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WM-EX678

AEP Model

UK Model

SERVICE MANUAL

CASSETTE PLAYER

MICROFILM

Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY” and the double-D symbol 

a

 are trademarks

of Dolby Laboratories Licensing Corporation.

SPECIFICATIONS

Model Name Using Similar Mechanism

NEW

Tape Transport Mechanism Type

MT-WMEX672-162

Tape section

Frequency response
(Dolby NR off)

Playback : 30 – 18,000 Hz

Output

Headphones (REMOTE 

2

 jack)

Load impedance 8 – 300 

General

Power requirements

1.5 V
One rechargeable battery or one R6 (size AA)
battery

Dimensions (w/h/d)

Approx. 77.7 

×

 109.1 

×

 21.4 mm

(3

1

/

8

 

×

 4

3

/

8

 

×

 

27

/

32

 inches), incl.

projecting parts and controls

Mass

Approx. 140 g (5.0 oz.)
Approx. 205 g (7.3 oz)
(incl. rechargeable battery and cassette)

Supplied accessories

Battery case (1)
Stereo earphones with remote control (1)
Battery charger (1)
Rechargeable battery
(NC-6WM, 1.2 V, 600 mAh, Ni-Cd) (1)
Rechageable battery carrying case (1)
Carrying pouch (1)

Design and specification subject to change without notice.

Ver 1.0  1999 . 01

Summary of Contents for Walkman WM-EX678

Page 1: ...Hz Output Headphones REMOTE 2 jack Load impedance 8 300 Ω General Power requirements 1 5 V One rechargeable battery or one R6 size AA battery Dimensions w h d Approx 77 7 109 1 21 4 mm 31 8 43 8 27 32 inches incl projecting parts and controls Mass Approx 140 g 5 0 oz Approx 205 g 7 3 oz incl rechargeable battery and cassette Supplied accessories Battery case 1 Stereo earphones with remote control ...

Page 2: ...TIC 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 1 SERVICE NOTE 3 2 GENERAL 5 3 DISASSEMBLY 3 1 CASE BLOCK ASSEMBLY 7 3 2 MAIN BOARD 8 3 3 BELT F2 8 3 4 MOTOR F2 M901 9 3 5 CASSETTE LID ASSEMBLY 9 3 6 REEL ORNAMENT ASSEMBLY 10 3 7 HOLDER ASSEMBLY 10 3 8 PI...

Page 3: ...can be moved when the main power of the regulated power supply is turned OFF once then back ON Move the FWD REV switch S701 to the center position in synchronism with the timing when the slider NR is moved 3 FF REW modes 1 Check that the PRE SET status is set 2 Connect square wave or sine wave to TP53 P IN and TP14 GND See illustration below 3 Press the p switch S702 to enter the STOP mode 4 Press...

Page 4: ...Gear REEL T side Gear NR FWD Left side REV Right side Idler Gear Idler Gear A S side Idler Gear A T side Insert Flywheel R Cam Gear Gear Y Insert Flywheel N Pulley Reverse Clutch Assy Motor Pulley Gear REEL T side Idler Gear A T side Insert Flywheel R Cam Gear Gear Y Gear FR FF Left side Insert Flywheel N Pulley Reverse Clutch Assy Motor Pulley Gear REEL S side Idler Gear A S side Insert Flywheel ...

Page 5: ... 5 SECTION 2 GENERAL This section is extracted from instruction manual ...

Page 6: ...embly Cassette lid assembly Reel ornament assembly Set Belt F2 Holder assembly Main board Magnetic head HP901 Pinch lever N R assembly Motor F2 M901 Claw 1 Battery case Lid 5 Remove the case block assembly in the direction of the arrow 4 Two screws M1 4 2 5 2 Screw M1 4 2 5 3 Two screws M1 4 2 5 knob HOLD S707 Note When assembling the case block assembly align the knob HOLD with the position of S7...

Page 7: ...nger solenoid 1 Remove soldering six points from the head flexible boards Claw Head flexible board 2 Remove soldering four points from the leaf switch 4 Remove soldering four points from motor 5 Two screws M1 4 6 Screw M1 4 7 MAIN board Note Be careful of the claw SLIDER S701 Note When assembling the MAIN board align the slider with the position of S701 ...

Page 8: ... 9 3 4 MOTOR F2 M901 3 5 CASSETTE LID ASSEMBLY 2 Two screws M1 4 2 1 Screw M1 4 2 5 Cassette Lid Assembly 3 Open the cassette lid 4 Shaft 1 Two screws M1 4 2 Motor F2 M901 ...

Page 9: ...ng from six head flexible boards 2 Shaft 6 Shaft 9 Remove the holder assembly in the direction of the arrow 7 Cassette Bracket Assembly 5 Lock Lever S 4 Screw Toothed Lock M1 4 1 Reel Ornamene Assembly Note Remove the assembly while removing the 5 claws and the boss carefully Claw Boss Claw Claw Claw Claw ...

