Sony wm af 42 service manual

Page 1

WM-AF42/BF4Z

SERVICE MANUAL '* *

US Model
Canadian Model

WM-A F42
E Model
WM-BF42
wartime
Photo: WM-B F42
SPECIFICATIONS
Rid cm" Model Name Using Similar Mechanism WM-FGQ
Frequency range
FM: 87.6-108MHz Tape Transport Mechanism Type M FWM F3980
AM: 530-1.605I Tape player section and general
Frequency response (DOLBY NR aft)
40% 5,000 Hz Optional accessories
Power output (headphones) Ac power adaptor AC~DZL
WM-AF42 Battery case EBPéOOB
12mW+12mW load impedance 329 at DC operation Car battery cord DOC-70
Power requirements Battery charger 50-700
3V DC Rechargeable battery BP-700
Two size AA (R6) batteries
Sony rechargeable battery Note: Use only the recommended AC power adaptor or car
DC IN 3V jack accepts: battery cord manufactured by Sony. Polarity of the plug of
Sony AODZL AC power adaptor for use an \ other manufacturers may be different
120V AC, 60 Hz
Battery llle .
Approx. 7 hours for tape playback 7
Approx. 30 hours for FM reception
Using Sony alkaline batteries AM3 (N)
Dimensions
WM-AF42 Polarity of the Sony plug

Approx. 93t1><1333><3841 mm (wlhld)

incl. projecting parts and controls
Weight

WM-AF42

Approx 2659 incl.batterles
Accessories supplied

Stereo headphones (open-air type, 1)

Belt clip (0

CASSETTE PLAYER
ONE

Page 2

WM -AF42/ B F42

SERVICING NOTE

Flexible Circuit Board Repairing

Keep the temperature of the soldering iron around
270°C during repairing.

Do not touch the soldering iron on the same con-
ductor of the circuit board (within 3 times)

Be careful not to apply force on the conductor
when soldering or unsoldering.

Notes on chip component replacement

Never reuse a disconnected chip component.
Notice that the minus side of a tantalum capacitor
may be damaged by heat.

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SECTION 1
GENERAL

FUNCTION OF CONTROLS

TAPE selector

WM-AF42 (AM, FM LOCAL, FM DX)
WM-BF42 (AM, FM MONO, FM ST)

O (headphones) jack
4 VOLUME knob

TAPE/RADIO selector

I STOP buttton

4d!» (fast-windinglbutton DC IN 3V (external power Input) pack
4 (playback) button

<|> DIR (tape transport
direction change) button

MODE (tape
transport mode) selector

Battery compartment (rear)