1 SAFETY INSTRUCTION t - 1 1.1 INTRODUCTION...1 - 1 1.2 SAFETY PRECAUTIONS...1 - 1 1.3 CAUTION AND WARNING STATEMENTS...1 - 1 1.4 SYMBOLS...1 - 1 1.5 IMPAIRED SAFETY-PROTECTION...1 - 2 1.6 GENERAL CLAUSES...1 - 2 2 CHARACTERISTICS 2 - 1 2.1 DISPLAY...2 - 2 2.2 VERTICAL DEFLECTION OR Y AXIS...2 - 2 2.3 CHANNELS A AND B...2-2 2.4 EXTERNAL INPUT...2 - 4 2.5 HORIZONTAL DEFLECTION OR X AXIS...2 - 4 2.6 MAIN TIME BASE...2 - 4 2.7 EXTERNAL HORIZONTAL DEFLECTION...2 - 5 2.8 TRIGGER MTB...2 - 5 2.9 BLANKING OR Z AXIS...2 - 6 2.10 Calibrator 2 - 6 2.11 Power Supply 2 -6 2.12 ENVIRONMENTAL...2 - 7 2.13 SAFETY...2 - 8 3 BLOCK DIAGRAM DESCRIPTION 3 - 1 3.1 VERTICAL DEFLECTION...3 - 1 3.2 HORIZONTAL DEFLECTION...3 - 2 3.3 Power Supply 3 - 2 4 CIRCUIT DESCRIPTION 4-1 4.1 VERTICAL DEFLECTION...4 - 1 4.1.1 Attenuator...4 - 1 4.1.2 Preamplifier...4-1 4.1.3 Intermediate Amplifier 4-1 4.1.4 Y-out Amplifier 4-1 4.1.5 Vertical switching circuit...4 - 1 4.1.6 Vertical output Amplifier 4 - 2 4.2 HORIZONTAL DEFLECTION...4 - 2 4.2.1 Trigger Amplifier 4-2 4.2.2 Trigger Generator 4-2 4.2.3 Main time-base; (MTB) sweep Generator 4 - 3 4.2.4 Horizontal switching circuit...4 - 3 4.2.5 Horizontal output Amplifier 4 - 4 4.3 CRT CIRCUIT...4-5 4.3.1 Z-axis Amplifier 4-5 4.3.2 CRT control...4-6 4.3.3 HV supply...4 - 6 4.4 Calibrator 4 - 6 4.5 Power Supply 4 - 7 PERFORMANCE CHECK AND ADJUSTMENT PROCEDURE 5 - 1 5.1 GENERAL INFORMATION...5-1 5.2 RECOMMENDED TEST AND CALIBRATION EQUIPMENT...5 - 4 5.3 PERFORMANCE CHECK AND ADJUSTMENT PROCEDURE...5 - 5 5.3.1 Power Supply low voltage...5-5 5.3.2 Power Supply high voltage...5-5 5.3.3 Power consumption...5-5 5.3.4 CRT intensity adjustment...5 - 5 5.3.5 CRT focus adjustment...5-5 5.3.6 CRT astigmatism adjustment...5 - 6 5.3.7 Vertical step balance adjustment...5 - 6 5.3.8 Vertical x5 MAG balance adjustment...5 - 6 5.3.9 Vertical variable gain balance adjustment...5 - 6 5.3.10 Vertical gain...5-6 5.3.11 Vertical x5 MAG gain...5-7 5.3.12 Channel B invert adjustment...5 - 7 5.3.13 ADD balance adjustment...5-8 5.3.14 Low frequency response adjustment...5 - 8 5.3.15 High frequency response adjustment...5 - 8 5.3.16 1 kHz square-wave response adjustment...5 - 8 5.3.17 Input impedance adjustment...5 - 9 5.3.18 Dual A and B, polarity inversion channel B...5 - 9 5.3.19 ADD facility...5-9 5.3.20 Vertical bandwidth...5-10 5.3.21 Trigger DC balance adjustment...5 - 10 5.3.22 Y-out DC balance adjustment...5 - 10 5.3.23 Y-out gain adjustment...5 - 10 5.3.24 X-gain adjustment...5 - 11 5.3.25 Triggering adjustment...5 - 11 5.3.26 Trace starting point adjustment...::...5 - 11 5.3.27 X-Y centering adjustment...5 - 11 5.3.28 Horizontal bandwidth...5 - 12 5.3.29 Z input...5-12 5.3.30 MTB deflection coefficients...5 - 12 5.3.31 Sweep length adjustment...5 - 13 5.3.32 x10 MAG time adjustment...5-13 5.3.33 x10 MAG centre balance adjustment...5 - 14 6 DISMANTLING THE INSTRUMENT 6 - 1 6.1 GENERAL INFORMATION...6 - 1 6.2 REMOVING THE TOP- AND BOTTOM COVERS...6 - 1 6.2.1 Removing the top cover...6-1 6.2.2 Removing the bottom cover...6 - 1 6.2.3 Remounting the covers...6-1 6.3 ACCESS TO PARTS FOR CHECKING AND ADJUSTING PROCEDURE...6 - 2 7 CORRECTIVE MAINTENANCE 7 - 1 7.1 REPLACEMENTS...7 - 1 7.1.1 Standard parts...7-1 7.1.2 Special parts...7 - 1 7.1.3 Transistors and integrated circuits...7 - 1 7.2 REMOVING AND REMOUNTING THE UNITS... ...7 - 2 7.2.1 Removing the vertical PCB...7-2 7.2.2 Removing the horizontal PCB...7 - 2 7.2.3 Removing the cal and control PCB...7-3 7.2.4 Removing the mode PCB...7 - 4 7.2.5 Removing the CRT...7-4 7.2.6 Replacing the text plate...7-5 8 SAFETY INSPECTION AND TEST AFTER REPAIR IN THE PRIMARY CIRCUIT 8 - 1 8.1 GENERAL DIRECTIVES...8 - 1 8.2 SAFETY COMPONENTS...8 - 1 8.3 CHECKING THE PROTECTIVE EARTH CONNECTION...8 - 1 8.4 CHECKING THE INSULATION RESISTANCE...8 - 1 8.5 CHECKING THE LEAKAGE CURRENT...8 - 1 8.6 VOLTAGE TEST...8 - 2 9 PARTSLIST 9 - 1 9.1 MECHANICAL PARTS ...9 - 1 9.2 UNITS...9 - 12 9.3 CABLES AND CONNECTORS...9-12 9.4 ELECTRICAL PARTS...9 - 13 9.4.1 Special capacitors...9-13 9.4.2 Trimmer capacitors...9-14 9.4.3 Special resistors...9 - 14 9.4.4 Trimmer resistors...9-14 9.4.5 Potentiometers...9 - 15 9.4.6 Diodes...9 - 15 9.4.7 Transistors...9-17 9.4.8 Integrated circuits...9-19 9.4.9 Miscellaneous...9-20 10 CIRCUIT DIAGRAMS + PCB LAY OUTS 10 - 1