Page 10: ... pinch lever R assembly in the direction of the arrow Note Be careful of the claw 2 Remove the pinch lever N assembly in the direction of the arrow Note Be careful of the claw Claw Claw 1 Remove the magnetic head HP901 in the direction of the arrow Note Be careful of the claw ...

Page 11: ...ayback head with a head demagnetizer 3 Do not use a magnetized screwdriver for the adjustments 4 After the adjustments apply suitable locking compound to the parts adjusted 5 The adjustments should be performed with the rated power supply voltage unless otherwise noted Torque Measurement Mode FWD FWD Back Tension REW REW Back Tension FF REW Torque Meter CQ 102D CQ 102D CQ 102C CQ 102C CQ 201B Mete...

Page 12: ...0 BST SW 43 AGC IN 35 BEEP 39 28 32 33 AMS IN 12 4 5 7 8 46 44 CTL F R 9 CASSETTE SW 5 REV SW 4 CENTER SW 3 FWD SW 2 CTL DOLBY 1 AVLS CTL 38 MEGA BASS CTL 8 AMS IN 39 BOOST CTL 10 REVIVE CTL SPEED CTL 7 44 MOTOR CTL 45 STOP 1 SET 13 BEEP 36 MT SW 41 MUTE CTL 12 PW SW 42 AMP CTL 11 DATA RMUM 6 KEY IN 16 1 5 S901 1 TAPE DETECT 14 VCC 13 B SWITCH Q305 FWD STOP REV OFF HOLD D703 BATT IN PHOTO 37 PHOTO...

Page 13: ...justment for repair Power voltage is dc 1 5V and fed with regulated dc power supply from battery terminal no mark PB Waveforms are taken with a oscilloscope Voltage variations may be noted due to normal produc tion tolerances Signal path E PB Abbreviation FR French EE East European Note The components identified by mark or dotted line with mark are critical for safety Replace only with part number...

Page 14: ...o 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 I O O I I I I I O O O O O O O I I I I O O O O I I I O I O I O Pin Name CTL DOLBY FWD SW CENTER SW REV SW CASSETTE SW DATA RMUM REVIVE CTL MEGA BASS CTL F R CTL BOOST CTL AMP CTL MUTE CTL SET STOP1 SET STOP2 BATT DET KEY IN PM CTL PHOTO CTL LED BATT LED DOLBY VDD1 VSS VDD VDDH CB1 CB2 VDDL XT0...

Page 15: ...WASHER 63 3 029 306 11 FLYWHEEL N INSERT 64 3 029 280 01 BELT F2 65 3 029 268 11 FLYWHEEL R INSERT 66 3 007 428 01 WASHER R 67 3 029 765 01 SCREW M1 4 TOOTHED LOCK 68 3 029 274 01 RETAINER F2 MOTOR 69 3 007 433 01 SHEET N REFLECTION 70 X 3377 037 1 CHASSIS ASSY F M 71 3 010 274 02 TABLE REEL 72 3 010 954 01 SPRING BT COMPRESSION 73 3 029 282 01 GEAR Y 74 3 029 285 01 GEAR CAM 75 3 029 284 01 LEVER...

Page 16: ...0 22uF 10 10V C308 1 165 112 11 CERAMIC CHIP 0 33uF 16V C309 1 115 467 11 CERAMIC CHIP 0 22uF 10 10V C310 1 135 149 21 TANTALUM CHIP 2 2uF 20 10V C311 1 164 156 11 CERAMIC CHIP 0 1uF 25V C312 1 115 156 11 CERAMIC CHIP 1uF 10V C313 1 109 935 11 TANTAL CHIP 4 7uF 20 4V C314 1 135 187 21 TANTAL CHIP 2 2uF 20 4V C315 1 135 187 21 TANTAL CHIP 2 2uF 20 4V C316 1 125 837 91 CERAMIC CHIP 1uF 10 6 3V C317 ...

Page 17: ...K 5 1 16W FR R213 1 216 853 11 METAL CHIP 470K 5 1 16W R250 1 216 813 11 METAL CHIP 220 5 1 16W FR R301 1 218 887 11 RES CHIP 47K 0 50 1 16W R302 1 216 849 11 METAL CHIP 220K 5 1 16W R303 1 216 833 11 METAL CHIP 10K 5 1 16W R304 1 216 835 11 METAL CHIP 15K 5 1 16W R305 1 216 837 11 METAL CHIP 22K 5 1 16W R306 1 216 793 11 RES CHIP 4 7 5 1 16W R307 1 216 825 11 METAL CHIP 2 2K 5 1 16W R308 1 216 85...

Page 18: ...OID PLUNGER WM EX678 Sony Corporation Personal A V Products Company 99A1651 1 Printed in Singapore 1999 1 Published by Quality Engineering Dept Shibaura 9 926 931 11 ACCESSORIES 1 418 021 11 REMOTE CONTROL UNIT RM WME21 1 528 252 21 BATTERY CHARGER BC 7S UK 1 528 543 22 BATTERY NI CD NC 6WM 1 528 744 23 BATTERY CHARGER BC 7DY AEP FR EE 1 759 700 21 CASE BATTERY 3 008 521 01 CASE BATTERY CHARGE 3 0...

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