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Service Manual
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AD0102028C2
Cassette Deck
RS-DV250
l
AR-2 Mechanism series
Colour
(S)..........Silver Type
Area
(E)..........Europe.
© 2001 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
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http://servis-manual.com/

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Summary of Contents for Technics RS-DV250

  • Page 1 Service Manual TOP NEXT AD0102028C2 Cassette Deck RS-DV250 AR-2 Mechanism series Colour (S)..Silver Type Area (E)..Europe. © 2001 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. TOP NEXT http://servis-manual.com/...
  • Page 2: Service Mode Function Of Cassette Mechanism

    5 Service Mode Function of Cassette Mechanism TOP PREVIOUS NEXT 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- EH770).
  • Page 3 5.1 Cassette tape to be prepared TOP PREVIOUS NEXT 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) TOP PREVIOUS NEXT http://servis-manual.com/...
  • Page 4: Selecting Service Mode

    5.2 Selecting service mode TOP PREVIOUS NEXT 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.
  • Page 5 5.3 Deck 1 mechanism check TOP PREVIOUS NEXT 1. Press the Deck 1/deck 2 select button to change the flashing Deck 2 indicator to Deck 1. Refer 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.
  • Page 6 5.4 Deck 2 mechanism check TOP PREVIOUS NEXT 1. Press the Deck 1/deck 2 select button to change the flashing Deck 1 indicator to Deck 2. Refer Fig. 5-3. 2. Press the Deck 2 cassette holder open button to open the Deck 2 cassette holder. Refer to Fig.
  • Page 7: Exiting Service Mode

    5.5 Exiting service mode TOP PREVIOUS NEXT 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. TOP PREVIOUS NEXT http://servis-manual.com/...
  • Page 8 13.3 Head azimuth adjustment (Deck 1/2) TOP PREVIOUS NEXT 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.
  • Page 9: Tape Speed Adjustment/(Deck 1/2)

    13.4 Tape speed adjustment/(Deck 1/2) TOP PREVIOUS NEXT Note: When connecting the unit to other system components for test, short the section between the test point TP604 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 ±...
  • Page 10 14.1.1 Connection Diagram Between the Mechanism Ass’y and Power Supply/(MOTOR and Plunger) TOP PREVIOUS NEXT Fig. 14-1. TOP PREVIOUS NEXT http://servis-manual.com/...
  • Page 11 14.1.2 Detail View of EJECT Lever /(EJECT lever fixed by rubber band, Plunger rib operation) TOP PREVIOUS NEXT Fig. 14-2. TOP PREVIOUS NEXT http://servis-manual.com/...
  • Page 12: Main Circuit

    MAIN CIRCUIT :POSITIVE VOLTAGE LINE : RECORDING SIGNAL LINE : PLAYBACK SIGNAL LINE R101 C123 5.6K 25V4.7 R157 9.6V C150 Q101 (0.2V) C143 C115 10V100 DECK1 CP101 470P 470P 2SJ164RTA HEAD SELECT (REC:ON) C117 330P PLAYBACK HEAD C129 R117 10V22 IC101 4.5V 4.5V...
  • Page 13 :POSITIVE VOLTAGE LINE : RECORDING SIGNAL LINE : PLAYBACK SIGNAL LINE DOLBY R725 2.2K C207 270P C203 R209 R211 R221 C225 25V4.7 L201 25V4.7 C205 50V1 C218 R237 R220 50V0.1 DOLBY ON : 0V 4.8V 9.6V 4.7V 4.7V 4.6V 4.7V 0.4V 4.8V ON/OFF...
  • Page 14: Mechanism Circuit (Deck1)

    MAIN CIRCUIT :POSITIVE VOLTAGE LINE Q807 Q809 Q810 Q808 2SB621ARSTA DTC143EUT106 DTC143EUT106 2SB621ARSTA SOLENOID DRIVE SOLENOID DRIVE SOLENOID DRIVE SOLENOID DRIVE 10.3V R802 R823 R824 R812 10.3V 10.3V 10.3V 10.2V 10.2V 10.3V Q805 DTA143EUT106 MOTOR DRIVE CONT. Q803 2SD592ARSTA MECHANISM CIRCUIT (DECK1) MOTOR DRIVE R814 9.8V...
  • Page 15 :POSITIVE VOLTAGE LINE : RECORDING SIGNAL LINE : PLAYBACK SIGNAL LINE 4.8V Q701,703 2SD1819ARTX R738 R747 5ms. 2V/DIV. INTERFACE 4.8V R704 16 ms. 1.9V 4.7K 0.1V 3.6V Q701 R708 16ms. 1.8V 4.7K R737 1.2V R736 Q703 F=8MHz R705 L701 R711 10 H 100K R722...
  • Page 16: Operation Circuit

    :POSITIVE VOLTAGE LINE OPERATION CIRCUIT :PLAYBACK SIGNAL LINE Q901 S907 DTA143EUT106 D907 SML79455C LED DRIVE Q903 R916 DTC143EUT106 S912 S906 LED DRIVE ( DECK 1/2 ) 4.2V S911 S905 ( REV MODE ) ( DOLBY NR ) D905 SML79455C R914 Q904 S910 S904...

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