Instruction manual

ManualsBrandsAudio international ManualsAmplifierPA-7500A

Table of Contents

1720/1721

Power Sourc e 3--1.......................................................

Mains Frequency and Voltage Ranges 3--1....................................

Operating Options 3 --1...................................................

X Y INPUT Connect or 3--1...............................................

Auxiliary Connec tor 3--3..................................................

Mechanical Installation 3--4...................................................

Cabinetizing 3--4........................................................

Securing the Instrument in its Cabinet 3--6...................................

Rack Mounting 3--7......................................................

Custom Installation 3--9..................................................

Section 4 Theory of Operation 4--1.............................................

Overview 4--1..............................................................

Block Diagram 4--2.........................................................

Video Input 4--2.........................................................

Luminance Processing 4--2................................................

Microprocessor 4--2......................................................

Gain Cell 4--3..........................................................

Chrominance Processing 4--3..............................................

Demodulators 4--4.......................................................

Output Amplifiers 4--4...................................................

CRT Blanking 4--4......................................................

Circuit Descriptions 4--5.....................................................

DIAGRAM 1 INPUT AND DEFLECTION AMPLIFIERS 4--5.......................

Video Input Amplifiers 4--5...............................................

Gain Cell 4--6..........................................................

DIAGRAM 2 SUBCARRIER REGENERATOR 4--6...............................

Reference Switch 4--7....................................................

Luminance and Chrominance Amplifiers 4--8.................................

Sync Separa tor 4--8......................................................

Bowes Oscillator 4--8....................................................

Back Porch Sample 4--8..................................................

Loop Phase Detector and Amplifier 4--8.....................................

Quadrature Phase Detector and Amplifier 4--9.................................

Burst Clamp 4--9........................................................

Lock Detector and Bandwidth Switch 4--9....................................

Error Amplifier 4--9.....................................................

PAL Phasing 4--10........................................................

VCXO 4--10.............................................................

DIAGRAM 3 DEMODULATOR 4--11...........................................

V-Axis Switcher 4-- 11.....................................................

Chrominance Demodulators 4--12...........................................

Sync Tip Chromi nance Clamp 4--12..........................................

Demodulator Output Filters and Amplifiers 4--12...............................

Vector Center Dot Position Clamp 4--12......................................

DIAGRAM 4 DEFLECTION AMPLIFIER 4--13...................................

XY Input Amps 4--14.....................................................

Deflection Amplifiers 4-- 14................................................

Center Dot Comparators 4--14..............................................

CRT Blanking 4--14......................................................

DIAGRAM 5 MICROPROCESSOR 4--15........................................