Nokia 7291SM Service Manual

SALORA

UXOR

SCHAUB WREN2

7291 28F8

dent-No. 5439 47 20 :OC) Ident-No. 5439 47 40

UK) Ident-No. 5439 98 40

8291

dent-No. 5439 46 70 :OC) Ident-No. 5439 47 00

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dent-No. 5430 82 80 dent-No. 5439 46 50 :OC) Ident-No. 5430 83 20 :OC) Ident-No. 5439 46 60 UK) Ident-No. 5430 83 00

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Schaltbilder/ Ers.-Teile/ Abgleich/ Rep.-Hilfen

3lockschaltbilderl Block diagrams >hassis-Schaltbildl Chassis diagram CCU-RF 1\V-Eingangsplattel AV in connector board Chassisplatte/ Chassis board 3ildrbhrenplatte/ Picture tube board aed.-Teilplattel Control unit board Displayplatte/ Display board Kopfh.-Platte/ Headphone board IR-Sender/ IR transmitte NICAM-Tonmodull NICAM audio module Video-ZF-Mod& Video IF module Audio submodule

Ident-No. 5439 47 60 (U) Ident-No. 5430 04 10

32F8

36F8

Ident-No. 5439 46 30

STB...15-22

STB-CCU...23-24

STEL...25-26

STB...27-30 STH...31-34

SCS-sTS...35-44

SCS...3644

EESTUL...36-39

STEJ...45-48

STEQ...50-51

E...ll-14

SCS...36

STD...49

7128 7128

Ident-No. 5439 48 00

8228

Ident-No. 5439 47 80

9128

(LX) Ident-No. 5439 46 40 Ident-No. 5439 46 20

Circuit diagr./Repl. parts/Adjustment@epair work

Tuner AV-ModuV AV module PIP-Modull Picture-in-picture Einstellanweisung Adjustment

Intructions de reglage lstruzioni di regolazione

Service mode

PAL! SECAM/ NTSC Einstelltabellel List if adjustments Rep.-Hilfe/ Instructions for repair work

Ident-No. 5439 47 90

8228

Ident-No. 5439 47 70

9128

SK0...52

sTSS...53-55

STQM...56-66

ADJ/l...63-65 ADJ11...66-66 ADJ/l...59-61

ADJ/ll...73-75

ADJ/ll...76 ADJ/ll...77-78 ADJ/ll...76-72

REP...79

Ersatzteiie/ Replacement parts

Baugruppen-Ubersichtl Moduie tabuiar summary

Ersatzteilei Replacement parts

Achtung I Bei Reparaturen gijltige Sicherheitsvorschriften beachten !

Warning I Service and repair work to be performed only in armrdance with existing safety regulations I

Anmtlon ! En faisant des reparations tenez compte des prescriptions de skurite ! Anenzlone ! Osservare Ie norms di sicurezza vigenti in case di riparazioni !

Rbntgenverordnung: Die in der Rontgenverordnung festgelegte Ortsdosisleistung ist bei diesen Geraten durch die Bildrohrentype und die maximal zulassige Hochspannung gewahrleistet.

X-ray regulations: The picture tube type and the maximum permissible high-voltage ensure that the X-ray intensity within the set remains far below the permisstble value. ,

Mglementatlon portant cur les rayons X: La puissance de dose locale fixbe dans la kglementation relative aux rayons X es4 garantie dans le cas de cet appareil Q&e au type de tubs-image et 1 la haute tension maximale admissible. Regolamento raggl x: La potenza prevista dall disciplina raggi X per quest0 geners di apparecchio viene garantits dal tip0 di cinescopio e dalla tensfone massima consentita.

SchutzmaOnahmen fur MOS-Bauelemente beachten !

MOS Respecter les mesures de protections pour les composants de MOS !

Bei Nachbestellungen von Manualen bitte Geratetyp und Gerate-ldentnummer angeben. When re-ordering manuals, please quote the model name and part number.

