Sony wm f 2078 service manual

Page 1

SERVICE MANUAL

US Model

Canadian Model

AEP Model
UK Model
E Model

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Radio section
Frequency range FM: 875-105 MHz
AM: US. Canadian. E model:
530-l.710 kHz (10 kHz step)
AEP. UK model:
531 -1.602 kHz (9 kHz step)
Antennas FM: Headphone cord antenna
AM: Built-in ferrite bar antenna

Tape player section
Frequency response (Dolby NFt all)

30 - 15,000 Hz

Power output 10 mW + 10 mW, 16 ohms at DC
operation

Output Headphones (stereo minijack): load

impedance 3 - 300 ohms
Power requirements
3 V DC. two H6 (size AA) batteries
DC W 3 V jack accepts:
Optional Sony EBP-SOOB battery
case ior use with R20 (size D)
batteries
Optional Sony AC-DZM AC power
adaptor
US. Canadian model:
120 V AC, 60 Hz
UK model:
240 V AC. 50 HZ
AEP model:
220 V AC, 50 Hz
E model :
120 V AC. 60 Hz or 220 V AC
50 Hz
Optional Sony DOC-70 car battery
cord lor use with 12 V car battery

Model Name Using Similar Mechanism WM-AF23/BF23

MF- WMF2078- 19

Tape Transport Mechanism Type

SPECIFICATIONS

Battery life Approx. 6 hours of tape playback
and approx. 16 hours oi FM
reception. using Sony alkaline
batteries AMa (N)

Dimensions Approx. 97 x 119 x 43 mm (wlh/d)
not incl. projecting parts and
controls

Weight Approx. 330 9, incl. batteries

Accessories supplied

Belt clip (1)

Canadian, European and UK model:
Stereo headphones (open-air type. 1)
Other model: Stereo earphones
(open-air type, 1)

Design and specifications subject to change without
notice.

Note: If an AC power adaptor or a car battery card not
manufactured by Sony is used, a iuse must be installed
in the AC power adaptor or the car battery cord and the
polarity oi the plug must be as illustrated.

9523/

RADIO CASSETTE PLAYER
SONY;

Page 2

WM - F2078

TABLE OF CONTENTS

m m EEK:
Specifications ......................................... 1
1' GENERAL ......................................... 3
2' NOTE ON REPAIR ................................. 6
3. DISASSEMBLY ..................................... 7

4. ADJUSTMENTS

4- 1. Mechanical Adjustments ------------------- a

4-2. Electrical Adjustments --------------------- 8
5. DIAGRAMS

5-]. 1C Block Diagram ......................... 11

5-2, Primed Wiring Board ...................... 12

5-3. Schematic Diagram -Main Section- ----- 15

5-4. Schematic Diagram -Display Section-m- 18
3_ ExpLopEp VIEWS ............................... 20
7. ELECTRICAL PARTS LIST ----------------------- 23

Notes on chIp component replacement

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

FIexlbIe CIrcult Board Repairlng

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

0 Do not touch the soldering iron on the same conductor
of the circuit board (within 3 times).

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

WARNING !!

ADVARSELI
Lithiumbaiteri-Eksplosionsfare
Udskiftning m5 kun foretages
af en sagkyndig, 0g som
beskrevet i servicemanualen.

LITHIUM BATTERY

SHOULD ONLY BE CHANGED BY TECHNICAL
PERSONNEL THERE IS A RISK FOR EXPLOSION
AT A WRONG HANDLING.

Batteriet mfi kun udskiftes med et batteri af samme
iabrikat og type".

Because of the risk for eXplosion the battery must
be replaced with the same type and manufacture.