Magnum PF21500, Service Manual

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3.2.3 The chassis mainly uses the following ICs and assemblies.
P o s i t i o n T y p e D e s c r i p t i o n
1 N 2 0 1 A T 2 4 C 1 6 E E R P O M
T D A 1 1 1 X X P S M i c r o p r o c e s s o r , M O N O - 9 0
/ M O N O 1 1 0 V e r s i o n s f o r 9
0 ° / 1 1 0 °
p i c t u r e t u b e s
2 N 2 0 2
T D A 1 2 1 X X P S M i c r o p r o c e s s o r , A V - 9 0 / A V - 1 1 0
V e r s i o n s f o r 9
0 ° / 1 1 0 ° p i c t u r e
t u b e s
` 3 N 6 0 1 T F A 9 8 4 2 A J A u d i o p o w e r a mp l i f i e r
T D A 4 8 6 4 A J / T D A 4 8 6 3 A J
4 N 3 0 0
T D A 4 8 6 5 A J
F o r U l t r a - s l i m C R T
5 N 8 0 1 F S C Q 0 7 6 5 S w i t c h - m o d e p o w e r s u p p l y c o n t r o l
TA F 5 - C4 I 2 3 I F 3 8 M H z t u n e r
T A F 5 - E 4 I 2 2 I F 3 8 . 9 M H z t u n e r
6 A 0 0 1
T A F 5 - U 2 F 2 2 I F 4 5 . 7 5 M H z t u n e r
3. SERVICE DATA
4.1 TV signal processor T D A 1 1 1 X X series
4.1.1 GENERAL DESCRIPTION
The various versions of the T D A 1 1 1 X X /TDA121XX series combine the functions of a video processor
together with a -Controller and US Closed Caption decoder. Most versions have a Teletext decoder on board.
The Teletext decoder has an internal RAM memory for 1 page text. The ICs are intended to be used in economy
television receivers with 90and 110picture tubes. The ICs have supply voltages of 8 V and 3.3 V and they are
mounted in an SDIP-64 envelope.
The features are given in the following feature list.
4.1.2 FEATURES TV processor
Available in T D A 1 1 1 X X versions
·
Multi-standard vision IF circuit with alignment-free PLL demodulator
·
Internal (switchable) time-constant for the IF-AGC circuit
·
The mono intercarrier sound circuit has a selective FM-PLL demodulator which can be switched to the
different FM sound frequencies (4.5/5.5/6.0/6.5 MHz). The quality of this system is such that the external
band-pass filters can be omitted.
·
The FM-PLL demodulator can be set to centre frequencies of 4.72/5.74 MHz so that a second sound channel
can be demodulated. In such an application it is necessary that an external band pass filter is inserted.
·
Integrated chrominance trap circuit
·
Integrated luminance delay line with adjustable delay time
·
Picture improvement features with peaking (with switchable centre frequency, depeaking, variable
positive/negative overshoot ratio and video dependent coring) and blue- and black stretching. All features
are available for CVBS, Y/C and YPBPR signals.
·
Tint control for external RGB/YP
B
P
R
signals
·
Integrated chroma band-pass filter with switchable centre frequency
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