Filter
Top Products
r
nectedwith reversed polarity. Usefabricated tool
(Fig.
28)to
push LED intoholder. LED"clicks" into place.
Anytool
without
a
shoulder usually
pushes LEDoutofthe holder.
7. Formsnipped leadwires
asshown
in
Fig. 31andconnect
new LED pigtails
tothem. Solderquickly topreventover-
heating LED.
8. Reconnect black,
whiteand yellowleadsfrom PC
board
tocomplete installation.
r
TOPC BOARD
BLK. WHT
Figure
32. Power-On Indicator
Wiring
CLOCK FREQUENCY
ADJUSTMENT
PROCEDURE
Incorrectclockfrequency
adjustmentcauses pattern
weave
on
screen. Thisresults
froma
beatnote between thevertical
syncrate ofStudio II
andthe humfrequency
in the TVre-
ceiver. If
the beatnoteis
morethan 0.5Hz,
theweave becomes
noticeable
tothecritical user. Clock
frequency is a
slug
adjusts
mentonthe PC
board.
1
.
Connect
scope probetothe junction of
two resistors
as
shown in Fig.
34. Connect scopeground
to
RF
shield, cartridge
postor
toothersuitable
boardground.
2. Adjust
scope
time
basefor
a
total
sweep
length of
20
milliseconds
or
more
(syncon "Line")
and
vertical
input
sensitivity
forabout
250mV/cm
(0.625
V/in).
3.
Push
"Clear"
buttonon consoleand
adjust
slug
slowly
for zero
waveformdrift.
See
Fig.
33.
Guard against
overadjust-
ment.
L,
W
f
V1WWVWWWWL
(VERTICAL
SYNC
INTERVAL)
'
Figure
33.
Waveform Usedto
Adjust
Clock Frequency.
Scope
Time-Base Lockedto
60Hz
Power Line
r
r
Figure
34.
Scope
Connections
forAdjusting
Clock
Frequency
r
13