Sharp QT-90W Service Manual page 7

Step Alignment
Test Equipment
Frequency
1 MW IF: 455 kHz (1) AM IF sweep
generator with
loop antenna
(2) Alignment
oscilloscope
(3) Power supply
2 MW (1) MW sweep
TRACKING fH: generator with
1,650 kHz antenna
(2) Alignment
oscilloscope
(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 Test Equipment
Frequency
1 SW1 BAND (1) SW1 sweep
COVERAGE fH: generator with
7.4 MHz antenna
(2) Alignment
oscilloscope
(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
Test Equipment
Frequency
1 SW2 BAND (1) SW2 sweep
COVERAGE fH: generator
22.5 MHz (2) Alignment
oscilloscope
(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.
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MW Section
Signal-in
Let the MW ANT
coil close to the
generator ANT.
Same as step 1
Same as step 1
Same as step 1
Same as step 1
SW1 Section
Signal-in
Let the MW ANT
coil close to the
generator ANT.
point TP1
Same as step 1
Same as step 1
Same as step 1
SW2 Section
Signal-in
Inject the RF
signal directly to
point TP1
Same as step 1
Same as step 1
Same as step 1
– 7 –
Signal-out Adjust
Take out the signal Adjust T107 get MAX.
from point TP4 output at 455 kHz
Same as step 1 Adjust P.V.C. (TC3)
get MAX. output at
1,650 kHz
Same as step 1 Adjust T103 to get
MAX. output at 515 kHz end
Same as step 1 Adjust P.V.C. (TC4)
get MAX. output at
1,400 kHz
Same as step 1 Adjust L109 get MAX.
output at 600 kHz
Signal-out Adjust
Take out the signal Adjust CT102 get MAX. (1) Band SW in SW1
from point TP4 output at 7.4 MHz
Same as step 1 Adjust T104 get MAX.
output at 2.25 MHz
Same as step 1 Adjust CT104 get MAX.
output at 6 MHz
Same as step 1 Adjust T101 get MAX.
output at 2.6 MHz
Adjust
Signal-out
Take out the signal Adjust CT101 get MAX. (1) Band SW in SW2
from point TP4 output at 22.5 MHz
Same as step 1 Adjust T105 get MAX.
output at 7.2 MHz
Same as step 1 Adjust CT103 get MAX.
output at 19 MHz
Same as step 1 Adjust T102 get MAX.
output at 8.5 MHz
QT-90W
Remark
(1) Band SW in MW
position
(2) VOL. control in MIN.
position
(3) Tune P.V.C. to
high end
Same as step 1
Tune P.V.C. to low
Tune P.V.C. to
1.400 kHz
Tune P.V.C. to
600 kHz
Remark
position
(2) VOL. control in MIN.
position
(3) Tune P.V.C. to
high end
Tune P.V.C. to low
end
Tune P.V.C. to 6 MHz
Tune P.V.C. to
2.6 MHz
Remark
position
(2) VOL. control in MIN.
position
(3) Tune P.V.C. to
high end
Tune P.V.C. to low
end
Tune P.V.C. to
19 MHz
Tune P.V.C. to
8.5 MHz