Read Sharp QT-CD50H (serv.man3) Service Manual online
QT-CD50
Figure 5 ADJUSTMENT POINTS
– 5 –
Torque Meter
Specified Value
Play: TW-2412
Over 120 g
MECHANISM SECTION
• Driving Force Check
Torque Meter
Specified Value
• Torque Check
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
• Head Azimuth
MTT-114
Output: Speaker Terminal
(Load resistance: 6
ohms)
ohms)
Test Tape
Instrument Connection
• Tape Speed
Instrument
Connection
Normal
MTT-111
3,000
±
Speaker
Speed
30 Hz
terminal
(Load
resistance:
6 ohms)
(Load
resistance:
6 ohms)
Specified Value
Test Tape
* Open the cassette holder, and load the test tape directly into
the mechanism. (Do not load the tape into the cassette
holder.)
holder.)
Torque Meter
Specified Value
Beat Cancel
A: 80 kHz + 10 kHz/-6kHz
B: -3
B: -3
±
1 kHz for A
C: -5
±
2 kHz for A
DECK SECTION
• Bias Oscillation Check
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
fH: High-renge frequency
• VCO Frequency
Frequency
Adjusting
Parts
Frequency Display
Without modulation VR301
456 kHz
CT303
T303
T301
VR301
T302
CT302
CT304
CT301
L305
L307
L302
L306
FM IF
FM DETECTION
AM IF
VCO
AM
TRACKING
TRACKING
fL
fH
AM BAND
COVERAGE
COVERAGE
fL
fH
FM BAND
COVERAGE
COVERAGE
fH
fL
FM
TRACKING
TRACKING
fL
fH
IC301
1
8
9
11
16
TUNER PWB
• FM IF/RF
Specified Value/
Adjusting
Point
• AM IF/RF
Test Stage
Specified Value/
Adjusting
Point
IF
T302
Input: Antenna
Output: Pin 11 of IC301
Output: Pin 11 of IC301
Band
fL: L306
Input: Antenna
Coverage
fH: CT304
Output: Earphon Jack
Tracking
fL(526.5kHz): L302
(Load resistance:
fH(1,606.5 kHz): CT303
32 ohms)
Instrument
Connection
Test Stage
Instrument
Connection
IF
T301
Input: Pin 1 of IC301
Detection
T303
Output:Pin 11 of IC301
Band
fL: L307
Input: Antenna
Cverage
fH: CT302
Output: Earphon Jack
Tracking
fL(88.0 MHz): L305
(Load resistance:
fH(108.8 MHz): CT301
32 chms)
ADJUSTMENT
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