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.
The adjustments for the IF (RF AGC) circuit of the 3 in 1
tuner are described below.
15502 {N) T1
2-4. IFCIRCUITADJUSTMENT
.
k7thk
model, the circuits of the TUNER,
IF, and RF
converter have been made into one. Therefore, should
one circuit malfunction, the whole unit must be replaced.
Note
The 3 in 1 tuner dose not need any adjustments,
because
precise
adjustments
were
down
befor
shipment.
2-4-1. TEST EQUIPMENT
AND STANDARD
REQUIRED
Monitor lV
2-4-2. LOCATION
OF ADJUSTMENT
POINT
2-4-3. RF AGC ADJ.
P36200B1T5
*
Rear
Panel
_
o
3 in 1 Tuner
10
1°[
VR r-l
+1
X These VRS are
I
positioned with
the models.
lr
3
in 1 Tuner
Fig.
2-4-1
Measuring
Point
I Measuring
Equipment
I
Adj. Condition I
Picture of
Monitor TV
E-E mode
monitor TV
Adj. Location
Adj. Value
VR (RF AGC)
S/N is best point
(on the 3 in 1 tuner)
1.
2.
3.
4.
Connect the monitor TV to the VHF/UHF antenna output
terminal.
Connect the VHF or UHF antenna to the VHF/UHF an-
tenna input terminal.
Receive the middle electrical field (70 dBL -90
dB9) 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 satura-
tion (S/N is best point) when receiving any TV channel.
3. TEST POINTS FOR TAPE PATH ADJUSTMENT
Test points TP182 (E NV) and TP183 (SW-P) for tape path adjustment are shown in figure below.
For adjustment, refer to the separate volume "Mechanism
Manual (MM531433).
"
P37400B1T5
TP181 p~
Shield case m=
1
I
rTp'82m
la
VP-1 PWB Assembly
Fig. 3-1
—
–14–
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