Sony WALKMAN WM-F31 - User Manual

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Service
Manual
issued
previously
SERVICE
MANUAL
for
information
of
speaker
system
supplied
with
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WM-F
41SS.
WM-F31
Function
selector
UK
Model
() (headphones)
VOLUME control
jack
(stereo
minijack)
cnet
TUNING
knob
a
——
=
Dial
scale
E
Model
AEP
Model
FM sensitivity/
WM-F41
tape selector |
DC IN 3V US Model
m@ (stop) button —__—s | i
i (external power input)
& (rewind) button
jack (right side) Canadian Model
y ie forward) WM-F41SS
: ema eien: Canadian Model
| | compartment (rear)
Vv
(playback)
a
|
——e_
:
button
‘a
|
A
K
1
PHOTO: WM-F41
SPECIFICATIONS
Similar
Mechanism
Model
|
WM
-
31/31SS/41
Frequency range FM: 87.6-—108 MHz
AM:
530-1,605
kHz
a
Antennas FM: Headphone cord antenna =
AM: Built-in ferrite rod antenna
Frequency response
40-14,000 Hz (with the tape selector set to
CrO,/METAL)
40-14,000 Hz (with the tape selector set to NORMAL)
Power output 15SmW + 15mW at DC operation
(at 10% harmonic distortion) load impedance
320hms
Power requirements
3V DC, two size AA (IEC designation R6) batteries
External batteries (used in the optional EBP-500
battery case): two size D (1EC designation R20)
batteries
oN DC IN 3V jack accepts:
Sony AC-D2 AC power adaptor (optional)
Sony DCC-70 car battery cord (optional)
Battery life (nours)
FM Tape
reception playback
Batteries
Sony SUM-3(NS) New Super or
Eveready No. 1015 Heavy
Duty batteries
Approx. Approx.
17 4.5
Sony Eveready AM3 alkaline
or Eveready No. E91
alkaline batteries
Approx. Approx.
35 9
For maximum performance we recommend the use of alkaline batteries.
Dimensions Approx. 88.1 «132 «34mm (w/h/d)
(34/,x5,«x14¥, inches)
not incl. projecting parts and controls
Weight Approx. 240g (8.502) incl. batteries, not incl. other
aan
FM/AM
STEREO
CASSETTE
PLAYER
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MICROFILM

Sony WALKMAN WM-F31 Specifications

General

Brand	Sony
Model	WALKMAN WM-F31
Category	Cassette Player
Language	English

Summary

SECTION 1 DISASSEMBLY

CASSETTE HOLDER AND CABINET REMOVAL

Procedures for removing the cassette holder and rear cabinet components.

CIRCUIT BOARD AND MECHANISM REMOVAL

Steps to detach the circuit board and transport mechanism.

POINTER SETTING PROCEDURE

Instructions for correct pointer installation and tuning belt placement.

SECTION 2 ADJUSTMENTS

MECHANICAL ADJUSTMENTS

Procedures for torque, tape tension, and general maintenance adjustments.

ELECTRICAL ADJUSTMENTS - CASSETTE SECTION

Adjusting tape speed and playback head azimuth for optimal performance.

ELECTRICAL ADJUSTMENTS - FM SECTION

Tuning FM signals, adjusting VCO, and signal strength.

ELECTRICAL ADJUSTMENTS - AM SECTION

Aligning AM frequency coverage, tracking, and IF stages.

SECTION 3 DIAGRAMS

MOUNTING DIAGRAM

Component layout on the main board (conductor side).

SCHEMATIC DIAGRAM

Detailed circuit schematic for main and audio boards.

SECTION 4 EXPLODED VIEW

SECTION 5 ELECTRICAL PARTS LIST

ELECTRICAL PARTS LIST

Comprehensive list of electronic components with part numbers.

ACCESSORY & PACKING MATERIAL

List of included accessories and packing materials.