Sharp QT-90W Service Manual page 7

Step
Alignment
Frequency
1 MW IF: 455 kHz (1) AM IF sweep
(2) Alignment
(3) Power supply
2 MW (1) MW sweep
TRACKING fH:
1,650 kHz
(2) Alignment
(3) Power supply
3 MW BAND Same as step 2
COVERAGE fL:
515 kHz
4 Repeat step 2, 3 until no further improvement can be made.
5 MW BAND Same as step 2
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 (1) SW1 sweep
COVERAGE fH:
7.4 MHz
(2) Alignment
(3) Power supply
2 SW1 BAND Same as step 1
COVERAGE fL:
2.25 MHz
3 Repeat step 1, 2 until no further improvement can be made.
4 SW1 Same as step 1
TRACKING fH:
6 MHz
5 SW1 Same as step 1
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 (1) SW2 sweep
COVERAGE fH:
(2) Alignment
22.5 MHz
(3) Power supply
2 SW2 BAND Same as step 1
COVERAGE fL:
7.2 MHz
3 Repeat step 1, 2 until no further improvement can be made.
4 SW2 Same as step 1
TRACKING fH:
19 MHz
5 SW2 Same as step 1
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.
oscilloscope
Same as step 1
generator with
antenna
oscilloscope
Same as step 1
Same as step 1
Same as step 1
Test Equipment Signal-in
Let the MW ANT
generator with coil close to the
antenna
generator ANT.
point TP1
oscilloscope
Same as step 1
Same as step 1
Same as step 1
Test Equipment Signal-in
Inject the RF
generator signal directly to
point TP1
oscilloscope
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. (1) Band SW in SW1
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
– 7 –
Adjust
(1) Band SW in MW
output at 455 kHz
(2) VOL. control in MIN.
(3) Tune P.V.C. to
Adjust P.V.C. (TC3) Same as step 1
get MAX. output at
1,650 kHz
Adjust T103 to get Tune P.V.C. to low
MAX. output at 515 kHz end
Adjust P.V.C. (TC4) Tune P.V.C. to
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
output at 7.4 MHz position
(2) VOL. control in MIN.
(3) Tune P.V.C. to
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
(2) VOL. control in MIN.
(3) Tune P.V.C. to
Tune P.V.C. to low
Adjust T105 get MAX.
output at 7.2 MHz end
Tune P.V.C. to
Adjust CT103 get MAX.
output at 19 MHz 19 MHz
Tune P.V.C. to
Adjust T102 get MAX.
output at 8.5 MHz 8.5 MHz
QT-90W
Remark
position
position
high end
Remark
position
high end
Remark
position
position
high end