Motorola sts 934 service manual

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Extracted text from motorola sts 934 service manual (Ocr-read)

Page 1

INFORMATION
cONTRo L PANEL AND TUNEE

S____ERVICE To swing open control panel, re-

PANEL REMOVAL AND GENERAL SERVICE

TO REMOVE PANEL ZA
Pry between panel and chassis ad-

® MOTOROLA FigureA
TO SERVICE CHASSIS PANELREMUVAL

Disconnect power by disconnecting

CHASSIS MAY BE SERVICED WITHOUT REMOVING

cheater cord before removing or in-
stalling panels.

jacent to studs.

@L
MASTER éﬁﬁlT/

move three (3) screws (B) (also see Figure B).

g" *- 7 BACK 99V) ALTERNATE PANEL TONE Um; W
'm ..._ (=72 I. R
a 75 ohm IN SOME SETS kingg éHEDQ 39. IC s5 _% //@h7\) knobsemove speaker panel and
. . M. / I 7, VIDEO /PEAK|NG ' _
L5 --»-l_ I L7 67 0y- ADJ E ['3ng 1E7 g 2. Remove st (6) screwsm
3-53?! ' [ii-J- HUE >@ COLOR /" TI 81)) V «.@&7 (y. VHF
1 Remove one (1) interlock screw OSC ADV J RANGE E) KILLER COLOR A K \I/ W
. ADJ 06E 2 BLU; l 1. Open control panel door
lNSTA-MATIC 47.1. 8 ~, Facturv hFOTD/EOJ g z or: REGULATOR INSTAMATIC COLOR 2 R -
MDNAUHAL O O 2 Depress to unlock chassis and push chassis forward. Con< COLOR CKT 1:} ICE-33 E 3 CR KT? Pre-set .. ,, I; I PANEL ZA I'ND'CATOPI LIGHT r} - emove speaker panel.
AUDIO OUT nect cheater cord to interlock, then, pull chassis fun/van] NOT ADJ LT; BBESU/ COLUH'VIDED PANEL CA '50 I: 5 A I; 3 Remove control WWW-
C'RKTg) 0'" from to SWP- CO LOB-VIDEO PANEL "CAuI INTERLOCK_ .. QP'QQSI" VHF TUNER - Loosen three (3) screws and remove.
BR KH - 7| \, \\
\ I q, I_ I DELAY LINE I® )AFT IF AUDIO l I (669$ M UHF TUNER - Remove two (2) screws.
ACIIICERLOCK TO REMOVE PANEL CA" . pANEL . 5 9 3 3, To REMOVE KNOBS - Pull straight out.
---'.-._ BA" I .
L A Remove red shrpprng pIns (canoe) CONVERGENCE

CHASSIS LOCK

T0 SERVICE HORIZONTAL OUTPUT AND POWER
SUPPLY, REMOVE BACK COVER.

POWER SUPPLY & HORIZONTAL OUTPUT

from lower mtg studs, then push
panels fo mounting studs from rear
(see Figure B)

T REVIOVE PANEL KA" AND /-
SHI : . ASSEMBLY

TAKE-OFF,"

PANEL HA"

(Grimm

Remove two (2) screws and lift re-
taining strap. Unplug AFT take-off,

DEFLECTION PANEL "FA"

B+ lead under shield and AFT lead
to tuner.

TO REMOVE PANELS "BA AND

GCWS SBLB ,/

'@:J VERT LIN.
CHIIZBVIERT SIZE

ing studs from rear (see Figure B).
TO REMOVE PANEL "FA"

C ONTROL ESCUTCHEON
(Top half cut away)

§PEAKER PANEL REMOVAL

Press downward and outward

TO REPLACE. Insert top first
then snap bottom into position

VERT OSC
RI , ,,,,,,,,,,, emove one (I) screw and lift re-
taining strap. Push panel off mount- / WE (IL i Em 0" "9" 3"" _ cHASSIS ~ LEFT SIDE DETAIL
' / swrng panel down to same

