Technics RS-DV290EG Service manual

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.

- Check the operation P.C.B. as shown below.

3.3. Replacement for the motor ass’y, capstan belt and winding belt

- Follow the (Step 1) - (Step 3) of item 3.1.

- Follow the (Step 1) - (Step 7) of item 3.2.

567

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.

3.5. Replacement for the pinch roller ass’y 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 ass’y

- Follow the (Step 1) - (Step 3) of item 3.1.

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.

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)

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

pressed, the fault items are displayed in sequence.

mode

plunger

replace)

switch

and

S952

replace)

S976).

Check

plunger

mechanism

Fig. 5-2.

Table 5-1.

FL display Symptom Cause

H01 Cassette deck does not operate correctly. Faulty cassette deck mechanism

switch (Deck 1: S951, Deck 2: S971), and capstan motor. / (Check and

H02 Unit does not record or the unit goes into

recording mode even when the erasure prevention tabs have been removed from the cassette.

H03 Tape 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.

H06 Cassette deck does not detect CrO2 tape. Faulty CrO2 tape detect switch (Deck

H07 Cassette deck does not detect Metal tape. Faulty Metal tape detect switch (

F01 When the tape play button is pressed, tape

advances only slightly and then stops.

F02 TPS (tape program search) does not work. Faulty TPS signal detection or faulty

Faulty erasure prevention tabs detect (S974, S975) or short-circuit. (Check replace)

Faulty tape detect switch (Deck 1: S972) or short-circuit. (Check and

Deck 2: S973). / (Check and replace)

and replace)

Reel pulse error (Faulty Hall IC). ( replace)

control. / (Check and replace 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

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.

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:

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

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

When replacing any of components, be sure to use only manufacturer’s 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

101

No.

Terminal

Name

I/O Function

I Power supply terminal

2 VREF I Reference voltage input 3

- GND terminal

4 LMT O Muting control signal output 5 PL1 O Deck 1 solenoid control signal

output

6 M1 O Deck 1 motor drive control

signal output 7 HALT I Power failure detect signal input 8 REQ I Serial communication request

signal input 9 CS I Serial communication complete

signal input

10 CLK O Serial communication clock

signal output

11 DATA

OUT

O Serial communication data

signal output

12 DATA IN I Serial communication data

signal input

13 METAL 2 I Deck 2 tape detect switch signal

(METAL) input

CRO2 2

Deck 2 tape detect switch signal

(CrO2) input

- GND terminal

16 FWD LED O LED drive control signal (FWD)

output

17 REV LED O LED drive control signal (REV)

output

18 RESET I Reset signal input 19 XIN I Oscillator connected terminal (F 20 XOUT O 21

CRO2 1

=8 MHz)

- GND terminal

Deck 1 tape detect switch signal

(CrO2) input

23 MODE I

Deck 1 mechanism switch

signal (MODE) input

24 HALF1 I

Deck 1 mechanism switch

signal (Half) input

25 TPS I TPS signal input 26 A DATA O Serial data signal output for IC

101

27 A CLK O Serial clock signal output for IC

101

28 A LATCH O Serial latch signal output for IC

101

Terminal

Name

No.

29 PL2 O Deck 2 solenoid control signal

30 M2 O Deck 2 motor drive control

31 ENC/DEC O Dolby NR record/playback mode

32 DOLBY

ON/OFF

33 E CS -

36 37 LED CNT O LED color control signal output 38

39 AD SW I

41 KEY2 I Operation key signal input 42 KEY1 I Operation key signal input

PHOTO2T

PHOTO1T

I/O Function

output

signal output

select signal output

O Dolby NR ON/OFF control signal

output

EEPROM chip select signal

output

(Not used, open)

- Not used, open

I Deck 2 reel pulse detect signal

input

Deck 2 mechanism switch signal input (Half, Mode, F REC INH., R REC INH.)

I Deck 1 reel pulse detect 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

- 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 kHz~63 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.

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. )

[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 Value EVM reading

Normal tape :

CrO2 tape:

Metal tape:

Note:

85 ± 25 mA (85 ± 25 mV)

150 ± 25 mA (150 ± 25

mV)

185 ± 25 mA (185 ± 25

mV)

Fig. 13-5.

