Technical Specifications:
I. CCIR Standards : Lines : 625
Picture IF : 38.90 MHz
Sound IF : 33.40 MHz
Video Bandwidth : 6 MHz
Inter carrier sound IF : 5.5 MHz
Channels : Band I : 1,3 and 4
Band III : 5 to 12
Aspect Ratio : 4:3
Type of Modulation : Negative
Picture : Amplitude modulation.
Sound : Frequency modulation.
II. No.of Stages:
1. Power supply (SOPS type)
2. Carrier IF with Hyper band Electronic Tuner
3. Sound IF
4. Sound Output
5. Video Processor
6. EHT Unit
7. Video Output
8. Sync Separate:
Video Indent:
(1) Separate vertical and horizontal signals.
(2) Using for mute.
9. Vertical Section:
Generate Ramp 50 Hz.
Generate Blanking for Blank the Retrace lines.
10. Color Section:
Crystal Oscillation:-
Color system : 4.43 MHz. Pal.
Method of Demodulation : Phase shift 90? and 180?
Demodulation as : R - Y and B - Y signals
Luminance: : Y amp.
11. Video Output as:
1. Red
2. Green
3. Blue.
12. BCL or ABL section:
Automatic bright level. This section adjusting focuses and beam lines. III. Types of circuits used:
PUPC Microprocessor : ST (4A - ST)
EPROM : 24CO2
Vision IF IC : TA 7680
Sound IF IC : TA 7680
Sound Output IC : TDA 2611
Video Processor : TA 7698
Vertical Output : Push pull type with
Transistor A940
Transistor C2078
Color Demodulate : Delay Line PF Type
Crystal : 4.43 MHz IV Power supply : Mains transformer type V Picture Tube : 20” Color
Fault Creating Points : 26 fault creating switches provided
with LED indication at fault sections. VI Cabinet : Metal cabinet.
Control panel and picture tube are
Connected through cable.
Size : 60 cm (H) x 60 cm(W) x 15 cm(D)
Weight : 8 Kg (approx.) Fault Creating Points at Various Stages. 1. AFT DETECTOR AFT SWITCH.
2. AGC CIRCUIT GAIN CONTROL.
3. SOUND IF 5.5 MHz. MUTE.
4. AUDIO AMP. AF SIGNAL
5. VIDEO AMPLIFIER BUFFER
6. VIDEO AMPLIFIER BLANKING.
7. SYNC SEPARATOR TOTAL SYNC.
8. VERTICAL SYNC. VERTICAL SYNCHRONIZING.
9. VERTICAL OSCILLATOR HEIGHT CONTROL
10. VERTICAL OSCILLATOR LINEARITY CONT.
11. VERTICAL OSCILLATOR RAMP GENERATOR
12. VERTICAL OUTPUT BLANKING.
13. VERTICAL OUTPUT INVERTER.
14. VERTICAL OUTPUT VERTICAL FAILURE.
15. HORIZONTAL SYNC. COINCIDENCE
16. WITH OSCILLATOR. DETECTOR.
17. HORIZONTAL OUTPUT INVERTER.
18. HORIZONTAL OUTPUT HORIZONTAL FAILURE.
19. LUMINANCE Y-AMP.
20. LUMINANCE CONTROL CIRCUIT.
21. CHROMINANCE ACC DETECTOR.
22. CHROMINANCE KILLER DETECTOR.
23. CHROMINANCE SATURATION CONTROL.
24. PEAK AMPLIFIER RED-Y-OUT.
25. PEAK AMPLIFIER GREEN-Y-OUT
26. PEAK AMPLIFIER BLUE-Y-OUT.
27. 4.43 MHz. OSCILLATOR CHROMO DEMODULATOR. |
