1. OPERATORS SAFETY ME 1.1 Introduction...1-1E 1.2 Safety precautions ...1-1E 1.3 Caution and warning statement...1-1E 1.4 Symbols...1-1E 1.5 Impaired safety-protection...1-1E 2. INSTALLATION INSTRUCTIONS 2-1E 2.1 Initial inspection ...2-1E 2.2 Safety instructions...2-1E 2.2.1 Earthing...2-1E 2.2.2 Mains voltage cord and fuses...2-1E 2.3 Operating position of the instrument...2-2E 2.4 Rackmount version...2-2E 3. OPERATING INSTRUCTIONS 3-1E 3.1 Switching-on and auto-set ...3-1E 3.1.1 Switching-on...3-1E 3.1.2 Auto set...3-1E 3.2 Explanation of controls and sockets...3-2E 3.2.1 Introduction...3-2E 3.2.2 C.R.T. control area...3-4E 3.2.3 Up-down control area...3-4E 3.2.4 Function control area...3-5E 3.2.5 Potentiometer area...3-11E 3.2.6 Inputs and outputs...3-12E 3.2.7 Rear panel...3-12E 3.2.8 Application select menu...3-14E 3.3 Principle of operation...3-15E 3.3.1 Control section ...3-15E 3.3.2 Vertical deflection ...3-15E 3.3.3 Horizontal deflection ...3-16E 3.3.4 C.R.T. Display...3-17E 3.3.5 Power supply...3-17E 3.4 Brief checking procedure...3-18E 3.4.1 General information...3-18E 3.4.2 Entering the brief checking procedure ...3-18E 3.4.3 Brief checking of controls and functions...3-19E 4. PREVENTIVE MAINTENANCE 4-1E 4.1 General information...4-1E 4.2 Removing the bezel and contrast Filter 4-1E 4.3 Recalibration...4-1E 5. CHARACTERISTICS 5-1E 5.1 Display...5-2E 5.2 Vertical deflection or Y axis...5-2E 5.2.1 Channels A and B...5-2E 5.2.2 Triggerview...5-3E 5.3 Horizontal deflection X axis...5-4E 5.3.1 Main Time Base...5-4E 5.3.2 Delay Time Base...5-5E 5.3.3 X-deflection ...5-5E 5.3.4 EXT input...5-5E 5.4 Triggering...5-6E 5.4.1 MTB triggering...5-6E 5.4.2 DTB triggering...5-7E 5.5 Power supply...5-7E 5.6 Auxiliary in or outputs...5-7E 5.7 Environmental characteristics...5-8E 5.8 Safety ...5-9E 5.9 Accessories 5-10E 5.9.1 Accessory information...5-1OE 6. GLOSSARY OF TERMS 6-1E APPENDIX A A1 APPENDIX B B1

1. SAFETY INSTRUCTIONS 1-1 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 ... 2-3 2.2 Vertical deflections or Y axis ... 2-3 2.2.1 Channels A and B ... 2-3 2.2.2 Triggerview ... 2-5 2.3 Horizontal deflection or X axis ... 2-6 2.3.1 Main Time Base (MTB) ... 2-6 2.3.2 Delay Time Base (DTB) ... 2-6 2.3.3 X-deflection ... 2-7 2.3.4 EXT input ... 2-7 2.4 Triggering ... 2-8 2.4.1 MTB triggering ... 2-8 2.4.2 DTB triggering ... 2-9 2.5 Power Supply 2-9 2.6 Auxiliary input or outputs ... 2-10 2.7 Environmental characteristics ... 2-10 2 .8 Safety ... 2-12 3. INTRODUCTION TO CIRCUIT- AND BLOCK DIAGRAM DESCRIPTION 3-1 3.1 Introduction to circuit description ... 3-1 3.2 Block diagram description ... 3-10 3.2.1 Introduction ... 3-10 3.2.2 Control Unit 3-10 3.2.3 Attenuator unit ... 3-10 3.2.4 Pre Amplifier unit ... 3-10 3.2.5 Time-base unit ... 3-12 3.2.6 XYZ unit ... 3-12 3.2.7 Power Supply unit ... 3-13 4. ATTENUATOR UNIT (Al) 4-1 4.1 Vertical attenuators ...4-1 4.2 External input ...4-2 5. PRE Amplifier UNIT (A2) 5-1 5.1 Vertical pre Amplifier 5-1 5.2 MTB trigger pre Amplifier 5-2 5.3 DTB trigger pre Amplifier 5-3 5.4 Pre Amplifier control ...5-4 6. XYZ Amplifier UNIT (A3) 6-1 6.1 Introduction ...6-1 6.2 Final vertical (Y) Amplifier 6-1 6.3 Final horizontal (X) Amplifier 6-1 6.4 Final blanking (z) Amplifier and CRT ...6-2 7. TIME-BASE UNIT (A4) 7-1 7.1 Trigger Amplifier 7-1 7.2 Timing circuit ...7-2 7.3 Sweep Generator 7-4 7.4 X DEFL Amplifier and display mode switch ...7-6 7.5 Z Amplifier 7-6 7.6 Timing diagrams ...7-8 8. CRT Control Unit (A5) 8-1 9 Power Supply UNIT (A6) 9-1 9.1 Input circuit ...9-1 9.2 Converter circuit ...9-1 9.3 Secondary output rectifiers ...9-3 9.4 HT supply...9-3 9.5 Calibrator 9-3 10. FRONT UNIT (A7-A8) 10-1 10.1 Microcomputer control circuit ...10-1 10.1.1 Introduction to MAB8052 microcomputer ...10-1 10.1.2 Characteristics of the I^C bus ...10-1 10.1.3 I C structure ...10-2 10.1.4 Microcomputer MAB8052 ...10-3 10.1.5 I^C decoding ...10-4 10.1.6 Status input ...10-5 10.1.7 Probe indicator ...10-5 10.1.8 C-Bus decoder ...10-5 10.2 LCD display circuit ...10-5 10.3 Front-panel controls ...10-6 11. PERFORMANCE CHECK 11-1 11.1 General information ... 