Adjustment; Mechanism Section; Tape Mechanism; Tuner Section - Kenwood RXD-A55 Service Manual

RXD-A55/A75

MECHANISM SECTION

• Driving Force Check
Torque Meter
Play: TW-2111
• Torque Check
Torque Meter
Play: TW-2111
Fast forward: TW-2231
Rewind: TW-2231

TUNER SECTION

fL: Low-range frequency
fH: High-renge frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Frequency
Test Stage
AM IF 450 kHz
AM Band —
Coverage
AM Tracking 990 kHz
*1. Input: Antenna, Output: TP302
*2. Input: Antenna, Output: TP301
16

ADJUSTMENT

Specified Value
Tape 1: Over 80 g
Tape 2: Over 80 g
Specified Value
Tape 1
Tape 2
30 to 80 g. cm 30 to 80 g.cm
— 70 to 180 g.cm
— 70 to 180 g.cm
Frequency
Setting/ Instrument
Display Adjusting Connection
Parts
1,720 kHz T351 *1
530 kHz (fL): T306 *2
1.1 ± 0.1 V
990 kHz (fL): T303 *1
R381
TP301
FM BAND
COVERAGE fL
Figure 12-1 ADJUSTMENT POINT
• Tape Speed
Test Tape
Normal MTT-111
speed

TAPE MECHANISM

Variable Resistor in motor
• FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Frequency Frequency
Test Stage
FM Band —
Coverage
FM RF 98.00 MHz 98.00 MHz
(10-30 dB)
*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker terminal
CNP301
AM LOOP
ANTENNA
TUNER PWB
1 T303
AM
IC301
TRACKING fL
L312
T302
T306
FM IF
FM RF
T301
AM BAND
COVERAGE fL
T351
AM IF
TP302
Adjusting Specified
Value
Point
3,000 ±
Variable
Resistor in 30 Hz
motor.
(MM1)
MM1
Motor
Figure 11-3
Serring/
Display Adjusting
Point
87.50 MHz T301(fL):
1.3 V ± 50 mV
L312
R357
Instrument
Connection
Speaker
terminal
(Load
resistance:
6 ohms)
Instrument
Connection
*1
*2