Read Sharp QT-CD250 (serv.man6) Service Manual online
QT-CD250H/W
– 10 –
MECHANISM SECTION
• Driving Force Check
PLAY: TW-2412
Over 120 g
Torque Meter
Specified Value
• Torque Check
Torque Meter
Specified Value
Play: TW-2111
25 to 65 g.cm
Fast Forward: TW-2231
60 to 130 g.cm
Rewind: TW-2231
60 to 130 g.cm
• Tape Speed
MTT-111 Variable
3,000
±
90 Hz
Output: Speaker
resistor in
Teaminal
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
X-BASS
On
• 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
Figure 10 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
82 kHz
±
6 kHz
Pin 2 of CNP201
- 6 kHz
•
AM IF/RF (For QT-CD250H)
Signal generator: 400 Hz, 30%, AM modulated
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
fH: High-range frequency
AM IF
450 kHz
1,620 kHz
T3
*1
AM Band
—
522 kHz
(fL): L4
*3
Coverage
1.0
±
0.05V
AM Tracking 600 kHz
603 kHz
(fL): L3
*2
1,400 kHz
1,404 kHz
(fH): TC1
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
*1. Input: Antenna, Output: TP1
*2. Input: Antenna, Output: Speaker terminal
*2. Input: Antenna, Output: Speaker terminal
•
FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
FM Band
—
87.5 MHz
(fL): L2
*1
Coverage
1.7 V
±
0.05V
FM RF
98.0 MHz
98.0 MHz
L1
*2
(10-30 dB)
Test Stage
Instrument
Connection
Frequency Frequency
Display
Serring/
Adjusting
Point
*1. Input: Antenna, Output: Pin 16 of IC1
*2. Input: Antenna, Output: Speaker Terminal
*3. Input: Input is not connected, Output: TP1
*2. Input: Antenna, Output: Speaker Terminal
*3. Input: Input is not connected, Output: TP1
•
AM IF/RF (For QT-CD250W)
Signal generator: 400 Hz, 30%, AM modulated
AM IF
450 kHz
1,602 kHz
T3
*1
(9kHz span)
1,620 kHz
(10kHz span)
1,620 kHz
(10kHz span)
AM Band
—
531 kHz
(fL): L4
*3
Coverage
(9kHz span)
1.0
±
0.05V
AM Band
—
530 kHz
(fL): L4
*3
Coverage
(10kHz span)
1.0
±
0.05V
AM Tracking 603 kHz
603 kHz
(fL): L3
*2
(9kHz span) 1,404 kHz
1,404 kHz
(fH): TC1
AM Tracking 600 kHz
600 kHz
(fL): L3
*2
(10kHz span) 1,400 kHz
1,400 kHz
(fH): TC1
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
SW102
CNP101
L301
CNP602
R7
L1
L2
IC1
T3
TC1
HPJ201
HEADPHONES
HEADPHONES
L4
IC101
1
12
11
2
CNP201
1
2
3
1
2
3
FM RF
AM BAND
COVERAGE fL
COVERAGE fL
TP1
L3
AM BAR
ANTENNA
AM BAR
ANTENNA
AM
TRACKING fL
TRACKING fL
AM
TRACKING fH
TRACKING fH
AM IF
1
13
16
12
24
FM BAND
COVERAGE fL
COVERAGE fL
BIAS OSC.
1
2
3
4
MAIN PWB
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