Motorola bu 776 c service manual

Page 1

SUPPLEMENT No.1 television MANUAL 68P65T35A59
TO 15-594 SERVICE MANUAL,

PART No. 68P65I35A53 CHASSIS TS-594

MODELS BPSOSC, 506C, BT604C,
BU774C, 775C, 776C, 777C

service manual

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MOTOROLA \[L ,

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8 :2 MODEL BU774C MODEL BU775C MODEL BU776C MODEL BU777C
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3 0 GENERAL INFORMATION MODEL BREAKDOWN CHART
- In
3 p This supplement introduces new 12- VHF UHF
0 ~ ceivers added to the line since the MODEL CHASSIS TUNER TUNER CRT
22 g publication of the original "rs-594
» n Ix Service Manual and also contains BPSDSCN (MEETS-594 CPTT-406 PITT-624 l9GFP4
fl '5 information regarding chassis or
i "u 9 Chan es and revisions. HIT-627
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g . , BPSOéCB, D18TS-594 CPTT-406 PITT-624 196F134
This supplement includes a com- CC CW or
7} * plete revised schematic diagram, HTT-627
2 I) complete revisedparts list andtuner
g :2 service information. For all other BT604CW D20TS-594 OPTT-404 HTT-624 21FZP4 or ZlFVP4
E I- information, refer to the original or or
E a service manual. OPTT-406 PITT-627
: 2 BU774CW CZZTS-594 OPTT-404 PITT-624 23GXP4, 23GSP4,
; z or or 231-1194 or 2355134
3 " VHF TUNER - CPTT-406 OPTT-406 IPITT-627
2 BU775CS (322175-594 OPTT-404 PITT-624 Z3GXP4, 23GSP4,
The CPTT»406 VHF tuner, PartNo. or or Z3HLP4 or 23FSP4
77D67944B06, is electrically the OPTT-406 PITT-627
§ same as the OPTT-396 tuner. For
:3 schematic diagram, alignment and BU776CM C22TS-594 OPTT-404 PITT-624 23GXP4, 23GSP4,
g servicing information, refer to 01 01' Z3HLP4 01 23FSP4
3 pages #15 thru #20 in the original OPTT'406 HTT527
service manual- (Part5 list {01 the BU777CF CZZTS-594 OPTT-404 PITT-624 zscxp4, 2365124,
OPTT-396Y apphes to the CPTT- or m: ZSHLF4 or 23FSP4
40» OPTT-406 PITT-627

MOTOROLA INC. 9401 WEST e RAND AVEN U E, FRAN KLI N PARK, ILLINOIS
PART NO. 68P65|35A59 2'67 PRICE 35 CENTS COPYRIGHT I967 BY MOTOROLA INC. - PRINTED IN U.S.A.

Page 2

CHASSIS CODING CHANGES

Chas sis
Coding

Chassis Coding Changes

NO CODE
CHANGE

TS-594B-O 1

TS-594C-01

TS-594C-03

TS-594C-05

TO REDUCE TRAP DRIFT: C-103 changed from NFO to N150.
TO REDUCE LINE RADIATION: E-807 added (delete R-SOO).

TO PREVENT REGENERATION ON LOW CHANNELS: L- 114 addedin series with collector
of video output transistor, Q-S.

C-808, .001mf, HOG-0% Z5U capacitor added.

TO PROVIDE MORE HIGH VOLTAGE AND TO FIX NON-SYNCHRONOUS RASTER: T-SOO
changed from Part No. 24D67602A04 to 24D676OZA07,

NOTE: Use Part No. Z4D67602A04 only on chassis coded prior to C-Ol. Do not substitute
24D67602A07 for the 24D67602A04.

R-519 changed from 220K, 10%, 1W to 100K, 10%, 2W.
R-szz changed from 10K, 10%, 3W to 8.2K, 10%, 3W.
C-519, Part NO. 215120872, 56pf, 10%, N750 added.
E-502, Part No. 48D67120A10, diode added.

R-507 in original service manual was changed to R-523, 220K, 10%, l/ZW and connected to
filtered boot.

R-525, 120K, 10%. 1/2w added,

R-524, 100K, 10%, 1/zw added.

C-809, ZOmf electrolytic, added.

R-809, 470, 10%, 1/2w added on tuner (RF 13+).

C-SZO, .OOSmf, 1KV disc capacitor added.

R~203 changed from 68K, 10%, 1/2w to 150K, 10%, 1/2W.
R-ZOé, 6.8K, 10%, 1w added. '

C»202 changed from 1812f, 10%, N150 to 82pf, 10%, N750 and relocated.
R-315 changed from 270K, 10%, 1/2w to 560K, 10%, 1w.

R-306 changed from 2.2 meg, 10%, 1/4W to 1.8 meg, 10%, 1/4W.
R-308 changed from 2.2 meg, 10%, 1/4w to 680K, 10%, 1/4w.

C-512 deleted on C and 22TS-594 (23) chassis. Changed from lBOpf, 10%, NISOO 1:0 100pf,
10%, N1500 on JTS, 18TS, D18TS and DZOTS (19" and 21") chassis.

ADDED RELIABILITY: CRT socket changed from Part No, 9C67191A07 (with internal
spark gap) to Part No. 9CE>7191A08 (with external spark gap).

TO IMPROVE VIDEO BIAS: R-117 changed from 10% to 5% tolerance.

R-1zo changed from 1.2K, 10%, 1/zw to 1K, 10%, 1/2w,

R-506 changed from 6.8 meg, 10%, 1/2w to 5.6 meg, 10%, 1/2w.

TO CORRECT HORIZONTAL SIZE: R-SZZ changed from 8.2K, 10%, 2w to 6.8K, 10%, 3w.

C-512 changed from 0 to 68pf, 10%, 4KV on 22" chassis and changed from 100pf to 180pf,
10%, 4KV on 18" and 20" chassis.

C-503 changed from .15, 20%, 100V to .05, 20% 100V (for faster timing in AFC circuit).