Pll Section Alignment Chart - Realistic trc-448 Service Manual

PLL SECTION ALIGNMENT CHART
Step Control Setting Test Equipment
Test Point or
Connection
Adjust
1
MODE — RX
CH-19
CLARIFIER — Center
DC VTVM
Both ends of
VR-304
CLARIFIER
Control
VR -2 for 4V DC
2
MODE — RX
CH-19
Freq. Counter with
with level meter
See NOTE 1 below
TP-8
TC-6 for 10.24 MHz
+10Hz
3 MODE — RX (AM)
Freq. Counter with
level meter
TP-5
TC-4 for 33.485 MHz
T7, 8 for max. output
4 MODE — RX (LSB or USB)
Freq. Counter with
level meter
TP-5
TC-5 for 33.4875 MHz
5
MODE — RX (LSB)
Freq. Counter with
level metre
TP-1
Check the frequency :
7.8025 MHz
6 MODE — RX (LSB)
Freq. Counter with
level meter TP-2
TC-1 for 7.8025 MHz
+10 Hz
T1, T2 for max. output
7
MODE — RX (USB)
CH-1
DC VTVM
See NOTE 2 below
TP-7
TC-3 for 2.5 V DC
±0.1 V
8
MODE — RX (LSB)
CH-19
Freq. Counter with
Level Meter
TP-3
T3, T4 34.9875 MHz for
max. output
9
MODE — RX (LSB)
CH-1
DC VTVM
See NOTE 2 below
TP-7 TC-2 for 2.5 V DC
10
MODE — RX (AM)
CH-19
Freq. Counter with
level meter
TP-4
T6 for max. output
at 34.985 MHz
11
MODE — RX (LSB)
CH-19
Freq. Counter with
level meter
TP-4
T5 for max. output
at 19.3825 MHz
12 MODE — TX (AM or USB) Freq. Counter TP-5
VR-1 for 33.4875 MHz
NOTE 1 :
Steps 2 through 12, connect Frequency Counter through a 10 pF Capacitor to the test point noted.
I 1
10pF
TEST POINT
UNIT UNDER TEST
FREQUENCY COUNTER
NOTE 2 :
Steps 7 and 9, DC output should change from 2.5 ± 0.1 volts on CH-1 to approx. 3.5 volts on CH-40.
NOTE 3 :
You can check the input frequency to IC-2 at TP-6, use TP-7 for ground.
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