Sharp XL-520H - Adjustment

– 9 –
XL-520H,520E/CP-520,520E
MECHANISM SECTION
• Driving Force Check
Torque Meter
Specified Value
Play: TW-2412 Over 80 g
• Torque Check
Torque Meter
Play: TW-2111 30 to 70 g. cm
Fast forward: TW-2231 50 to 140 g.cm
Rewind: TW-2231 50 to 140 g.cm
Specified
Value
Adjusting
Point
Instrument
Connection
Test Tape
MTT-111 Motor 3,000 ± Headphone
90 Hz terminal
ADJUSTMENT
Specified Value
• Tape Speed
fL: Low-range frequency
fH: High-renge frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
IF 450 kHz 1,620 kHz T351 *1
MW Band — 522 kHz (fL): T306 *2
Coverage 1.1 ± 0.1 V
LW Band — 153 kHz (fL): T305 *2
Coverage 1.1 ± 0.1 V
MW 990 kHz 990 kHz (fL): T302 *1
Tracking
LW 225 kHz 225 kHz (fL): T301 *1
Tracking
Test Stage
Frequency Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
Adjusting
Parts
Instrument
Connection
Display
Frequency
98.00 MHz 98.00 MHz VR351*1 Input: SO301
(25 dBµV) Output: Speaker
Terminal
Figure 9-1 ADJUSTMENT POINT
TUNER SECTION
TAPE MECHANISM
M901
Motor
Volume in motor
*1. Input: Antenna, Output: Speaker Terminal
*2. Input: Input is not connected, Output: TP301
• Setting the Test Mode
Keeping the BAND button and MEMORY button pressed, turn
on POWER. Then, the frequency is initially set in the memory
as shown in Table. Call it with the , button to use it
for adjustment and check of tuner circuit.
Preset No. FM
Preset No.
MW
1 87.50 MHz 6 522 kHz
2 108.00 MHz 7 1,620 kHz
3 98.00 MHz 8 990 kHz
4 90.00 MHz 9 603 kHz
5 106.00 MHz 10 1,404 kHz
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Adjust so that an output signal appears.
Figure 9-2 ADJUSTMENT POINTS
MAIN PWB
ANTENNA
TERMINAL
T351
R331
CNP301
FE301
VR351
FM MUTE
LEVEL
AM IF
TP301
TP302
SO301
T302
T301
MW
TRACKING
T306
MW BAND
COVERAGE
T305
LW BAND
COVERAGE
LW
TRACKING
Check Point Instrument
Connection
Display
Frequency
87.5 MHz 87.5 MHz 2.2 V ± 0.7 V TP301
108 MHz 108 MHz 7.3 V ± 1.0 V TP301
• Check FM VT
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Preset No.
LW
11 153 kHz
12 281 kHz
13 225 kHz
14 162 kHz
15 261 kHz