Philips CTV S26K497 User manual

CTV S26K497lrc
Servlce
manual
P tups
o
@
@
@
Volume control
Tone control
Brlghtness control
Contrast control
o
@
o
75 O F"M sound
magnetlc I. F. chromln[utce
electro- statlc Subcarri.er
38. I MHz Malns voltage
32.9 MHz Power consumptlon
Band I (WIF) 47 - 68 MHz
Band III (VHF) 1-74 - 230 MIlz
Band IV + V (LIHF) 470 - 890 MlIz
Rl3 81
R976
Rl3 80
R92 9
Saturatlon control R1382
Hue control R1043
VItrF + IJHF hmtng U14
6,0 MHZ
34,47 MHz
4.43 MHz
220 - 240 V
280 W
@
@
@
Slrlted for receptlon of black-whlta and colour transmltters operatlng according to CCIR-PAL standard.
Aerlal match-tng
Convergence
tr'ocus strng
I. F. lumlnance
I. F. sound
s)
604 PURLEY WAY . WADDON. CROYDON . CHg 4DR
TELEPHONE: 0l-686 0505 (Recorded messages after business hours) TELEX: 262308
Index: CS27062-CS27074, CS26984, CS26985, CS27075
Matns swlteh SKl
Black-whhte/colour swltch SK-3
Speech/muslc swltch SKz
Subject to modification
4822 727 L0525
Printed in the Netherlandg
csz7062

WARNINGS
. As the chaesls ls llve lnde@nddnt of the posltlon of the malns
plug the set shcrld be connected to the rnalng vla an lsolatlng
trangformer (approx, 500 VA) wben the rear panel ls removed.
. Due to the htgb tenslon (ca. 25 kV) the valves ln the HT cage
produce a certaln amount of X-radiatlon. However, when the
cage ls closed the screenlng ls so effectlve that the X-rays
ca:mot leave the cage.
To prevent that the set can operate wlth opened HT cage a
safety swltch has been provlded whlch lnterrupts the 92
voltage for the llne output valves. Thls ewltch should never
be closed or shunted when the cage ls open.
After repalr ensure tlat all Bcrews tn tle ltd are properly
tlghtened.
. Never replace valves or components whlle the set ls svltched
on.
. U6e safety goggles when replaclng the plchrre tube,
. When replaclng valves or other componenta ln the HT cage,
removlng the chasels and replaclng the plcture tube, ftrst
short-clrcult the residual charge on the plcture tube. For
thls connect a properly lnsulated wlre to the chaesls and
hold the other end agalnst the H.T. connectlon for a few
seconds.
. Be careful when meagurlng the voltages on the tube Bocket.
The focusslng voltage (on potnt 9) ls approx. 4.5 kV,
REMARKS
1. The osclllogtams have been measured under the followlng
condltlons.
a. For the black and whlte sectlon a cross hatch pattern
has been used as lnput stgnal and for the chromlnance
sectlon a colour bar pattern.
b. The brtghtness contrl, lcrob 3, at normal brlghtness.
c. The contrast control, Imob 4, set to 4 Vp-p on the
control grtd of the vldeo output valve.
d. Saturatlon control larob 5, set to 40 mV p-p on the base
of TS439.
e. The hue control, lcrob 6 ln the mechanlcal mld-posltlon
2. The dlrect voltages have been measured as follows:
No aerlal slgnal, minlmum brlghtness, maxlnum contrast
and saturatlon.
The voltages ln the chromlnance sectlon marked wlth an x
have been measured wtth the colour/black-whtte swltch ln
posltlon 'rcolour" and the collector and emltter of TS443
lnterconnected.
3. If a blank pattern ls required when the PM 5507 ls used,
thls pattern can be obtalned by means of the ralnbouw
slgnal, the vldeo knob turned fuIly clockwlse and the
black/whtte-switch of the set turned to posltlon blacVwhtte.
4. Integrated clrcult TAA550 (U414) mounted on p. c. board
8, ls avallable ln varlous verslons under one code number.
These verslons are malked as follows:
a. Red or yellow palnt dot.
The Zener voltage ls between 30 and 33 V.
Thls I. C. may be marked as follows:
No code number or code number 30 on the houslng of
the I. C.
In this case the brtdge wlre should be fttted tn parallel
wtth Rl513.
b. Green palnt dot :
The Zener voltage ls between 33 and 36 V.
Thts I.C. may be marked as follows:
Code-number 33 on the houslng of the I. C.
In thls case no brldge wire should be fltted ln parallel
wlth R1513.
MECHANICAL INSTRUCTIONS
1. - Remove the screw from the upper slde of the cover to the
left of the rear panel, and remove thls cover.
Note: The c(nvergence panel ls provlded wlth explalnlng
slgns to facllttat€ converglng. The numbers lndtchte
- the sequence of converglng.
2. Hlnglng out the chassls
- Remove the rear panel and, subsequently, the nylon
locking pln from the rtght-hand upp€r slde of the chassls
- Push the plastic locldng plate on the rtght-hand urderslde
of the chassls to the rtght.
3. Removlng the chassls.
- Hlnge out the chassls.
