Table of Contents
Advertisement
be wi thi n the l i m i t s 1 . 88 t o 2 . 1 2 amp s .
that movement i s n ot over one-hal f i nch, meas ured a l ong the per i phery of the d i sk .
T hi s i s c a l l e d a c ompens at i on check .
l i mi ts,
the fol l owi n g s teps
c ompen s at i on at No . 1 0 t i me d i al i s wi thi n l im i t s .
the res i stor .
Recheck comp e n s at i on after the res i stor adju s tment .
D I R ECT I ONAL UNIT
T he l ower jewel be ar i ng s hou l d be screwed al l the way i n u nt i l i ts head engages
the end of the threaded core suppor t .
about 1 /64 i n ch e n d p l ay i n the shaf t .
To check the c l e ar ance between the i ron core and the i n s i de of the r otor cup,
press down on the contact arm n e ar the s haft, thu s depres s i ng the s p r i n g-mou nted jewe l
u nt i l the cup s tr i kes the i r on .
S hou l d i t be nec e s s ary to remove the cup-type rotor from the d i r ect i on a l u n i t, the
fol l owi n g procedure shou l d be fol l owe d :
A l l l eads t o the u n i t shou l d f i rst be d i sconnected and tagged f o r i de nt i f i c a t i on
i n reconnect i ng .
T he u n i t c an then be remove d from the crad l e wi th i ts mou nt i ng p l ate
s t i l l attache d .
T he upper o f the three f l at-head screws ho l d i ng the u n i t to the p l ate shou l d n ow
be remove d .
O n s ome mode l s, i t m ay be neces s ary to remove a res i s tor o r c ap ac i tor t o
expose thi s screw .
removed, and the ent i re top structure l i fted off .
assembl y and exposes the s t ator assembl y, whi ch shou l d be protected to keep i t free
from dust and met al l i c p art i c l es u nt i l the u n i t i s reas sembl e d .
To remove the shaft an d r otor from the contac t he ad assembly, the s p r i ng c l i p at
the top of the shaft must be p u l l ed out and the c l utch adju st i n g screw t aken out of the
s i de of the mol ded contact arm . The sh aft and cup can n ow be pu l l e d out of the mol d i n g .
The rotor must be han d l ed very c arefu l l y whi l e i t i s out of the u n i t .
Contact Adj u s tme n t s
To f ac i l i t ate adju s tment o f contacts, remove the two red jumper l e ads from
termi n a l s 18, 1 9 an d 20 and use a neon i n d i c ati n g l amp i n ser i es w i th an AC vo l tage
s u pp l y across term i n al s 18 and 1 9 and 1 9 and 20 to s i g n i fy al l contact c l osures . R efer
to F i g . 19 and F i g . 18 for i dent i f i c at i on of barrel and l ow grad i ent contact p arts
respect i ve l y, and proceed as f o l l ows:
Loosen s l i ghtl y the screw whi ch secures the barrel back s top { l ocated at the r i ght
front corner of the u n i t ) to i ts support.
a l l ow the barrel to rotate i n i t s s l eeve but not s o l oose as to al l ow the s l eeve to move
w i thi n the su ppor t .
perm i tted to swi n g f reel y .
GEK-49849
I f the current f a l l s out s i de the 1 . 88 to 2 . 1 2 amp
shou l d be t ak e n :
T he shaft shou l d move about 1/16 i n ch.
The four corner screws c l amp i ng the u n i t together, shou l d next be
Unwi n d the barrel back stop so that the movi n g contact arm i s
Adju st the ten s i on of each l ow grad i en t contact bru s h
I f the d i sk moves at the l ower l i m i t, c heck
reset the control
The n restore p i ck u p by adjus t i n g
The upper be ar i ng shou l d be adju sted to al l ow
Thi s g i ves acces s to the cup
Thi s screw shou l d be only l oose enough to
2 5
spr i n g u nt i l
s o
Advertisement
Table of Contents
