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T-TLl/A2(N)
W
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.
,"
e - --
I Monitor
TV
I
I
2-4-2.
LOCATiON OF ADJUSTMENT
POINT
PPFUSO030-R1
(_
o
Tuner/lF/RF
~
(
Conv. Unit
~
t
J
VR
(RF AGC)
IF
UNIT(PARTS
SIDE)
Rear Panel
CP-I PWB
Fig. 2.4.1
2-4-3.
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 IF circuit)
1.
2.
3.
4.
Connect the monitor
TV to VHF/UHF ANTENNA
OUTPUT
terminal.
Connect the VHF antenna to VHFLJHF ANTENNA
INPUT
terminal.
Receive the middle electrical field (70 dB# -90 dBp) 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 bymonitor
TVthatthere
isnobeatandsatu
ration
3.
TE~
POINT FOR TAPE PATH ADJUSTMENT
(S/N is bestpoint) when receiving
any TV channel.
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
lnformation(WM-530599
and MS531346).
)—Shield
Case
t
( ~
0
/7'("
U@)
.-
0
———
TP181 REC Current
P1B08800C-T3
VP-1 PWB Assembly
Fig.3.1
I
I
–13–
.
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