BRUEL & KJAER 2619 Service Instructions Manual

B R D E L & KJ>ER
Naerum - Denmark
C o nsisting o f:
How to open th e P re a m p lifie r Type 2 6 1 9 , see e xp lo d e d v ie w . (2 6 1 9 .2 )
Tro u b le Sho oting
If the reason fo r a fa u lt is n o t an o b viou s one such as a fa u lty tra n s is to r, b ro ke n dow n resistor e t c . , th e n firs t test th e D C -v o lta g e s
and co m p are them w ith the v o lta g e s shown in the tables sheet 1 in o rd e r to lo c a liz e the d e fe c t. Should th is m e tho d o f fin d in g the
fa u lt p ro ve u ns u c c e ss fu l, then c h e c k the in s tru m e n t by a d ip tin g th e m e tho d d e s c rib e d in th e ad ju stm e n t p ro c e d u re . W hen th e tro u b le
has been fo un d an re m e d ie d , th e v o lta g e s and adju stm ents w h ic h are in flu e n c e d b y th e re m e dy must be re c h e c k e d .
The to le ra n ce s s ta te d in th e in s tru c tio n s can o n ly be used as a g u id e fo r a d ju stm e n t and c o n tr o l, but a n y d e v ia tio n s must not be co i -
re c te d w ith o u t b e in g sure th a t th e to le ra n c e s o f th e instrum ents used fo r m a kin g th e a d ju stm e n t are so sm all as to h a ve no in flu e n c e
on the m easurem ents.
The in s tru c tio n s in th is m anual are g iv e n p u re ly as a g u id e to th e s e rv ic e o f e q u ip m e n t w ith m in or fa u lts . Some fa u lts , as f . i n s t .
sm all d e v ia tio n s in to le ra n c e s re q u ire fo r th e ir c o r r e c tio n s p e c ia l c o n tro l e q u ip m e n t and e x te n s iv e e x p e rie n c e , and in these cases it
is necessary to send th e in s tru m e n t to th e fa c to r y .
Spare Parts
Please sta te ty p e - and s e ria l num ber o f app aratu s w he n spare parts a re o rd e re d .
Instrum ents N ecessary for S ervice and Repair
M u ltim e te r (50 pA )
Beat Freq ue ncy O s c illa to r ty p e 1022 (1013)
F requency A n a ly z e r ty p e 2107
P istonphone ty p e 42 20
2619 7.68
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Service Instructions
1/2" Preamplifier
E le c tro n ic S e ctio n 26 1 9.1
P ositio n o f C om ponents 2 6 1 9 .2
Parts List 2 6 1 9 .3
C irc u it D iagram 2 6 1 9 .4
2619