Technics-SCDV-290-Service-Manual电路原理图.pdf

AD0303010C8 Cassette Deck RS-DV290EG Colour (S).Silver Type SPECIFICATIONS 1. Note Refer to the service manual for Model No. SA-EH590EG, SA-EH590EP (Order No. AD0302008C8) for information on Accessories and Packaging. 2. Location of Controls 3. Operation Checks and Component Replacement / Procedures - This section describes procedures for checking the operation of the major printed circuit boards and replacing the main components. - For reassembly after operation checks or replacement, reverse the respective procedures. Special reassembly procedures are described only when required. 3.1. Checking for the main P.C.B. - Check the main P.C.B. as shown above. 3.2. Checking for the operation P.C.B. - Follow the (Step 1) - (Step 3) of item 3.1. 2 3 - Check the operation P.C.B. as shown below. 3.3. Replacement for the motor assy, capstan belt and winding belt - Follow the (Step 1) - (Step 3) of item 3.1. 4 - Follow the (Step 1) - (Step 7) of item 3.2. 5 6 7 3.4. Replacement for the components parts on the mechanism P.C.B. - Follow the (Step 1) - (Step 3) of item 3.1. - Follow the (Step 1) - (Step 7) of item 3.2. - Follow the (Step 1) - (Step 4) of item 3.3. 8 3.5. Replacement for the pinch roller assy and head block - Follow the (Step 1) - (Step 3) of item 3.1. - Follow the (Step 1) - (Step 7) of item 3.2. - Follow the (Step 1) - (Step 5) of item 3.3. 3.6. Replacement for the cassette lid assy - Follow the (Step 1) - (Step 3) of item 3.1. 9 3.7. Replacement for the cassette holder - Follow the (Step 1) - (Step 3) of item 3.1. - Follow the (Step 1) - (Step 11) of item 3.2. 10 4. To Supply Power Source This unit is designed to operate on power supplied from system connected. / When a component requires service, use the system connections to supply power source. / For system connections, refer to Fig.4-1. Fig. 4-1. 5. Service Mode Function of Cassette Mechanism This unit is equipped with a service mode function of cassette mechanism, so that if the unit operates incorrectly, the fault displayed using an error code on the FL display of the Tuner/ Amplifier (SA-EH590). The system control IC and FLdisplay are part of the Tuner/Amplifier so make sure the system has been connected properly before using this function. Use this function during maintenance to check faults of items below. 5.1. Cassette tape to be prepared Metal tape: Recorded music tape with only one erasure prevention tab intact. / (use middle portion of tape) Normal tape: / CrO2 tape: Recorded music tape with both erasure prevention tabs intact. / (use middle portion of tape) 11 5.2. Selecting service mode 1. Turn on the power to the unit. 2. Make sure that no tape is inserted in the cassette deck. (Service mode cannot be selected with a tape inserted in the cassette deck.) 3. Press the DOLBY NR button for about 2 seconds, and keep pressing it, also press the STOP button for about 2 seconds. Refer to Fig. 5-1. Fig. 5-1. 5.3. Deck 1 mechanism check 1. Press the Deck 1/deck 2 select button to change the flashing Deck 2 indicator to Deck 1. Refer to Fig. 5-2. / (No change required if Deck 1 indicator already flashing.) 2. Press the Deck 1 cassette holder open button to open the Deck 1 cassette holder. Refer to Fig. 5-2. 3. Insert a CrO2 tape into the Deck 1 and close the cassette holder. 4. Press the Fast forward button. Refer to Fig. 5-2. / (Tape fast forwards for about 2 seconds then stops.) 5. Press the PLAY button. Refer to Fig. 5-2. / (After TPS operation and check, the tape stops.) 6. Open the Deck 1 cassette holder and replace the tape with a normal tape. 7. Close the Deck 1 cassette holder. 8. Press the Record pause button. Refer to Fig. 5-2. / (No record operation.) 