- Remove the plugs A,B,C,E,F,H,L,M -T-2.
- Remove the prlnt of the plcture tube.
- Unsolder the two earth leads.
- Detach the suspenslon cord from the chassls.
- Detach the H. T. -cable from the plcfure tube.
- Llft the chassls out of the two hlnge polnts and remove lt
from the chassls.
4. Removlng the control panel
- Remove the cover from the convergence panel.
- Remove the convergenee panel from tire set.
- Remove wlth a long screwdrlver.the two screws from the
under- and the upperslde of the control panel.
- Remove the slx larobs (volume, tone , etc. ) from the front
of the set and remove the control panel backrvards.
5. Removlng the push-button unlt
- Remove the plugs X and Y.
- Remove the three flxtng screws.
- Remove the push-button unlt.
6. Replaclng the hrnlng potentlometers
- Remove the push-button unlt.
- Remove the cap from the push-button unlt.
- Unsolder the leads from the defectlve potentlometer strip.
- Bend the tag wlth whlch the strlp ls flxed, upwards.
- Replace the strtp wlth the potentlometer.
7. Replaclng the p. c. board of the band swltch of U14
- Remove the hrnlng unlt from tlre set.
- Remove the screenlng cap and the polnter.
- Loosen the ftxlng screw from the p.c.board of the band
swltch and pull the p. c. board outwards. (Attentton! Do
not damage the contact sprlngs. )
- Write down the colours of the connectlng wlres and un-
solder them.
- Connect the new p. c.board and place lt ln posltlon,
carefully ltftlng up the contact sprlngs.
- Reftt the polnter and adjust the helght of the p.c.board
so that the polnter can move unhampered.
8. Replaclng valves ln the hlgh-voltage cage.
- Flrst read the warnlngs.
- Remove the cover from the H. T. cage.
- Loosen the serews fixtng the top plate, a few hrrns; push
thls plate upwards. Consequently, the PD500 ls algo
movlng upwards so that lt can be easlly removed.
- Push the valve of valve holder GY 501 sllghtly upwards
so that the top connectlon of thls valve can be removed.
- Now the valve can remove from the holder.
9. Removlng the convergence colls
- Remove the multlpole plugs N,O, and P.
- Insert a thln screwdrlver tnto the mlddle opening (Flg. 2)
and carefully press the screwdrlver downwards.to dlsengage
the locklng pln.
- Now the convergence coll can be wlthdrawn.
Note: When the coll ls lnserted agaln lnto the holder, one
should hear the holder cllcktng ln the openlng of the coll.
Fig.2
csz 7063

GR163 /oatr.e
TS 121 , L22,L23,L58
BLOCK DIAGRAM
SOUND
s526,527
B -Y-001
B-P-002
GR160 /oarcz
u1l.'17
TS 426
B -T-007
TS 521 - 8402t U5540 U554
B -C-010
U562 od,o
B-C-015
TS /.3/.
B- C-012
I
tE_AMp. I cHRol
i DETEc
B -S -001 B -S-005
U 536o, U 553 b
B -L-007
LUM INA N CE
U536c
GR459, /,70 ,L72,L73
TS/,25, L27,L28,L29
B/,01, 416t
I
I BURS'
BURST AMP io,ra*,",*
I
B - L-010
H OR IZON TA L
TS /.52, 453 6R /.90, /,91 8408t 8408p
U589 e
GR 495
Bl.10,t'11,u2 8L13, L1L
B -T- 008
B-L-009
B -T-007
IF. AMPLIFIER LUM.IF.AMP.
CHROM. IF. AMP. OETECTOR
B-C-010 B-L-008
U553o
B-r-007
PULSE AMP PHASE DISCR
VERTICAL
TS455 TS 456 6R 496 8116p , L17 T597
B-T-002 B-T-003
EMITTER FOLLOWER
( L uM.)
B -T-007
TS15r 6R488
INTERFERENCE SUPPR PULSE AMP. AUT. FIELD SYNC. TRANSDUCTOR

OCK DIAGRAM
CHROMINANCE
TS/.36 / tstls
IE-A MP, CHROM.
DE T ECTOR CHROM. AMPLIFIERS
B -C-012
B -C-011
U562 od,of,oi,op TS 435 U 563 k U 563 n,t,
B-C-016
TSI.I3,LLL GR479 R 1215
CHROM. AGC.
REACT CIRCUIT I
- ---1suB.osc AMP
suB oscrrL. :
"WHITE" SETTING
COLOUR KILLER +
WHITE SWITCH
U553e B-C-017 B- C-018 B-B-007
_ CH ROM. VIDEO -
u578 i.f 8403,10/., 405
TS /.3/.
GR 198
R1299/ | R 1307
B - B-007
TS t L\,Ll.2 GR 493 B -C -012
TS 4/.7 GR 185, /.86 BLUE LATERAL
CONV. STAT. CONV,
B-B-009 r B-B-009
HOR CONV. VERT. CONV
B-B-002 | B-B-003
COLOUROIFF. AMPS.
