QT-CD250
– 7 –
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)
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)
Specified Value
ADJUSTMENT
Figure 7 ADJUSTMENT POINTS
• Head Azimuth
Torque Meter
Specified Value
MTT-114 Output: Speaker Terminal
(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
Signal generator: 400 Hz, 30%, AM modulated
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
AM IF 450 kHz 1,720 kHz T3 *1
AM Band — 530 kHz (fL): L4 *3
Coverage 1.0 ±0.05V
AM Tracking 600 kHz 600 kHz (fL): L3 *2
1,400 kHz 1,400 kHz (fH): TC1
Test Stage
Frequency Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
*1. Input: Antenna, Output: TP1
*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
SW102
CNP101
L301
CNP602
R7
L1
L2
IC1
T3
TC1
HPJ201
HEADPHONE
L4
IC101
1
12
11
2
CNP201
1
2
3
1
2
3
FM IF
AM BAND
COVERAGE fL
TP1
L3
AM BAR
ANTENNA
AM
TRACKING fL
AM
TRACKING fH
AM IF
1
13
16
12
24
FM BAND
COVERAGE fL
BIAS OSC.
1
2
3
4
MAIN PWB
