SABA ULTRA-ELECTRONIC P202 MICROMATIC CM FF142 CHASSIS 75236 000 30d UNITS VIEW.

- Video-Endstufe 75 236 013 00 (Video Final stage)

- Ton Modul 75236 012 00 (Sound Unit) TDA1035

Der TDA1035 ist eine monolithisch integrierte Schaltung. die alle Stufen
für den Tonkanal eines Fernsehempfängers enthält. Er ist geeignet für
netz- und batteriebetriebene Empfänger und ist eingebaut in ein Kunststoffgehäuse ähnlich T0-116 mit 13 Anschlüssen. Diese sind so geformt und angeordnet. daB die automatische Bestückung von Printplatten leicht durchzuführen ist. Die beiderseits aus dem Gehäuse herausragenden Kühifahnen sind ohne zusätzliche Kühlung ausreichend groß tür etwa 2W Ausgangsleistung. Werden die Kühifahnen zusätzlich gekühlt, z. B. dadurch. daB man sie in eine ausreichend große kuplerkaschierte Fläche
der Prlntplatte einlötet. so sind bis zu 4 W Ausgangsleistung erreichbar.

Der TDA1035 benötigt. wie aus den Bildern 2 bis 4 hervorgeht, nur weni-
ge externe Bauelemente. Er besteht aus einem begrenzenden ZF-Ver-
stärker. einem Kolnzidenz-Demodulator, einer Schaltung zur elektroni-
schen Lautstärkeelnstellung und einem kompletten NF-Verstärker mit
Vorverstärker, Treiber und Endstufe in Seriengegentakt-schaitung. Der
ZF-Teil hat gute Begrenzereigenschaften und eine hohe AM-Unterdrük-
kung. Der Koinzldenz-Demodulator liefert ein NF-Signai mit geringem
Klirriaklor. Für einen Anschluß an Videorecorder hat der TDA 1035 einen
direkten Demoduiatorausgang, der von der elektronischen Lautstärke-
einsteliung unbeeiniIuBt bleibt.

Für die Ansteuerung durch den NF-Ausgang eines Videorecorders oder
anderer NF-Signeiqueiien hat der TDA1D35 einen NF-Eingang, der von
der elektronischen Lautstärkeeinstellung beeinilußt wird. Durch eine
Schaitspannung kann der HF-Teii ausgeschaltet werden.

Der Endverstärker ist gegen thermische Überlastung geschützt. Bei etwa
150°C Krislailtemperatur wird die NF-Spannung am Treibertransistor
kurzgeschlossen.



- V.-Ablenk-Modul 75236 019 00 (Frame deflection unit) TDA1170

- Synchron-Regel-Modul 75236 015 00 (Synch and regulation stage unit) TBA920

- H.-Ablenk-Modul 75236 017 00 (Line deflection Output Unit)



TDA1170 vertical deflection FRAME DEFLECTION INTEGRATED CIRCUITGENERAL DESCRIPTION f The TDA1170 and TDA1270 are monolithic integrated
circuits designed for use in TV vertical deflection systems. They are manufactured using
the Fairchild Planar* process.
Both devices are supplied in the 12-pin plastic power package with the heat sink fins bent
for insertion into the printed circuit board.
The TDA1170 is designed primarily for large and small screen black and white TV
receivers and industrial TV monitors. The TDA1270 is designed primarily for driving
complementary vertical deflection output stages in color TV receivers and industrial
monitors.
APPLICATION INFORMATION (TDA1170)
The vertical oscillator is directly synchronized by the sync pulses (positive or negative); therefore its free
running frequency must be lower than the sync frequency. The use of current feedback causes the yoke
current to be independent of yoke resistance variations due to thermal effects, Therefore no thermistor is
required in series with the yoke. The flyback generator applies a voltage, about twice the supply voltage, to
the yoke. This produces a short flyback time together with a high useful power to dissipated power
ratio.




TBA920 line oscillator combination
DESCRIPTION
The line oscillator combination TBA920 is a monolithic
integrated circuit intended for the horizontal deflection of the black and white
and colour TV sets
picture tube.

