SERVICE

MODEL 8559A

Observe 1 s t L.O.

Source o f FM 1s n a i n c o i l Tune D r i v e r

0II

Replace Tune YES

Voltage w i t h

Source o f FM i s

FM/Main C o i l

I s o l a t e YTO Main C o i l Tune D r i v e r

I s o l a t e YTO FM C o i l D r i v e r

1

Source o f FM i s YTO FM

C o i l D r i v e r

0I0

FM?

NO

Replace -1OV

R e g u l a t o r w i t h

B a t t e r y

Ir

Source o f

FM

NO

i n -iOV

 

II.

 

R e g u l a t o r

 

0

 

I s o l a t e YTO

Source o f FM

Main C o i l

i s FM/Main

F i x e d D r i v e r

C o i l S w i t c h

Source o f FM

NO

 

i s ~ a i nc o i l F i x e d D r i v e r

019

in T u n e / F u l l Span Voltage

LEOEND FOR INFORMATIO N BLOCKS

Text A n n o t a t i o n

Schematic B l o c kReference Reference

Step I n s t r u c t i o n goes h e r e .

1I a o l a t e.YTO Main c o i l F i l t e r

+fpq

YES

ISource o f FMd i s YIG-Tuned

O s c i l l a t o r . A6

FIGURE 8-26,RESIDUALFM TROUBLESHOOTINGFLOWCHART