Sony APR-5001 Series Operation And Maintenance Manual page 179

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Figure 6 - 15 . TIB PC Board
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STEP 5 If the
duty cycle is
not 50 %
,
it will be
necessary to adjust RV1 on the TTS board
.
( See Figure 6 - 16
.
) Tb access
the
TTS , it
is
necessary to remove the top front cosmetic
cover ( see Section 6.4 . 2 ) .
calibrated sweep so that one cycle of the
waveform fills the entire
screen .
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If the duty cycle is
not 50 %
,
it will be
necessary to adjust
RV2 on the TTS board .
To access the TTS , it is necessary to remove
the top front cosmetic cover if it is not
already removed
.
( See Section 6.4
.
2
.
)
Probe
IC 13
pin
2 with the positive lead of
the oscilloscope
. This is the supply motor
tachometer RTSA signal
.
Set the oscillo
-
scope uncalibrated sweep so that one cy -
cle of the waveform fills the entire
screen
.
STEP 7
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.
STEP 8
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RV 1
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If the duty cycle is
not 50 %
,
it will be
necessary to adjust RV 1 on the supply RTS
board
.
( See Figure 6 - 17
.
)
STEP 9
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RV 2
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Figure 6
-
16
.
TTS PC Board
STEP 6 Probe IC 13
pin
10
with the positive lead of
the oscilloscope
.
( See Figure 6 - 15
.
) This is
the TTSB signal
. Set
the oscilloscope un -
<
_
>
RV 2 ( RTSB
)
' 1 (
RTSA
)
Figure 6
-
17
.
RTS PC Board
6
-
15