Advertisement
._
L
T.TP4H/E(l) 1/1
2-4. TUNER AND IF CIRCUITS ADJUSTMENT
.
When any malfunction
occurs in the TUNER
circuit the
NOTE:
The TUNER unit does not need any adjustments,
whole unit must be replaced.
because precise adjustments have been done before
.
An adjustment of the IF circuit is shown as follows.
shipment.
2-4-1.
TEST EQUIPMENT
AND STANDARDS
REQUIRED
Monitor TV
1
2-4-2. LOCATION OF ADJUSTMENT
POINT
2-4-3. RF AGC ADJ.
PPCRO05E0 R1
,
Rear
Panel
Tuner
Uni
4[
_
CP-I
PWB
~R 611
RF
AGC—
w
(PARTS SIDE)
1 _
IF Unit
IF UNIT
Fig. 2.4.1
Measuring Point
Measuring Equipment
ADJ. Con~tion
Picture of
Monitor TV
E-E mode
monitor TV
ADJ. Location
ADJ. Value
VR611 (RF AGC)
S/N is best point
(on the IFcircuit)
1.
2.
3.
4.
Connect the monitor TVto VHF/UHF ANTENNA OUTPUT
terminal.
Connect
the antenna
to VHF/UHF
ANTENNA
INPUT
terminal.
Receive the middle electrical field (70 dBK -90 dB@ of the
VHFhigh channel, andslowlyturn
VR61 1 (RF AGC)from
the point where
snow-noise
is present to the point
where it just disappears from the monitor TV.
Confirm by monitor TVthatthere
is no beat and saturation
(S/N is best point) when receiving any TV channel.
3. TEST POINT FOR TAPE PATH ADJUSTMENT
Test point TP182 (ENV) and TP183 (SW-P) for tape path adjustment is shown in Figure below.
For adjustment, refer to the Mechanism
Service Technical Information (WM-530599
and MS531 206).
P1B102OOD-T3
TP182 -l
TP183 ~]
TP181
[REC CURRENT]
Shield case
o
L
VP-1 PWB ASS'Y
Fig. 3.1
–15–
Advertisement
