JVC PC-V55 B - Page 9

2. FM IF ALIGNMENT
PC-V55 B/E/G
Description
RADIO
AM
Minimum gain position
Center position
Near the minimum capacity position where no signal come in.
Function switch position:
Band select switch:
Volume control:
SEA control:
Variable capacitor:
Connection of Sweeper and the receiver
Tuner input:
Tuner output:
Positive side to TC3 positive side
Positive side to TP6
Negative side to TP7 ]
CFT
Adjust AM I.F.T. (above mentioned aligning position) so that
maximum and symmetrical wave form can be obtained.
In this case, the wavehead should be appeared at the center
marker (450 kHz) on the scope of Sweeper.
Aligning position:
Alignment (Waveform):
2-1 Conditions of the receiver
(1)
Power
source:
Same
as
mentioned
in
item
1-1
(2) Function switch position: RADIO
(3) Band select switch: FM
(4) Volume control: Minimum gain position
(5) SEA control: Center position
(6)
Variable
capacitor:
Near
the
minimum
capacity
position
where
no
signal
come
in.
2-2 Connection of Sweeper and the receiver
(1) Tuner input: Positive side to TP5
(2)
Tuner
output:
Positive
side
to
TP6
Negative side to TP7
NOTE
a)
Attach
a
capacitor
(30
pF)
and
resistor
(30
kQ)
to
the
positive
side
cable
which
shall
be
led
from
Sweeper input.
b) Attach a resistor (100 k®) in series to the positive side cable which shall be led from Sweeper output.
2-3. Checking FM IF waveforms
The waveform should be symmetrical. Depending on the C. Filter used, the intermediate frequencies are as shown
in the table below.
C.
Filter
color
marking
Frequency
(MHz)
C.
Filter
color
marking
Frequency
(MHz)
Black
10.64
+
0.03
Orange
10.73
+
0.03
Blue
10.67
+
0.03
White
10.76
+
0.03
Red 10.70 + 0.03
3. AM RF ALIGNMENT
3-1
(1)
(2)
(3)
(4)
(5)
3-2
(1)
(2)
(3)
3-3
3-4
Conditions of the receiver.
Power source: Same as mentioned in item 1-1.
Function switch position: RADIO
Volume control: 50 mW
SEA control: Center position
Variable capacitor: Refer the following list shown in item 3-4.
Conditions of SSG.
Modulation: Refer the basic condition
Frequency: Refer the following list shown in item 3-4.
Output level of the attenuator in SSG: Approx. 50 mW
Power output measuring position: Speaker terminals
Alignment:
(No. 1741) 9