Motorola bl 712 c service manual

Page 2

TABLE OF CONTENTS

Description Page
CHASSIS ALIGNMENT PROCEDURE . . . . . . . . . . . . . . 13, 14
CHASSISPARTSLOCATION».....:., .....V...8,9,10
CHASSISSCHEMATICDIAGRAM . 37,38

GENERAL INFORMATION REPLACEMENTPARTSLIST 31
SERVICENOTES.................................. 3,4

The receivers in this manual em- TRANSISTOR SPECIFICATIONS 5
ploy ahorizontally mounted chassis ' ' ' ' ' ' ' ' ' ' ' . - - - - ~ -
containing an ll-transistor etched TUBE AND TRANSISTOR LOCATION , , . . , , , _ . , _ , _ _ . . _ . . . . 5
ward sub'Cha55s 9 wt :3 UHF TUNER ALIGNMENT (HTT-623) . . . . . . . . . . . . . . . . . . . . . 27
mounted the small-signal clrcuxts,

These include the Video and audio UHF TUNER ALIGNMENT (PITT-624) . . . . . . . . I . . . . . . . . . . . . 29
IF amplifiers, me" mplfer" UHF TUNER ALIGNMENT (PITT-627) . . . . . . . . . . . . . . . . . . . . . 27

sync, AGC and noise gate circuits.

UHF TUNER REPLACEMENT PARTS LIST (HTT-ézs) . . . . . . . . . . 35

The chassis also has 8 tubes em. UHF TUNER REPLACEMENT PARTS LIST (HTT-624) . . . . . . 36

Plovefi in. the sweep and and Out' UHF TUNER REPLACEMENT PARTS LIST (PITT-627) . . . . . . . . 35

put cucmts and the VHF tuner, The

UHF tuner is transistorized UHF TUNER SCHEMATIC DIAGRAM (PITT-623 $1 PITT-62.7) . . . . . . 28
UHF TUNER SCHEMATIC DIAGRAM (PITT-624) . . . . . . . . . . . . 30

The diode complement consists of VHF TUNER ALIGNMENT (OPTT-396Y) . . . . . . . . . . . . . . 16, 17. 18

10 diodes and 2 Silicon power recti-

fiers on the chassis plus 1 diode in VHF TUNER ALIGNMENT (OPTTJOM ' ' ' ' ' ' ' ' ' ' ' ' ' 22' 23 24

the UHF tuner. VHF TUNER REPLACEMENT PARTS LIST (OPTT-396Y) . . . . . . 34, 35

VHF TUNER REPLACEMENT PARTS LIST (OPTT-404) . . . . . . . . . 35
VHF TUNER SCHEMATIC DIAGRAM (OPTT-396Y) . . . . . . . . . . V . l9
VHF TUNER SCHEMATIC DIAGRAM (OPTT-404) . . . . . . . . . . . . . 25

MODEL BREAKDOWN CHART

VHF UHF
MODEL CHASSIS TUNER TUNER CRT
BT601CE, CH JTS-594 OPTT-396 PITT-623* 21FZP4 or 21va4
BT602CE,CN ITS-594 OPTT-396 PITT-623* 21Ez1=4 or 21va4
BT603CH, CS, CW JTS-594 OPTT-396 PITT-623* ZlFZP4 or 21FVP4
BT7OICE,CN 22TS-594 OPTT-396 PITT-624 23ESP4, 23GXP4,
0r or or Z3HLP4 or 23GSP4
szTS-594 OPTT-4o4 HTT-627
BT702CW 22TS-594 OPTT-396 PITT-624 23FSP4, 23GXP4, ELECTR'CAL SPEC'F'CATIONS
or or or Z3HLP4 or 23GSF4 . .
szTS-594 OPTT-404 HTT~627 PM Rating" 145 watts
BU704CW ZZTS-594 OPTT-396 HTT-624 Z3FSP4, 236x134, Source: 120 volts, 60 cycle AC
1 or or or Z3HLP4 or 23GSP4
% CZZTS-594 own-404 HTT-627 INTERMEDIATE FREQUENCIES
5 BU705CS 22Ts-594 OPTT-396 HTT-624 23FSP4, 23GXP4 IF: Video 45.75Mc
; or or or 23HLP4 or 2365134 Sound 41 ZSMC
. cans-594 OPTT-4o4 PITT-627 '
BU706CM HTS-594 OPTT-396 HTT-624 23ESP4,23GXP4, Sound LF: 4.5Mc
01 or or 23HLP4 or Z3GSP4
cans-594 OPTT-404 PITT-627
BU707CF HTS-594 OPTT-396 HTT-624 Z3FSP4, 23GXP4,
or or or Z3HLP4 or 2305134
Q szTS-594 OPTT-404 PITT-627 CAUTION
3 BU709CM,CW 22135-594 OPTT-396 HTT-624 23E5P4, 23GXP4, ,
' 01 or or 23HLP4 or 23GSP4 NO WORK SHOULD BE ATTEMPT-
czsz-594 OPTT-404 HTT-627 ED ON AN EXPOSED TELEVISION
ANYONE NOT FAMI-
BS710CM.CW ans-594 OPTT-396 HTT-6z4 23FSP4, 23GXP4, CHASSIS BY
or or or BEL or 2365 LIAR WITH SERVICING PROCE-
szTs-594 OPTT-404 HTT-627 DUKES AND PRECAUTFONS-
BS711CS zsz-594 OPTT-396 HTT~624 Z3FSP4,Z3GXP4
01 or or 23HLP4 or ZSGSP4
C22TS-594 OPTT-404 PITT-627
i BL7lZCM, CW 22Ts-594 OPTT-396 HTT-624 23FSP4, 23GXP4,
01' or or 23HLP4 or Z3GSP4
C22TS-594 OPTT-404 PITT-627

2 *HTT-624 or PITT-627 used in some models.