Sony cfs 1140 service manual

Page 1

CFS-i 140

SERVICE MANUAL

US Model

Model Name Using Similar Mechanism CPD-58

Tape Transport Mechanism Type MF-1040~102

SPECIFICATIONS

Audio Power Specifications

POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:

With 6 ohm loads, both channels driven,
from 80-10,000 Hz; rated 4.5 watts per
channel minimum RMS power, with no
more than 10% total harmonic distortion
in AC operation

Other Specifications

FM: 875-108 MHz

AM: 5304.710 kHz

FM: Telescopic antenna

AM: Built-in territe bar

Frequency response 100-10,000 Hz

Speakers Two way: tweeter 2 cm ("A5 in.) dia.

woofer 10 cm (4 in.) dia.

impedance: 6 ohms

Inputs Mixing microphone (Mix MlC) input jack
(minijack) (1)
Sensitivity 3 mV for low impedance
microphone
CD/LINE IN Jacks (stereo phone) (2)
Input impedance 47 kilohms
Sensitivity 0.24 V

Outputs Headphones jack (stereo minijack) lor

16-68 ohms impedance headphones

Speaker terminals for supplied 6 ohms

impedance speaker

Frequency range

Antennas

Power requirements 120 V AC, 60 Hz
9 V DC, six size D (R20) batteries
Power consumption 15 W in AC operation

Battery life FM Ta
, pe
Batteries recording playback
Sony Approx. Approxr
SUM-1 (NS) 8 hours 2 hours
Sony AM-1 Approx. Approx
alkaline 18 hours 6 hours
Dimensions Approx 650 x 195 x 190 mm (w/hld)
(25 5/: x 7 it x 7 V: inches)
incl. projecting parts and controls, not
incl. handle
Weight Approx 58 kg (12 lb 13 oz) incli batteries

Accessory supplied AC power cord (1)

Design and specifications subject to change without notice.

RADIOCASSETTE-CORDER
S ONY;

Page 2

CFS-1140

TABLE OF CONTENTS
Section Title
Spacifications r .............................................................. 1
1. GENERAL
Location and FunctiOn of controls ................................ 3
Tape Playback ~~~~~~~~

Listening to the Radio
Recording ...............
Microphone Mixing
Listening to or Recording from Various Sources

(AC/10.54;

2. DISASSEMBLY ~

3. DIAL POINTER INSTLLATION

4. BLOCK DIAGRAM ................................................. 9
5' ADJUSTMENTS ................................................... 11
6. DIAGRAMS

6-1. CirCUit Boards Locationm

6-2. Printed Wiring Boards ~ - 16
6-3. Schematic Diagram . 19
7. EXPLODED VIEWS .............................................. 25
8. ELECTRICAL PARTS LIST ~~~~~~~~~~~~~~~~~~~~~~~~~~~ 29

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC 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 PUB-
LISHED BY SONY.

Page

SAFETY CHECK-OUT

After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:

Check the antenna terminals, metal trim, metallized
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5 mA (500 microampers). Leakage
current can be measured by any one of three
methods.

1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-54OA. Follow the
manUfacturers instructions to use these instru-
ments.

2. A battery~operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.

3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt~
meter. The limit indication is 0.75V, so
analog meters must have an accurate low
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)

To Exposed Metal
Paris on Set

A C
0.1 5 uF voltmeter
(0. 75 VI

L-él 5kg
L- .

11' Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.