+
DC LEVEL SETTIN6
(R-Y)AMPLIFIER BEAM CURRENT
SETTING
TS 445
MULTIVIERATOR
(B-Y)AMPLIFIER 499,500 R1315
The lay-out of thls block dlagram follows the lay-out of the
clrcult dlagram as closely as posslble.
Wtth the aid of the numbers of the valves, unlts, etc. stated
above the blocks, the relevant sectlon of the ctrcult dlagram
can be located eaeily. The numbers below the blocks lndlcate
the chapter of the SERV-O-MECUM ln whlch the worldng of
these clrcuits ls descrlbed.
B- C -0i5
B- C-012 B-C-012
B-C-013 B-C- 029
B -C-0 12
/ R1323
I T V 2/.16

v7 841
R 1125
u572
R 1050
(R-Y)'+(a-v)'l+
+*
€
(R-Y)'+ (g-Y)'
u 569
u 553
SATURATION//CONTRAST TD 570
u 552 R 997
32.? MHz
R1126
u 578
lDENTIF.T,SkHz u s62
u536
v5L7
TD 5/.0
R 1055
5,5 MHZ
R
2o A 1338
2b 6.tlt,
1o Q n37
1b - 1336
R
ao o1Z:rL
4b Or|rs
5o Sr5rs
sb o tlrc
8o Or!r,
sb orlre
6o Q t5rt
@t$v
1 330
o
o
3/,,5 MHz
@e
33,1 MH z
Oo
SK9
SK8
sl(10
G2 Blr!
R 1299
R1307
s 598
R 1303
R1298
R1306
cs27065
KONVERG.
Fig. 3

Y
r03
I
72
l
R1258
R909
+25
8 L1L
PD 5OO
s 598
G2 8119 B 419 s6o4
R1299
R1307
R 1215
HOR. SYNC
BALANCE
B 41 AlBA11
2
R 1207
R1212
Fig. 3

AADJUSTMENTS
t- Adiustlng for a stralght ptchrre (see Flg.3)
Sllghtly loosen screw B. T\rrn the complete deflectlon
unlt stlghtly to the left or to the rlght untll the plchrre
ls stralght.
Ttghten screw B agaln.
2 Focuslng (see Flg. 3)
Set potentlometer ap of U589 so that the entlre plcture ls
as sharp as posslble at hlgh brtghbress.
3 Pln-cushlon correctlon (see Flg. 3)
z. Wlth the atd of 5598 and Rl292 make the horlzontal
llnes at the top and bottom of the plcture as stralght
as possible.
b. Wlth the atd of R1179 make the vertlcal llnes ln the
mlddle of the plchrre as stralght as posslble.
Horlzontal llnearlt (see Flg. 3)
Thls ts adjusted wlth the core ln coll x of U589.
Vertlcal llnearlty (see Fig. 3)
a. Devlatlons over the full plchrre helght are corrected
wlth the ald of R1273.
b. Devlatlons ln the top of the plchrre are corrected wlth
the ald of R1284.
Plcture helght (see Ftg. 3)
Thts ls adjusted wlth R1266.
StatLc convergence (see Flg.3)
Use a dot or cross-hatch pattern.
a. Swttch off the blue gun wlth SK1l, see Flg. 3.
Make the red and green patterns colnclde ln the centre
of the plcture by means of lmob la and knob lb. Thus
a yellow pattern ts obtalned.
Srrltch on the blue gun agaln.
b. Adjust lmob 2a and 2b so that the blue pattern and the
yellow pattern colnpl$e in the centre of the screen. As
a result a whlte pattern ls obtained.
Note: If no satlsfactory result ls obtalned, lt ls possl-
ble to lnterchange the termlnals S1-S2 of the -blue lateral
untt, see Fig. 3.
10 Dynamlc convergence (see Flg. 4)
Remove the cover ln front of the convergence panel.
Start by checklng ild, lf necessary, readjustlng the statlc
convergence (see polnt ?a and 7b).
Use a crossl'hatch pattern, swltch off the blue gun wlth
SKll.
If the centre horlzontal green and red llnes lntersect, turn
the core of S604 (see Flg. 3) untll the llnes are parallel
as far as posslble or untll they colnclde.
Slttch on SKll.
. Wlth lcrobs 7a, 7b and 7c (only lf the convergence strongly
devlates): start wtth the lsrobs ln the mld-posltlon.
Make the central horlzontal blue llnes as stralght as
posslble.
. Srvltch off the blue gun (SK11).
. Wlth lonob 3:
Adjust so that the horlzontal red and green llnes are
parallel over the entlre plcture wldth.
. Wlth lmobs 4a and 4b:
Adjust so that the central vertlcal red and green llnes are
parlllel over the entlre plchrre helght.
. Wlth lmobs 5a and 5b:
Adjust so that the dlstance beiween the horlzontal llne
palrs (red + green) ls equal over the entlre plcture helght
ln the mtddld of the screen.
. Wlth lmobs 6a and 6b:
Adjust so that the dlstance between the vertlcal llne palrs
(red + gleen) ls equal over the entlre plcture wldth ln
the mlddle of the screen.
