B&K 1477 Service Manual free download

File name 1477 Service Manual.pdf

jrfo Bi(F#C!S#J \,\ MANUAL SERVICE 1472C 1477 lSMHz Triggered Sweep DUAL-TRAGE OSqLLOSCOPE lllronn' Bt( \,\ WARilI1{G fhis service mantrcrl is intended for use W qnlified electronics teclnicions only. To arrcid electnc shock, do not perf orm servrcrng urless yvu are qnlified to do so. High voltage up to 2000 rfDC is present on the CRT and power supply board when tJle oscilloscope is operating. High voltage up to f95 VDC is present on the sweep board. Line voltage of LZO VAC (or 240 VAC) is present on the power transformer, on-off switch, and power supply board any time the oscilloscope is corurected to:ur AC power source, even if turned off. Always observe caution when the housing is removed from the unit. Contacting exposed high voltage could result in fatal electric shock. \- DIFFERENCE-S BETWEEN MODELS This second edition of the service manual is expanded to include Model t477. Electricaly, Model 1477 is very similar to the Model 1472C. A sep- arate schematic is supplied for eadr model. The circuit board drawings essentially apply to both models. Model L477 has several changes in ap- pearzrnce from Model l47ZC, using a new front panel, new handle, new knobs, etc. A parts list itemizing those parts which are unique for Model 1477 is on page 34. \- TABLE OF CONTENTS b OPERATOR'SCONTROLS'INDICATORS AND FACILITIES . . . . . . . . . . 3 S P E C I F I C A T I O N S . . . . . . . . . . . .. .. .. . . . . . . . . . . o o . . . . . . . . . . . 5 o C I R C U I T D E S C R I P T I O N . . . . . . . . . . . . . f. .. .. .. . . o . . . . . . . . . . . . 7 S E R V I C I N. G . . . . . . . . . . r . . . . . . . . . . o . . . . . . . . . . . . . . . o o . . . . . 8 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 AD JU STMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 P A R T SL f S T . . . . . . . . . . . . . . . . . . . . . . . . o . o . . . . . . . r r I r . . . . . , Z ! CIRCUIT BOARD MAPS PowerSuppIy... .27 V e r t i c a lm p l i f i e rr . . . . . . . . . . . . . . . . A . '... ... 28 S w e e p B o a r d. . . . . . . . . . . . . . o o . . . . . . . . o . o . o o o . . r . . . .