Aeroflex ATC-1400A-2 - Page 8

MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 8
Subj e c t to E x p o rt Co n t r o l, s e e Cover P a ge f o r d etai l s . Feb 2 / 0 9
STEP PROCEDURE
7. Veri f y v olt a g e dis p l a y ed o n D i gita l M u l timete r i s 4.9 V d c (± 0 . 0 5 V) . I f no t ,
adju s t R9932 a s fo l l o w s :
WARNING: THE FRONT AND REAR P A N E L A S S E M B L I E S C A R R Y 120 OR
240 VAC POTE NT I A L W H E N T HE POWER CORD IS CONNECTED
TO THE ATC-1400A-2 A N D E X T E R N A L AC POWER SOURCE. D O
NOT CONTACT THESE OR ANY ASSOCIATED COMPONENTS
DURING CALIBRATION.
● Set A T C - 1 4 0 0 A-2 P OW E R S w i t c h to O F F .
● Disco n n e c t ac p o w e r co r d f rom AC I N P U T C o n nect o r .
● Remove t h e bott o m c o v er f r o m t h e AT C - 1 4 0 0A-2 a c c ord i n g to t h e
disa s s e mbly p r o c e dur e i n 2-3 - 1 D ( 1)(a ) .
● Recon n e c t ac p o w e r cor d t o AC INP U T C o n n ect o r .
● Set A T C - 1 4 0 0 -2A P OW E R S w i t c h to O N .
● Adju s t R 9 932 ( + 5 V A d j u stment ) t h rou g h t he s ma l l a dju s t m e n t hol e o n th e
unde r s i d e of t h e AT C- 1 4 0 0 A-2 ( d i rect l y u nde r n e ath t h e Powe r S uppl y
Asse mb l y ) , as n e e d ed f o r 4.9 V d c (±0. 0 5 V).
8. S et AT C - 1 4 0 0 A-2 P OW E R S w i t c h to O F F .
9 Remove Mic r o p roce s s o r PC B o a r d As s e m b ly ( 2 - 2 -2, F i g ure 2 5 ) part w a y out o f
Card Ca g e Ass e m b l y . Dis c o n nec t D i git a l M u l timet e r l ead s .
10. Rein s t a ll Mic r o p roce s s o r PC B o a r d A s s embly i n Card C a g e Ass e m b l y .
11. Set POWE R S w i t ch t o O N . Veri f y A TC-14 0 0 A - 2 fr o n t pan e l d isp l a y s are i n
acco r d a nce w i t h powe r - u p se l f t est i n 2-2- 4 , Tab l e 5 5.
12. Con n e c t Dig i t a l Mult i m e t e r po s i t ive l e ad t o P /J7 1 0 1 , pi n 1 and n e gat i v e lea d t o
P/J7 1 0 1 , pin 2 . Refe r t o J7 1 0 1 (2-2 - 2 , Fig u r e 26) o n V ide o A s sembly .