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tJ
PC -V77
A /B/E/G/UN
.....
Band Select
Switch Position
13
14
15
SW
16
17
(A/U
Version)
Sort of Antenna
to
be
attached
to
SSG
Dummy
Antenna
Frequency of SSG
Preset Memory No.
Aligning
Position
17.9MHz
M5
L6
Turn L6 until the voltage of TP9 becomes 4 .4±0.02 V
.
6
MHz
to be received 6
MHz
L4
17
MHz
to be received 1 7 MHz
TC -4
18
Adjust the above aligning position (L4 & TP-4) repeatedly so
that the tuner can be obtained the best sensitivity.
Item
Description
4. FM RF ALIGNMENT
4
-
1
Conditions of the receiver
.
(
1) Power
source:
Same as mentioned in item
1-
1.
(2) Function switch position:
RADIO
(3)
8and
select switch:
FM
(4) Volume control:
50 mW
(5) S EA control:
Center position
(6) Variable capacitor:
Refer the following list shown
in
item 4
-3.
4-2 Condition of FM SSG
.
(1 ) Modulation
:
Refer the basic
condition
(2) Frequency:
Refer the following list shown in
item
4 -3.
(3)
Output
level of the attenuator in FM
SSG:
The level shall be decided by the load resistance of the
receiver mentioned in the basic
conditions.
4 -3
Connection of sweeper and the receiver.
(1
)
Tuner
input
Positive side to TP 1
.
Negative side
to
TP2
.
(2) Tuner output
Positive side to
4 -4
Alignment:
Band
Select
Sort of Antenna
to
be
Frequency of SSG
Aligning
Switch Position
attached to
SSG
Preset
Memory No.
Position
1
108 MHz
M5
L1
2
FM
Dummy
Adjust L 1 until the
voltage
of TP9 becomes 4.4±0.05 V.
3
Antenna
4
88 MHz
to be received 90 MHz (M2)
L2
5
108 MHz
to be received 108 MHz (M4)
TC -2
6
Adjust the above
aligning
position
(L2
& TC
-2)
repeatedly
so
that
the tuner
can
be
obtained
the best
sensitivity.
Adjustments
after
AM oscillation
circuit replacement
Initial setting
• Set
L5 to VOM7U02-402. (Seal is 402.)
•
Position TC 5 (trimmer) in the center.
1) Do tracking adjustment of L3 and TC3.
2) Measure the maximum sensitivity for
every
100
kHz
from
600
kHz (or
603 kHz) to 1000 kHz
(or
999 kHz).
Then
do the following:
a) If better than the threshold value (52 dB/m) of
the
max-
imum sensitivity at each frequency,
it is
okay
.
b) If it becomes worse than the threshold value at around
700 kHz to 800 kHz, set TC 5 to MAX and readjust the
RF tracking.
c) If it becomes worse than the threshold value at around
900
kHz to 1000 kHz, set TC5 to MIN and readjust
the RF tracking.
10 (No. 1740)
Reference
OSC
circuit parts
06 KV 1250
C25 OFS 41HJ -391
TC5 OAT 3720-600M
L5 VOM7002 -401
IC2 LA1810
C260CT3OCH -5R6Y
03 2SC2839(E) (Except
for
C/J
version.)
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