11-1 11.2 Preliminary settings ...11-2 11.3 Recommended test equipment ...11-2 11.4 Checking procedure ...11-3 11.4.1 Power Supply 11-3 11.4.2 Display ...11-3 11.4.3 Vertical deflection or Y-axis ...11-4 11.4.4 Trigger view ...11-10 11.4.5 Horizontal deflection or X-axis ...11-13 11.4.6 MTB triggering ...11-18 11.4.7 DTB triggering ...11-20 11.4.8 Auxiliary inputs and outputs ...11-22 12. DISMANTLING THE INSTRUMENT 12-1 12.1 General information ...12-1 12.2 Removing the top and bottom covers ...12-1 12.3 Access to parts for the checking and adjusting procedures ...12-1 13. CHECKING AND ADJUSTING 13-1 13.1 General information ...13-1 13.2 Recommended test and calibration equipment ...13-6 13.3 Survey of adjusting elements ...13-7 13.4 Checking and adjusting procedure ...13-9 13.4.1 Preparation ...13-9 13.4.2 Power Supply adjustment ...13-9 13.4.3 CRT display adjustment ...13-9 13.4.4 Square-wave response attenuator ...13-10 13.4.5 Adjustment of vertical sensitivities ...13-10 13.4.6 Adjustment of horizontal sensitivity ...13-11 13.4.7 Offset adjustments ...13-11 13.4.8 Adjustment of trigger sensitivity ...13-12 13.4.9 Adjustment of the MTB sweep times ...13-12 13.4.10 Adjustment of the DTB sweep times ...13-12 13.4.11 Adjustment of xlO sweep times ...13-13 13.4.12 Adjustment of delay time multiplier ...13-13 13.4.13 Square-wave response of final Y Amplifier 13-13 13.4.14 Checking the AUTO SET function ...13-14 14. CORRECTIVE MAINTENANCE 14-1 14.1 Replacements ...14-1 14.1.1 Standard parts ...14-1 14.1.2 Special parts ...14-1 14.1.3 Transistors and Integrated Circuits ...14-1 14.1.4 Static-sensitive components ...14-2 14.1.5 Handling MOS devices ...14-2 14.2 Removing the units and mechanical parts ...14-3 14.2.1 Attenuator unit (Al) ...14-3 14.2.2 Pre Amplifier unit (A2) ...14-4 14.2.3 XYZ Amplifier unit (A3) ...14-4 14.2.4 Time-base unit (A4) ...14-4 14.2.5 CRT Control Unit (A5) ...14-4 14.2.6 Power Supply unit (A6) ...14-5 14.2.7 Front unit (A7) and LCD unit (A8) ...14-6 14.2.8 Removing the delay line cable ...14-7 14.2.9 Replacement fo CRT ...14-7 14.3 Soldering techniques ...14-8 14.4 Instrument repacking ...14-8 14.5 Trouble shooting ...14-9 14.5.1 Introduction ...14-9 14.5.2 Trouble-shooting techniques ...14-9 14.5.3 Power-up routine ...14-10 14.5.4 Trouble-shooting the Power Supply 14-11 14.5.5 P.c.b. interconnections ...14-11 14.5.6 Signal waveforms ...14-16 14.5.7 Semi conductor pinnings ...14-16 14.6 Special tools ...14-16 14.6.1 Trimming kit SBC 317 ...14-16 14.6.2 P.c.b. snapper ...14-17 ■ 14.7 Recalibration after repair ...14-17 15. SAFETY INSPECTION AND TEST AFTER REPAIR AND MAINTENANCE IN THE PRIMARY CIRCUIT 15-1 15.1 General directives ...15-] 15.2 Safety components ...15-1 15.3 Checking the protective earth connection ...15-1 15.4 Checking the insulation resistance ...15-1 15.5 Checking the leakage current ...15-1 15.6 Voltage test ...15-2 16. PARTS LIST 16-1 16.1 Mechanical parts ...16-1 16.2 Units ...16-6 16.3 Cables and connectors ...16-7 16.3.1 Flatcables and connectors ...16-7 16.3.2 Pcb-connectors ...16-7 16.3.3 Miscellaneous cables ...16-7 16.4 Electrical parts ...16-8 16.4.1 Capacitors ...16-8 16.4.2 Resistors ...16-11 16.4.3 Coils ...16-16 16.4.4 Semi-conductors ...16-16 16.4.5 Integrated circuits ...16-18 16.4.6 Cathode ray tube ...16-18 16.4.7 Miscellaneous ...16-18 17. OPTIONS 17-1 17.1 Y-OUT ...17-1 17.1.1 Characteristics ...17-1 17.1.2 Circuit description ...17-1 17.1.3 Adjusting and checking procedure ...17-2 17.1.4 Parts list ...17-3 17.2 MTB gate, DTB gate and MTB sweep...17-6 17.2.1 MTB gate ...17-6 17.2.2 DTB gate ...17-6 17.2.3 MTB sweep ...17-6 17.2.4 Parts list ...17-6