Chapter 2. Adjustments; Adjustment - Sharp CD-MPS440W Service Manual

CD-MPS440W
CHAPTER 2.
CD-MPS440W
ADJUSTMENTS

[1] ADJUSTMENT

1. MECHANISM SECTION
• Driving Force Check
Torque Meter
Play: DM-300
• Torque Check
Torque Meter
Play: DM-300 10 to 20 g.cm
Fast forward: DM-300 —
Rewind: DM-300 —
• Tape Speed
Test Tape Adjust-
ing Point
Tape TCC-119 Variable
speed Resistor in
motor.
TAPE MECHANISM
Variable Resistor in Motor
Figure 1 ADJUSTMENT POINTS
2. TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Test Stage Frequency Frequency
IF 450 kHz 1,620 kHz
AM Band — 522 kHz
Coverage
AM Tracking 990 kHz 990 kHz
*1. Input: Antenna
*2. Input: Input is not connected
Specified Value
Tape 1: Over 80 g
Tape 2: Over 80 g
Specified Value
Tape 1 Tape 2
10 to 20 g.cm
Over 50 g.cm
Over 50 g.cm
Specified Instrument
Value Connection
3,000 ± 30 Hz
Speaker Ter-
minal (Load
resistance: 6
ohms)
Tape
Motor
Setting/ Instrument
Display Adjusting Connection
Parts
T351 *1
(fL): T306 *2
1.1 ± 0.1 V
T302 *1
Output: Speaker terminal
Output: TP301
• Check FM VT
Service Manual
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display
87.5 MHz 87.5 MHz
108 MHz 108 MHz
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display
98.00 MHz 98.00 MHz
(30 dBµV)
*1. Adjust so that an output signal appears.
• FM Detection
Signal generator: 10.7MHz FM modulated
Test Frequency
Stage
FM IF 10.7 MHz
• FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Test Frequency
Stage
FM Band —
Coverage
FM RF 98.00 MHz
(10-30 dB)
*1. Input: Antenna Output: TP301
*2. Input: Antenna Output: Speaker terminal
TP302
Figure 2 ADJUSTMENT POINTS
2 – 1
Check Instrument
Point Connection
2.2V ± 1.0V TP301
7.8V ± 1.0V TP301
Adjusting Instrument
Parts Connection
VR351*1 Input: CNP301
Output: Speaker Terminal
Frequency Setting/
Display Adjusting
Point
98.00 MHz T304
(Turn the
core of trans-
former T304
fully counter-
clockwise)
Frequency Setting/
Display Adjusting
Point
87.50 kHz (fL):L303
3.4 ± 0.1 V
98.00 MHz L302
MAIN PWB
TP301
R381
IC302
FM BAND
COVERAGE fL L303
T351
AM IF FM MUTE
T304
Level
IC301
L302
FM RF
T302
T306
AM BAND
COVERAGE fL AM TRACKING
fL
Instrument
Connection
Input: Pin 1
of IC301
Instrument
Connection
*1
*2
CNP301