nokia MONOPLUS110 Service Manual

STEREO CHASSIS

MONO PLUS

GB Service manual @ Service-Manual (32 Serviceanvisning

NOKIA

@I Manuel de service (I% Manuale di servizio

5556 6356

1995

7156

CONNECTING PEOPLE

Instructions for repair work N.6.: (cc. switch-model

Please use only original component 3447 00 04 for CO06. If standard size electrolyt capacitor COO6 is used, parallel 0,47 FF MKT must be installed additionally.

1. With the horizontal output stage disconnected (e.g. pin 8 at TK02 open) and a “dummy” load at the cathode of V031 (e.g. 100 W lamp) the power supply must supply approx. 100% of the setpoint voltage.

2. For fault finding the elect. fuse can be disconnected with a shunt connection across CO07. IF the electronic fuse cuts out due to a momentary overload, the TV set can be re-started by using the mains switch.

3. Make sure there is hum-free d. c. voltage available. For example: the ripple voltage of Ul is approx. 4 V and should, due to capacitance loss nf CO33. nnt increase much more. The rioole voltaoes of the other d.c.

_. ____, ..- _..._._ -__ ..-_.. ..-._.

voltages should be less than 1 V. The ripple voltages of U2, U3, U5 are in the mV range.

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Reparatutiips

Achtung! (betr. Schaltnetzteill

Fiir COO6 nur Originalteil 3447 00 04 verwenden. Bei handelsiiblichem Elko

COO6 mul3 parallel 0,47 FF MKT zusltzlich besttickt werden.

1. Mit abgetrennter Horizontalendstufe (z.B. AnschluB 8 an TK02 offen) und einer Ersatzbelastung an der Kathode von V031 (100 W Glijhlampe) muR das Netzteil ca. 100% der Sollspannung liefern.

2. Zur Fehlersuche bei Sicherungsbetrieb des Netzteiles kann COO7 iiberbrtickt werden. Wurde der Sicherungsbetrieb durch einen fltichtigen ijberlastfall ausgel6st. kann das Gerit durch Aus- und Einschalten des Netzschalters wieder in Betrieb genommen werden.

3. Auf brummfreie Gleichspannung achten. Z.B. die Brummspannung von

Ul liegt bei ca. 4 V und sollte, bedingt durch KapazitCtsverlust von

C033, nicht viel grdRer werden. Die Brummspannungen der ijbrigen

Gleichspannungen sollten unter 1 V liegen. Die Brummspannungen von U2, U3 und U5 liegen im mV-Bereich.

Consigli per le riparazioni

Attenzione! (circ. alimentazionel Utilizzare soltanto pezzo orig. 3447 00 04 CO06. Nei Elko COO6 reperibili in commercio deve essere ulteriorm. e montato un 0,47pF MKT.

1. Con lo stadio di uscita orizzontale staccato (ad es. collegamento 8 al TK02 aperto) e un carico di sostituzione al catodo di V031 (una lampada a 100 W), I’alimentatore deve fornire circa il 100% della tensione nominale.

2. Per la ricerca di errori in case di funzionamento di sicurezza del blocco dileeralimentazione, COO7 pub essere cavallottato. Se il funzionamento di sicurezza dovesse scattare a causa di un sovraccarico transitorio,

I’apparecchio pub essere rimesso in funzione azionando I’unterruttore principale d’inserzione e disinserzione.

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tensione di ronzio di Ul si trova a ca. 4 V e non dovrebbe aumentare di

molto, in dipendenza della perdita di capacite di C033. Le tensioni di ronzio delle rimanenti tensioni continue dovrebbero rimanere inferiori a 1 V. La tensione di ronzio di U2, U3, U5 si trovano nel campo dei mV.

Reparationstips

Ohs! lgiller switch-nltdelenl

Endast originalkomponent 3447 00 04 bBr anvlndas f6r CO06. Om en standard elektrolytkondensator anvlnds f6r CO06, m&ste en 0,47 FF MKT installeras parallellt.