9. Press the STOP button. Refer to Fig. 5-2. A mechanism error code is displayed. Refer to Table 5-1. Each time the STOP button is 12 pressed, the fault items are displayed in sequence. Fig. 5-2. Table 5-1. FL displaySymptomCause H01Cassette deck does not operate correctly.Faulty cassette deck mechanism mode switch (Deck 1: S951, Deck 2: S971), plunger and capstan motor. / (Check and replace) H02Unit does not record or the unit goes into recording mode even when the erasure prevention tabs have been removed from the cassette. Faulty erasure prevention tabs detect switch (S974, S975) or short-circuit. (Check and replace) H03Tape does not play even when the tape deck play button is pressed. The motor operates when the tape deck play button is pressed even if cassette is loaded in the deck. Faulty tape detect switch (Deck 1: S952 S972) or short-circuit. (Check and replace) H06Cassette deck does not detect CrO2 tape.Faulty CrO2 tape detect switch (Deck 1 Deck 2: S973). / (Check and replace) H07Cassette deck does not detect Metal tape.Faulty Metal tape detect switch (S976). and replace) F01When the tape play button is pressed, tape advances only slightly and then stops. Reel pulse error (Faulty Hall IC). (Check replace) F02TPS (tape program search) does not work.Faulty TPS signal detection or faulty plunger control. / (Check and replace mechanism control IC) 5.4. Deck 2 mechanism check 1. Press the Deck 1/deck 2 select button to change the flashing Deck 1 indicator to Deck 2. Refer to Fig. 5-3. 2. Press the Deck 2 cassette holder open button to open the Deck 2 13 cassette holder. Refer to Fig. 5-3. 3. Insert a metal tape into the Deck 2 with an intact erasure prevention tab on the right side. 4. Close the Deck 2 cassette holder. 5. Press the Fast forward button. Refer to Fig. 5-3. / (Tape fast forwards for about 2 seconds then stops.) 6. Open the Deck 2 cassette holder and turn over the metal tape. (intact erasure prevention tab on the left side.) 7. Close the Deck 2 cassette holder. 8. Press the Rewind button. Refer to Fig. 5-3. / (Tape rewinds for about 2 seconds then stops.) 9. Open the Deck 2 cassette holder and replace the metal tape with a CrO2 tape. 10. Close the Deck 2 cassette holder. 11. Press the PLAY button. Refer to Fig. 5-3. / (After TPS operation and check, the tape stops.) 12. Open the Deck 2 cassette holder and replace the CrO2 tape with a normal tape. 13. Close the Deck 2 cassette holder. 14. Press the Record pause button. Refer to Fig. 5-3. / (No record operation.) 15. Press the STOP button. Refer to Fig. 5-3. A mechanism error code is displayed. Refer to Table 5-1. Each time the STOP button is pressed, the fault items are displayed in sequence. Fig. 5-3. 14 5.5. Exiting service mode 1. Press the STOP button for more than 5 seconds. (Diagnostic contents stored in memory for both Deck 1 and 2 are erased.) 2. Remove the cassette tape from the cassette holder. 3. Turn off the unit. 6. Schematic Diagram Notes - This schematic diagram may be modified at any time with the development of new technology. Notes: S900: Stop switch () S901: Deck 2 cassette holder open switch (OPEN) S903: Tape edit switch (TAPE EDIT) S904: Record pause switch / (REC PAUSE) S905: Dolby noise reduction switch / (DOLBY NR) S906: 15 Fast forward, TPS switch () S907: Forward side playback switch () S909: Reverse side playback switch () S910: Rewind, TPS switch () S911: Reverse mode switch / (REV MODE) S912: Deck 1/deck 2 select switch / (DECK 1/2) S913: Counter display switch / (COUNTER DISPLAY) S914: Counter reset switch / (COUNTER RESET) S915: Deck 1 cassette holder open switch (OPEN) S951: Deck 1 mode detect switch S952: Deck 1 half detect switch S953: Deck 1 CrO2 tape detect switch S971: Deck 2 mode detect