En cas de commande supplementaire de manuels veuillez indiquer le typ et le numero

de l’appareil. Per riordinare i manuali, indicare il modello dell’apparecchio ed il numereo categorico.

Pay attention to protective measures for MOS components ! Osservare le misure protettive per gli elementi costruttivi MOS !

Oszillogramm-MeBpunkt / Waveforms measuring point Tous les oscillogrammes / Riferire tutti gli oscillogrammi

6611 75 27 (9209)

kderungsn vorbehalten / Modifications reserved I Modifications r&e&es / Con riserva di modifiche

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Adjustment procedure for 16:9 TV sets

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General

The adjustments of the receiver are performed with a remote control handset. Only focus and G2 adjustments are potentiomter adjustments. The settings have been distributed among 16 adjustment planes. The usual colour and geometry adjustment routines are performed in 5 adjustment groups on adjustment planes 1 - 7. Every adjustment group has its own separate adjuster buttons, which trigger different adjuster functions, depending on the adjustment plane you are currently on (NOKIA/SALORA/LUXOR/SCHAUB LORENZ Fig. 3 /

Page 72). The digit display blinks during adjusting until the extreme value is reached.

The adjustments are performed in service mode.

Adjustments required for different standards

Certain adjustments must be made for each standard separately on the respective programme position. When the TV is in normal mode, select the menu display to check the programme standard. In order to adjust different standards you have to preset such a standard to a programme position (e.g. programme position 1: PAL, programme position IO: SECAM etc.). The tables ( Page 77-78) shows the adjustment values to be used with each colour system and standard.

Service mode

Access to the service mode is obtained by switching on the receiver with the mains switch within 6 seconds: (Fig. 1 - Page 76/N.B.! Note the type of remote control handset involved !). The display shows the programme memorys version (01...79). Depending on the type of remote control handset you have , the following buttons are operative in service mode: (NOKIA/SALORA/LUXOWSCHAUB LORENZ Fig. 3 / Page 72)

Q, and by keying in the following command

Option bytes

The TV configuration is determined with option bytes. These byte settings are effective on all programme positions when not otherwise stated (NOKIAISALORAILUXOWSCHAUB LORENZ Fig. 3/ Page 70-71). An option byte consists of 8 bits.The state of each bit is indicated by the corresponding segment in the right-hand digit display. The state of each bit can be toggled with numeric keys 0 to 7. If the segment lights up, corresponding bit is set to “1”. The effect of option bytes is not visible until returning to the TV mode !

Detailed description of how to adjust colour and geometry, Using the adjusting table (NOKIA/SALORA/LUXOR/SCHAUB LORENZ Fig. 3 ! Page 70-72)

Geometry adjustments must be carried out completely after replacement or initialization of memory IC X24C16P (ICB 50). The following order of adjustments has been found to produce the desired result with the minimum of effort. Adjustments can also be made in another order or completely separately. Upon completion of adjustments the settings can be stored all with a single depression of the memory key (MENU or OK/->M) before leaving the service mode.

Exception

Grey scale adjustments have to be stored separately on adjustment group S/adjustment plane 5 or 6.

Selecting another programme position is possible in the middle of an adjustment. Non-memorized adjustments are not retained if the

new programme position has different adjustment values (e.g. another colour system).

SA Colour oscillator synchronization: Adjust the colours “upright” ( Adjust. plane 1 /Adjust. group 3 ) dL Luminance delay: For adjustment use an external RGB source and video signal in MIX mode. Select programme position 0. Apply the

R signal to EXTI input pin 15 and video signal to EXTl input pin 20. Connect the Fast Blanking pin 16 to R input pin 15 at the EXT socket, Adjust the RGB and video pictures to the same position ( Adjust. plane 1 /Adjust. group 2 )

dC Chrominance delay: Using RF test picture, adjust the colour transition to the same position with the luma transition (Adjust plane

Adjust. group 4 )

Note: If there is no DTI circuit in the system, perform the whole adjustment with ud ! Coarse adjustment of dL and dC without external RGB signal: Adjust dC to the maximum with, then decrease 10 steps. Adjust dL to

same phase.