1. Med horisontalslutsteget urkopplat (t.ex. stift 8 p8 TK02 ijppen) och konstbelastning (t.ex. 100 W lampa) pd katoden till V031, mlste nstdelen mata ca, 100% av den nijdvlndiaa soinninoen,

2. F6r felsijkning kan skyddskretsen kopplas ur funktion med en bryggkoppling Bver CO07. Om skyddskretsen utl6ser sig, beroende pa en tillflllig Bverbelastning, kan mottagaren kopplas pB pB nytt med nltbrytaren.

3. Anvtind endast filtrerad DC-spinning. Exempel: Beroende pB kapasitansfijrlusten aver C033, fdr brumniven pB Ul inte vara dver 4 V. Brumniven pd iivriga DC-splnningarna skall vara under 1 V. Brumniven pB U2, U3 och U5 Br i mV storlek.

Conseils de reparation

Attention! (bloc secteur de commutationl

Utiliser uniquement la pice originale 3447 00 04 (COO6). Dans le cas de condensateurs electrochimiques usuels COO6 0,47pF MKT doit etre equip6 en plus.

1. Lorsque 1’6tage final horizontal est dbconnectb (par ex. raccordement 8 sur TK02 ouvert) et dans le cas d’une charge de remplacement au niveau de la cathode de V031 (lampe B incandescence de 100 W) le bloc seteur doit delivrer 100% env. des tensions de consigne.

2. Pour la detection d’erreurs en fonctionnement de s&uritb du bloc secteur, il est possible de ponter CO07. Lorsque le fonctionnement de sDrete est d&lenchb B cause d’une surcharge transitoire, I’appareil peut gtre remis en marche au moyen du commutation principal mise en et hors circuit.

3. Veiller B la presence de tensions continues exemptes d’ondulation. La tension d’onduiation de Ui par exempie est de 4 V env. et ne devrait pas beaucoup augmenter en raison d’une perte de capacite de C033. Les tensions d’ondulation des autres tensions continues devraient toujours dtre infbrieures B 1 V. Les tensions d’ondulation de U2, U3, U5 se situent dans la gamme des mV.

Service adjustments

Note! Before other adjustments Ul voltage must be adjusted. If the set cannot be switched on with the number buttons, please see under “MODE” (Service menu 3).

Service mode

Select the service mode by pressing the Mute, OK (M) and TV buttons on the remote control unit. You can use the yellow button to call up Service Menu 23 or 4 (or Service Menu 1 again). Use the cursor button A or v to select required adjustment and adjust it by using the cursor buttons 4 and p. Store into memory by pressing the red OK (M) button. Return to normal TV mode by pressing the TV button.

Service adjustment which are made in service mode

DSD

4GC H-SHIFT

TXT Teletextcharacter sets: EASTIWESTMIESTTURK SCART

TXT H-SHIFT Adjust teletext picture horizontal to centre on the screen. APS Set to the appropriate television standard.

AUTOAPS

MODE

NICAM (ON/OFF) LOUDNESS (OFF=linerar frequency response) C4 CHECK CAR. MUTE (ON/OFF)

Adjustment Ul voltage

1. Set the contrast and brightness to minimum.

2. Connect test point XFOl (chassis board) to ground.

3. Go to service menu 1 (see service mode).

4. Use cursor button A or v to select Ul-adjustment.

5. Adjust the Ul voltage to 109.5 V + 0.5 V (14”, 17”, 20”) / 134.5 V f 0.5 V (21”) / 150 V f 0.5 (25”, 28”) with the cursor button 4 and p at test point x003.

6. Use the OK(M) (memory) button to store the value in memory.

7. Remove XFOl/ground connection again.

8. Return to normal TV mode by pressing the TV button.

AGC

1. Connect test point XFOI to ground.

2. Feed in RF signal without sound carrier with 70 dBuV on a medium UHF channel via the aerial input.

3. Go to service menu 1 (see service mode).

4. Use cursor button A or v to select AGC-adjustment.

5. Connect oscilloscope (bandwidth > 50 MHz) to the tuner’s IF output, test

point XL03 or XL04 and to ground XL02

6. Use cursor button 4 and) to adjust to 400 mVpp f 50 mV with

reference to the signal’s synchronizing peaks.