switch S972: Deck 2 half detect switch S973: Deck 2 CrO2 tape detect switch 16 S974: Deck 2 reverse side record prevention tab detect switch S975: Deck 2 forward side record prevention tab detect switch S976: Deck 2 METAL tape detect switch VR101: Deck 1 playback gain adjustment VR / (R ch) VR102: Deck 2 playback gain adjustment VR / (L ch) VR103: Deck 2 playback gain adjustment VR / (R ch) VR104: Deck 1 playback gain adjustment VR / (L ch) VR801: Deck 1 tape speed adjustment VR (normal) VR803: Deck 2 tape speed adjustment VR (normal) - Indicated voltage values are the standard values for the unit measured by the DC electronic circuit tester (high-impedance) with the chassis taken as standard. Therefore, there may exist some errors in the voltage values, depending on theinternal impedance of the DC circuit tester. No mark : Playback ( ) : Recording - Important safety notice: Components identified by mark have special characteristics important for safety. Furthermore, special parts which have purposes of fire-retardant (resistors), high-quality sound (capacitors), low-noise (resistors), etc. are used. 17 When replacing any of components, be sure to use only manufacturers specified parts shown in the parts list. - The supply part number is described alone in the replacement parts list. - Caution! IC and LSI are sensitive to static electricity. Secondary trouble can be prevented by taking care during repair. Cover the parts boxes made of plastics with aluminum foil. Ground the soldering iron. Put a conductive mat on the work table. Do not touch the legs of IC or LSI with the fingers directly. - Voltage and signal line : Positive voltage line : Playback signal line : Recording signal line 7. Schematic Diagram 8. Printed Circuit Board Diagram 9. Type Illustration of ICs, Transistors and Diodes 10. Wiring Connection Diagram 11. Block Diagram 12. Terminal Function of ICs 12.1. IC701 (M38503M2406F): / System Control 18 Pin No. Terminal Name I/OFunction 1VCCIPower supply terminal 2VREFIReference voltage input 3AVSS-GND terminal 4LMTOMuting control signal output 5PL1ODeck 1 solenoid control signal output 6M1ODeck 1 motor drive control signal output 7HALTIPower failure detect signal input 8REQISerial communication request signal input 9CSISerial communication complete signal input 10CLKOSerial communication clock signal output 11DATA OUT OSerial communication data signal output 12 DATA INISerial communication data signal input 13 METAL 2IDeck 2 tape detect switch signal (METAL) input 14CRO2 2IDeck 2 tape detect switch signal (CrO2) input 15VSS-GND terminal 16 FWD LEDOLED drive control signal (FWD) output 17 REV LEDOLED drive control signal (REV) output 18RESETIReset signal input 19XINIOscillator connected terminal (F =8 MHz)20XOUTO 21VSS-GND terminal 22CRO2 1IDeck 1 tape detect switch signal (CrO2) input 23MODEIDeck 1 mechanism switch signal (MODE) input 24HALF1IDeck 1 mechanism switch signal (Half) input 25TPSITPS signal input 26A DATAOSerial data signal output for IC 101 27A CLKOSerial clock signal output for IC 101 28 A LATCHOSerial latch signal output for IC 101 19 101 Pin No. Terminal Name I/OFunction 29PL2ODeck 2 solenoid control signal output 30M2ODeck 2 motor drive control signal output 31 ENC/DECODolby NR record/playback mode select signal output 32 DOLBY ON/OFF ODolby NR ON/OFF control signal output 33E CS-EEPROM chip select signal output (Not used, open) 34 | 36 NC - Not used, open 37 LED CNTOLED color control signal output 38PHOTO2TIDeck 2 reel pulse detect signal input 39AD SWIDeck 2 mechanism switch signal input (Half, Mode, F REC INH., R REC INH.) 40PHOTO1TIDeck 1 reel pulse detect signal input 41KEY2IOperation key signal input 42KEY1IOperation key signal input 13. Measurements and Adjustments Note: This unit RS-DV290 is designed to operate on power supplied from system connected. 