Sony cfm 145 tv service manual

Page 1

CFM-145TV

SERVICE MANUAL

US Model

Frequency range

Antenna

Recording system
Frequency response
Speakers

Power output

Output

Power requirements

Model Name Using Similar Mechanism

NEW

Tape Transport Mechanism Type

MF~145

SPECIFICATIONS
TV-H: 7-13 CH Power consumption
TV 2-6 CH Battery life
FM: 87.6-108 MHz
AM: 530-1 .71 0 kHz
FM/T V: Telescopic antenna
AM: Built-in ferrite bar antenna Dimensions

2-track mono

ISO-6.300 Hz

Wooier: 10 cm (4 inches) dia x 1
Tweeter: 2 cm (56 inch) dia x 1

2 W (at 10% harmonic distortion DC
operation)

Earphone jack (mini jack) tor 8-300
ohm impedance earphone

120 V AC, 60 Hz

6 V DC, four size D (R20) batteries

Mass

10WAC

Batteries FM recording

Sony SUM-1 (NS) Approx. 16 hours

Sony AMt (N) alkaline Approx 27 hours

Approx 314 x141 x108 mm (w/h/d)
(12% x 5% x 4% inches)

including projecting pans and controls.

not including handle

Approx 2.0 kg (4 lb 7 02) including

batteries

Design and specifications subject to change without notice

RADIO CASSETTE-BURDER
S ON Y®

Page 2

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 0.5mA (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-540A. Follow the
manufacturers instructions to use these instru-
ments.

2. A batteryoperated AC milliammeterl 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-
meterl The limit" indication is 0.75V, so analog
meters must have an accurate lowvoltage 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
Parts on Set

015uF i-g
' L 1.5kQ

.~_l

5 Earth Ground

AC
voltmeter
(0.75V)

(I

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

SAFETY - RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED BY MARK A OR DOTI'ED
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.

SECTION 1
GENERAL

LOCATION AND FUNCTION OF CONTROLS

I. TAPE OPERATION BUTTONS

0I¥t5=

PPPNQWSPN

.a.

PAUSE

STOP/ EJECT

FF (fast~forward)lCUE
REW (rewind)/REVIEW
PLAY (playback)

REC (record)

MIC ( built-in)

OPR/BATT (operation/battery check) indicator
FUNCTION SELECTOR (Radio/Tape)

BAND SELECTOR (TV-H/TV-L/FM/AM)
TONE control

VOLUME control

EARPHONE

AC |N socket (~AC IN)

TUNING control