SERVICE ADJUSTMENT
ADJUSTMENT
TUNER
COILS
The tuner has been factory preset (no
adjustment is needed).
Set voltage at in band.
Connect sweep generator’s output to the test
point of tuner, by using a
DC cut probe.
I
Connection Diagram of
DC Cut
* NOTE:
The sweep generator’s probe should
be
grounded closely to the tuner test point.
Output level of sweep generator:
Connect response lead (low impedance probe
with detector)
to the collector of
(in IF
unit).
To
To
1
t e s t
A
A A
Connection Diagram of Low Impedance Probe
(with Detector).
Apply DC
to pin of
(in IF unit).
RF
Apply DC
(about,
to the tuner
terminal.
Connect
ohm resistor between base of
and
line.
Adjust the tuner IF coils to obtain the
waveform as shown figure below.
NOTE:
For the adjustment, keep the tuner covered
with its lid.
P =
MHz
Adjust so that
are at the same /eve/.
P-DETECTOR COIL:
This coil (in IF unit) has been factory
Adjust
so that
MHz signal is at
preset (no adjustment is needed).
maximum
Connect sweep generator’s output to pin
of
l
Probe in use:
DC cut probe
l
Sweep output level:
PI F
Apply
DC to pin of
Have AFT muted.
AFT is muted if pin of IF unit is grounded.
Connect response lead to
The response lead in use should be a direct
probe with a resistor of
ohms included.
P
MHz)
1
To
test point
* Adjust
voltage so that the output
waveform is of
1
Direct Probe.
3
Summary of Contents for 21N52-E1
Page 21: ...PRINTED WIRING BOARD ASSEMBLIES PWM A Wiring Side PWM B Wiring Side 1 I 2 I 3 I 4 I 5 I 6 21 ...
Page 22: ...PWB A Wiring Side I 7 I 8 9 I 10 11 12 22 ...
Page 25: ...PRINTED WIRING BOARD ASSEMBLIES Continued IJ PWB D Wiring Side 1 I 2 I 3 I 4 I 5 I 6 1 25 ...
Page 29: ...SCHEMATIC DIAGRAM SUB CIRCUIT 29 ...
Page 31: ...SCHEMATIC DIAGRAM MAIN CIRCUIT ...
Page 33: ...BLOCK DIAGRAM MAIN CIRCUIT 1 1 2 I 3 4 I 5 I 6 3 3 ...
Page 34: ...1 7 8 9 I 10 11 I 12 I 34 ...
Page 35: ...BLOCK DIAGRAM SUB CIRCUIT ADG COIL 7 1 2 1 3 4 I 5 I 6 I 35 ...
Page 36: ...7 I 8 9 10 11 12 36 ...