13.1. Measurement condition - Dolby NR switch is OFF - Make sure heads are clean - Make sure capstan and pressure roller are clean - Temperature is 20 5 C 13.2. Measurement instrument and special tool - Electronic Voltmeter - Frequency Counter 20 - AF Oscillator - Test tape - Head azimuth adjustment (8 kHz, -20 dB): QZZCFM - Tape speed adjustment (3 kHz, -10 dB): QZZCWAT - Playback gain adjustment (315 Hz, 0 dB): QZZCFM - Recording/playback frequency response check: QZZCFM / (315 Hz, -20 dB, 12.5 kHz63 Hz, -20 dB) QZZCRA4 (Normal blank tape) QZZCRX2 (CrO2 blank tape) QZZCRZ6 (Metal blank tape) 13.3. Head azimuth adjustment (Deck 1/2) 1. Connect the measuring instrument as shown in Fig. 13-1. 2. Replace azimuth screws for both forward and reverse directions after removing the screw-locking bond left on the head base. (Supply part No. of azimuth screw: RHD17015 ) 3. Playback the azimuth adjustment portion (8 kHz, -20 dB) of test tape (QZZCFM). Adjust the azimuth screw until the outputs of the L/ R ch are maximized. Refer to Fig. 13-2. Make sure that thedifference in the peak level between the left and right channels does not exceed 0.5 dB. 4. Perform the same adjustment in reverse playback mode. Check of the level difference forward and reverse directions. 5. Playback the playback gain adjustment portion (315 Hz, 0 dB) of test tape (QZZCFM). Check if level difference between forward and reverse direction is within 1.5 dB. 6. After the adjustment, apply screw lock to the azimuth screw. Fig. 13-1. Fig. 13-2. 21 13.4. Tape speed adjustment / (Deck 1/2) Note: When connecting the unit to other system components for test, short the section between the test point TP604 and TP609 and turn on the entire system. (The unit is set to the TEST mode, and either Deck 1 or Deck 2 indicatorwill blink.) Normal speed (Standard value: 3000 45 Hz) 1. Connect the measuring instrument as shown in Fig. 13-3. 2. Playback the middle portion of test tape. (QZZCWAT) 3. Adjust VR801 (Deck 1) and VR803 (Deck 2) for output value shown below. (For adjustment point, refer to Fig. 13-11. ) Adjustment target: 3000 15 Hz (Normal speed) Standard value: 3000 45 Hz (Normal speed) Fig. 13-3. Note: When the unit is finished for adjusting, disconnect the short section between TP604 and TP609 . 13.5. Playback gain adjustment (Deck 1/2) 1. Connect the measuring instrument as shown in Fig. 13-4. 2. Find the start of the 315 Hz, 0 dB section of test tape (QZZCFM), insert the tape into Deck 1 and 2, and play it back (FWD). 3. Adjust Deck 2: VR102 (L ch) VR103 (R ch) and Deck 1: VR104 (L ch) VR101 (R ch) so that the output is within the standard value shown below. (For adjustment point, refer to Fig. 13-11. ) 22 Standard value:265 mV 300 mV Fig. 13-4. 13.6. Erase current confirmation (Deck 2) 1. Connect the measuring instrument as shown in Fig. 13-5. 2. Insert the blank tape into Deck 2, and press the Record pause button. 3. Check if the output at this time between the erase current confirmation point TP301 and TP302 (the output on both edged of R313) is within the standard value shown below. (For the erase current confirmation point, referto Fig. 13-11. ) Standard ValueEVM reading Normal tape : 85 25 mA(85 25 mV) CrO2 tape:150 25 mA(150 25 mV) Metal tape:185 25 mA(185 25 mV) Fig. 13-5. Note: The test tape is not required when confirming the erase current. 13.7. Playback frequency response check (Deck 1/2) 1. Connect the measuring instrument as shown in Fig. 13-6. 2. Playback the 315 Hz, -20 dB and 12.5 kHz to 63 Hz, -20 dB sections of test tape (QZZCFM) and then, using the 315 Hz, -20 dB playback 23 output as a re