PICES SONY DONT LES NUMROS SONT DONNS DANS CE MANUEL OU DANS LES SUPPLMENTS PUBLIS PAR SONY. SAFETY-RELATED COMPONENT WARNING ! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. MODEL IDENTIFICATION Back Panel Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be damaged by heat. Parts No. 3-018-941-0 : US, Canadian model 3-018-941-1 : AEP , UK model 3 TABLE OF CONTENTS 1. SERVICING NOTE.4 2. GENERAL. 5 3. DISASSEMBLY 3-1. Case.14 3-2. Cassette Window .14 3-3. Mechanism Deck . 14 3-4. Cassette Holder Assembly . 14 3-5. Cassette Compartment Motor (M901), Pulley, Driving Gear and Slider . 15 3-6. Drum Drive Board and Driving Chassis .15 3-7. Drum .16 3-8. Capstan Motor (M902) .16 4. ADJUSTMENTS. 17 5. DIAGRAMS 5-1. Circuit Boards Location .21 5-2. Block Diagrams MD Section. 22 Main Section. 23 Display/Power Section.25 5-3. Schematic Diagram MD Section . 26 5-4. Printed Wiring Board MD Section .29 5-5. Printed Wiring Board Main Section .32 5-6. Schematic Diagram Main Section (1/3) .35 5-7. Schematic Diagram Main Section (2/3) .38 5-8. Schematic Diagram Main Section (3/3) .41 5-9. Printed Wiring Board Dispaly Section .44 5-10. Schematic Diagram Display Section . 47 5-11. IC Block Diagrams .49 5-12. IC Pin Functions.53 6. EXPLODED VIEWS 6-1. Case and Back Panel Section. 59 6-2. Front panel Section .60 6-3. Chassis Section .61 6-4. Cassette Compartment Section .62 6-5. Chassis L/R Section . 63 6-6. Mechanism Section-1 (DATM-110A) . 64 6-7. Mechanism Section-2 (DATM-110A) . 65 6-8. Mechanism Section-3 (DATM-110A) . 66 7. ELECTRICAL PARTS LIST. 67 SAFETY CHECK-OUT After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below. LEAKAGE The AC leakage from any exposed metal part to earth Ground and from all exposed metal parts to any exposed metal part having a re- turn to chassis, must not exceed 0.5 mA (500 microampers). Leak- age current can be measured by any one of three methods. 1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers instructions to use these instruments. 2. A battery-operated AC milliammeter. The Data Precision 245 digi- tal multimeter is suitable for this job. 3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A) Fig. A. Using an AC voltmeter to check AC leakage. AC voltmeter (0.75V) 1.5k 0.15F Earth Ground To Exposed Metal Parts on Set 4 SECTION 1 SERVICING NOTE Fluorescent indicator tube lit, key check mode The Fluorescent indicator tubes and keys can be checked in this test mode. Settings:INPUT switch: Center click ID MODE switch: Center click REC MODE switch : Center click NOTE:The method differs for when the remote commander provided is used or not. Method: 1. Disconnect the AC plug from the outlet, and short-circuit the TP (TEST) of the display board and ground. 2. Connect the AC plug to the outlet, and turn on the power to start the check. Flow: The left and right segments of the Fluorescent indicator tubes and level meters light up, and the grids light up in order from the right side. The level meters go off one by one. Operate the remote commander for DAT in this state. Pressing the 6button will display “NEXT KEY” and set the key check mode. Pressing a button on the panel or switching a switch will light up the level meters one by one. When all buttons and switches have been operated, all the level meters will be lit and “KEY OK” will be displayed instantaneously. “TEST END” is displayed and the test mode is ended. To reset the test mode, turn the power off and disconnect the wire shorting TP (TEST) and ground. Test mode IC801 TP (TEST) Pressing the 4button will turn off the segments on the left and right sides. Pressing the 7button will display “TEST END” and end the test mode. Part Location DISPLAY BOARD (Conductor side) (If the remote commander is not used) Press the pSTOP button. “NEXT RMC” will be displayed. Press the ”PLAY button for more than 1 second, and then press the PPAUSE button. “NEXT KEY” will be displayed and the key check mode will be set. (If the remote commander is used) (If the remote commander is used) (If the remote commander is not used) To end the test mode, disconnect the AC plug from the outlet. 