1 /

ud Chroma/luma delay (DTI or no DTI): Adjust ud to align the colour transient to the position of the luminance transition ( Adjust. plane

/Adjust. group 4 )

SP Horizontal centering: Center the picture with SP. If the adjustment is not possible, check dL adjustment ( Adjust. plane 7 /Adjust.

group 1 1

Note: It helps picture centering if the centre point of the screen is marked on the tube e.g. with a piece of tape.

A0 Vertical shift: Adjust the top border of test pattern ( Adjust. plane 2 /Adjust. group 1 ) HO Picture height: Adjust the bottom border of the test pattern the amount of half a square beyond the screen ( Adjust. plane 2 /Adjust

group 2 )

SO Vertical linearity: Adjust the bottom border of test pattern (Fig. 4 / Page 69) ( Adjust. plane 2 /Adjust. group 3 ) Cl Pincushion distortion correction 2: Depending on the remote control handset type involved, use the AUDIO button (NOKIA) or W

( SALORA) or -

to increase by three steps (Fig. 5 / Page 69) ( Adjust. plane 3 /Adjust group 5 )

5 :’

rapezium distortion correction 2: Depending on the remote control handset type involved, use button

( SALORA) or 44 ( LUXORSCHAUB LORENZ) to stretch the picture far enough to render the bending points (summing points Kl and

K2) clearly visible (Fig. 6a / Page 69). At this juncture, pay no attention to the picture distortion ( Adjust. plane 3 /Adjust group 4 )

( LUXOWSCHAUB LORENZ) to adjust to the extreme value (picture distortions will occur!), then use VIDEO or b

0 (NOKIA) or 44

Kl Summing point 1: Adjust summing point Kl to position shown in Fig. 6a (2,5 squares from top). It may be necessary to adjust Zl too

( Adjust. plane 4 /Adjust group 7 ) (Fig. 6a + 6b I Page 69)

K2 Summing point 2: Adjust summing point K2 to position shown in Fig. 6a (2,5 squares from bottom). It may be necessary to adjust 21

260

224:

2250

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273!

2131

(Gair

255:

817:

306

onvolvec

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blu’ = Maxin

Maxin

too ( Adjust. plane 4 /Adjust. group 2 ) (Fig. 6a + 6b / Page 69)

Zl Trapezium distortion correction 2: Adjust the lines between the summing points as straight as possible; adjustment usually at

minimum ( Aausf. plane 3 / Ac$ust. group 4 ) (Fig. 6a + 6b / Page 69)

ZO Trapezium distortion correction 1: Straighten the vertical lines at the upper half of the picture without paying attention to what

happens to the lower half of the picture ( Adjust. plane 3 /Adjust. group 2 ) (Fig. 6a + 6b / Page 69)

CO Pincushion distortion correction 1: Straighten the vertical lines at the lower half of the picture. Vertical lines can be straightened by

alternately adjusting 20 and CO ( Adjust. plane 3 /Adjust. group 3 ) (Fig. 5 + 6b / Page 69)

YO Picture width: Adjust the top corners to correct position ( Adjust. plane 3 /Adjust. group 1 )

CO Pincushion distortion correction 1: Check the position of the bottom corners. If the picture is not straight between the summing

points, check Cl and 21 adjustments ( Adjust. plane 3/Adjust. group 3 )

St DTl start time adjustment: Use normal RF signal. Adjust the transients of colour bars to the same postion as the transitions of B/W

picture ( Adjust plane 4 /Adjust. group 4 )

Sp DIT stop time adjustment: Use normal RF signal. Adjust the transients of colour bars to the same position as the transitions of BNV

picture ( Adjust. plane 4 /Adjust. group 5 )

Grey Scale Adjustments G2 Screen grid voltage: Adjust brightness and contrast to minimum. Adjust G2 trimmer of the potentiometer unit on the tube base panel.

