Read Sharp QT-CD180 (serv.man3) Service Manual online
QT-CD180H/QT-CD180W
– 11 –
MECHANISM SECTION
• Driving Force Check
PLAY: TW-2412
Over 80 g
Torque Meter
Specified Value
• Torque Check
Torque Meter
Specified Value
Play: TW-2111
30 to 60 g.cm
Fast Forward: TW-2231
55 to 140 g.cm
Rewind: TW-2231
55 to 140 g.cm
• Tape Speed
MTT-111 Variable
3,000
±
90 Hz
Output: Speaker
resistor in
Terminal
motor. (M601)
(CNP201 Load
resistance: 4 ohms)
resistance: 4 ohms)
Instrument
Connection
Specified
Value
Test
Tape
TAPE SECTION
Position of each switch or control
Volume control
Max
Function switch
Tape/Power Off
• Bias Oscillation
Adjustment Point
• Playback Amplifier Sensitivity Check
Instrument Connection
Test Tape
MTT-118
1.1 V
±
3 dB
Speaker Terminal
(Load resistance: 4 ohms)
(Load resistance: 4 ohms)
Specified Value
ADJUSTMENT
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
fH: High-range frequency
• FM IF/RF
FM Detection
T2
FM
fL: L2
Band Coverage
fH: TC2
FM Tracking
fL: 88.0 MHz: L1
fH: 108.0 MHz: TC1
fH: 108.0 MHz: TC1
Test Stage
Specified
Value/Adjusting
Point
Instrument
Connection
Input: Pin 1 of IC1
Output: Pin 18 of IC1
Output: Pin 18 of IC1
Input: Antenna
Output: Speaker
Terminal (CNP201
Load resistance: 4
ohms)
Output: Speaker
Terminal (CNP201
Load resistance: 4
ohms)
• AM IF/RF
AM IF
T3
Input: Antenna
Output: Pin 18 of IC1
Output: Pin 18 of IC1
AM
fL: L4
Input: Antenna
Band Coverage
fH: TC4
Output: Speaker
AM Tracking
fL: 600 kHz: L3
Terminal (CNP201
fH: 1,400 kHz: TC3
Load resistance: 4
ohms)
ohms)
Test Stage
Specified
Value/Adjusting
Point
Instrument
Connection
Figure 11 ADJUSTMENT POINTS
• Head Azimuth
Torque Meter
Specified Value
MTT-114
Output: Speaker Terminal
(CNP201 Load resistance: 4 ohms)
(CNP201 Load resistance: 4 ohms)
Adjusting
Point
Specified Value
Instrument
Connection
L301
80 kHz
±
6 kHz
Pin 1 of CNP101
M601
TAPE MOTOR
SW601
TAPE MAIN
TAPE MAIN
TAPE MECHANISM
Variable resistor
in motor
in motor
VR201
SW201
CNP101
SW102
L1
L4
L2
IC1
T3
IC101
BI803
IC201
CNP602
BI802
BI801
L301
T2
1
1
TC4
TC2
TC1
TC3
FM ROD ANTENNA
MAIN PWB
1
13
18
AM BAND
COVERAGE
COVERAGE
fL
fH
AM IF
FM
DETECTION
DETECTION
12
24
BIAS OSC.
AM
TRACKING
TRACKING
fL
fH
L3
AM BAR
ANTENNA
1
12
11
2
2
3
4
1 2 3
2
FM BAND
COVERAGE
COVERAGE
L3
IC802
IC803
1
14
15
IC801
1
12
13
24
CNP201
28
fH
fL
FM
TRACKING
TRACKING
fH
fL
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