. Cary out red and green statlc oonvergence (see polnt 7a).
. Wlth lmobs 7a, 7b and 7c:
Adjust so that the central horlzontal blue llne and the
correspondlng horlzontal yellow Ilne are parallel over
the entlre plchrre wldth.
. Wlth lorobs 8a and 8b:
Adjust so that the dlstance between the horlzontal llne
palrs (blue and yellow) ls equal over the entlre plcture
helght ln the mlddle of the screen.
. Statlc convergence (see 7a and ?b).
. Wlth lmob 9:
Adjust so that the dlstance between the vertlcal ltne
palrs (blue and yellow) ls equal over the entlre plchrre
wtdth ln the mlddle of the,screen.
Note: If no satlsfactory result ls obtalned lt ls posslble
to lnterchange the termlnals R1-R2 of the blue
lateral unlt, see Flg. 3.
. Statlc convergence (see point 7a and 7b).
11 At the back of the set above the addltlonal loudspeaker
socket there are the knobs R, G and B (Rl302-R1298
and R1306 respectlvely) behlnd the cap on the rear panel.
Wtth these knobs the background colour can be adjusted
accordlng to the wlshes of the customer.
7.
Centrlng (see Flg. 3)
a.. Wlth R1290 the picfirre carr be shtfted
dlrectlon.
b. Wlth R1289 the plcture can be shlfted
dlrectlon.
ln the horlzontal
ln the vertlcal
Colour purltv (see Flg. 3)
Allow the set to warm up for approx. 20 mlnutes. Apply
a blank pattern slgnal. The room should be as dark as
posslble, brlghtness and contrast should be set to normal
llght lntenslty. Slltch off the green and blue guns by means
of SK8 and SK10 respectlvely.
Loosen the four wlng nuts A a few firrns and sllde the
deflectlon coll as far as possible forwards or bac}ilvards
untll the red blur on the screen ls as small as posslble.
After thls the red spot ls centred as well as posslble by
means of colour purlty rlngs C.
After thls the deflectlon coll ls slld back untll the entlre
screen ls unlformly red. Subsequehtly, check the blue
and green colour purlty by flrst swltchlng on only SK8
and then only SK10. When after thls SK8, SKg and SK10
are swltched on slmultaneously, a unlformly whlte plcture
should be obtalned. Thls plcture should contaln no blurg.
If lt contalns blurs, correctlon to some extent ls posstble
by sllghtly hrrnlng the colour ptrrlty rlngs and/or sllghtly
movlng the deflectlon coll. After thls the three colours
should be rechecked lndivldually. Tlghten the wlng nuts
agaln.
If no prqper result ls obtalned the complete procedure
should be repeated.
For checklng the landtgg of'the electron beams on the
phosphor dots,use can be made of mlcroscope tlrye 800/
MLS, ordertng number 4822 395 90041.
csz?066

3.
1.
2.
7.
8.
ADJUSTMENTS AFTER REPAIRS
IF-AGC
Adjust R1003 for ma:rlmum nolse ln the plcture (no stgnal).
HF-AGC
Thls clrcult ls only operatlve at very strong lnput slgnals.
If the plcfure of a local transmltter ls dlstorted, adjust
R997 so that the plcture ls undlstorted.
Horlzontal tlme base (use a cross-hatch pattern)
a. Connect junctlon C785/R1170 (M7) to chassls.
Adjust U587 so that the plcture ls stralght.
Remove the connectlon between junctlon C785/R11?0
and chassls.
b. Connect bTS453 to chassls.
Adjust Rl162 so that the plcture ls stralght.
Remove the connectlon between bTS453 and chassls.
Booster voltage (a) and booster dlode current (b)
(use a cross-hatch pattern)
a. Connect a valve voltmeter (range 1000 V d. c. ) between
junctlon C860/5590 (r'-'r) and polnt 10 of U589 (Ml0).
Adjust Rl207 to 550 V meter deflectlon.
b. Connect a valve voltmeter between 9B410 (M8) and
3B411 (M9).
Adiust Rl203 to 0 V meter'deflectlon.
Check the voltage under a agaln and, lf necessary,
correct lt.
Note: The booster voltage should be aceurately adjusted
to the value speclfled and should never exceed thls
value.
Also take lnto: account the tolerances of the measurlng
lnstrument used and ensure that the mains voltage does
not devlate.
5. Beam current llmttatlon (use a plaln whlte and synchronl-
zed raster)
Brlghtness and contrast to maxlmum.
Remove jumper across R1213 (wlre support on hlgh-vol-
tage cage).
Connect voltmeter across R1213 and adjust for 0.1 V
wlth F"L2]-2.
Subsequently, brlghtness and contrast to mlnlmum. The
meter readlng should now be 1. 3 V (t 0. 1 V)
Reflt jumper across R1213.
Check the booster voltage. For any eorrectlons see
polnt 4a.
Cut-off polnt of plcture tube (use no aerlal slgnal)
Remove slngle plug from p. c. board 4. (CRT-base panel)
R1298, R1302 and R1306 (g2-flne adjustment) to mld-
posltlon.
Make the room as dark as posslble.