Adjustment is correct when neither of the dot LEDs are illuminated in the display. At the same time, the most efficient gun is clamped to a reference level (cut off voltage approx. 150 V), which is fixed at the lowlight adjustment and cannot be adjusted ( Adjust. plane S/Adjust.

group 7 )

CT, CG, cb Black level adjustments: Increase contrast to a level where picture is slightly visible. The gun which was set fixed at G2

adjustment can be found at adjustment in which both dot LEDs are illuminated i.e. black level of this particular colour cannot be adjusted. Adjust the grey scale of test pattern to grey by changing the black level of the two remaining guns ( Adjust. plane 5 /Adjust. group

1+2+3 )

dr, dG, db Highlight adjustments: Measure with an oscilloscope at the bases of transistors TH 13, TH 23 and TH 33 to check which

colour channel has the maximum preset gain. Leave the oscilloscope to the appropriate base and adjust contrast control for a reading of 60 V from black level to white. Disconnect the oscilloscope. Adjust for normal brightness (all grey bars are discernible) ( Adjust. plane 6 /Adjust.

group 1+2+3 )

If the picture is too

red, decrease red with dr adjustment until white parts of test pattern turn to white;

green, decrease green with dG adjustment until white parts of test pattern turn to white;

blue, decrease blue with dB adjustment until white parts of test pattern turn to white.

Check black level adjustments. If you have to adjust these, then check the highlight adjustments too.

Note: Grey scale adjustments must be stored on adjustment group 5/adjustment plane 5 or 6 with the key MENU or OK/-rM.

Other Adjustments HA Horizontal adjustment of text page: Center the teletext page within the screen. At the same time also menus and screen displays are

shifted ( Adjust plane 7 /Adjust. group 7 )

CA Relative contrast of menus: Adjust the contrast of menus, screen displays and teletext (only MIX mode) relative to the contrast of

normal picture ( Adjust. plane 7iAdjust. group 2 )

CL Maximum contrast of teletext page: Adjust the contrast of test pattern to mid-position, then adjust white characters of text for equal

brightness to the white in the test pattern ( Adjust. plane 7/Adjust group

3 )

PH Centering the PIP screen ( Adjust. plane 74 ) PA Colour oscillator sync. of PIP screen: Adjust the colours “upright” ( Adjust. plane 14 )

Note: The PH and PA adjustments are missing if there is no PIP module in the set.

Focus adjustment

Set contrast close to maximum and brightness for a well balanced grey scale. Adjust focus to optimum using the Focus potentiometer of the trimming unit on the tube base panel.

IC identification

On adjustment planes 12 and 13, you can check which ICs are connected to the PC and the bus respectively This feature can also be utilized for fault finding (NOKIAISALORA/LUXOFt/SCHAUB LORENZ Fig. 3 / Page 70-71)

IC replacement

X24C16P Memory IC ICB 50 (= STB / IC 50): If you suspect that some adjustment value prevents the set from starting up

replace the memory IC with one which is O.K. and contains sufficient initializing values - e.g. preprogrammed spare memory IC (Fig. 7 /

Page 62)

NVM 3060 EEPROM memory ICBM 1

lnitializing memory ICs ICB 50 and ICBM 1 : lnitializing replaces the values stored in memory IC ICB 50 with new ones (from ICB 2). The

picture will not be perfect when using the initialized values.

1. Disconnect the mains plug.

2. Switch the TV on with the mains switch.

3. Reinsert the mains plug and within 6 seconds press the following buttons consecutively (depending on the type of remote control handset involved): (NOKIA) MUTE / m / m / or ( SALORA) II / I / b / lb or (LUXOWSCHAUB LORENZ)

+/l /I,/,,/.

The TV is switched on to programme position 1 after initializing. Channel 24 and PAL B/G standard will have been stored on all programme

positions. After initialization check the options and perform all adjustments.

+ 14 hidden pages