Motorola et 742 en service manual

Page 1

television MANUAL 68P65130A10
SUPPLEMENT No. 1

S- E VICE MANUAL. -
T° 2:153 42...... CHASSIS 22TS 613
MODEL ET742EN

mow-anon M service manual

GENERAL
INFORMATION

{- This supplement introduces a new
model using the 22TS-613 chassis.
With the exceptions listed below this
chassis is identical to the 22TS-6IO
chassis.

i

This model contains a three position
slide switch located on the rear
function panel for video switching.
Also, a video input bias control for
adjustment of white limiting is
provided for external video inputs. In
addition this chassis contains transistor
sockets for ease of servicing.

SUPPLEMENT NO. 1
TO 221'34610 SERVICE MANUAL,

PART NO. 68P65130A09

Complete schematic diagram and parts Mada/ E77425

list pertaining to this model is
; incorporated in this supplement. For
' all other information, refer to the

original 22TS-610 service manual.

A 8 M Z
< E K -
3&5 EXTERNAL VIDEO BIAS
In N m ADJUSTMENT (located at rear of
ID
. g 3 3 function panel) REQUIREMENTS: MODEL BREAKDOWN CHART
.' <7: '3
_I u, o
; g g 5 1. One volt PP of video needed to VHF UHF
g 0 video inputjack. MODEL CHASSIS TUNER TUNER CRT
2- 36, PM? Optimizer contm' *0 ET742EN 22TS-613 DOPTT-411 KTT-622 23JEP4
ClockWIse posmon. or
. . . KTT-626
3. Adjust external VIdeo bIas control

until no evidence of white limiting is
present.

television

CAUTION

NO WORK SHOULD BE ATTEMPTED ON AN EXPOSED TELEVISlON CHASSIS BY
ANYONE NOT FAMILIAR WITH SERVICING PROCEDURES AND PRECAUTIONS.

MOTOROLA INC. 9401 WEST G RAND AVENU E, FRAN KLI N PARK. ILLINOIS
PART No. seess1soA10 1-69 PRICE 35 CENTS PRINTED IN USA

Page 2

Position ' In ' (as shown) connects
audio from receiver to internal
speaker.

Position "Ext connects audio
from receiver to external speaker
jack and external amplifier jack.
Disconnects internal speaker,

Position Both" connects audio
from receiver to internal speaker,
external amplifier jack and external
speaker jack.

EXTERNAL SPEAKER JACK

Provides connection for additional
speakers.

VIDEO INPUT JACK

Provides connection for closed cir-
cuit reception, video tape recorder
or video camera.

Pos. 1 For normal operation (airv
signal).

Pos. 2 For video input to set.

Pos. 3 To bridge video (0 other
SETS.

Note: Last set using video must be
terminated 75 ohms (P05. 2).

75 OHM VHF ANTENNA CON
/ NEOTION

~ Selects either 75 Ohm or 300 Ohm

H§//antenna inputs to the VHF tuner,
300 g 75 Switch shown in 300 Ohm position.
300 OHM VHF ANTENNA CON-
NECTION

--300 OHM UHF ANTENNA CON-
NECTION

EXTERNAL AMPLIFIER JACK

IN 5x1 BOTH
SPEAKER SELECTOR Provides connection for tape re-

corder or amplifier speaker systems.

/

VIDEO OUTPUT JACK
' /Provides video for additional sets.

VIDEGIMPUT .
TERMINATED 4
1 75m
RFINPUT-r
(NORMAL)

z a d-VIDED
INPUT
ERIDGED

ANTENNA/ACCESSORY FUNCTION PANEL - PANEL LOCATED ON REAR OF SET -
PROVIDES CONNECTOR POINTS FOR ANTENNAS AND ACCESSORY EQUIPMENT

PIJ' A16 on azv A29 AIU P'¢;;J"E§4TUBE
An EL" :31 '1; 1 8° 1250:5232: M4842 m fig; AMP mm: mg was me As ummmm m saw
no 5m: W DELAY AN. AGc AMP 2ND IF AMP NoIsE GAYE GREEN 5503
I AIM A? "W23? 32%; .
iLLUSTRATED unfit-11w 9m; soum nan */
TRANSISTO _
BLOCK DIAGRAM ,5'95' LINGERING
/ SPOT KILLER 018
Aim-'4
use 0 0°25 jzoumn noniz
aCOLL. C I-i
.1 JJéo 5.5!;
_' |
ML 2501 our, LIMITER
I Ounce on
A2T \5 158\ My
TRAP
AIR TV SET '22:»? 02 Cam \L
SIGNAL P03. 1 C {It E DISCHARGE I \ //
-' IV0- H mm Dzr Inc 2 Bela:
E 4 028 / vam- NEHIRGEI Isr 4.5m: AM Ami 2+ new moon M" 2 W-
4.5m J AIv up. 0 ASP
TAPE OR 75 OHM 027 NTERSTAGE srnc SE! tenet-n» Noni: use
A": A, WGEWUA730
CAME RA VERY vear
VIDEO OUTPUT DRIVER
I N P UT T . L . D I
JACK
TAPE OR 75 OHM ram/star ocatmn eta!
TV SET TV SET
CAMERA P03 3 P08 3
VIDEO .I I

VIDEO

lNFUT INPUT

JACK VIDEO JACK VIDEO
OUTPUT OUTPUT
JACK JACK

VIDEO

INPUT VIDEO

JACK OUTPUT
JACK

(NOT USED)

2