Select Test 4. Set RATIO

s w i t c h - - t o

I N T R E F .

Conn4t

dc

shndard to

I N P U T

t e r m i n a l i a n d

apply - 10.0000 V. Display sbould b€ + (x).9995 I {'lO c o u n t s + d c a t a n d a r d qrorl.

With @nditions sme as

previous test,

ch4k logic

lewls 6

follows:

T6t

Point

Lowl

 

D

LOW

U 5 p i n 1 2

H l c H

U 5 p i n 1 1

H t c H

 

 

lNote 2l

NOTES

l.A dc standard and a dc wltreter are required for these check;.

2 . L o g i c H I G H = + 2 . 4 V r o 1 5 V Logic Low = 0 to + 0.6 V

3.Perform Ratio Adiustment Proce- dure after @mpleting repairs.

5 4 9 0 4 - D - l o a a

Remow A13U3, Set RATIO $itch to EXT REF 10 V. Ois@nnect dc standard from INPUT and con- net to EXT REF lerm- Monitor wltag€ at A13 test poinr C whil€ applying EXT REF wltages below:

EXT REF

TPC

+2 0 V + 1 3 . 6 r o + 1 4 . 3 V , 2 0 V - 1 3 . 6 t o - t 4 . 3 V

Refer to Gdffal Trouble- *r@ling Tree, Fig.7.4, min 34904 man@1.

Ch*k Input Prot@tion C i r c u i t A 1 3 c R t - 4 , A13Fl1-3. Afrer rep6ir, go to next step.

Replace A13l Dis@nned from EXT R net ro lNPt Apply - 10.00 TEST 4. Sh tqmimls. Wi rO EXT REF should be 0O.