position. Pry between panel

Push panel off mounting studs from r 2332??) and bracket adjacent to
VERTICAL PINCUSHIDN rear (see Figure B). P>VII\ _WAR|V| UP MTG STUD--- mounting studs.
)Ufﬁjf'ﬂovjNﬁJEﬁﬁfggmgt ---T° E'NSTA PANELS RELAY \7)
' ' > Align panels with mounting studs \Q@(
TO SOLID STATE 2. ADJUST VERT PC COIL FOR . and press down wrth dull tool ad- "-LLT
DEGAUSSING DEGAUSSING SFEIIDAMETRICAL BARRELING AT iacent to studs. 3 t -; A 3 A
0 . U H II H
can SW 30.) STATE 3 AISJIJSITSEMRT PC comm R514 L50.) F/ ure 3 QALICULOR V'DE PANEL 5 0'3, 0" cHAssrs STOP cLIP. OEPnEss
$333125? FOR OPTIMUM CORRECTION AT VERT PC :ERT ___-..g NIE> O 0 TO REMOVE CHASSIS
/ TOP e BOTTOM. CONTROL COIL DIAL LIGH___T_:_S I' Pongﬁgusggnv
0 O O 0 ._ __ _ -
_ J T500 0) (F__-LIIIII:I7SE?£AM out to replace bulb INSTAMATIC J h (ﬁg) 3315
-I l l: _ - - INDICATOR/ ,x 0 Q "##5 0 980% égnMJ r @233 UP
T R0 U BLES H OOTI N G Lmj T SWING OPEN c I NTROL A A I'Cg"'""r-~'.:T.T5 -" EXP-'0) f RESISTOR PANEL "SAI" "CAI" "BAI" AND "FA" REMOVAL
HOTELZFBDUT PANEL Remove 3 screws INSTAMATIC.- A , EA r_ _ :. ? U L ' 50 1 10 Panel BA" only - REMOVE Stfﬂp- 399 9 A-
/ \ j - /COL0H SW :IF _ AUDIO PANEL "BAA OZOO rl : I All panels - push off mtg stud thru respective holes "A".
\-~- I ~ I -35V §uppLyI Apply steady pressure. Avoid prying. Use a dull flat tool.
TS/STS-934 J SOURCE [I NOTIN ALLS/ETS '
/V2 .1 '
C I V CHASSIS 432E? @ can I cum
cHa 40V INSTAMATIC BRITE ' __~ . I -
FOR QUALIFIED SERVICE PERSONNEL ONLY c r ~. I \oa mu coma . , :R ': I ,,. .W
POWER SUPPLY - _ . I L BCJ3__ _ l . OEFLECTIDN : . I .
h. . I --lT __ :l v\_ , (lg PRE SET HUE I I C, "F n . O '
WARNING: HIGH VOLTAGE. TIT/s app/lance has no customer serviceable components " VDRWRRnZw-J H A CONTROLS INT ) A L-LNEL A - )
HI VOLTAGE REGULATOR HORIZONTAL MASTER G1TAPS )oc ~- , 4444 I -Ao EMA;
. BIASRsoa USE 40v TAP ONLv - I
_ POWER SUPPLY CHASSIS REMOVAL. FACTORYPRESET IF CRT CANNOT BE
SHEET 68F65129A31-A PRINTED IN USA gig/lg"): 22112;? SCREWS FROM NOT ADJUSTABLE CUT OFF WITH
PAN. ---_.._...._ BRITE CONTROL

Page 2

NOTE: CA PANEL DIAGRAM INCLUDES INSTA-MATIC COLORPRE-SET CIRCUITRv; SWITCH IN I" (INSTA-MATIC) BRIGHTNESS BTW-PANEL REPLACEMENT

