Service manual

CD-SW250DVD
2 – 1
AudioCD-SW250DVDService ManualCD-SW250DVDMarketE
CHAPTER 2. ADJUSTMENTS
[1] Mechanism section
• Driving Force Check
• Torque Check
• Tape Speed
[2] Tuner section
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
•FM RF
Signal generator: 1 kHz, 40 kHz dev., FM modulated
•FM IF
Signal generator: 10.7 MHz, FM modulated
Torque Meter Specified Value
Play: TW-2111 Tape 1: Over 80 g
Tape 2: Over 80 g
Torque Meter Specified Value
Tape 1 Tape 2
Play: TW-2111 30 to 80 g.cm 30 to 80 g.cm
Fast forward: TW-2231 — 70 to 180 g.cm
— 70 to 180 g.cm
Test Tape Adjust-
ing Point
Specified
Value
Instrument
Connection
Normal
speed
MTT-111 Variable
Resistor in
motor.
3,000 ± 30 Hz
Speaker
Speaker Ter-
minal (Load
resistance: 6
ohms)
Figure 1
Test Stage Frequency Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
AM IF 450 kHz 1,620 kHz T351 *1
AM Band
Coverage
— 522 kHz (fL): T306
1.1 ± 0.1 V
*2
AM
Tracking
990 kHz 990 kHz (fL): T303 *1
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
TAPE MECHANISM
Tape
Motor
Variable Resistor in motor
Test
Stage
Frequency Frequency
Display
Setting/
Adjusting
Point
Instrument
Connection
FM Band
Coverage
— 87.50 MHz T301 (fL):
1.3 V ± 0.1 V
*1
FM RF 98.00 MHz
(10-30 dB)
98.00 MHz L312 *2
*1. Input: Antenna Output: TP301
*2. Input: Antenna Output: Speaker terminal
Test
Stage
Frequency Frequency
Display
Setting/Adjust-
ing Point
Instrument
Connection
IF 10.7 MHz 98 MHz T302 (Turn the
core of trans-
former T302
fully counter
clockwise)
*1
*1. Input: Antenna Output: TP301
Figure 2 Adjustment Points
TUNER PWB
T301
FM OSC
T351
T303
T306
T302
IC301
S0301A
FM ANTENNA
TERMINAL
AM LOOP
ANTENNA
CNP302
AM OSC
AM IF
FM IF
FM RF
AM ANTENNA
R357
R380
FM BAND
COVERAGE fL
AM BAND
COVERAGE fL
L312
IC302
TUNER PWB
T301
FM OSC
T351
T303
T306
T302
IC301
S0301A
FM ANTENNA
TERMINAL
AM LOOP
ANTENNA
CNP302
AM OSC
AM IF
FM IF
FM RF
AM ANTENNA
R357
R380
FM BAND
COVERAGE fL
AM BAND
COVERAGE fL
L312
IC302