Chapter 2. Adjustments Adjustment - Sharp XL-MP130 Service Manual

XL-MP130
CHAPTER 2. E Market XLMP130 Service Manual XL-MP130 Audio
ADJUSTMENTS
[1] ADJUSTMENT
1. MECHANISM SECTION
• Driving Force Check
Torque Meter
Play: TW-2111 Over 80 g
• Torque Check
Torque Meter
Play: TW-2111 30 to 80 g.cm
Fast forward: TW-2231 70 to 180 g.cm
Rewind: TW-2231 70 to 180 g.cm
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
AM IF 450 kHz 1,602 kHz
AM Band — 531 kHz
Coverage
AM Tracking 990 kHz 990 kHz
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
• FM RF
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Test Stage Frequency Frequency
FM Band — 87.50 kHz
Coverage
FM RF 98.00 MHz 98.00 MHz
(10-30 dB)
*1. Input: Antenna Output: TP301
*2. Input: Antenna Output: Speaker terminal
• FM IF
Signal generator: 10.7MHz FM modulated
Test Stage Frequency Frequency
Display
IF 10.7 MHz 98 MHz
*1. Input: Antenna Output: TP301
Specified Value
Specified Value
Setting/ Instrument
Display Adjusting Connection
Parts
T351 *1
(fL): T306 *2
1.1 ± 0.1 V
(fL): T303 *1
Setting/ Instrument
Display Adjusting Connection
Point
T301 (fL): *1
1.3 ± 0.1 V
L312 *2
Setting/ Instrument
Adjusting Connection
Point
T302 *1
(Turn the
core of trans-
former T302
fully counter-
clock wise)
• Tape Speed
Test Tape
Normal MTT-111
speed
TAPE MECHANISM
Variable Resistor in motor
TUNER PWB-C
20
Figure 2 ADJUSTMENT POINTS
3. CD SECTION
• Adjustment
Since this CD system incorporates the following automatic adjust-
ment functions, readjustment is not needed when replacing the
pickup. Therefore, different PWBs and pickups can be combined
freely.
Each time a disc is changed, these adjustments are performed
automatically. Therefore, playback of each disc can be performed
under optimum conditions.
Items adjusted automatically
1) Offset adjustment (The offset voltage between the head amplifier
output and the VREF reference voltage is compensated inside the
IC.)
* Focus offset adjustment
* Tracking offset adjustment
2 – 1
Adjusting Specified
Point Value
Variable 3,000 ± 30 Hz
Resistor in
motor.
Tape
Motor
Figure 1
SO302
FM ANTENNA
AM
TERMINAL
LOOP
ANTENNA
CNP301
AM TRACKING fL
IC301
L312
T303
T306
TP301
FM RF
C393 T302
FM IF
AM BAND
COVERAGE fL
T301
FM OSC
T351
AM IF
TP302
Instrument
Connection
Speaker Ter-
minal (Load
resistance: 6
ohms)