Sharp QT-90W Service Manual page 8

QT-90W
L109
MW BAR ANTENNA
MW
TRACKING fL
VCO
VR102
T106
FM
DETECTION
T103
MW BAND
COVERAGE fL
T104
fL
SW1 BAND
COVERAGE
fH
CT102
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
TP5
REC
MAIN PWB
Figure 8-2 ADJUSTMENT POINTS
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TP3
13 12
17
18
MW IF
21
24 1
TP4
T107
T108
T101
fL
SW1
TRACKING fH
fL SW2 BAND
T102
fH COVERAGE
fH
TP6 TP1
MAIN PWB
Figure 8-1 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
CON602 CN602
M601
TAPE
MOTOR
CON201 CN201
1
1
2
2
TAPE
3
3
4
4
RECORD/
PLAY
PLAYBACK HEAD
BACK
ERASE HEAD
fL
FM BAND
TP2
COVERAGE
fH
FM IF
IC101
1
9 8
L103
CT104 TC1
TC2
TC3
CT103
TC4
SW2
TUNER P.V.C.
fL TRACKING
MW
TRACKING fH
Connection
Head fixing screw
(see Fig 8-3.)
Adjust T201
(Bias Oscillation)
S201 from playback
to record
Head fixing
screw
Erase Head
– 8 –
T201
TP5
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 8-3