The potentlometers mentloned below should be adjusted
so that the screen just remalns dark.
R1299 for the green gun (swltch on SK8 and swltch off
SK9+SK10 ).
R1303 for the red gun (swltch on SK9 and swltch off
SK8+SK10 ).
R1307 f.or the blue gun (swltch on SK10 and swltch off
SK8+SK9).
Swttch on SK8 and SK9 and reflt the slngle plug.
Apply a black /whLte test pattern from a transmltter or
a generator, and vary the brtghtness from hlgh to low
wlth the brlghtness control.
Lr so dolng, the grey hue should not change. Correct any
devlatlons at a low level of brlghtness by means of larobs
G, R, and B.
(Rl 29 8 , R130 2 and R130 6).
+25 Supplv Voltage
Connect a voltmeter between the collector of TS421 and
chassis.
Adjust R909 so that the meter readlng ls 24.6 V.
Vertlcal tlme base (use a cross-hatch pattern)
Short-clrcult RL246.
Connect an 8.2 M0 reslstor between the cursor of R1258
and 28416.
Adjust R1258 untll the plcture ls statlonary;
Remove the short-clrcult and the 8.2 M0 reslstor.
Vertlcal output stage
Connect a voltmeter between 784L7 and chassls.
Adjust Rl280 to the voltage value lndlcated on the chassls.
10. Trackln of saturatlon and contrast (appty a colour slgnal)
Contrast and sahrratlon controls to maxlmum.
Connect an oscllloscope to 7M05; measure and note down
the peak-to-peak value of the colour slgnal.
Connect the oscllloscope to 7 8401; measure and note
down the dlfference ln voltage between the black and the
whlte level.
Reduce thls voltage wtth the ald of the contrast control to
Z/S of. the value measured.
Connect the oscllloscope again to 78405 and adjust R1055
to 2/3 of the voltage measured at thls polnt.
11. @ (e. g. after replacement of plcture tube;
use a blank pattern)
Set the colour swltch SK3 to posltlon black a^nd whlte.
Use another set of the same type as a reference; thts set
should be connected and adjusted ln the same way.
Allow both sets to warm up for approx. 10 mlnutes.
Adjust the cut-off polnt of the new plcture tube (see polnt 6).
If requlred, correct t};re 92 flne adjustments (R1298, R1302
and 1306) untll the llght lntenslty of both tubes ls the
same (at low brlghtness).
Next, set both hrbes to a hlgh brlghtness. If the whlte
oolour of the new hrbe devlates, the cursors A, B and C
of sllde potentlometer R1215 (see Flg.3) should be adjusted
untll the whtte tones of both tubes are approxlmaterly
the game.
If the sllders A and B of sllde potentlometer R1215 have to
cross each other, the jumpers V2 and V3 on the plcture tube
prlnted panel can be soldered ln the other positlon.
In both sets remove SV3 and connect the pln of SV3 on the
p. c.board to the +25 V (junctlon R9L4/R905 on prlnt 5).
Now eqtrallse the white colours wtth cursor D.
Rernove the lnterconnectlon and reflt termtrral SV3.
4.
6.
9.
csz 7067

(J TRIMMING INSTRUCTIONS
Note s :
Durlng trimmlng the T. V. set should be connected to the
malns vla an lsolatlng transformer (500 VA).
The measurlng equlpment should be properly earthed.
Applvlng the IF-slgnal
Apply the IF-slgnal vla 1000 pF capacltor to polnt G of the
VHF channel selector (prlnt 8).
A. LUMINANCE CIRCUIT
1. The IF st es * lumlnance detector (see Flg. 3)
Set the band swltch to posltlon UHF and apply unmodulated
IF slgnals of approx. 10 mV to the IF lnjectlon polnt on
the VHF channel selector (see polnt 2 under "Notes").
Turn the contrast control to ma:r.
Appty a dlrect voltage of 5.5 V between junctlon R1003/
C681 (measurlng polnt 'tN'.I?rr) and chassls ('r-rr at chassls).
Connect a valve voltmeter (posttbn 10 V d. c. negatlve)
to junctlon S45I/C654 (test potnt '?M3"), arid adjust the
cores mentloned below for mlnlmum meter deflectlon.
"frf of. 1J552 at 30. 9 MItz tt
rfef r of. U552 at 30. 9 MHz x
rrlil of. 1J552 at 40. 9 MHz x
rfirr of U552 at 40.9 MHz x
f rdil of U553 at 33, 1 MHz
rrdrr of U536 at 33,1 MHz
rfe'r of U536 at34,5MHz xtr
U551 at 32.7 MHz
x Cores f 'et' and ttj, of U552 are hollow and are located
at the top of the coll can.
Coll 'ff'f and tflfr are accesslble by means of a trlmmlng
key through the hollow cores rferr and rrjrr.
xx For adjustlng thls core flrst lnterconnect the collector
and emltter of TS443.
Checklng the IF bandpass curve
Set the band swltch to posltlon UHF and apply a wobbulator
slgnal of 36 MHz (sweep 10'MHz) to the IF lnjectlon polnt
of the VHF channel selector. Apply a dlrect voltage of
5.5 V between junctlon R1003/C681 (test polnt ttMz'?) and
chassls (rr-rf to chassls).
