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