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2-3. IF CIRCUIT ADJUSTMENT
In this model,
the circuits
of the TUNER,
IF, and RF
Note:
The 3 in tuner dose not need any adjustments,
because
converter
have been made into one. Therefore,
should one
precise
adjustments
were down before shipment.
circuit malfunction,
the whole unit must be replaced.
The adjustments
for the IF (RF AGC)
circuit of the 3 in 1
tuner are described
below.
2-3-1. TEST EQUIPMENT
AND STANDARD
REQUIRED
I Monitor TV
I
I
2-3-2. LOCATION
OF ADJUSTMENT
POINT
P36200B
Rear Panel _
h\,
IL
F
c '
3 in
1
Tuner
w
3
0
3
c >
CP-I PWB
Assembly
—
c
>
c,
?
c
>
VR piniq
c
>
c
>
c e '
3
in 1 Tuner
Fig. 2-3-1
2-3-3. RF AGC ADJ.
Measuring
Point
Measuring
Equipment
Adj. Condition
Picture of
Monitor TV
E-E mode
monitor TV
Adj. Location
Adj. Value
-.\
VR (RF AGC)
SIN is best point
(on the 3 in 1 tuner)
4
1.
2.
3.
4.
Connect
the monitor TV to the VHFIUHF
antenna
output
terminal.
Connect the VHF or UHF antenna to the VHF/UHF
antenna
input terminal.
Receive
the middle electrical field (70 dB~ -90
dB~) of the
VHF or UHF channel,
and slowly turn the VR (RF AGC)
from the point where
snow-noise
is present
to the point
where
it just disappears
from the monitor TV.
Confirm by monitor TV that there is no beat and saturation
(SIN is best point) when receiving
any TV channel.
2-4. CHECKING THE RF CHANNEL
If the TV and VCR are connected
by an aerial output cable which has poor shieiding.characteristics,
turn off the RF converter
of
the VCR and use the VCR with an AV cable. To turn the RF converter-off,
input "OOi when setting the RF (when "RF" is
displayed)
during VCR pre-setting.
3. TEST POINTS FOR TAPE PATH ADJUSTMENT
Test points TP182
(ENV)
andTP183
(SW-P)
for tape path adjustment
are shown in figure below.
For adjustment,
refer to the separate
volume "V95 I Mechanism
Manual" (MM531 433) and "V95 I I Mechanism
Manual" (MS531 500).
PS6300D
TP183
TP182
(SW-P)
(ENV.)
h'
-m
e
1
—
VP-1
PWB
Assembly
Fig. 3-1
_.
"e'
-12-
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