Adjustment - Sharp CD-C602 Service Manual

MECHANISM SECTION
• Driving Force Check
Torque Meter
Play: TW-2412
• Torque Check
Torque Meter
Play: TW-2111 30 to 60 g. cm
Fast forward: TW-2231 80 to 135 g.cm
Rewind: TW-2231 80 to 135 g.cm
• Tape Speed
Test Tape Adjusting
Point
Normal MTT-111 Volume in
speed motor
TAPE MECHANISM
Volume in motor
Figure 9-1 ADJUSTMENT POINTS
AM IF
T351
TP303
IC351
21
13
TP301
+
VR351
T352
VCO
FM Detection
TP302
MAIN PWB
Figure 9-2 ADJUSTMENT POINTS
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ADJUSTMENT

Specified Value
Tape 1: Over 100 g
Tape 2: Over 50 g
Specified Value
Tape 1 Tape 2
30 to 60 g.cm
—
—
Specified Instrument
Value Connection
3,000 ±
Speaker
30 Hz terminal
(Load
resistance:
4 ohms)
AM Tracking fL
AM Band
Coverage fL
T333
FM Band
Coverage fL
T331
L303
T301
CNP301
FM/AM
ANTENNA
FM IF
TERMINAL
1
IC301
L302
FM RF
L301
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Test Stage Frequency
IF 450 kHz
Band —
Coverage
Tracking 990 kHz
*1. Input: Antenna (CNP301), Output: TP302
*2. Input: Antenna (CNP301), Output: TP301
• FM RF
Signal generator: 1 kHz, 22.5 kHz dev., FM modulated
Frequency Frequency
Test Stage
Band —
Coverage
RF 98.00 MHz 98.00 MHz L302
(10-30 dB)
*1. Input: Antenna (CNP301), Output: TP301
*2. Input: Antenna (CNP301), Output: Speaker terminal
• FM Detection
Signal generator: 10.7 MHz, FM sweep generator
Test Frequency Frequency
Stage
Detection 10.7 MHz 98.00 MHz T352
IF 10.7 MHz 98.00 MHz T301(Turn
• VCO Frequency
Frequency Frequency
Display
98.00 MHz 98.00 MHz
(60 dB)
* Adjust for 76 kHz ± 200 Hz.
Notes:
After preparing the test circuit shown in Fig 9-3, connect the
Pin 13 , Pin 21 and ground of the IC351 with test circuit, and
measure the Value.
At this time, apply a standard unmodulated signal input and
adjust the VCO.
Pin 13 of IC351 Pin 21 of IC351
FET : 2SK19 or 2SK54
D
G
S
10 kohm
– 9 –
CD-C602,CP-C602
Frequency
Setting/ Instrument
Display Adjusting
Connection
Parts
1,720 kHz T351 *1
530 kHz (fL): T333 *2
1.1 ± 0.1 V
990 kHz (fL): T331 *1
Serring/ Instrument
Display Adjusting Connection
Point
87.50 MHz L303(fL): *1
1.3 V ± 0.1 V
*2
Adjusting Instrument
Display
Parts Connection
Input: Pin 1 of
IC301
Output: TP302
Input: Pin 1 of
the core of IC301
transformer Output: TP302
T352 fully
counter-
clookwise.)
Adjusting Instrument
Parts Connection
VR351* Pin 13, Pin 21
and ground
of IC351
TO FREQUENCY
COUNTER
Figure 9-3