Sharp QT-80W Service Manual page 8

QT-80W
Step
Alignment
Frequency
1 MW IF: 455 kHz (1) AM IF sweep
2 MW
TRACKING fH:
1,650 kHz
3 MW BAND
COVERAGE fL:
515 kHz
4 Repeat step 2, 3 until no further improvement can be made.
5 MW BAND
COVERAGE fH:
1,400 kHz
6 MW TRACKING Same as step 2
fL: 600 kHz
7 Repeat step 5, 6 and then step 2, 3, 5,6 until no further improvement can be made.
Step
Alignment
Frequency
1 SW1 BAND
COVERAGE fH:
7.4 MHz
2 SW1 BAND
COVERAGE fL:
2.25MHz
3 Repeat step 1, 2 until no further improvement can be made.
4 SW1
TRACKING fH:
6 MHz
5 SW1
TRACKING fL:
2.6 MHz
6 Repeat step 4, 5 and then step 1, 2, 4, 5 until no further improvement can be made.
Step
Alignment
Frequency
1 SW2 BAND
COVERAGE fH:
22.5 MHz
2 SW2 BAND
COVERAGE fL:
7.2 MHz
3 Repeat step 1, 2 until no further improvement can be made.
4 SW2
TRACKING fH:
19 MHz
5 SW2
TRACKING fL:
8.5 MHz
6 Repeat step 4, 5 and then step 1, 2, 4, 5 until no further improvement can be made.
Test Equipment
Signal-in
Let the MW ANT
generator with coil close to the
loop antenna
generator ANT.
(2) Alignment
oscilloscope
(3) Power supply
(1) MW sweep Same as step 1
generator with
antenna
(2) Alignment
oscilloscope
(3) Power supply
Same as step 2 Same as step 1
Same as step 2 Same as step 1
Same as step 1
Test Equipment
Signal-in
(1) SW1 sweep Let the MW ANT
generator with coil close to the
antenna
generator ANT.
(2) Alignment point TP1
oscilloscope
(3) Power supply
Same as step 1 Same as step 1
Same as step 1 Same as step 1
Same as step 1 Same as step 1
Test Equipment Signal-in
(1) SW2 sweep Inject the RF
generator signal directly to
(2) Alignment
point TP1
oscilloscope
(3) Power supply
Same as step 1 Same as step 1
Same as step 1 Same as step 1
Same as step 1 Same as step 1
MW Section
Signal-out
Take out the signal Adjust T107 get MAX.
from point TP4
Same as step 1
Same as step 1
Same as step 1
Same as step 1
SW1 Section
Signal-out
Take out the signal Adjust CT102 get MAX.
from point TP4
Same as step 1
Same as step 1
Same as step 1
SW2 Section
Signal-out
Take out the signal Adjust CT101 get MAX. (1) Band SW in SW2
from point TP4
Same as step 1
Same as step 1
Same as step 1
– 8 –
Adjust
(1) Band SW in MW
output at 455 kHz position
(2) VOL. control in MIN.
position
(3) Tune P.V.C. to
high end
Adjust P.V.C. (TC3) Same as step 1
get MAX. output at
1,650 kHz
Tune P.V.C. to low
Adjust T103 to get
MAX. output at 515 kHz end
Tune P.V.C. to
Adjust P.V.C. (TC4)
get MAX. output at 1.400 kHz
1,400 kHz
Tune P.V.C. to
Adjust L109 get MAX.
output at 600 kHz 600 kHz
Adjust
(1) Band SW in SW1
output at 7.4 MHz position
(2) VOL. control in MIN.
position
(3) Tune P.V.C. to
high end
Tune P.V.C. to low
Adjust T104 get MAX.
output at 2.25 MHz end
Adjust CT104 get MAX. Tune P.V.C. to 6 MHz
output at 6 MHz
Tune P.V.C. to
Adjust T101 get MAX.
output at 2.6 MHz 2.6 MHz
Adjust
output at 22.5 MHz position
(2) VOL. control in MIN.
position
(3) Tune P.V.C. to
high end
Adjust T105 get MAX. Tune P.V.C. to low
output at 7.2 MHz end
Tune P.V.C. to
Adjust CT103 get MAX.
output at 19 MHz 19 MHz
Adjust T102 get MAX. Tune P.V.C. to
output at 8.5 MHz 8.5 MHz
Remark
Remark
Remark