Adjustment - Sharp XL-30H Service Manual

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
Adjusting
Test Tape
Point
MTT-111 Variable
resistor in
motor.(M901)
TAPE MECHANISM
Figure 13-1 ADJUSTMENT POINT
TUNER SECTION
fL: Low-renge frequency
fH: High-renge frequency
• AM IF/RF (For XL-30H)
Signal generator: 400 Hz, 30%, AM modulated
Display
Frequency Frequency
IF 450 kHz 1,620 kHz
AM Band — 522 kHz
Coverage
AM 990 kHz 990 kHz
Tracking
• AM IF/RF (For XL-30W)
Signal generator: 400 Hz, 30%, AM modulated
Test Stage Frequency Frequency
Display
AM IF 450 kHz 1,602 kHz
AM Band — 531 kHz
Coverage
AM Tracking 990 kHz 990 kHz
*1. Input: Antenna, Output: Speaker Terminal
*2. Input: Input is not connected,
Span selectors are to be 9 kHz (AM), 50 kHz (FM).
• Check FM VT (XL-30H/30W)
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display
87.5 MHz 87.5 MHz
108 MHz 108 MHz
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ADJUSTMENT

Specified Value
Over 80 g
Specified Value
30 to 60 g. cm
55 to 140 g.cm
55 to 140 g.cm
Specified Instrument
Value
Connection
3,000 ±
Headphone
90 Hz terminal
M901
Tape
Motor
Variable
resistor
in motor
Setting/ Instrument
Adjusting Connection
Parts
T351 *1
(fL): T306 *2
1.1 ± 0.1 V
T302 *1
Setting/ Instrument
Adjusting Connection
Parts
T351 *1
(fL): T306 *2
1.1 ± 0.1 V
T302 *1
Output: TP301
Check Point Instrument
Connection
3.4 V ± 1.0 V
TP301
7.8 V ± 1.0 V
TP301
• FM Mute Level (For XL-30W)
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Display
Frequency
98.00 MHz 98.00 MHz
(25 dBµV)
*1. Adjust so that an output signal appears.
• FM Mute Level (For XL-30H)
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Display
Frequency
98.00 MHz 98.00 MHz
(30 dBµV)
*1. Adjust so that an output signal appears.
• FM Detection (XL-30H/W)
Signal generator: 10.7 MHz, FM sweep generator
Test Frequency Frequency
Stage
FM IF 10.7 MHz 98.00 MHz
• FM RF (XL-30H/W)
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Test Stage Frequency
FM Band —
Coverage
FM RF 98.00 MHz
(10~30 dB)
*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker Terminal
MAIN PWB
FM Mute
Level
AM IF
VR351
T351
CF352
TP301
IC303
R336
T306
AM Band
Coverage fL
Figure 13-2 ADJUSTMENT POINTS
– 13 –
XL-30H/30W
Adjusting Instrument
Parts
Connection
VR351*1 Input: SO301
Output: Speaker
Terminal
Adjusting Instrument
Parts Connection
VR351*1 Input: CNP301
Output: Speaker
Terminal
Setting/ Instrument
Display
Adjusting Connection
Parts
T304(Turn Input: Pin 1 of
the core of IC301
T304 fully
counter-
clockwise).
Frequency
Setting/ Instrument
Display
Adjusting Connection
Parts
87.50 MHz (fL): L303 *1
3.4 ± 0.1 V
98.00 MHz L302 *2
IC302 SO301
ANTENNA
SOCKET
(XL-30W
Only)
FM Band
Coverage fL
L303
9
T304
IC301
FM IF
BF301
1
FM RF
L302
CNP301
ANTENNA
T302
SOCKET
AM
Tracking