5 SECTION 2 GENERAL Location of Parts and Controls Front panel 1Display window 20/) (REW/FF), DATA buttons 3MODE, MENU button 4RESET, ENTER button 5Cassette holder 6Remote sensor 7MARGIN RESET button 8WRITE button 9START ID AUTO button 10START ID RENUMBER button 11START ID REHEARSAL button 12ERASE button 13REC LEVEL control 14PHONE LEVEL control 15PHONES jack 16SBM switch 17REC MODE switch 18ID MODE switch 196 OPEN / CLOSE button 20r REC button 21R REC MUTE button 22P PAUSE button 23( PLAY button 24=/+ AMS, SELECT buttons 25p STOP button 26POWER button 27INPUT switch 28COUNTER MODE button 29COUNTER RESET button 30Numeric buttons 31CLEAR button 32REPEAT button Remote commander (RM-D757) 27262524 23222120191817161514 13121110987654321 19 32 31 21 25 24 2 22 23 20 30 29 28 6 This section is extracted from instruction manual. 7 8 9 10 11 12 13 14 SECTION 3 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. 3-3. MECHANISM DECK 3-4. CASSETTE HOLDER ASSSEMBLY 3-1. CASE Unscrew the four case attachment screws and remove the case. 3-2. CASSETTE WINDOW 1Press the OPEN/CLOSE switch to effect LOADING OUT STATE (if power is not supplied) rotate the pulley in the left side of the Mechanism Deck counterclockwise.) 2Remove the cassette by lifting the window up. 1 Four screws (PTTWH3x6) 2 Connector (CN1) 3 Connector (CN302) 4 Connector (CN341) 5 Connector (CN301) 6 Mechanism deck 2 Cassette holder assembly 5 Holder (Window) 3 Screw (BVTP3x6) 4 Spring (Cassette) 1 Screw (Step) 15 3-5. CASSETTE COMPARTMENT MOTOR (M901), PULLEY, DRIVING GEAR AND SLIDER 3-6. DRUM DRIVE BOARD AND DRIVING CHASSIS 9 Cassette compartment motor (M901) 8 Two screws (P2.6x3) 6 Two screws (BTP1.7x3) 2 Screw (BTP1.7x3) 4 Screw (BTP1.7x3) 1 Belt (Driving) 3 Pulley 5 Driving gear 7 Slider 2 Two screw (B2.6x4) 4 Drum drive board 1 Screw (BTP2.6x6) 6 Screw (BTP2.6x8) 5 Two screw (BTP2.6x8) 8 Driving chassis 7 Screw (B2.6x4) 3Remove the lead wires from connectors on the drum drive board. 16 3-7. DRUM 3-8. CAPSTAN MOTOR (M902) 2 Four screws (B2x4) 5 Drum 3 Shield case 1 Lever (Cleaner) assembly 1 Three screws (P1.7x4) 2 Capstan motor (M902) 4Remove the drum lead wires from connectors. 17 Hub hole Hub hole Slider lock Slider Slider lock Lid Slider Cut here. Tape Step screw Spring (cassette) Screw (BVTP3x6) Holder Holder (window) SECTION 4 ADJUSTMENTS 4-1. Notes When Making Adjustments 1. Adjustments should be performed in the order listed. 2. Use the following test tapes: TY-7111X (8-909-823-00). Level TY-7252 (8-909-822-00). Tracking TY-7551 (8-909-814-00). Functions TY-30B (8-892-358-00) . Blank Use the following torque meter: TW-7131 (8-909-708-71) . FWD 3. Switches and controls should be set as follows unless otherwise specified. ID MODE switch: START REC MODE switch: LONG INPUT switch: OPT SBM switch: OFF REC LEVEL control: Min. PHONE LEVEL control : Min. 4. Creating an end sensor cassette (1)Press the tape slider lock and move the slider in the direction indicated by the arrow. (2)Open the lid and cut the tape. (3)Turn the hubs until the tape is completely inside the cassette (both T and S sides). The end sensor cassette for end sensor adjustments is now ready for use. 5. Cleaning of the Revolving Drum (1)Fold a cleaning piece (2-034-697-00) or a knit cloth into 4 or more files, slightly impregnate it with a head cleaning fluid (9- 919-573-00), and softly touch the drum with it and manually rotate the drum slowly counterclockwise by 2 to 3 turns for cleaning. (2)At that time, be careful not to move the cleaning piece vertically to the head tip. Otherwise, the head tip may probably be damaged. 