user manual

r
nected with reversed polarity. Use fabricated tool
(Fig.
28) to
push LED into holder. LED "clicks" into place.
Any tool
without
a
shoulder usually
pushes LED out of the holder.
7. Form snipped leadwires
as shown
in
Fig. 31 and connect
new LED pigtails
to them. Solder quickly to prevent over-
heating LED.
8. Reconnect black,
white and yellow leads from PC
board
to complete installation.
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TO PC BOARD
BLK . WHT
Figure
32. Power-On Indicator
Wiring
CLOCK FREQUENCY
ADJUSTMENT
PROCEDURE
Incorrect clock frequency
adjustment causes pattern
weave
on
screen. This results
from a
beat note between the vertical
sync rate of Studio II
and the hum frequency
in the TV re-
ceiver. If
the beat note is
more than 0.5 Hz,
the weave becomes
noticeable
to the critical user. Clock
frequency is a
slug
adjusts
ment on the PC
board.
1
.
Connect
scope probe to the junction of
two resistors
as
shown in Fig.
34. Connect scope ground
to
RF
shield, cartridge
post or
to other suitable
board ground.
2. Adjust
scope
time
base for
a
total
sweep
length of
20
milliseconds
or
more
(sync on "Line")
and
vertical
input
sensitivity
for about
250 mV/cm
(0.625
V/in).
3.
Push
"Clear"
button on console and
adjust
slug
slowly
for zero
waveform drift.
See
Fig.
33.
Guard against
overadjust-
ment.
L,
W
f
V1WWVWWWWL
(VERTICAL
SYNC
INTERVAL)
'
Figure
33.
Waveform Used to
Adjust
Clock Frequency.
Scope
Time-Base Locked to
60Hz
Power Line
r
r
Figure
34.
Scope
Connections
for Adjusting
Clock
Frequency
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13