T r o u b l e . h o o r

F E T

 

 

 

 

 

 

 

 

sitchB

A10204,

205,

 

 

AlAl

TPA.

 

Repla@

2G, and 209 by m€suring

O

H O L D ,

 

gate-tosur@

voltages,

A1U2O2 in

ocks.

Wirh

ith

@p€

with Sample

Rate

set to

Sample

Rae

 

in

HOLD,

Conned

 

HOLD.

 

 

 

monitor

AiAITPA

with

 

 

 

A1c.207.

Volbg6

3hould be:

 

sp€.

(41C207

shortedl

 

l0

from

o2or

 

 

0 v

Adju$

AlAl

 

R210

 

 

 

h€

orher.

 

 

0205

 

 

-5 V

extrere

to

the

othor.

 

 

 

 

0208

 

 

0 v

 

 

TPA should

 

6ry

 

 

 

 

 

 

 

ozx,

 

 

ov

 

 

- 0.6 V

{fully

 

dl

b

DC

Zero

 

 

+ 0.6 V

(fully cil).

 

 

Perfo.m

Adjust-

 

 

 

 

runta,

Parag6ph

555,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

after repair.

 

 

Db@nnet

 

-5V

 

lrom

Remove

 

A1U2O2

from

A'lA1TPA and

@nned

 

ocket.

Connect

AITP

to

TPA to Ground,

 

 

 

 

Ground.

Conn@t

dc

 

null

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ffier

betreen

sure

 

of

Remve

41U2O1. Conned

A 1 O 2 O 7 A . n d s u r e o f

A1O2O7B. Volbge

ihould

dc

null

wltmter

b*wen

be

O

t

l0

mV.

lf

 

y6,

eur@

of

41O206A

and

 

adiüs

AlAt

 

R210

 

for

surce

of

AIO2OOB. Volt-

 

 

rclbgp

aa

n€r

 

z€ro

as

age should be 0 t

40 mV.

 

lf

y6,

adjus

AlAl

R210

rcsible.

M6sure gate-b-

for

bltage

at

n@f zslo as

s o u r c e

 

v o l t a g e

 

o f

posible.

M€aure gate-to-

A1O2OTA

and

g.

Gate

s o u r c e

v o l t a g e

o f

should b€

approx.

- 1.5 V

AlOZ)GA

end

B.

Gate

with

r6rd

 

to sure.

 

 

shoold b€ approx. -1.5Vwith rspoct to $wce.

Repla@ AlU2O2 with ns p6rt and pefform Dc zerc

Adiusmnts, Parag6ph

 

 

 

 

 

Redae A1O2O7 and per-

 

 

 

 

 

t o r m

D C

Z e r o

 

 

 

Replee AlU20l with new

 

Adiusrcnß,

 

ParagEph

 

 

 

 

5€s.

 

 

 

 

 

part and pertorm DC Zero

 

 

 

 

 

 

 

 

 

 

 

 

 

Adiu*tunts, Pe. 565,

 

 

 

 

 

 

 

Connet

dc null

mt6

 

 

F

Eint

 

bdwen

A'ITPR

and

 

 

 

Grourd. Volbge should be

 

 

.

i 0

v

 

 

0 r 3 0 m V .

 

 

 

 

 

 

 

 

 

 

 

tl/leere 6lbge at + Ref

Bt Fint on A2 with +digit DVM. Should be + t0 v t m.oo30 v.

Troubletr@t - Ret ilnffi- ing Ampl Figre 7-22.

DiiconnsctB@ffi6o

iump€r on A2. Conned

led from A1TPR to

6oI A2O1 (O1A s.te).

Conned anothff dip le6d

trom pin 3 of A2Ol (OtA to Ground. Measure

berw@n A1 TPR and g.ound with dc null

Mer. Should be 0 1 30 mV.

Adiust AlR522 from om extreme to the other. Volt- a!ß at AITPR rholld 6ry

a p p r o x i m a t e l y f r o m + 30,mV b - g) mV.

Troublerhoot DC Ampli. tier. S€e Paragraph 7-16.

asritly. Sa Pa.agEph

?-14. Al$ se PaEgraph 7-16.

Tror6le*r@t + Ret Sutr ply. FigureT-22. Se PaE" gtzpl\ 7 -24.

Troubleshoot DC Amdi- tift. Sa PaEgräph 7-l 6.

Figure7-5. DC AnalogTroubleshootingTree.
7-r317-1