Connect an oscllloscope to polnt 1 of U536.
The curve should be as sho'urn ln Flg. 7 . When the
collector and the emltter of TS443 are lnterconnected,
the dotted curve of Fig. ?, should be obtalned.
3 0,gMHz
>500 x41,5 MH2
THE CHROMINANCE CIRCUIT
The IF chromlnance detector (see Flg. 3)
Set the band swltch to posltlon UHF an apply an unmo-
dulated 36.8 MHz slgnal of approx. 10 mV to the IF
lnjectlon polnt on the hharurel selector (see polnt 2
under |tNotestt).
Apply a dlrect voltage of 5. 5 V between junctlon
R100s/Clat (test polnt "M2") and chassls (ff-'' to chassls).
Connect a valve voltmeter (posltlon 10 V d.c., negatlve)
to polnt 1 of U554 (test polnt ttlU,.f.z9rr) and adjust core I'in'r
of U554 for mfurlmum deflectlon.
Checklng the IF bandpass curve
Set the band swltch to posltlon UHF and apply a wobbu-
lator slgnal of 36 MHz (sweep 10 MHz) to the IF lnjectlon
polnt on the \IHF channel selector. Apply a voltage of
5.5 V between junctlon Rl003/C681 (test polnt rfM2")
and chassls (tr-r' to chassls).
Connect an oscllloscope to polnt 1 of U554 (test polnt
f rM29 rt).
The curve should be as shown ln Flg.8.
30,9MHz
>500x 41,5 MH z
>70x
B.
1.
1.
2
2.
,Fig.8
\\
2
I
I
3. The 4.43 MHz chromlnance-ampllfler, see Flg. 3
Pull out the IF cable at the bottom-left on the chassls
Turn the saturatlon control to max. and set black-whtte/
colour swltch (SK3) to posttl-on "colours'f .
hrtercormect the collector and emltter of TM43.
Connect an oscllloscope (prosltlon AC) or valve voltmeter
wlth frequency range up to 6 MHz to the collector of TS439.
Apply an unrnodulated 6 MHz slgnal (approx. 10 mV) to
polnt 1of U55A (test polnt I'M29rr) vla a capacltor of
2200 pF and adjust core I'bf f of U558 for mlnlmum ampllhrde,
Now apply 15,5 MHz slgnal and adjust core t'err of U558 for
mlnlmum amplltude.
C.:SOUND SECTION
The 6 MHz sound sectlon (see Flg. 3)
P'rlI out the IF cable at the bottom-left on the chassls.
Apply an unmodulated 6 MHz slgnal (approx. 10 mV) to polnt 1
of U554 (test polnt rrM29") vla a 2200 pF capacltor.
Connect a valve voltmeter (pobttlon 3 V d. c. posltlve) to
junctlon R975/C665 (test polnt "M5t'). Turn core 'h, il' of
U547 a quarter turn antl-cloclsrdse (the meter glves a readtng
of approx. 1 V) and adjust ?tf , g" of U547 for ma:r. meter
deflectlon. Subsegrently, connect an 820 Q reslstor between
polnt 3 of U557 and chassls and adjust rreff of U557 for max.
defleetlon.
Remove the reslstor from polnt 3 and connect lt between
polnt 9 of U55? and chassls and adjutst "c,d" of U557 for
max. deflectlon.
Remove the reslstor and adjustth,lt'of U54l to a deflectlon
of 0 V.
Subsequently, apply a 30 7o modulated AM stgnal and adjust
rralrf of U547 for mlnlmum ouptt voltage on test polnt rtM5rt,
to be measured by means of an oscllloscope or mlllt-
voltmeter"
38,9MHz
36,8MHz
33.1MHz
25x /'0,9 M Hz
>500 x
38MHz
35MHz
33,1 MH z
> 320x
\
38,9MH z t
?l),--13!,17MHz 4o,gMHz
- -Y 10x ,500,
csz 706 8
Fig .7 >70 x

n D. seECIFIC SHRoMINANcE ADJusTMENTs (see Fig.3)
1. The sub-osclllator
Apply a colour slgnal and adjust the recelver to normal
setttng.
Connect an oscllloscope to polnt 9 of U563 vla an attenua-
tor probe (10 :1 ) .
Connect junctton 5561 /Caaa to chassls and lntercon-
nect the collector and emltter of TM43.
Adjust ''ab" of U563 for mlnlmum amplttude on the oscll=
loscope.
Remove the oecllloscope and adjust "ff ' of U563 so that
the colirur pattern ls practlcally statlonary.
The ldenttflcatlon clrcult
Apply a colour slgnal and set all controls of the recelver
to thelr normal posltlons.
a. By means of a slngle-beam oscllloscope:
Connect an oscllloscope to the collector of TS434
(measurlng polnt M23) and adjust 5556 for murlmum
amplltude (about 20 V p-p). Remove the oscilloscope
b. By means of a double-beam oscllloscope:
Connect the "beam A" lnput to the collector of TS434
(measuring polnt M23) and the "beam Bf ' lnput to
junctlon C732/C?33. Adjust S556 so that the Ilne
pulse colncldes wlth the maxlmum and the mlnlmum
value of the ldentlflcatlon slgnal (see Flg.9).
