MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 2 3
Subj e c t to E x p o rt Con t r o l, s e e C o ver P a g e fo r d e tail s . F e b 2/ 0 9
STEP PROCEDURE
9. Usin g O s c ill o s c op e s t art a n d s t o p co n t rols , c ros s l eadi n g and t r ail i n g edg e o f P
1
puls e a t 50% p o int ( 2 - 2 -2, F i g ure 3 2 ) . V e r i f y pu l s e widt h i s 0. 8 µs (±5 n s ) .
Adju s t R 2 603 ( X P D R P ulse W i d th A d j u st) ( 2 0 0 MHz Con t r o l PC B o a r d Ass e m b l y )
(2-2 - 2 , Figu r e 2 6) a s n e ede d f o r pr o p e r res u l t s.
7503002
XPDR P
1
Pul s e w i th L e a ding a n d Tr a i l ing E d ges C r o s s ed a t 5 0% P o i n ts
Figu r e 32
10. Set XPDR P U L S E W I D TH VAR/CAL S w i t c h to V A R a n d XPDR PULSE W I D T H
Thu mbwh e e l s t o 0 . 20
µ
s. V e r i fy p u l s e wid t h is 0 . 2 µs (±5 n s ) .
11. Set X P D R P U L SE W I D T H T h umbwheels t o 1.8 5
µ
s. V e r i fy p u l s e wi d t h is 1 . 8 5 µs
(±5 ns ) .
12. Set XPDR P U L S E W I D TH VAR/CAL S w i t c h to C A L . Ver i f y XPDR p u l s e sp a c i n g
disp l a y ed o n Oscil l o s cop e f o r X P D R M ODE Co n t r ol i s w i thi n t o ler a n c e a s
foll o w s :
SETTING PULSE SPACING
Mode 1 3.0 µs (±5 n s )
Mode 2 5.0 µs (±5 n s )
Mode T 6.5 µs (±5 n s )
Mode A/ Mo d e 3 8.0 µs (±5 n s )
Mode B 17.0 µs ( ±5 n s )
Mode C 21.0 µs ( ±5 n s )
Mode D 25.0 µs ( ±5 n s )
13. Set SLS/E C H O O N / OFF Swit c h to ON. Ver i f y P
1
to P
2
pul s e spa c i n g i s 2 µs
(±5 ns ) .
14. Set XPDR P
2
/P
3
DEV T h u m b w h e els t o 1.85 a n d XPDR DEV P
2
/CAL S w i t c h to
+
∆
. Ve r i f y P
1
to P
2
pul s e spa c i n g i s 3 .85 µs ( ±5 ns).
15. Set XPDR P
2
/P
3
DEV T h u m b w h e els t o 0.90 a n d XPDR DEV P
2
/CAL S w i t c h to -
∆
.
Verif y P
1
to P
2
pul s e spa c i n g i s 1 .10 µs ( ±5 ns).
16. Step X P D R P
2
/P
3
DEV T h u m b w h e els f r o m 0 . 90 t o 0 .00
µ
s an d v erif y P
1
to P
2
puls e s pac i n g ste p s fro m 1 . 1 0 to 2 . 0 0 µs i n 0 .05 µs s t e p s.
17. Set XPDR DE V P
2
/CAL S w i t c h to +
∆
and s t e p XP D R P
2
/P
3
DEV T h u m b w h e els
from 0. 0 0 t o 1. 8 5
µ
s. V e r i f y P
1
to P
2
pul s e spac i n g st e p s fro m 2 . 0 0 to 3 . 85 µs
in 0 . 0 5 µs st e p s .
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