Sony WM-23 - Service Manual

® WM-11D
US Model
© WM-23
_ AEP Model
~ E Model
STEED GRAEBETIE PLA
PHOTO: US model ;
SPECIFICATIONS | _ PARTS IDENTIFICATION
@ <4 FF (fast forward) button @ me REW (rewind) button
© <4 PLAY (playback) button @ STOP/EJECT button @ Battery
indicator @ TAPE selector @ PHONES (headphones) jack
© VOL (volume) contro! @ DC IN 3V (external power input) jack
Tape track: 4-track 2-channel stereo
Fast winding time: Approx. 2 min. with Sony cassette CHF-60
Frequency response
40-15,000 Hz (with the TAPE selector set to METAL/CrO,)
40- 15,000 Hz (with the TAPE selector set to NORM) aa y.@ aeeotleccompariment:@ battery compariment
Power output eae .
20 mW + 20 mW (at 10% harmonic distortion) at dc operation
Power requirements: 3 V dc
two size AA batteries (IEC designation R6)
External batteries (used in the optional EBP-500 battery case): two
size D batteries, (IEC designation R 20)
DC IN 3 V jack accepts: 1 ;
optional Sony AC-39 ac power adaptor for use on 120 V ac, 60 Hz,
optional Sony DCC-70 car battery cord for use on 12 V car battery
Battery life (continuous playback hours):
Approx. 3 hours with Eveready No. 1215 Heavy Duty batteries
Approx. 5 hours with Eveready No. E91 Alkaline batteries
For maximum performance we recommend the use of alkaline
batteries. | :
Dimensions: Approx. 132 x 84.7 x 31.4 mm (wihid) -
| (54, x 3%, x 14, inches)
not incl. projecting parts and controls
Weight:
Approx. 230 g (8.2 0z) not inci. batteries and other accessories
Approx. 270 g (9.6 02} incl. batteries, not incl. other accessories
Tape Transport Mechanism Type MT-WM23-06
STEREO CASSETTE-PLAYER
ot
SONY,
1 TC

Sony WM-23 Specifications

General

Type	Cassette Player
Brand	Sony
Model	WM-23
Signal-to-Noise Ratio	50 dB
Power Supply	2 x AA batteries
Color	Silver, Black
Wow and Flutter	0.15% (WRMS)

Summary

Specifications

Servicing Notes

Repairing Printed Resistor

Replacing Chip Components

Guides on replacing surface-mount electronic components.

Precautions for Component Replacement

Removing Chip Components

Connecting Chip Components

Section 1: Disassembly

Rear Cabinet Removal

Details the procedure for removing the rear cabinet of the device.

Disassembly Procedures

Cassette Lid Removal

Explains how to detach the cassette lid from the player.

Mechanism Block Removal

Details the procedure for removing the main mechanism block.

Audio Board Removal

Guides on how to remove the audio circuit board.

Section 2: Adjustments and Measurement

Mechanical Adjustments and Measurement

Details mechanical calibration and measurement procedures for optimal performance.

Precautions for Adjustment

Torque Measurement

Tape Tension Measurement

Head Height Adjustment

Explains how to adjust the playback head height for optimal sound.

Electrical Adjustments

Covers calibration and adjustment procedures for electrical components.

Playback Head Azimuth Adjustment

Details the procedure for aligning the playback head azimuth.

Tape Speed Adjustment

Explains how to adjust the tape playback speed.

Phase Check

Schematic Diagram (Audio Board)

Section 4: Exploded Views and Parts List

Exploded Views (Mechanical Components)

Illustrates the assembly of mechanical parts with numerical references.

Parts List (Mechanical Components)

Provides a detailed list of mechanical part numbers and descriptions.

Exploded View (Mechanism Parts)

Parts List (Mechanism Parts)

Exploded View (Mechanical Linkages)

Parts List (Mechanical Linkages)

Section 5: Electrical Parts List

Capacitors

Resistors

Semiconductors

Integrated Circuits (ICs)

Other Electrical Components