Remove the oscllloscoPe.
Fig 9
The colour AGC
- Appty a colour slgnat and set all controls of the recelver
to thelr normal Posltlons.
- Connect a valve voltmeter (1n;poslttron 10 V.:) to
jrrnctlon RL029/R1031 (measurlng polnt M"25rr) and
adjust "h,1" of 1J562 for mlnlmum meter readlng
(about 5 V).
Remove the voltmeter.
4a. The dela Ilne TD570 (wlth PM 5507)
Apply the ralnbow slgnal from the PI\{5507 and adjust
the recelver to normal settlng. Connect the rrbeam Bil
lnput of a double beam oscllloscope to junctlon Rll04/U575
(test polnt I'Ml9") and adjust the horlzontal tlme base
so that three perlods are dlsplayed (see Flgs.lOa and 10b).
F ig. 10o
2,
F is.11
F i9.12
When Flg. 10b ls obtalned, adjust R1103 so that Flg. 10a
arlses. Subsequently, connect the I'beam Arf lnput to
the collector of T5445 (test polnt 'rM18) and adjust the
horlzontal ttme base so that 2] perlods arlse (see Flgs.11
and 12). In these figures the sectlons lndlcated by means
of the clrcle are essenttal. Dlsplay one of these sectlons
on the oscllloscope by settlng the horlzontal amplltude
to x5 (lf necessary, use Xshlft). The oscllloscope rnav
now show one of Flgs. 13.
3.
Fig.13o Fig.13b
F ig .13c Fig. 13d
- If Flg. 13a ls dtsplayed both for the B-Y' (Flg. 11) and
for the R-Yt slgnal (Flg.L2\, the amplltude and phase
of the delay llne are correct and no further adjustment
ls necessary.
- If Flg. 13b ls only obtalned for the B-Yt slgnal, then
adjust V572 so that Flg. 13a 1s obtalned.
- If Flg. 13b ls obtalned both for the B-Y' and for the
R-Yt slgnal, then flrst adjust the core (crosshead) of
U569 so that Flg. 13a ls obtalned for the R-Yt slgnal
and adjustcUl72 so that thls td also obtalned for the
B-Y I slgnal.
- If Flg. 13d ls obtatned, flrst adjust.R1060 so that
Flg. 13b ls dlsplayed, Rrrther proceed as descrlbed
ln the precedlng sectlon.
- If Flg. 13c ls obtalned, adjust R1060 so that Flg. 13a
ls dlsplayed.
Fig.13c
csz7069
Fig.10 b

4b. The PAL dela IlneTDJ?q(wlth PM5506 or PM5508)
Set the generator to posltlon "Delay". Set the contrast and
the brlghtness to thelr normal posltlons, and set the
saturatlon control to 3/4 of tts range.
- If the thlrd bar shows the I'Venetlan bllnds?' effect,
elemlnate thts wlth R1060.
- If the flrst and second bars show the "Venetlan bllndrr
effect, ellmlnate thls wlth U569.
- Set the generator to posltlon f 'Colorlr Barr'.
Il the thlrd or the fifth bar.from the left (cyan and
magneta respectlvely) shows the I'Venetlan bllnds"
effect, ellmlnate this wlth U572. 6a.
- Set the generator to posltlon "Matrlxr'.
If the red bar shows the "Venetlan bllnds" effeet,
elimlnate thls wlth R1103.
Note: For photographs of the I'Venetlan bllnds" effect
reference ls made to the Dlrectlons for Use of
the colour pattern generator (PM 5506 - PM 5508).
5a. The sub-osclllator phase a
Check adjustments 1,2 and 3.
Apply the ralnbow slgnal from the PM 5507 and hrrn
contrast and saturatlon to ma>rlmum.
Connect a valve voltmeter (posltlon 30 V d. c. , posltive)
to polnt 3 of U562.
Apply a dlrect voltage of 5 V between junctlon R1029/
R1031 (test polnt ttM25") and chassls ("-f'to chassls).
Adjust th,1" and rrvil of U562 accurately to mzuctmum
meter deflectlon.
Remove the dlrect voltage and the valve voltmeter.
Interconnect polnts 4 and 5 (test polnts f 'M16" and f rMlTrr
respectlvely) of delay llne TD570.
Connect the Y lnput of an oscllloscope to polnt 3 of 8405
and the X lnput to polnt 3 of 840 3.
The oscllloscope now shows elllpses accordlug to one
of Ftgs .L4.
6b.
Fig.14 oFig.1l,b
Fig .11,c
hr these Flgs. one elllpse ls lndlcated wlth an lnterrupted
llne and one wlth an unlterrupted the.
Adjust the vldeo amplltude of the PM 5507 so that approx.
2.5 V ls obtalned ln the Y dlrectlon.
- If Flg. 14b ls obtalned, adjust ttvtt of u562 so that the
two elllpses preclsely coyer each other as shown ln
Fig. L4a.
