Adjustment - Sharp QT-CD111H Service Manual

MECHANISM SECTION
• Driving Force Check
Torque Meter
PLAY: TW-2412 Over 120 g
• Torque Check
Torque Meter
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
Torque Meter
MTT-114 Output: Speaker Terminal
(CNP201 Load resistance: 8 ohms)
• Tape Speed
Adjusting
Test Specified
Point
Tape
3,000 ± 90 Hz
MTT-111 In motor
TAPE SECTION
Position of each switch or control
Volume control
Function switch
X-BASS
• Bias Oscillation
Adjustment Point Specified Value
82 kHz ± 6 kHz
L301
– 6 kHz
• Playback Amplifier Sensitivity Check
Test Tape Specified Value
1.8 V ± 3 dB
MTT-118
Pin 13 of IC2 Pin 21 of IC2
FET : 2SK19 or 2SK54
D
G
S
10 kohm
Figure 7-1 VCO FREQUENCY TEST CIRCUIT
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ADJUSTMENT

Specified Value
Specified Value
Specified Value
Instrument
Value Connection
Output: Speaker
Teaminal
(CNP201 Load
resistance: 8 ohms)
Max
Tape/Power Off
On
Instrument
Connection
Pin 2 of CNP201
Instrument Connection
Speaker Terminal
(Load resistance: 8 ohms)
TO FREQUENCY
COUNTER
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• FM IF/RF
Test Stage
Value/Adjusting
IF T1
Detection T2
Band Coverage fL: L2
fH: TC2
Tracking 88.0 MHz: L1
108.0 MHz: TC1
• AM IF/RF
Test Stage
Value/Adjusting
IF T3
Band Coverage fL: L4
fH: TC4
Tracking 600 kHz: L3
1,400 kHz: TC3
• VCO Frequency
Adjusting Point
76 kHz ± 200 Hz
VR1
Note:
After preparing the test circuit shown in Fig. 7-1, connect the
Pin 13, Pin 21 and ground of the IC2 with the test circuit, and
measure the value. At this time, apply a standard unmodulated
signal input and adjust the VCO.
MAIN PWB
AM
TRACKING
FM ROD ATENNA
fL
VR1
VCO
FM
DETECTION
L4
L2
TC4
TC2
TC3
TC1
AM
TRACKING
fH
fH fL fH
AM BAND FM
TRACKING
COVERAGE
Figure 7-2 ADJUSTMENT POINTS
– 7 –
QT-CD111H/110H
Specified Instrument
Connection
Point
Input: Pin 1 of IC1
Output: Pin 17 of IC2
Iuput: Antenna
Output: Speaker
Terminal (CNP201
Load resistance: 8
ohms)
Instrument
Specified
Connection
Point
Input: Antenna
Output: Pin 19 of IC2
Input: Antenna
Output: Speaker
Terminal (CNP201
Load resistance: 8
ohms)
Specified Instrument
Value Connection
Pin 13, pin 21 and
ground of IC2
13
17
IC2
T3
T2
19
21
1
AM IF
T1
IC1
FM IF
L1
1
fL fH fL
FM BAND
COVERAGE