FEATURES:
SYNC-PULSE SEPARATION
OPTIONAL NOISE INVERSION
GENERATION OF A LINE FREQUENCY VOL-
TAGE BY MEANS OF AN OSCILLATOR
PHASE COMPARISON BETWEEN SYNC-
PULSE AND THE OSCILLATOR WAVEFORM
PHASE COMPARISON BETWEEN THE OS-
CILLATOR WAVEFORM AND THE MIDDLE OF
THE LINE FLY-BACK PULSE
AUTOMATIC SWITCHING OF THE VARIABLE
TRANSCONDUCTANCE AND THE VARIABLE
TIME CONSTANT TO ACHIEVE NOISE SUP-
PRESSION AND, BY SWITCHING OFF, POS-
SIBILITY OF TAPE-VIDEO-REGISTERED RE-
PRODUCTION
SHAPING AND AMPLIFICATION OF THE OS-
CILLATOR WAVEFORM TO OBTAIN PULSES
FOR THE CONTROL OF DRIVING STAGES IN
HORIZONTAL, DEFLECTION CIRCUITS
USING EITHER TRANSISTORS OR THYRISTORS

 THE TBA920 SYNC/TIMEBASE IC It has been quite common for some time for sync separation to be carried out in an i.c. but until 1971 this was as far as i.c.s had gone in television receiver timebase circuitry. With the recent introduction of the delta featured 110°  colour series however i.c.s have gone a step farther since this chassis uses a TBA920 as sync separator and line generator. A block diagram of this PHILIPS /Mullard  i.c. is shown in Fig. 1.
The video signal at about 2-7V peak -peak is fed to the sync separator section at pin 8, the composite sync waveform appearing at pin 7.
The noise gate switches off the sync separator when a positive -going input pulse is fed in at pin 9, an external noise limiter circuit being required .
The line sync pulses are shaped by R1 /C1 /C2/R2 and fed in to the oscillator phase detector section at pin 6.
The line oscillator waveform is fed internally to the oscillator phase detector circuit which produces at pin 12 a d.c. potential which is used to lock the line oscillator to the sync pulse frequency, the control potential being fed in at pin 15. The oscillator itself is a CR type whose waveform is produced by the charge and discharge of the external capacitor (C7) connected to pin 14. The oscillator frequency is set basically by C7 and R6 and can be varied by the control potential appearing at pin 15 from pin 12 and the external line hold control. Internally the line oscillator feeds a triangular waveform to the oscillator and flyback phase detector sections and the pulse width control section. The coincidence detector section is used to set the time constant of the oscillator phase detector circuit. It is fed internally with sync pulses from the sync separator section, and with line flyback pulses via pin 5. When the flyback pulses are out of phase with the sync pulses the impedance looking into pin 11 is high (21(Q). When the pulses are coincident the impedance falls to about 150Q and the oscillator phase detector circuit is then slow acting. The effect of this is to give fast pull -in when the pulses are out of sync and good noise immunity when they are in sync. The coincidence detector is controlled by the voltage on pin 10. When the sync and flyback pulses are in sync C3 is charged: when they are out of sync C3 discharges via R3. VTR use has been taken into consideration here. With a video recorder it is necessary to be able to follow the sync pulse phase variations that occur as a result of wow and flutter in the tape transport system, while noise is much less of a problem. For use with a VTR therefore the network on pin 10 can simply be left out so that the oscillator phase detector circuit is always fast acting. A second control loop is used to adjust the timing of the pulse output obtained from pin 2 to take into account the delay in the line output stage. The fly back phase detector compares the frequency of the flyback pulses fed in at pin 5 with the oscillator signal which has already been synchronised to the sync pulse frequency.
Any phase difference results in an output from pin 4 which is integrated and fed into the pulse width control section at pin 3. The potential at pin 3 sets the width of the output pulse obtained at pin 2: with a high positive voltage (via R11 and R12) at pin 3 a 1:1 mark -space ratio out- put pulse (32/us on, 32/us off) will be produced while a low potential at pin 3 (negative output at pin 4) will give a 16us output pulse at  the same frequency. The action of this control loop continues until the fly- back pulses are in phase with a fixed point on the oscillator waveform: the flyback pulses are then in phase with the sync pulses and delays in the line output stage are compensated. The output obtained at pin 2 is of low impedance and is suitable for driving valves, transistors or thyristors: R9 is necessary to provide current limiting.