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

output as a reference (0 dB).

3. Confirm the playback frequency response is within the range

shown in Fig. 13-7.

Fig. 13-6.

Fig. 13-7.

13.8. Recording/playback / frequency response and gain check

(Deck 2)

13.8.1. Normal tape check

1. Connect the measuring instrument as shown in Fig. 13-8.

2. Insert a Normal type blank tape (QZZCRA4) into Deck 2.

3. Record signals at 50 Hz, 100 Hz, 200 Hz, 500 Hz, 1 kHz, 2 kHz, 10

kHz and 12.5 kHz (28 mV).

4. Set the playback frequency of recorded signals at 1 kHz as a

reference response (0 dB).

5. Playback the recorded signal to confirm that the output is within

the range of the overall frequency response shown in Fig. 13-9.

Fig. 13-8.

Fig. 13-9.

13.8.2. CrO2/Metal tape check

1. Connect the measuring instrument as shown in Fig. 13-8.

2. Insert a CrO2/Metal tape into Deck 2.

3. Record signals at 50 Hz, 100 Hz, 200 Hz, 500 Hz, 1 kHz, 2 kHz, 10

kHz and 12.5 kHz (28 mV).

4. Set the playback frequency of recorded signals at 1 kHz as a

reference response (0 dB).

5. Playback the recorded signal to confirm that the output is within

the range of the overall frequency response shown in Fig. 13-10.

Fig. 13-10.

13.9. Adjustment point and test point

Fig. 13-11.

14. Checking Procedure for Self-operation of

Cassette Mechanism Ass’y

- This procedure describes simple methods independent of mechanism controller or governor circuit.

14.1. Operation Check Providing with Cassette Tape

1. Push up the EJECT lever with rubber band. (Refer to Fig. 14-2. )

2. Apply DC 5V to the MOTOR. (MOTOR will be rotated) (Refer to Fig.

14-1. )

3. Provide the cassette tape with mechanism ass’y.

4. Apply DC 9V to the plunger, and then operate it by switching

power ON/OFF. (Power: +PL, -PL) (Refer to Fig. 14-1. ) A. FWD PLAY: Supply power to the plunger momentary. (Duration:

approx. 50msec.)

B. FWD FF: At FWD PLAY mode, supply power to the plunger

momentary. (Duration: approx. 50msec.)

C. STOP: At FWD FF mode, supply power to the plunger

momentary. (Duration: approx. 50msec.)

D. REV PLAY: At STOP mode, supply power to the plunger for

ordinary duration. (Duration: approx. 200msec.)

E. REV REW: At REV PLAY mode, supply power to the plunger

momentary. (Duration: approx. 50msec.)

F. STOP: At REV REW mode, supply power to the plunger

momentary. (Duration: approx. 50msec.)

Repeat the above operation to FWD PLAY mode.

Note: Incorrect duration for power supply may be operated to other mode.

14.1.1. Connection Diagram Between the Mechanism Ass’y and Power Supply /

(MOTOR and Plunger)

Fig. 14-1.

14.1.2. Detail View of EJECT Lever / (EJECT lever fixed by rubber band, Plunger

rib operation)

Fig. 14-2.

14.2. Operation Check Not Provided with Cassette Tape

1. Push up the EJECT lever with rubber band. (Refer to Fig. 14-2. )

2. Apply DC 5V to the MOTOR. (MOTOR will be rotated)

3. Lift up the plunger rib of mechanism ass’y with the tip of minus

screwdriver, and then operate it same as power supply duration. (Refer toFig. 14-3. )

Note: Operation order is same as the “Operation Check Providing with Cassette Tape” item 4. above.

Fig. 14-3.

15. Replacement Parts List

Notes:

- 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. When replacing any of components, be sure to use only manufacture’s specified parts shown in the parts list.

- The marking [RTL] indicates the retention time is limited for this Item. After the discontinuation of this assembly in production, it will no longer available.

- All parts are supplied by SPC.

