Toshiba 20AR20, Service Manual

1

20AR20/30

COLOR TELEVISION

Chassis No. SN-70A

In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its
original condition and only parts identical to those specified should be used.

 ELECTRICAL SPECIFICATIONS ......................................................................................................... 1

IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................ 2

 LOCATION OF USER'S CONTROL .................................................................................................... 4
 INSTALLATION AND SERVICE INSTRUCTIONS ............................................................................... 5
 CHASSIS LAYOUT .............................................................................................................................11
 BLOCK DIAGRAM ............................................................................................................................. 13
 SCHEMATIC DIAGRAMS .................................................................................................................. 15
 PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 22

REPLACEMENT PARTS LIST ........................................................................................................... 25

 PACKING OF THE SET ..................................................................................................................... 31

Page

CONTENTS

ELECTRICAL SPECIFICATIONS

Specifications  are  subject  to  change  without
prior notice.

SERVICE MANUAL

   20AR20/30

MODELS

    20AR30

    20AR20

POWER INPUT ......................................... 110-220 V AC 50/60 Hz
POWER RATING

20AR20....

............................................................................. 88 W

20AR30................................................................................. 98 W

PICTURE SIZE ........................................... 1,194cm

2

 (185sq inch)

CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION ..................................................... Magnetic
FOCUS .............................................................. QPF Electrostatic
INTERMEDIATE FREQUENCIES

Picture IF Carrier Frequency ..................................... 45.75 MHz
Sound IF Carrier Frequency ...................................... 41.25 MHz
Color Sub-Carrier Frequency ..................................... 42.17 MHz

 (Nominal)

AUDIO POWER

OUTPUT RATING
  20AR20................................................ 1.3W (at 10% distortion)
  20AR30................................................ 2.5W (at 10% distortion)

SPEAKER

SIZE ........................................................................ 9 cm x  5 cm
VOICE COIL IMPEDANCE
    20AR20........................................................... 8 ohm at 400 Hz
    20AR30......................................................... 16 ohm at 400 Hz

ANTENNA INPUT IMPEDANCE

VHF/UHF .................................................... 75 ohm Unbalanced

TUNING RANGES

VHF-Channels .............................................................. 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels .......................................................... 1 thru 125

1