POSITION. FOR SA" PANEL CIRCUIT (NO SWITCH) FOLLOW CIRCUIT PATH IN M" (MANUAL) POSITION. I 8 TROUBLE SHOOTING CHARTS
AFT PANEL KA" IF & AUDIO PANEL BA SW 17 MAST BRITE - f e i not - ed with
SPKR COLOR ' VIDEO PANEL M " IIIIISmTAIMSAtTIsc COLII'RW tf t d E
u n u m ' re-se ea ure, Is-
ANT 16 SA & CA 50 &_HIGH ER 16 T 3%305V N0 COLOR regard refergnlce t; "CIR Panel and d ALL SYMPTOMS
l ' 't n as to
{:3 OHM CA 11 17 Adj fine tuning for $52??? D or W' I a 50 Egstck splfr, vol. 8: tone
M 19- __I BLANKING hestB&W icture rolcucuIts
AUDIO AMP SYNC-AGE FROM ZFA VOLT P If set is equipped with INSTAMATIC
u u DR IVER 9 47 9 REG COLOR Pre-set feature and trouble exists
I IC OUT CONTRAST TAKE'O F F V Change Panel "BA" or "FA" only when switch is :n ON" polslItIon,
h k - t 't er-
M HIE M L - .16., I- ._ L IIIIIIIIIIII:IIILIILILI.
SW1 EZZI 8;] - 7 ' COLOR VIII'IEO 25 I I I I I d anal-
OSC l. 9 ' l L No COLOR SYNC
VIDEO Arm's-6 2ND 95 0
RF VIDEO ' MOD UT Adjust color osc L5
VI DEO __. . "SA" "CA" Alternate Color Panel _k > -
MlX 1 2 E 3 1 VIDEO CTO PEAK r DRIVE-i -T ggneltorIliIIstcolor sync ,3. RANGE R
. ..____AUTO- _ ~ .. ,. ~ I ' RI- M G
'NTENS'TV 5 INTENSITY ' LIIMILI SLIM e » IIIII ILL. B .
GREEN 24 j I i [a M J in" V M. IIFITTDRDJ Eta Eff-II? IIOTDADI
| 24 14 r g O---> VIDEO 4 1 I . I ~ I v .. ~ cmon-VIIJEOPANEL"I:A'£so
-E I; L-Y- - HUE RANGE ,
SW1 2; A 2° DR VEUT NOT CENTERED g
I P hi I. c I ' h
M 22 k 5 / DIJIS. Cennster IlIu'IerIJVIIttTOI AFT 3+
_ l-I-I (-> LCD OR 2. 3+ and adj. L7 or L3 AFT
- - ' '- DEIVIO D 8t ' - TAI L---._-_-_-I 3 20v 3+ 13 PULSE 15 4 PROCESSOR BACKGROUND BLUE - 23 J TAP """
o o VIDEO
SHIFT HUE CONTROL
A V ..,c., OUT INOPERATIVE II .
. PhI.CI 'hf. as
53th IIIFIIL°IIIIII'IIILLILITID DRIVE , gchTV , LIL":IIIIIJLII'LILILI / _ﬁﬁ '- -
T0 178A IIIIEGIHTIITII'IEL'LVEIIJIIMIIIIN" j R
BLAN KING AND DUTPUT' REGULATOR 21 3 22 2- Check Inst. Color switch
w DEFLECTION VERT & HORIZ INST IND '54.??2:
PANEL FA" I PRE SET M 4 g' [LO-1 r» 6.3VAC W
HUE I3 - 1011 12 i
M HUE I 'I (Z | HIGH VOLTAGE OK No HIGH VOLTAGE
__. __. __. SOUND OK ' '
SW1 SW1 SW1 Momentarily short (with sauna OK Ders 0mm Breaker NO SOUND
PULSE VHORIZ HORIZ H.0.T. 81 DC REG PANE n screwdriver) heat sink of red,
FORMER AFC, OSC -> OUT -> DAMPER - YOKE $.15: d L 2A grrgﬁgvsgr ﬂﬂﬁrg'ﬂﬁgfmm Substitute oLFC,_C_CH3, Change Panel 2A"
81 DRIVER V3A V1 V2 0 u l0 Does corresponding color BBL8 8 HV RectIfIcr Check 20V regulator transis-
I i 6.3VAC 260 305 aPPear on CRT screen? Change Panel FA" tor.
MAX . Check silicon diodes (doubler Checkjor 30V at term two
' 5° n CURRENT YES NO IIISMEIS'JIL'WM "mm" PM ZA
VERT VERT CONVERGENCE PANEL "HA" 10W RELAY LIM y ' Remove Panels "FA, "SA"
' , , _ Change Panel Check 62 Defective component in horiz. or CA". "KA" 8: "BA" one
OUT - OUT m -P-V-II- - _ - "SA" or COMIDIS, Output or damper circuit. at a time - to locate reason
V4 XFORMER , T0 0 ER "CA" car, a. for loss of zov.
HORIZ & VERT CONV Ac / SUPPLY Check bright- connections
11 BOOST DYNAMICS cc LS IN], j I ness circuit
T / To Fil Tube I
TERMINAL NUMBERS ARE RELATED TO PANEL CONNECTIONS / CRT F

INSTAMATIC COLOR SWITCH NUMBERED 1-12,13-24, LEFT TO RIGHT FROM FRONT OF SET l..._ ' _./

or connection
'* at CRT socket

GER" T'r .* -.'- A I

ONE COLOR PREDOMINANT

OR MISSING
Push Inst Color Pre-set switch to off.
Unplug cathode lead of CRT which
has missing or excessive color 8:
interchange with one that is normal.
Does same condition exist?

* Defective CRT

LITTLE OR
NO VERTICAL

Substitute

I? can: and cows

Replace Panel FA

WEAK OR NO L
VIDEO

Place screw driver
on delay line input

or output, with finger
inject noise.

Does picture change
significantly?

YES

Replace
Panel BA"

5 Check all connections to
"'KA" Panel

Replace "KA" Panel and
make necessary adjustments

HORIZ AND
VERT

Turn channel selector
to unused Channel.
Does snow appear?

5 Change
I Panel FA" was

HORIZ
Adjust horiz hold
control

Change Panel "FA

ACheCIT vert. hold control

Substitute vert osc
_.:| Tube CBLB (V3)

Substitute vert output
tube BCW5 (V4)

Change Panel FA"

IMPROPER
AFT ACTION
Perform AFT adjustment

as indicated on rear
of schematic diagram.

_Change Panel "KA" _

INOPERATIVE

1. AFT off~on switch and wiring.
2. AFT plug to tuner.
3. 8+ at pin conn. ,

4. 45.75 take-off from BA pane