Chapter 2. Adjustments; Adjustment - Sharp XL-MP40H Service Manual

XL-MP40H
E Market XLMP40H Service Manual XL-MP40H Audio
CHAPTER 2.
ADJUSTMENTS

[1] ADJUSTMENT

1. MECHANISM SECTION
• Driving Force Check
Torque Meter
Play: TW-2412
• Torque Check
Torque Meter
Play: TW-2111
Fast forward: TW-2231
Rewind: TW-2231
• Tape Speed
Test Tape Adjusting
Point
MTT-111 Variable Resis-
tor in motor.
TAPE MECHANISM
Figure 1
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 1,602 kHz
AM Band — 522 kHz
Coverage
AM Tracking 990 kHz 990 kHz
*1. Input: IC301 1Pin Output: IC301 23Pin
*2. Input: Input is not connected
*3. Input: Antenna Output:IC301 23Pin
• Check FM VT
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display
87.5 MHz 87.5 MHz
108 MHz 108 MHz
Specified Value
Over 80 g
Specified Value
30 to 60 g.cm
55 to 140 g.cm
55 to 140 g.cm
Specified Value Instrument
Connection
3,000 ± 30 Hz Headphone
Terminal
M901
Tape
Motor
Variable
resistor
in motor
Setting/ Instrument
Display Adjusting Connection
Parts
L305 *1
(fL): L306 *2
1.1 ± 0.1 V
L302 *3
Output: TP-VT (IC301 28Pin)
Check Point Instrument
Connection
1.5V ± 1.0V TP-VT
5.0V ± 1.0V TP-VT
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display
98.00 MHz 98.00 MHz
(30 dBµV)
• FM Detection
Signal generator: 10.7 MHz FM sweep generator
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 ~ 30dB)
*1. Input: Antenna Output: 23 Pin of IC301
FM OSC.
FM BAND
COVERAGE fL
Figure 2 ADJUSTMENT POINTS
2 – 1
Adjusting Instrument
Parts Connection
- Input: CNP301
Output: Speaker Terminal
Frequency Setting/ Instrument
Display Adjusting Connection
Parts
98.00 MHz - Input: Pin 36 of
IC301
Output: Pin 23
of IC301
Frequency Setting/
Display Adjusting
Parts
87.50 MHz (fL): L307
1.5 ± 0.1 V
98.00 MHz L304
MAIN PWB-A1
AM ANT.
AM BAND
COVERAGE fL
AM
FM RF
Tracking
TP-VT=28Pin
36 28 23
AM IF
Instrument
Connection
*1
*1