- ff ftg.L4c ls obtalned, flrst adjuet traerf of U563 tuttll
the two elltpses colnclde (see Flg. 14b) and then adjust
f fv" of U562 untll Flg. 14a [s obtalned.
5b. The sub-osclllator and the burst- hase dl scr lm lnator
(wtth PM 5506 or PI\4 5508)
Set the geDerator to posltlon rrPhaseI and set all controls
of the receiver to thelr normal posltlons.
a. Adjust I'aerr of U563 unttl the lower part of bars 1 and
2 ls practlcally equal to the upper part of these bars.
b, Adjust t'vrrof U562 untll the Iower and the upper part
of the thhd bar are equal.
c. Repeat the adjustments mentloned sub a) and b) until
the Iower and the upper part of the flrst, the second
and the thlrd bar are equal.
The R-Y/B-Y demodulator and G-Y matrlx (wlth PM5507)
Check successtbely the above adjustments 1,2,4a
and 5a then adjustments 5-6 and 11 under the headlng
trAdjustments after repalrsr'.
Apply the colour bar pattern from the PM5507 and tune
the recelver carefully to the hlgher sldeband.
Turn contrast and saturatlon to maxknum and brlghtness
to mlnlmum. Set the hue control to lts mld-posltlon and
the black-whtte/colour swltch to rtcolour". Turn the
vldeo control of the PM 5507 to maxlmum. Connect an
oscllloscope to polnt 12 of 8419 (B-Y stgnal) and adjust
rrolr of U577 to 150 V, @eak-to-peak value). By means
of the saturatlon control decrease thls value to half
(75 V), then by adjusttng "oil of U577 lncrease lt agaln to
150 V.
Next adjust, ln turn, the contrast,brlghtness and satu-
ratlon controls for a normal plcture. Wlth the vertlcal
amplttude control of the oscllloscope adjust the peak-to-
peak value of the slgnal to 4 blocks. Measure the peak-
to-peak value of the voltage at polnt 11 of 8419 on the
oscllloscope and note lt. Next adjust the amplitude control
of the oscilloscope so that the peak-to-peak value of the
voltage at polnt 2 of 8419 corresponds to the value noted,
Connect the oscllloscope to_polnt 3 of B4t9 (R-Y slgnal)
and adjust "o" of U578 to 2{ blocks. Then connect the
oscllloscope to point 6 of 8419 and set the amplltude
control of the oscllloscope so that tle peak-to-peak value
ls the same as that prevlously noted.
Swltch off the red and the blue gun (wlth SKg and SK10
respectlvely) and set the black-whtte/colour switch to
rrblack-whlte". Adjust the brlghtness control untll the
green bars are just vlsible, then set the black-whlte/
colour swltch to rtcolourrr. Adjust R1125 so that on the
screen the 6th green bar from the rlght (there are 10 ln
total) just looses lts brlghtness. Connect the oscllloscope
to polnt 7 of 8419 (G-Y sfgnal) and adjust R1126 so that
the peak-to-peak value ls 1.4 blocks.
The R-Y/B-Y demodulator 4nd the c-Y matrtx (wlth
PM 5506 or PM 5508)
Thls adjustment can only be reallsed with the aid of the
modlfled I'Colour Bar" test pattern; in thls case the
upper part of the pattern ls made up cf colour bars and
the lower part of a white area. If thts should not be the
case. flrst refer to the converslon lnstructlons Cd 583
for generators PM 5506 and PM 5508.
- Check successlvely the above adjustments 1,2,4b
and 5b, then adjustments 5-6 and 11 under the
headlng trAdjustments after repalrsrt.
- Set the generator to posltlon "Colour Bar",
- Adjust the contrast and the saturatlon to maxlmum
and the brlghtness to mlnlmum.
Set the hue control to mld-posltlon.
- Cormect an oscllloscope to polnt 12 of the picture
tube (B-Y slgnal) and ailjust for 150 Vp-p wlth preset
I'orr of U5?7,
- Adjust the saturatlon control untll the voltage ls reduced
to 100 Vp-p.
- Adjust tlreset" "o" of U577 agaln to 150 Vp-p remove
the oscllloscope.
- Swltch off the red and green guns with SK9 and SK8
reepectlvely. Adjust the brlghtnese, the contrast and
the saturatlon so that there ts no dlfference ln bright-
ness between the four blue bare, and the tlue lower part
of the screen.
- Swltch on the red gun and swltch off the blue gun. If
requlred, a,iLiuiit ilrcset "oi'of IJ578 si;i;hat there ls no
dlfference ln b::1::ht;res: l:etrvct-'rr the four red bars and
the red Irler pirrl ol. the scrceil.
- S{.ttch on the glr:en grrn ard sq'itch rrlf the red gun. If
necessar]', adjrisr H1125 and Rli26 so that there ls no
dliference in brlghtness between the four green bars
and tht-; icrwcr grc*ln part cl the screen.
- Swltch on the r-ed and thc green gun agaln.
- Check adrrstment 5b.
csz7070

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