HP Car 3490A manual Tpc, + l 0, G H Low G H Low H I G H L O W

Ralio Adjust- r4rap6 5-79.

lc W8 disconnected, pin 2 oi connetor

,ard U2 removed.set FUNCTION ro DC, to 10 V. Apply any INPUT voltag€ with h*n below, and apply I l0 V to TPC. bgaclevelsa! sh@n: lNote 2l

Monitor rcltage at W8 con- n*tor pin 5 while-spply- i n g + a n d - l o V a t ' T P A .

nedq pin 13 while apply- ing + ahd - 10 v .l TPA.

TPC

. 1 0v

+l 0 v

10v

- 1 0 v

T P D L O W LOW H I G H H I G H

U 5 ( 1 2 )

H I G H

LOW

L O W

H I G H

H I G H LOW H I G H L O W

Replace A13u4 or 5 as

indicated by prwious checka. Atter reFir, go to next step.

Voltage at pin 5 should b e + l 0 V a n d - 1 0 V r e - spectiwly,

Check 413U3 by subsri- tuting a ntu p6n. Ale cl€ck A13R9,tO arld feed- back cirdit A13R13 thru 16.

Volhge il pin 13 should b e + 1 V a n d - 1 V r 6 p 4 - tiwlv.

CheckAl3Bl 1A,8 d d A l 3 R 1 2 ,