Adjustment - Sharp CD-C602 Service Manual

MECHANISM SECTION
• Driving Force Check
Torque Meter
Play: TW-2412
• Torque Check
Torque Meter
Play: TW-2111
Fast forward: TW-2231
Rewind: TW-2231
• Tape Speed
Adjusting
Test Tape
Normal MTT-111 Volume in
speed motor
TAPE MECHANISM
Volume in motor
Figure 9-1 ADJUSTMENT POINTS
AM IF
T351
TP303
IC351
21
13
+
VR351
T352
VCO
FM Detection
TP302
MAIN PWB
Figure 9-2 ADJUSTMENT POINTS
Specified Value
Tape 1: Over 100 g
Tape 2: Over 50 g
Specified Value
Tape 1
Tape 2
30 to 60 g. cm 30 to 60 g.cm
80 to 135 g.cm —
80 to 135 g.cm —
Specified Instrument
Point 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
TP301
T301
FM IF
1
IC301
L302
FM RF
L301

ADJUSTMENT

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