Sony tc k 420 service manual

Page 1

SERVICE MANUAL

AEP Model
UK Model
Australian Model

SPECIFICATIONS

Recording system
4-track 2~channe| stereo
Bias AC bias
Motors Capstan motorxt (DC servo motor)
Reel motorx1 (DC motor)
0.07% WRMS (NAB)
10.18% (DIN)
Fast winding time
Approx 90 sec. (with 0-60 cassette)
Frequency response (DOLBY NFl OFF)

Wow and flutter

Model Name Using Similar Mechanism

TC-K510

Tape Transport Mechanism Type

TCMCMAY 328

TYPE IV cassette
(Sony METAL-ES)

3048.000 Hz (1'3 dB, DIN)
30-15,000 Hz (OVU recording, :3 dB)

TYPE ll cassette

30-17,ooo Hz (:3 dB, DIN)

(Sony UX-S)

TVPE l cassette
(Sony HF-S)

30-15900 Hz (:3 dB, DIN)

Signalto-noise radio (NAB, at peak level)

Dolby NR switch B~TYPE C-TYPE

Cassette OFF ON ON

TYPE IV (Sony METAL-ES) 59 dB 57 dB 74 dB
TYPE II (Sony UX-S) 58 dB 66 dB 73 dB
TYPE | (Sony HF-S) 56 dB 64 dB 71 dB

Total harmonic distortion
10% (with Sony METAL-ES cassettes)
Inputs

Line inputs Sensitivity 77.5 mV (-20 dB)

(phono JackS) 50k ohms

Input impedance

Outputs

Line outputs
(phono jacks)

Rated output level 0.44 V (-5 dB) at a load

impedance of 47k ohms
Over 10k ohms

Load impedance

Headphones Output level 0.3 mW at a load
(stereo impedance of 32 ohms
phone jack

General

Power requirements

220v Ac (or 240v AC), 50/60 Hz
Power consumption

16W

Dimensions Approx. 430><123><285mm (w/h/d)
(17 X47/a X11 4 inches)
including projecting parts and controls
Weight Approx. 4.1 kg (9 lbs 1 oz)

Supplied accessory
Audio connecting cord (2)

Design and specifications subject to change without notice,

Optional accessory
Wireless remote control unit RM-QOOW.
Wireless remote control unit RMJ701.
Note
This appliance conforms with EEC Directive B7/308/EEC
regarding interference suppression.

STEREfl CASSETTE DECK
SONYZ

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TC-K420

- FEATURES

0 A bias. control for adjusting the bias current for
optimum recording on every tape.

0 The Dolby HX PRO* system to improve the linearity
of the tapes highrange response during recording.

- The AMS to provide easy access to a desired selection

0 An optional remote control unit to allow various
operations to be remotely controlled.

* Dolby noise reduction and HX PRO headroom extension
manufactured under license from Dolby Laboratories
Licensing Corporation. HX PRO originated by Bang &
Olufsen.

DOLBY, the double-D symbol III and HX PRO" are
trademarks of Dolby Laboratories Licensing Corporation.

MODEL IDENTIFICATION
-Specification Label Printed on Back Panel-

SONY®

STSREO CASSETTE DECK

MODEL NO. T040120

m

\
§
§

AEP model : AC 220V~50/60Hz
UK/Austrarian model : AC 240V~50/60Hz

Section Title Page
Specifications ................................................................. 1
Featureg ........................................................................ 2
1 , GE N ERAL

1-1.1dentitication of Front Panel Parts ~~~~~

2. MECHANICAL ADJUSTMENTS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3
3. ELECTRICAL ADJUSTMENTS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 3
4. DIAGRAM

4-1. Semiconductor Lead Layouts
42. Printed Wiring Boards"

43. Schematic Diagram~ -11
5. EXPLODED VIEWS ............................................... 15
6 ELECTRICAL PARTS LIST ................................... 19

SECTION 1
GENERAL

1-1, IDENTIFICATION OF FRONT PANEL PARTS
14 3 12 1

4

POWER switch

TIMER switch

3]Remote control sensor

You can control this unit remotely with:

- A remote commander that came with a Sony
amplilier or receiver it it has the E mark and
cassette deck control capability.

- Any optional Sony remote commander with the
mark.

[Z12 (eject) button

5 Cassette holder
(-3- Tape operation buttons and indicators
« (rewind) button
I (stop) button
I> (play) button and indicator
» (fast forward) button
0 REC (record) button and indicator
ll PAUSE button and indicator
0 FIEC MUTE (record muting) button
BIAS (bias adjust) control
HEADPHONES (headphones) jack (stereo phone
jack)
I5 I REC LEVEL (recording level) control
[i_o]MPX FILTER switch
DOLBY NR switch
12 TAPE TYPE indicators
i3 PEAK LEVEL METER
1_4jTAPE COUNTER and RESET button