6. Be careful not to move RV1 to RV2 on the RF AMP board in the mechanism assemlby 7. To adjust the tape path and guides, remove the holder assembly as shown in the diagram and use the DAT cassette holder jig (J-8000- 002-A). This will make it easier to perform the adjustments. First turning the pulley counterclockwise to put it in loading out status will make removal and reattachment of the holder assembly easier. To perform adjustments, turn the pulley clockwise to put it in loading in status, load the cassette tape and set the IN switch to the ON position. 8. Test mode To set the test mode, short-circuit JW091 (X TEST) and ground of the main board. (At this time, the dB display of the fluorescent display level meter will blink.) Perform the following adjustments in the test mode. FWD torque adjustment FWD back tension check Tape path fine adjustments DPG adjustment AGC voltage check End sensor check To reset the test mode (main), disconnect the wire shorting JW091 (X TEST) and ground. After completion of adjusting, be sure to reset the test mode (main). 18 4-2. ELECTRICAL ADJUSTMENTS FWD Torque Adjustment Procedure: 1. Set the test mode (main) and load the FWD torque meter TW- 7131 (8-909-708-71) . 2. Set the PLAY () mode.“TORQUE” will be displayed on the fluorescent indicator tube. 3. Adjust RV451 so that the minimum value of FWD take up torque (take-up side rewinding torque) is between 9-10g cm (0.13-0.14 oz inch). Also, make sure that the maximum reading does not exceed 15g cm (does not exceed 0.21 oz inch). 4. Confirm that the value indicated by the torque meter is maintained for one full cycle. FWD Back Tension Check and Adjustment Check procedure: 1. Put the set into the test mode (main servo) and load the FWD torque meter TW-7131 (8-909-708-71). 2. Put the set into the PLAY () mode. 3. Turn the FWD back tension adjustment screw locked on the mechanical deck side so that the minimum value of FWD back tension torque (supply side) is between 4.5 to 7.5g cm- (0.06- 0.1 oz inch). Also, make sure that the maximum reading does not exceed 8g cm (does not exceed 0.11 oz inch). After completion of adjusting, be sure to apply screw lock. 4. Confirm that value indicated by the torque meter is maintained for one full cycle. 5. If the specified values are not satisfied, replace the lever (BT) assembly (X-3363-024-1). To tighten (clockwise) - back tension becomes larger. to loosen (counterclockwise)-back tension becomes smaller. Tape Path Fine Adjustment (x1.5 FWD Mode) Perform the following adjustment when the drum has been replaced. Procedure: 1. Connect an oscilloscope CH-1 to JW183 (PBRF) and CH-2 to JW092 (SWP) on the main board. 2. Set the test mode (main) and load test tape TY-7252 (8-909-822- 00). 3. Press the AMS (+) key. “DPG” will be displayed on the fluorescent indicator tube. Each part of switches on Test Mode. FWD back tension adjustment screw (+P2x2.5) OPTCOAXIAL INPUT ANALOG OFFSET 48 kHz 44.1 kHz LONG STANDARD REC MODE OFF ON AFT 0+ 9. Check the following items for correct tape speed, after completion of adjusting. (1)Set the REC MODE switch to 48k and check for normal recording and playback. (x1) (2)Set the REC MODE switch to LONG and check for normal recording and playback. (x0.5) (3)With QUE (”+) or REVIEW (”+0), check that qurrr, qurrr sound is heard. (x3, x8) (4)Check that correct time is displayed after FF () or REV (0). (x16) (5)Check that AMS (+, =) is normal. 19 20 DPG Adjustment Perform the following adjustment without fail when the drum has been replaced. Procedure: 1. Connect oscilloscope CH-1 to JW183 (PBRF) and CH-2 to JW092 (SWP) on the main board. (Use CH-2 as the trigger.When the CH-2 signal is inverted, the trailing edge can be used for synchronization.) 2. Set the test mode (main) and load test tape TY-7252 (8-909-822- 00). 3. Set the REC MODE switch to LONG (ATF: ON) and the INPUT sw