Tektronix TDS 620A Manuale utente

Service Manual

TDS 620A, 640A & 644A

Digitizing Oscilloscope

070-8718-04

Warning

The servicing instructions are for use by qualified

personnel only. To avoid personal injury, do not

perform any servicing unless you are qualified to

do so. Refer to all safety summaries prior to

performing service.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes

that in all previously published material. Specifications and price change privileges reserved.

Printed in the U.S.A.

Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

WARRANTY

Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and

workmanship for a period of three (3) years from the date of shipment. If a product proves defective during this

warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor,

or will provide a replacement in exchange for the defective product.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration

of the warranty period and make suitable arrangements for the performance of service. Customer shall be

responsible for packaging and shipping the defective product to the service center designated by Tektronix, with

shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a

location within the country in which the Tektronix service center is located. Customer shall be responsible for

paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate

maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage

resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product;

b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any

damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been

modified or integrated with other products when the effect of such modification or integration increases the time

or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES, EXPRESS

OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’

RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND

EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.

TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL,

INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR

THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

     $/3("$  +2 ) 

 !)$ ,% ,+1$+10

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(01 ,%  !)$0 4(

 %$15 2** /5 4(((

-$"(%(" 1(,+0

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0$/ +1$/% "$ 7

%# &

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 &

(&+ ) ".2(0(1(,+ 501$* 7

,/(6,+1 ) 501$* 7

/(&&$/ 501$* 7

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  &

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)*,#'! '.#*('&', 2

')+!% $')+,) 1

%+!#+!&% (,!)$%+* 1

))%1#'! ' ',**-),#'! (/* 2

&.) % 1

&.)  1

)$!#'! '+,*-,#('+ 2

'+,%% ),#('+ 2

'*% )*,#'! '+,*-,#('+ 2

*' 1(-, 2

+# *(-*+ 2

&. +& &.) % 1

&. +& * #' 1

&. +& * +  ++,* %, 1

&. +& + ,%+!&%* 1

&. +& + &$'#/ ,%+!&%* 1

"(*1 ( )*,#('

#*-#, +*#),#(' 2

(!# ('.',#('+ 2

(-% .*.#/ 2

' *! *)/ )/.

      -1$ )0' 

 -!*-()  -$!$/$*)

-$ ! -* 0- . 3

 ) -' )./-0/$*). 3

*)1 )/$*). 3

 '!  ./. 3

Verify Internal Adjustment, Self Compensation,

and Diagnostics 4Ć4...................................

0)/$*)'  ./. 3

Verify All Input Channels 4Ć7...............................

Verify the Time Base 4Ć8...................................

Verify the Main and Delayed Trigger Systems 4Ć9.............

Verify the File System (Optional on TDS 620A and 640A) 4Ć11...

 -!*-()  ./. 3

Prerequisites 4Ć13.........................................

Equipment Required 4Ć14...................................

Test Record 4Ć17..........................................

$")' ,0$.$/$*) 2./ ( # &. 3

Check Accuracy of Offset (Zero Setting) 4Ć21..................

Check DC Gain and Voltage Measurement Accuracy 4Ć23......

Check Analog Bandwidth 4Ć29..............................

Check Delay Between Channels 4Ć33........................

$( . 2./ ( # &. 3

Check Accuracy for LongĆTerm Sample Rate, Delay Time,

and Delta Time Measurements 4Ć37......................

-$"" - 2./ ( # &. 3

Check Accuracy (Time) for PulseĆGlitch or PulseĆWidth

Triggering 4Ć40........................................

Check Accuracy, TriggerĆLevel or Threshold, DC Coupled 4Ć43..

Sensitivity, Edge Trigger, DC Coupled 4Ć46....................

0/+0/ $")' # &. 3

Check Outputs Ċ A X1 (for TDS 620A) or CH 3 (for

TDS 640A or 644A), Main and Delayed Trigger 4Ć51........

Check Probe Compensator Output 4Ć54......................

+/$*)  $ * -$"" - # &. 3

Check Video Trigger 4Ć59...................................

