Zenith Z-100 Series, User Manual

Page: 96 / 150

Page 4-4
• Ref e r t o I l l u stration Book, Page 4, Detail 4-2B
a nd turn th e to p c ase so the four l o c k i n g p i n s
are pointing up ,
•
Connect the VOM's leads to two of the locking
pins, as shown in D etail 4-2B, and measure the
resistance.
If you m easure 1000 ohm s or l e ss, the cabinet
a lready has a m e t al l i zed coating an d y o u w i l l
not have to replace it.
I f you m easure an i n f i n i t e r esistance, you w i l l
h ave to replace the cabinet parts, (Refer to th e
chart at the beginning of this section.)
N OTE: In t h e f o l l o w i n g t e st , yo u w i l l u s e a V O M
( volt-ohmm eter) t o m e a s ur e t h e r e s i stance o f t h e
cabinet's top case. If you measure 1000 ohms or less,
t he cabinet parts are already coated wit h a shi e l d i n g
m etallic coating. But if the VOM i n d i c a tes an infi n i t e
resistance, you wil l h ave to replace the top case, base
a nd center c abi net p a rt s w i t h n e w o n e s t h a t h a v e
a shielding coating on t h em . If th e cabinet parts are
not shielded, th e C o m p u ter m a y c a use serious RFI
( Radio Frequency Interference) problems du r in g op -
eration.
T his c o m p l e te s t h e " Replacement T e s t s" . Y o u
should now k n o w w h i c h m o d i f i c a t i ons are required
o n the C o m p u t er . T h e c h ar t o n P a g e 4- 1 l i s t s t h e
p art num b ers for m an y o f t h e n e w p a r ts. A f ter y o u
h ave all of the parts required, proceed to " M o d i f i c a -
• Set th e V O M t o m e a sure resistance, and so you
can easily read 1000 ohms.
tions."