Ref. No. Part No. Part Name & Description Pcs Remarks

1 RKM0392-S1 CABINET 1

2 RHD30007-1S SCREW 4

3 XTBS3+10JFZ1 SCREW 2

4 RGR0287A-P REAR PANEL 1

5 RKA0105-K RUBBER 4

6 RKA0106-N FOOT RING 4

7 RMN0539 CABLE HOLDER 1

8 RDG0129-1 DAMPER GEAR 2

9 REX0966-1 WIRE ASS'Y 1

10 RGB0025-A TECHNICS BADGE 1

11 RGK1131-2S ORNAMENT(L) 1

12 RGK1132-2S ORNAMENT(R) 1

13 RGL0441-Q PANEL LIGHT 1

14 REZ1194 WIRE ASS'Y 1

15 RKF0462-K2 CASSETTE HOLDER(L) 1

16 RKF0463-K2 CASSETTE HOLDER(R) 1

17 RKF0587G-2S CASSETTE LID(L) 1

18 RKF0588-2S CASSETTE LID(R) 1

19 RKW0577-Q CASSETTE WINDOW(L) 1

20 RKW0578-Q CASSETTE WINDOW(R) 1

21 RMB0474 SPRING 2

22 RMQ0577A-3 FRAME 1

23 RUS757ZA SPRING 4

24 RYP1179-S FRONT PANEL 1

25 XTBS26+10J SCREW 7

26 XTB3+10JFZ SCREW 5

27 XTBS3+8JFZ1 SCREW 3

28 RMG0161 RUBBER 1

Ref. No. Part No. Part Name & Description Pcs Remarks

29 RMR0909-X PCB HOLDER 1

101 RED0037 HEAD BLOCK ASS'Y / (R/P) 1 L1AA00000008

101-1 RHD17015 SCREW 2

102 RED0038 HEAD BLOCK ASS'Y / (P.B) 1

102-1 RHD17015 SCREW 2

103 RDG0300 REEL TABLE BASE 4

104 RDG0301 GEAR 2

105 RDK0026 GEAR 2

107 RDV0033-4 BELT1 2

108 RDV0034-1 BELT2 2

110 RUW147ZA SPRING 2

111 RMB0400 SPRING 4

112 RMB0403 SPRING 2

113 RMB0404 SPRING 2

114 RMB0406 SPRING 2

115 RMB0408 SPRING 2

116 RML0370-J LEVER 2

117 RML0371 LEVER 2

118 RML0372 LEVER 2

119 RML0374 LEVER 2

120 RMM0131 ROD 2

121 RMM0133-1 ROD 2

122 RMQ0519 REEL CAP 4

123 RMS0398-1 SHAFT 2

124 RSJ0003 PLUNGER ASS'Y 2

125 RUS609ZC SPRING 2

126 RXF0049 FLY WHEEL ASS'Y 2

127 RXF0050 FLY WHEEL ASS'Y 2

128 RXG0040 GEAR 4

129 RMK0283A-J SUB CHASSIS 2

130 RXL0124 PINCH ROLLER ASS'Y 2

130-1 RMB0401 SPRING 2

131 RXL0125 PINCH ROLLER ASS'Y 2

131-1 RMB0402 SPRING 2

132 RXL0126 ARM GEAR 2

133 RXQ0412 CHASSIS ASS'Y 2

133-1 RMB0405 SPRING 2

133-2 RMM0132-J FR ROD 2

134 REM0055-1 MOTOR ASS'Y 2

135 RHD26022 SCREW 4

136 XTW2+5L SCREW 4

137 XTW26+10S SCREW 6

138 XYC2+JF17 SCREW 2

140 RFKJSCH770EK MAIN CHASSIS ASS'Y 1

C101-04 ECUV1H681KBN 50V 680P 4 F1J1H681A021

C109,10 ECQB1H183JF3 50V 0.018U 2

C111,12 ECEA0JKS470 6.3V 47U 2

C113,14 ECEA1HKS2R2 50V 2.2U 2

C115,16 ECJ2VB1H471K 50V 470P 2

C117,18 ECUX1H331KBX 50V 330P 2

C119,20 ECA1HAK010XI 50V 1U 2

C123,24 ECEA1EKS4R7 25V 4.7U 2

C125,26 ECJ2VB1H332K 50V 3300P 2

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