Sharp QT-80W Service Manual page 9

L109
MW BAR ANTENNA
MW
TRACKING fL
VR102
FM
DETECTION
T103
MW BAND
COVERAGE fL
CT102
T104
T105
CT101
ROD
ANTENNA
MECHANISM SECTION
Step Item
1 Head
adjustment
2 Bias Frequency
adjustment
3 Beat cancel
T201
BIAS
OSCILLATION
TP5
C216
REC
MAIN PWB
Figure 9-2 ADJUSTMENT POINTS
VCO
TP3
T106
13 12
17
18
MW IF
21
24
1
TP4
T107
fH
SW1 BAND
COVERAGE
fL
TP1
CT104
fH
SW1
TRACKING fL
fL
SW2 BAND
fH COVERAGE
T102
Figure 9-1 ADJUSTMENT POINTS
Condition
Playback test tape Connect VTVM and oscilloscope to
MTT-113 6.3 kHz speaker output
Record position Connect frequency counter to TP5 and
ground
Record position Same as step 3
SW601
TAPE MAIN
4
1
3
2
2
3
1
4
CON504 CN504
M601
TAPE
MOTOR
CON201
CN201
1
1
2
2
3
3
4
4
RECORD/
PLAY
PLAYBACK HEAD
BACK
ERASE HEAD
MAIN PWB
TP2
FM IF
IC101
9
8
T108
L103
T101
TC1
CT103
TC3
fH
SW2
TRACKING
fL
TUNER P.V.C.
MW
TRACKING fH
TAPE Section
Connection
TAPE
Erase Head
– 9 –
T201
BIAS
OSCILLATION
TP5
C216
fL
FM BAND
COVERAGE
fH
1
L102
fL
FM
TC2
TRACKING
fH
TC4
MW BAND
COVERAGE fH
Adjust
Head fixing screw Adjust to get MAX.
(see Fig 9-3.) audio output
80 kHz ± 1 kHz
Adjust T201
(Bias Oscillation)
75 kHz ± 0.5 kHz
S201 from playback
to record
Record/
Head fixing
Playback
screw
Head
Figure 9-3
QT-80W
Output
Tape Mechanism