Sharp XL-30V Service Manual page 14

Video cd micro system
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XL-30V
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 14-1 ADJUSTMENT POINT
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Test Stage Frequency
AM IF
450 kHz
AM Band
Coverage
AM Tracking 990 kHz
*1. Input: Antenna
*2. Input: Input is not connected
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency
Display
98.00 MHz
98.00 MHz
(25 dBµV)
*1. Adjust so that an output signal appears.
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 ± 90 Hz
Headphones
jack
M901
Tape
Motor
Variable
resistor
in motor
Frequency
Setting/
Instrument
Display
Adjusting
Connection
Parts
1,602 kHz
T351
*1
531 kHz
(fL): T306
*2
1.1 ± 0.1 V
990 kHz
T302
*1
Output: Speaker Terminal
Output: TP301
Adjusting
Instrument
Parts
Connection
VR351 *1
Input: SO301
Output: Speaker
Terminal
• 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 Stage Frequency
FM Band
Coverage
FM RF
98.00 MHz
(10~30 dB)
*1. Input: Antenna
*2. Input: Antenna
• Setting the Test Mode
Keeping the FF/FWD 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 Jog volume button
by pressing the VOLUME/JOG button to use it for adjustment
and check of tuner circuit.
Preset No.
FM STEREO
1
87.50 MHz
2
108.00 MHz
3
98.00 MHz
4
90.00 MHz
5
106.00 MHz
Preset No.
BAND
11~25
MAIN PWB
FM Mute
Level
T351
VR351
AM IF
TP301
R336
T306
AM Band
Coverage fL
Figure 14-2 ADJUSTMENT POINTS
– 14 –
Frequency
Setting/
Display
Adjusting
Parts
98.00 MHz
T304 (Turn Input: Pin 1 of
the core of IC301
T304 fully
counter-
clockwise).
Frequency
Setting/
Display
Adjusting
Parts
87.50 MHz
(fL): L303
3.4 ± 0.1 V
98.00 MHz
L302
Output: TP301
Output: Speaker Terminal
Preset No.
6
7
8
9
10
Preset No.
26
27
28
29
30
FM Band
Coverage fL
L303
9
T304
IC301
FM IF
1
FM RF
L302
T302
AM
Tracking
Instrument
Connection
Instrument
Connection
*1
*2
AM
531 kHz
1,602 kHz
990 kHz
603 kHz
1,404 kHz
FM MONO
106.00 MHz
90.00 MHz
98.00 MHz
108.00 MHz
87.50 MHz
SO301
FM ANTENNA
CNP301
AM ANTENNA

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