7. Use the OK (M) button to store the value in memory.

8. Remove XFOl/ground connection again.

9. Return to normal TV mode by pressing the TV button.

Note Service menu 1

Ul operating voltage, see adjustment “Ul voltage” See adjustment “AGC” Adjust centre of the test picture horizontal to a centred position. (Advice on set software)

Service menu 2

SCART socket, YES/l=When a switching voltage is being received at pin 8 (+I2 V), the set switches from standby to the “ON” operating status (programme memory location El). YES/S=as for YES/l; however, the set switches back to the standby operating status when the switching voltage fat pin 8) is switched off. This does not apply if you have changed programmE during operation.

NO=El cannot be selected.

Specifies APS sequence, e.g. first the BG standard, then L or L, and then BG.

Service menu 3

YES=APS; search function will be run automatically when the set is switched on for the first time and stores all stations in

memory. NO=No automatic search function when the set is switched on for

the first time.

l=NOKIA, SALORA 2=other sets

3=UNIVERSUM, MELECTRONIC

If the set cannot be switched on with the number buttons on the remote control, then switch the set on with the TV button and got

the service menu 3 (see service mode). Select the MODE setting and alter it to correspond your set. Store the setting in memory with the OK (MI button.

Service menu 4

(ON)

Other service adjustments

Horizontal amplitude

Adjust hor. amplitude to coil LK 12 ( 21”) or to resistor RK66 (25”. 28”).

Vertical amplitude

Adjust vertical amplitude to resistor RS20.

Vertical position

Adjust vertical position by severing resistor RS24 and/or RS14.

Pincushion distortion correction (25”. 28” 1

Adjust pincushion distortion correction to resistor RK60.

Focus

Use focus adjuster TK02 (at horizontal transformer) to set the focus to optimum sharpness.

1. Test picture with medium beam current, e.g. Fubeka or Philips test

picture. Contrast, brightness, colour saturation to ideal setting.

2. Determine the colour cathode with the highest blacklevel measuring pulse.

3. Use the G2 adjuster to set the measuring pulse to 140 V t/- 2 V.

AFC

1. Feed in symmetr. IF signal by means of 4:l transmitter at test points

XLO3/04 (BG, DK standard 38.9 MHz or the I standard 39.5 MHz; approx. 0.8 Vpp).

2. At test point XL01 (XL02 ground), set to 3.5 V DC f 0.5 V with coil ZLOl (AFC reference).

AFC check

Retune the IF signal to approx. 39 MHz (39.7 MHz); when you do this, the

voltage must drop to approx. 1 V.

Sound

The BG or I standards are independent of the STANDARD set. With the

BG/DK standard: STANDARD 2 = DK and STANDARD 3 = BG.

To set the STANDARD, proceed as follows:

1. Press the PROG button (RCF..Remote Control).

1. Press the blue button twice (RCN..Remote Control).

2. Select the menuline STANDARD.

3. Use the cursor button 4 and p to switch to STANDARD 3 or 2.

4. Use the OK (M) (memory) button to store the value in memory.

5. Return to normal TV mode by pressing the TV button.

Audio IF calibration

1. Feed in test picture

2. Connect oscilloscope at pin 12 of TDA2545A (stereo module).

3. Use coil ZA61 to calibrate to minimize video signal.

Audio IF calibration (Multinorm Modul)

1. Go to service menu 2 (see service mode).

2. Use cursor button A or v to select APS.

3. Use cursor button 4 and p to adjust to standard BG.

4. Connect signal generator 38.9 MHz (approx. 350 mV) to test points TP2/TP4.

5. Connect voltmeter to test point TP16.

6. Use coil ZL58 to calibrate the AFC D.C. voltage to 2.5 V + 0.5 V.

7. AFC check: If the IF is increased, the AFC voltage decreases.

8. Return to normal TV mode by pressing the TV button.

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