Motorola bp 451 c service manual

Page 1

television

MANUAL 68P65135A69

MOTOROLA INC.
PART NO. 68P65135A69

CHASSIS TS-597

MODELS BP451C & BPj452c

MOTOROLA

SUPPLEMENT NO. 3

TO TS-597 SERVICE MANUAL,
PART NO. 68P65I35A66

television

MANUAL 68P65'I35A69

CHASSIS TS-597

MODELS BP4SIC & BP452C

MODEL BP45IC

MODEL BP452 C

GENERAL INF ORVMATI 0N7

This supplement introduces new
receivers added to the line since
the publication of the original TS-597
service manual.

Complete cabinet parts list, chassis

coding changes and UHF tuner ser-
instructions are included in

Vice
thi 5 supplement.
formation,

MODEL BREAKDOWN CHART

For all other in-
refer to the
TS-597 service manual.

original

VHF UHF
MODEL CHASSIS TUNER TUNER CRT
BP451CN CTS-597 CMTT-393Y KTT-éZZ 16CJP4
or
KTT-ézé
BP452CA, NCTS-597 CMTT-393Y KTT-62216CJP4
CE,CL,CN or
KTT-626

3-67

9401 WEST GRAND AVENUE, FRANKLIN PARK, ILLINOIS
PRICE 20 CENTS

COPYRIGHT I967 BY MOTOROLA INC. - PRINTED IN USA

Page 2

CHASSIS CODING CHANGES

Chassis Coding

Chas sis Coding Chang e s

BTS-597A-O4*

BTS-597Av05

BTS«597A-06

BTS-597A-07

HTS-597A-08

BTS-597A-09

BTS-597A- 10

No Code Change

No Code Change

BTS-597A~ ll

BTS-S97A- 12

1 TO REDUCE HORIZONTAL COLLAPSE: Change (3-520 from 150 pf, 20%, ZSF to 100

pf, 20%, ZSF (part number ZISIBOCIB). Change C-SOD from 200 pf, 20%, ZSF to 150 pf,
20%, 25}? (part number 218129730). Change R-508 from 4.7 meg, 10%, i/ZW to 3.3 meg,
10%, 1/2W.

2 RELIABILITY CHANGE: Noise gate transistor, (3- 100, changed from type M4852 to
M4853 (part number 485134853).

3 TUNER CHANGE: Tuner part number 77Dé7325A07 replaced by 77D673ZSBO7 (model
number of toner, CMTT-393Y, does not change), See revised schematic diagram in this
supplement for new circuit.

*NOTE: Changes #1 and #2 are included in chassis coded A-O3 which are used in re-
ceiver models with a -HQ" suffix, for example: 16BP7oBN-Q. Change #3 is included in
chassis coded A-04 used in models with a -HQH suffix. Chart below indicates by an X
which changes are included in each chassis.

"NON-Q" MODELS "-Q" MODELS
CHANGE A-03 A-O4 A-03 A-O4
I X X
Z X X
3 X

TO PREVENT RADIATION FROM HORIZONTAL OUTPUT CIRCUIT: Radiation shield
added at rear of flyback transformer.

TO PREVENT REGENERATION IN VIDEO IF: B+lead (blue wire jumper) to 3rd IF stage
divided into two sections and mid-pointbypassedto ground with 1000 pf, 20%, 25F capaci-
tor, c-125 (part number 215129821).

MECHANICAL CHANGE: Etched board changed from part number 84C68110A02 to
84C68110A03 to accommodate three additional capacitors ontop side of board. Capacitors
C-203, C-520 and C-125 relocated from bottom to top of board.

RELIABILITY CHANGE: B+ dropping resistor, R- 803, changed from 3.3K, 7 watt, to 3K,
7 watt, part number 175733877 to raise B+ Voltage and increase reliability 01' neon pilot
lights,

RELIABILITY CHANGE: Added two spark gaps, part number 80C68147A01, to prevent
damage to power rectifier-s in the event of an arc in the high voltage transformer or CRT,

"Onegap is located on the high voltage transformer'and'connected from the negative'rAGG

pluse winding to ground. The other gap is located at the 5-H focus lead tap and is con-
nected from B-H to ground,

TO REDUCE VHF OSCILLATOR RADIATION: c-126 added on tuner - B+to chassis.
TO INCREASE RELIABILITY: R-520 Changed to 2 Watt,
TO IMPROVE HORIZONTAL SCAN: Cv511 changed to 180 pf, 10%, NZZOO, 4KV.

TO INCREASE RELIABILITY: Spark gap and dummy lug deleted in CRT socket. R- 208,
47K, 1/2 watt resistor added on outside of socket for arc protection.

TO INCREASE RELIABILITY: Spark gap added in A-09 chassis changed to part number
80C68147A04,