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T.TEIUG(N) 1/1
2-4. TUNER AND IF CIRCUITS ADJUSTMENT
.
When any malfunction
occurs in the TUNER circuit the
NOTE:
whole unit must be replaced.
An adjustment of the IF circuit is shown as follows.
2-4-1. TEST EQUIPMENT
AND STANDARD
REQUIRED
The TUNER unit does not need any adjustments,
because precise adjustments have been performed
before shipment.
I
Monitor TV
2-4-2.
LOCATION OF ADJUSTMENT
POINT
PPFUSOO1O-R1
VR (RF AGC)—
Tuner/l F/RF~
Conv. Unit
r
o
Rear Panel
o
~
CP-I PWB
(PARTS SIDE)
f
IF
UNIT
Fig.
2.4.1
2-4-3.
RF AGC ADJ.
Measuring Point Measuring Equipment AIM. Condition
Picture of
Monitor TV
E-E mode
monitor TV
ADJ. Location
ADJ. Value
VR (RF AGC)
SIN is best point
(on the IF circuit)
1.
2.
3.
4.
Connect the monitorlV
to VHF/UHF ANTENNA OUTPUT
–
terminal.
Connect the VHF antenna to VHF/UHF ANTENNA INPUT
terminal.
Receive the middle electrical field(70
dB~ -90 dB@ of the
VHF high channel, and slowly turn 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 TVthatthere
is no beat and saturation
(S/N is best point) when receiving any TV channel.
3.
TEST POINT FOR TAPE PATHADJUSTMENT
Test
point TP182 (ENV) and TP183 (SW-P)
for tape path adjustment
isshown
in Figure below.
For adjustment, refer to the Mechanism
Service Technical lnformation(WM-530599
and MS531206).
P1B08800C-T3
Shield case
o
Y\]
"
@l
.-
0
———
TP181
REC Current
TP1S3
SW-P
~
/
TP182 ENV ~
\
VR182 REC-YJC
VP- I PVVB ASS'Y
Fig.
3.1
–14–
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