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STEREO CHASSIS MONO PLUS

25
G9 0 0 Manuel de service Manuale di servizio a a
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Service manual Service-Manual Serviceanvisning

NOK1A

._ 13755 v3

`3755 NICAM 3755 UK

5155 VT 5155 NICAM

STEREO CHASSIS MONOPLUS
58643002(BG,PAL,Scart,VT,14",90",NN) 5864 30 03 (BG,PAL,Scart,VT,NICAM, 5864 30 22 (BG,PAL,Scatt,VT,20",9O",NN) 58643023(BG,PAL,Scart,VT,NICAM,20",90,NN) 5864 33 43 (I,PAL,Scart,NICAM,14",90",NN) 14",9O",NN)

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Q Waveforms referenced to earth on TEA 2164 G pin 1 ect. I Osziilogramm-MeBpunk auf Masse an TEA 2164 G Pin 1 ect Tous le oszillogrammes se rappoltant au la masse TEA 2164 G pin 1.1 Riferire tutti gli oscillogrammi alla ma?.sa TEA 2164 G Pulser mitta mot TEA 2164G: jord, stifl 1.

SIGNAL-l PROCESSI

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Assembly group abbreviations/ Baugruppenkurzbezeichnungen Codlfica dei modulil DBsignatlons abr6gies des sous-ensembles Blockfijrkortningar D = Color decoder/ Decodificatore colore/ Fargdekoder K = Deflessione orizzontale/ Hor. deflection/ Horisontal avlankning S = Verticale/ Vertical I = AFI ZF/ HF L = IF/ MF/ F = Control unit/ Unita di comando/ Kontrollenhet A = Audio 0 = Power supply/ SchaltnetzteiY Circuit0 aliment. rete/ Natdel H = CRT. board/ BildrohrenanschluSl Colleg. cinescopio/ Bildrorsplattan R = VideotexW Teletext/ Televideo/ Text- TV

CRT. base board / BildriihrenanschluOplatte/ Connexion tube image / Collegamento cinescopio
58582051 (minineck) 58582050(narrowneck)

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Instructions

for repair work

N.B.: (cc. switch-mode) Please use only original component 3422 06 37 for CO06. If standard size electrolyt capacitor COO6 is used, parallel 0,47 uF 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 of C033, not increase much more. The ripple voltages of the other d.c. voltages should be less than 1 V. The ripple voltages of U2, U3, U5 are in the mV range.

[email protected]&Before other adjustments Ul voltage mu

32- and colour temperature
I. Turn the potentiometers RH24, RH34 and RH44 (CRT module) to anticlockwise stop. !. Switch the TV set to AV, or select a black test picture. 3. Connect an oscilloscope at the green input of the CRT module (XH02/2) 1. Select the brightness adjustment and adjust the black value to 1,7 V DC. 5, Short-circuit the test points XSO3/XSO4 (vet?. deflection). 3. Turn the UG2 adjuster (at the horizontal transformer) until a colour just appears as a bar. 7. Turn the potentiometer RH24, RH34 or RH44 until the bar just appears in white. At least one of the adjusters should remain at its anticlockwise stop. 3. Disconnect the test points XSO3/XSO4.

up Service Menu 2 or 3 (or Service Menu 1 again). Use the cursor button A or v to select required adjustment adjust it by using the cursor buttons 4 and ). Store into the memory by pressing the red M button. Return to normal TV mode by pressing the TV button.

and

Service adjustment
Adjustment Service menu 1 Uloperating voltage AGC Hor.position OSD

which are made in service
Note! See adjustment"Ul voltage" See adjustment"AGC" Adjust centre of the test pictureto a centredposition.

mode

AFC
1, Feed in a symmetrical IF signal by means of 4:l transmitter at test points XLO3/XLO4 (the 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 5 0.5 V with the 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.

Ul AGC H-SHIFT

Service menu 2 Teletext.hor.position TXT H-SHIFT Adjustteletext pictureto centre on the screen. WEST/EAST/WEST TURKEY Teletext.character sets TXT: SCART (yes/no) SCART NORM: Set to appropriateTV standard TV standard Service menu 3 NICAM LOUDNESS C4 BIT CHECK CAR.MUTE (on/off) (off=linerar frequencyresponse) (on) (on/off)

Sound
The BG or I standards are independent of the STANDARD setting. With the BGlDK standard: STANDARD 2 = DK and STANDARD 3 = BG. To select the STANDARD, proceed as follows: 1. Press the PROG button (under the lid). 2. Activate the STANDARD setting with the cursor button A or v. 3. Use the cursor button 4 orb to switch to STANDARD 3 or 2. 4. Use the M button to store the setting in the memory. 5. Return to normal TV mode by pressing the TV button.

Adjustment
1, 2. 3. 4. 5.

Ul voltage

Set the contrast and brightness to minimum. Connect the test point XFOl (chassis board) to the ground. Select the service mode (see Service mode). Use the cursor button A or v to select Ul adjustment. Adjust the Ul voltage to 109,5 V f 0,5 V (14", 17", 20") / 134,5 V * 0,5 V (21") with the cursor button 4 and b at test point X003. 6. Use the M button to store the value in the memory. 7. Disconnect the test point XFOl/ground again. 8. Return to normal TV mode by pressing the TV button.

Audio IF calibration
1. Feed in a test picture 2. Connect an oscilloscope at Pin 12 of TDA2545A (Stereo module) 3. Use coil ZA61 to adjust for minimum picture content.

Teletext decoder 5854 40 37
Adjust IC NR02 to 2,5 V k 0,l V with the coil LRl at Pin 28

AGC
1. Connect the test point XFOl to the ground. 2. Feed in a RF signal (70 dBpV) without sound carrier and tuned on a mid range UHF channel via the aerial input. 3. Select the service mode (see Service mode). 4. Use the cursor button A or v to select AGC adjustment. 5. Connect an oscilloscope (bandwidth >50 MHz) to the tuner's IF output, test point XL03 or XL04 and to ground XL02. 6. Use cursor button 4 orb to adjust to 400 mVpp * 50 mV with reference to the signal's synchronizing peaks. 7. Use the M button to store the value in the memory. 8. Disconnect the test point XFOl/ground again. 9. Return to normal TV mode by pressing the TV button.

Service Mode: i, M, PROG

Other service adjustments
Horizontal amplitude
Adjust horizontal amplitude with the coil LK12 (only 14" minineck and 21" picture tubes).

2!!!!!
PROG

Vertical amplitude
Adjust vertical amplitude by severing the resistor RS20.

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

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

4