%0./( )/ -* 0- .

%0./( )/ -* 0- . 3

 ,0$- ( )/. !*-  -!*-() 3

Personnel 5Ć1............................................

WarmĆ p Period 5Ć1......................................

Access 5Ć2...............................................

System 5Ć2..............................................

" % %$*$*)

%$*$*)

Option l Peripher ls 5Ć2...................................

Test Equipment 5Ć2.......................................

) .

Performing the Adjustments 5Ć3............................

Complete Adjustment 5Ć3..................................

Individu l Adjustments 5Ć3.................................

P rti l Adjustment 5Ć4.....................................

Adjustment After Rep ir 5Ć4................................

Adjustment Dependencies 5Ć4.............................

'+ &#$* '+ ( .

!+)*#$* $)*(+* %$) .

H rdw re Inst ll tion 5Ć6..................................

Softw re Inst ll tion 5Ć7...................................

Softw reĆB sed Adjustments 5Ć7...........................

(% !+)*#$* %( *  (% .

Compens te the Probe 5Ć10................................

Me sure Probe B ndwidth 5Ć12.............................

Adjust the Probe Ċ High Frequency Response 5Ć14...........

 )&"- ))#"- !+)*#$* .

Brightness nd Contr st Adjustment

(TDS 620A nd 640A - Monochrome - Only) 5Ć18........

Rot tion, Brightness, nd Contr st Adjustment

(TDS 644A - Color - Only) 5Ć21.........................

 $*$$

 $*$$ $%(#* %$ .

(%+() %* $  ) * %$ .

(,$* $  .

Prec utions 6Ć2..........................................

Susceptibility to ESD 6Ć2..................................

$)&* %$ $ "$ $ .

$(" ( .

$)&* %$ $ "$ $ (%+() .

Inspection Ċ Exterior 6Ć6..................................

Cle ning Procedure Ċ Exterior 6Ć6.........................

Inspection Ċ Interior 6Ć7..................................

Cle ning Procedure Ċ Interior 6Ć8..........................

Lubric tion 6Ć8...........................................

#%," $ $)*""* %$ (%+() .

(&(* %$ / ") .

List of Modules 6Ć10.......................................

Gener l Instructions 6Ć10...................................

Summ ry of Procedures 6Ć10...............................

" % %$)$)(

     '+! $*" v

(( '%*' /

'%*'( %' -)'$" %*"( /

FrontĆP nel Knobs 6Ć17....................................

Line Fuse nd Line Cord 6Ć18...............................

EMI G skets 6Ć19..........................................

Re r Cover nd C binet 6Ć20................................

Front Cover, Trim Ring, Menu Buttons, nd Attenu tor P nel 6Ć23

A12 FrontĆP nel Assembly 6Ć25.............................

Displ yĆFr me Assembly 6Ć28...............................

C binet Modules 6Ć29......................................

'%*'( %' *)'/ ((!( %*"( /

A15 Attenu tor Assembly 6Ć31...............................

F n 6Ć32..................................................

A14 D1 Bus nd An logĆPower nd Digit lĆPower C bles 6Ć33..

A23 SerP r Bo rd Ċ RS232/Centronics H rdcopy Interf ce 6Ć35

A29 Video Trigger Bo rd 6Ć37...............................

A11 Processor/Displ y Bo rd 6Ć42...........................

Top Cover nd Bo rd Br ckets 6Ć44..........................

Re rĆP nel C bles 6Ć45.....................................

A10 Acquisition Bo rd 6Ć46.................................

Floppy Disk 6Ć48..........................................

Re r Ch ssis 6Ć50.........................................

'%*'( %' $$'/ ((!( %*"( /

A16 Low Volt ge Power Supply 6Ć52.........................

A20 or A30 Displ y Assembly nd Supply Fuse 6Ć53...........

Front Subp nel 6Ć58.......................................

M in Ch ssis 6Ć59.........................................

!(((#". %' "$!$ /

'%*"( %%)!$ /

!$%()!( /

!'#,' &)( /

  





  



  

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