MAINTENANCE
Section 5 -4 5 5 /A2/B2
This section contains information fo r use in preventive or corrective maintenance. The corrective maintenance portion
includes inform ation on component removal and replacement.
CABINET REMOVAL
W A R N I N G
Dangerous potentials exist a t several points inside this instrument. To prevent electrical
shock, do n o t touch exposed connections o r components when the instrument is operated
with the cabinet removed. Disconnect power before cleaning the instrument o r replacing
components.
The cabinet top can be removed easily fo r servicing or recalibration. Using a large coin, rotate the three circular locks clock
wise on each side o f the instrument until the slot is vertical, and lif t the cabinet top straight up.
PREVENTIVE M A IN TE N A N C E
Preventive maintenance consists prim arily of cleaning and visual inspection. When performed on a regular basis, preventive
maintenance w ill reduce instrument failure and improve reliability. The frequency of maintenance depends on the severity of
the instrument environment. The most convenient time to perform preventive maintenance is usually just prior to recalibra
tion. The following information in general, applies to all three modules in this oscilloscope.
CLEANING
The cabinet helps keep dust out of the instrument interior.
More frequent cleaning is necessary when the instrument is
operated w ith the cabinet removed. The fro n t cover helps
keep dust away from the fro n t panel and the crt face. The
fro n t cover should be installed when storing or transporting
the instrument.
Interior
Remove accumulated dust and d irt as often as operating
conditions require. D irt acts as an insulating blanket on
components, preventing efficient heat dissipation, which
can cause overheating and possible component breakdown.
It also provides an electrical conduction path that can cause
instrument failure, especially under high hum idity conditions.
The best way to clean the interior is to blow o ff the accu
mulated dust w ith dry, low-pressure air (approximately
9 lb /in 2 ). Remove any remaining d irt w ith a soft brush or
cloth dampened w ith a mild detergent and water solution.
A cotton-tipped applicator is useful fo r cleaning in narrow
spaces or fo r cleaning circuit boards.
REV. A, OCT 1975
5-1
Summary of Contents for 455
Page 1: ...Tektronix 455 A2 B2 PORTABLE OSCILLOSCOPE WITH OPTIONS I N S T R U C T I O N M A N U A L ...
Page 9: ......
Page 13: ...455 A2 B2 x 455 A2 B2 Portable Oscilloscope ...
Page 61: ...Circuit Description 455 A2 B2 Fig 4 4 Channel switching gates REV A OCT 1975 4 9 ...
Page 66: ...Fig 4 6 Sweep generator 1C Function block diagram Circuit Description 455 A2 B2 ...
Page 80: ...Maintenance 455 A2 B2 BOTTOM FRAME Fig 5 7 VO LTS DIV switch disassembly 5 8 REV A OCT 1975 ...
Page 90: ...Maintenance 455 A2 B2 Fig 5 13 Troubleshooting chart 5 18 REV A O CT 1975 ...
Page 91: ...Maintenance 455 A2 B2 1907 1 A Fig 5 13 Troubleshooting chart cont REV A OCT 1975 5 19 ...
Page 132: ...Instrument Options 455 A2 B2 Option 7 Page 8 REV E AUG 1979 D C TO AC I NVERTER ...
Page 166: ...l 07 7 REV b NOV C M1 4 5 5 MAIN MODULE BLOCK DIAGRAM ...
Page 167: ...4 5 5 A 2 B 2 AS VERTICAL MODULE IR07 R8 RE V B M O ...
Page 168: ...I S 0 7 9 8 R E V B NOV IRT7 A2 VERTICAL MODULE BLOCK DIAGRAM ...
Page 169: ...REV B NOV 1977 Fig 9 2 A1 Partial Interface board compo ...
Page 170: ...455 A2 B2 Sea Parts List for serial number ranges tial Interface board component locations ...
Page 173: ...v I m B 2 HORIZONTAL MODULE BLOCK DIAGRAM ...
Page 174: ...455 A2 B2 REV B NOV 1977 Fig 9 3 A 1 Partial Interface board component locations ...
Page 182: ...455 A2 B2 Fig 9 4 A20 Vertical board component locations SN B0110 ...
Page 185: ...455 A2 S2 4 5 5 M A fN M O DULE ...
Page 187: ...455 A2 B2 Fig 9 5 A20 Vertical board component location SN B010100 B REV C NOV 1977 ...
Page 191: ...V O L T S 01 ...
Page 192: ...V O LT S Q IV S H O W N IN 57 H V ...
Page 198: ... U 1 X SlCjMAt TO P2 A4 h o p it MODULE SEE PARTS LIST FOR SEMICONDUCTOR TYPES f SWITCHING ...
Page 207: ...A 1 4 B T I M I N G S W I T C H B O A R D A13 A TIM ING SWITCH BOARD 1 9 0 7 3 ...
Page 209: ...4 5 5 A 2 B 2 B 2 h o r iz o n t a l m o d u l e R o i I 11 R E V C NOV IS77 ...
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Page 214: ......
Page 216: ...A B T IM IN G S W IT C H INTERFACE C O N N E C T O R ...
Page 223: ... ...
Page 224: ...455 A 2 B 2 ...
Page 225: ... 455 A2 B2 ...
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Page 233: ......
Page 234: ...455 A2 B2 ...