MAI NTENANCE MANUAL
ATC-1400A-2
2-2-2
Page 1 1
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
(3) CAL MARKS
PREREQUISITES : 2-2- 2 D ( 1 ) P ower S u p p l y
TEST E Q UI P ME N T : 1 F r e quenc y C o u n ter
2 50 Ω Coa x i a l Cabl e s (BNC to B N C )
SET-UP DIA GRAM: None
NOTE: Dur i n g per f o r mance o f t his p r o cedu r e , if a c ert a i n co n d i tio n o r sp e c i fic a t i on
cann o t b e ve r i f ied, r e f er t o a ppro p r i a te a s sembly t e s t pr o c e dur e i n 2-2 - 4 for
test i n g an d r e pai r o f fa u l t y as s e m b l y.
STEP PROCEDURE
1. Set A T C - 1 4 00A- 2 c o ntro l s a s fo l l o ws:
CONTROL SETTING
CAL Ø Cont r o l CCW
1.0 µs/1. 4 5 µs Swit c h 1.45
µ
s
PRF/SQTR ON/OFF S w i t c h OFF
PRF/SQTR T h u m b w h e els 0000
FREQ/FUNCTI ON S E L E C T Thumbwhee l s 1000 X P D R
2. Connec t F requ e n c y Coun t e r to CAL MA RK S C o n nect o r (J19 ) .
3. S e t POWER S w i t c h to ON. A l low a 1 0 m i n ute w a r m - u p per i o d .
4. Ver i f y fre q u e ncy d i spl a y e d on F r equ e n c y Cou n t e r is 6 8 965 5 H z (±34 H z ) .
5. S e t CAL MARK S S w i t c h t o 1 . 0
µ
s.
6. Ver i f y fre q u e ncy d i spl a y e d o n F r equ e n cy Co u n t er i s 1 MHz (±50 H z ) .
7. Remove F r e q uenc y C o u nter f r o m CAL MARKS Con n e c tor ( J 1 9 ). C o n n e ct
Oscill o s c o pe t o C A L MARKS Conn e c t or ( J 1 9 ) . S e t 1 .0 µs / 1.4 5 µs S w i t c h to
1.45
µ
s.
8. Ver i f y pu l s e widt h d isp l a y ed o n O s cil l o s cop e i s 0. 4 5 µs at 5 0 % poi n t . Ad j u s t
R218 ( X P D R P u lse P C B o a rd A s s e m b l y) (CA L M A R K P u l se W i d t h Contr o l )
(2-2 - 2 , Figu r e 2 5) a s n e ede d f o r pr o p e r pul s e w i dth .
9. Conne c t O s c ill o s c ope E x t erna l T rigg e r to S Y N C C o n n ect o r .
10. Set P R F / SQTR Thu mbwh e e l s to 2 0 0 0, P R F / S Q T R ON/OFF Swit c h t o ON and
T
O/TAC/TD Sw i t c h to T O .
11. Al i g n lea d i n g ed g e o f fi r s t pul s e on l e f t -mos t v e rti c a l gra t i c ule. V a ry CAL Ø
Contr o l and v e rify p u lse s m o v e a mi n i m u m o f 36 0 °.
12. Set POWE R S w i t ch t o O F F .
13. Dis c o n nec t t e st e q u ipment .
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