Sharp QT-80W Service Manual page 9

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