QT-80W
– 9 –
MECHANISM SECTION
1 Head Playback test tape Connect VTVM and oscilloscope to Head fixing screw Adjust to get MAX.
adjustment MTT-113 6.3 kHz speaker output (see Fig 9-3.) audio output
2 Bias Frequency Record position Connect frequency counter to TP5 and Adjust T201 80 kHz ± 1 kHz
adjustment ground (Bias Oscillation)
3 Beat cancel Record position Same as step 3 S201 from playback 75 kHz ± 0.5 kHz
to record
Step
Item
Condition
Connection Adjust
Output
TAPE Section
Figure 9-1 ADJUSTMENT POINTS
Figure 9-3
Erase Head
Head fixing
screw
Record/
Playback
Head
Tape Mechanism
TP2
FM BAND
COVERAGE
FM
DETECTION
BIAS
OSCILLATION
FM
TRACKING
fL
fH
MW BAND
COVERAGE fH
MW
TRACKING fH
T105
T104
T103
CT101
CT102
T106
VR102
IC102
T102
CT104
T107
T101
CT103
T108
TUNER P.V.C.
L103
IC101
1
9
L102
T201
IC201
MAIN PWB
L109
MW BAR ANTENNA
TC1
TC2
TC3
TC4
MW BAND
COVERAGE fL
SW1 BAND
COVERAGE
fH
fL
SW1
TRACKING
fL
fH
SW2
TRACKING
fL
fH
SW2 BAND
COVERAGE
fL
fH
MW IF
FM IF
fL
fH
S201
RECORD/PLAYBACK
MW
TRACKING fL
VCO
1
13
12
24
21
ROD
ANTENNA
C216
TP5
TP1
TP3
TP4
17
18
8
Figure 9-2 ADJUSTMENT POINTS
BIAS
OSCILLATION
T201
IC201
MAIN PWB
S201
RECORD/PLAYBACK
C216
TP5
1
2
3
4
REC
PLAY
BACK
ERASE HEAD
RECORD/
PLAYBACK HEAD
TAPE
CN504
M601
TAPE
MOTOR
SW601
TAPE MAIN
CN201
1
2
3
4
CON201
1
2
3
4
4
3
2
1
CON504
