– 11 –
CD-C422/C422C/C2800/C2800C
CF351
T301
IC302
T382
T302
CF301
IC301
L301
L312
CNP301
3
2
1
TP302
TP303
TP301
T333
VR381
T331
IC303
1
1
1
FM BAND
COVERAGE fL
FM RF
FM
AM LOOP ANTENNA
FM IF
AM TRACKING
fL
VCO
AM IF
FM DET
AM BAND
COVERAGE fL
13
17
21
20
MAIN PWB
MECHANISM SECTION
•
Driving Force Check
Torque Meter
Specified Value
Play: TW-2412
Tape 1: Over 80 g
Tape 2: Over 80 g
•
Torque Check
Torque Meter
Tape 2
Play: TW-2111
30 to 60 g. cm
30 to 60 g.cm
Fast forward: TW-2231
—
60 to 120 g.cm
Rewind: TW-2231
—
60 to 120 g.cm
Specified
Value
Adjusting
Point
Instrument
Connection
Test Tape
Normal
MTT-111
Volume in
3,000 ±
Speaker
speed
motor.
30 Hz
terminal
(MM1)
(Load
resistance:
8 ohms)
ADJUSTMENT
Specified Value
Tape 1
•
Tape Speed
•
AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
*1. Input: Antenna,
Output: TP302
*2. Input: Antenna,
Output: TP301
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
IF
450 kHz
1,720 kHz
T381
*1
Band
—
530 kHz
(fL): T333
*2
Coverage
1.1 ± 0.1 V
Tracking
990 kHz
990 kHz
(fL): T331
*1
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
*1. Input: Antenna,
Output: TP301
*2. Input: Antenna,
Output: Speaker terminal
•
FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Band
—
87.50 MHz T301(fL):
*1
Coverage
1.3 V ± 50 mV
RF
98.00 MHz 98.00 MHz L312
*2
(10-30 dB)
Test Stage
Instrument
Connection
Frequency Frequency
Display
Serring/
Adjusting
Point
•
Detection
Signal generator: 10.7 MHz, FM sweep generator
Detection 10.7 MHz
98.00 MHz
T382
Input: Pin 1 of
IC303
Output: TP302
IF
10.7 MHz
98.00 MHz
T302(Turn
Input: Pin 1 of
the core of
IC301
transformer Output: TP302
T381 fully
counter-
clookwise.)
Instrument
Connection
Test
Stage
Adjusting
Parts
Frequency
Display
Frequency
Adjusting
Parts
Instrument
Connection
Frequency
Display
Frequency
•
VCO Frequency
* Adjust for 76 kHz ± 200 Hz.
Notes:
After preparing the test circuit shown in Fig 11-2, connect the
Pin 13 , Pin 21 and ground of the IC303 with test circuit, and
measure the Value.
At this time, apply a standard unmodulated signal input and
adjust the VCO.
Pin 13 of IC303
Pin 21 of IC303
D
G
S
10 k
Ω
TO FREQUENCY
COUNTER
FET : 2SK19 or 2SK54
Figure 11-2
TAPE MECHANISM
MM 1
Motor
Volume in motor
98.00 MHz
98.00 MHz
VR381*
Pin 13, Pin 21
(60 dB)
and ground
of IC303
Figure 11-1 ADJUSTMENT POINTS