PS Magazine - TB 43-PS-430
PS, The Preventative Maintenance Monthly
ISSUE 430
SEPTEMBER 1988
Printed CIrcuIt Board .±.
r(
46
If during troubleshoot±ng your test
gear tells you a PCB is bad, hoLD up
beFOre you replace it. Chances are ²t
may stiLL be good³
CouLd be the pLug-²n contacts are
d±rty, tA±she´ or corroded³ IF so, you
can take out the PCB, clean the coNµ
tacts and g²ve ²t a second chance³
¶Lways use a card extractor t· re¸
move a PC¹ ºom eLectroN²c equ²p¸
ment³ Th²s w²ll save the PCB »om
your damaging touch¼body chem±µ
cals aNd stat²c electr²c²ty½that is³
¶nd when it's out, take care not to
touch aNy oF the circuitry on the board³
HoLd ²t along the edge w²th your ¾Ngers³
To clean the contacts, use a peNc²l
eraser, a poL²sh±ng cLoth, ¿S¿
7920-
00-985-±8²9,
or a buR²sher tool, ¿S¿
5120³00´2²7µ172±.
When the contacts are clean, use a
cotton swab w²th rUbÀ²Ng alcohol or
cLeaN±Ng compound, ¿S¿
±850¶00-
105µ308²,
to brighten them³ IF you use
either oF these FOr cLeaning, keep them
oÁ other parts oF the PCB which may
have a sens²tive coat±ng³
TheN, pLug ²n the PCB and re-test ²t
to FÂnd out ²F tÃe PCB st²ll Ãas l±Ä leFt
²n it³
IF the PCB Fa±ls the second test and
has to be Åed ²n, put ²t ²n protect±ve
packag±ng³ Th²s makes Ær Mn±mum
repaÂr when the PCB gets back to sup¸
poÇt³ InÆ on packag±ng ²s on Pages
²±·²7
oF PS
²25¸
SEP ¹¹
CAble
CoNNEctors
²³.
ÈoÉc²Ng a conNector by jamʲËg or
jerK²Ng ²t shortens its L²Fe³
¶ LoÌ oF coNNectors are be²Íg Îruµ
taL²zed by some heavyÏhaNÐed type
wÃo screw 'em up ²nsÌeaD of onÑ
IF you try to FOrce a conNector, you'
ºº
Damage ²t every t²Êe³ Òse Ónesse, Not
sÔeNgth³
Eye Ìhe coNnector Ær p²n damage
ÎeÆre you coNNect ²t to tÃe rad²Õ sÖt×Ø
ÉeceÙÌacLe³ BrokeN or ÎeNt p²Ns cause
arc²Ëg wh²ch w²LL Damage your rad²o³
IF aÚL's
OK»
ÚÛËe uÙ tÜe keys w²th
Ìhe receptacLe keyways³
TÃeN tuÝ tÜe coNnecÌor sL²ghtly
clockw²se uNt²L you ÞeL the keys sL²p
²nÌo tÃe Keyways³
ßusà aNd keep ŲNg tÃe connector
uNt²L ²t's sNug oN the receÙtacLe³
¶ New coNNector may Need a l²ÌtLe
ÃeLÙ to sL²p ²N ÙLace³ ¶dd a daÎ oF
s²L²coNe grease, ¿S¿
±850-00µ880µ
7±¼±,
to the 0àrÂËg ²Ns²Ðe³
¿ever tug oN the cabLe when you're
conNect²ng or d²sáoNNect²Ng the coNâ
nector³ You'LL tw²st w²res Loose³
WÜeN you'Ée tak²Ng the connector
SEP ¹¹
Look
for
D´m´gµD
p¶·S
oÁ the receptacle, Ùusã the connector
²n³ Then, tuR ²t counterclockw±se³
4½
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