DOWNLOAD Sharp SM-SX1 (serv.man2) Service Manual ↓ Size: 3.11 MB | Pages: 56 in PDF or view online for FREE

Model
SM-SX1 (serv.man2)
Pages
56
Size
3.11 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio / System / (including circuit diagrams and s)
File
sm-sx1-sm2.pdf
Date

Sharp SM-SX1 (serv.man2) Service Manual ▷ View online

SM-SX1H
– 1 –
SM-SX1H
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
SERVICE MANUAL
SHARP  CORPORATION
No. S6056SMSX1H//
 CONTENTS
Page
IMPORTANT SERVICE NOTES (FOR U.K. ONLY) ........................................................................................................... 2
SPECIFICATIONS .............................................................................................................................................................  2
NAMES OF PARTS ...........................................................................................................................................................  3
OPERATION MANUAL ......................................................................................................................................................  4
DISASSEMBLY ..................................................................................................................................................................  6
ADJUSTMENT ...................................................................................................................................................................  8
WIRING PROCESS DIAGRAM .......................................................................................................................................  10
WIRING OF PRIMARILY SUPPLY LEADS (FOR U.K. ONLY) .......................................................................................  11
BLOCK DIAGRAM ...........................................................................................................................................................  12
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD .............................................................................................. 14
NOTES ON SCHEMATIC DIAGRAM ..............................................................................................................................  32
TYPES OF TRANSISTOR AND DIODE ..........................................................................................................................  32
WAVEFORMS OF CD CIRCUIT ......................................................................................................................................  33
TROUBLESHOOTING .....................................................................................................................................................  34
FUNCTION TABLE OF IC ................................................................................................................................................  37
PARTS GUIDE/EXPLODED VIEW/PACKING METHOD (FOR U.K. ONLY)
SACD
DIGITAL1 DIGITAL2
LINE1
LINE2
MODEL
1-BIT AMPLIFIER
SM-SX1H
– 2 –
Specifications for this model are subject to change without
prior notice.
SPECIFICATIONS
IMPORTANT SERVICE NOTES (FOR U.K. ONLY)
Before returning the unit to the customer after completion of a
repair or adjustment it is necessary for the following withstand
voltage test to be applied to ensure the unit is safe for the
customer to use.
Setting of Withstanding Voltage Tester and set.
Set name
set value
Withstanding Voltage Tester
Test voltage
2,120 VPEAK
1,500 VRMS
Set time
60 secs
Set current(Cutoff current)
4 mA
Unit
Judgment
OK: The “GOOD” lamp lights.
NG: The “NG” lamp lights and the buzzer sounds.
SHORT-CIRCUIT
AC POWER 
SUPPLY CORD
CONNECT THE PROBE
TO GND 
OF CHASSIS
SCREW
 PROBE
AC
UNIT
WITHSTANDING
VOLTAGE TESTER
+
-
OUT
Rated output power:
RMS; 50 W + 50 W (DIN 45 500)
Total harmonic distortion:
0.02 % (1 kHz, 1 W)
Frequency response:
5 Hz - 20 kHz (+1 dB, -1 dB)
5 Hz - 100 kHz (+1 dB, -3 dB)
Dynamic range:
100 dB (10 Hz - 20 kHz)
A/D noise shaping:
7th-order 
 (delta-sigma) modulation
Input terminals:
DIGITAL1; RCA coaxial
DIGITAL2; Square type optical
SACD; RCA analog, 1 BIT digital
LINE 1,2; RCA analog (350 mV rms/50 k ohms)
Output terminals:
DIGITAL OUT; Square type optical
LINE OUT; RCA analog
Speakers; 8 ohms
Power source:
Dimensions:
Width;
300 mm (11-13/16”)
Height;
2
66 mm (2-5/8”)
Depth;
411 mm (16-3/16”)
Weight:
Approx.
6.8 kg (15.0 lbs.)
Power source; 230V, 50Hz
Power consumption; 55W
SM-SX1H
– 3 –
NAMES OF PARTS
SACD
DIGIT
AL1
DIGIT
AL2
LINE1
LINE2
3
2
4
1
4
V
olume Control Knob
Controls the sound level.
T
o
 cut the output to the speaker with the
power turned on:
Set the sound level at “0” then press and
hold the corresponding input selector but-
ton for 2 seconds or more.
The signal output to the speaker returns
when you reset the sound level at “1” or
higher
.
1
Power Button
T
urns the unit on or of
f.
2
Input Selector Buttons
Used to select the equipment source you
want to play back.
When the power is turned on, the unit is
switched to “SACD”.
3
V
olume Display
Displays the sound level within the range of
“0” - “128”.
2
L
ine 1 Input T
erminals
Connect equipment using RCA cords.
3
Line 2 I
nput T
erminals
Connect equipment using RCA cords.
1
Line Output T
erminals
Connect equipment using RCA cords.
4
SACD/1-bit Signal Input T
erminals
Connect the super audio CD player using
RCA cords or the 1-bit signal cable included
with your Sharp SACD player
.
When both the RCA cords and the 1-bit
signal cable are connected, signals from
the latter have priority
.
When nothing is connected to the 1 BIT in-
put terminal, signals from the RCA cords are
used.
(If you use the 1 BIT input terminal, refer to
the operation manual for the super audio CD
player
.)
These terminals send signals of the external
equipment connected to the RCA (of the
SACD), LINE 1 or LINE 2 terminal.
12
4
3
LINE 1
LINE 2
SACD
LINE OUT
(COAXIAL)
DIGITAL 1
DIGITAL 2
DIGITAL OUT
(OPTICAL)
(OPTICAL)
RIGHT
+
-
LEFT
+
-
RATED IMPEDANCE : 8   
SPEAKERS
2
SM-SX1H
– 4 –
OPERA
TION MANUAL
7
Digital Output T
erminal (OPTICAL)
Connect equipment using a square type
optical digital cable.
(OPTICAL)
78
9
LINE 1
LINE 2
SACD
LINE OUT
(COAXIAL)
DIGITAL 1
DIGITAL 2
DIGITAL OUT
(OPTICAL)
(OPTICAL)
RIGHT
+
-
RATED IMPEDANCE : 8   
SPEAKERS
LEFT
+
-
6
5
5
Digital 1 Input T
erminal 
(COAXIAL) *
Connect equipment using RCA coaxial
cable.
6
Digital 2 Input T
erminal
 (OPTICAL) *
Connect equipment using the  square type
optical digital cable.
This terminal send signals of the external
equipment connected to the DIGIT
AL
 1 or 2
terminal.
*
For digital input to this product, use
equipment which adapts to the digital
audio interface.
(32kHz, 44.1kHz, 48kHz)
8
 Speaker Output T
erminals
Plug the speaker cord in firmly and be care-
ful that the end of the cord does not touch
the next terminal or speaker cord, as this
could cause damage to the amplifier
.
Use a speaker system which has 50 W or
more rated power input and 8 ohms im-
pedance.
If
 the volume is turned up too high with the
speakers of less than 8 ohms impedance con-
nected, the protection circuit of the amplifier
activates. Nothing is heard temporarily
.
9
 AC Input Jack
Connect the power cord to the 
AC INPUT
jack.
Speaker cord
Speakers
7th-order        
(delta-sigma) 
modulator 
1-bit coding LSI
Fixed-voltage 
high-speed 
switching circuit
Low-pass
filter network
1-bit
control signals 
Power  amplifier switching
signal
Out- put
Fixed voltage
Analog signal
Multi-bit 
digital signal
(32kHz, 44.1kHz, 48kHz)
1-bit signal
Over-
sampling
Direct input
(delta-sigma) dynamic feedback
This product uses 1-bit signals as control signals. 
As a result, amplification which maintains a
1-bit signal performance is realized by switching the fixed-voltage power with precise quartz-
crystal accuracy
.
Adopting the concept of “
 (delta-sigma) Dynamic Feedback”, this product enables stable am-
plification faithful to the original sound by sending back the power voltage fluctuations (which
af
fects the audio signal) to the “7th-order 
 (delta-sigma) modulator 1-bit coding LSI” which
corrects the 1-bit control signal in real time.
Sampling the input signal at a high-frequency approx. 2.8 MHz (64 fs), the 
 (delta-sigma)
modulation circuit yields a 1-bit signal stream which faithfully reproduces the original sound.
In this 7th-order 
 (delta-sigma) modulation block, the quantization noise is shifted to a
higher band to generate 1-bit signals which secure high signal to noise ratio in the playback
band.
Using these 1-bit signals as control signals, the fixed-voltage high-speed switching circuit is con-
trolled. 
The signals abstracted from the switching circuit are sent to the low-pass filter network and
used to drive speakers.
This amplifier has no analog amplifier elements and can obtain speaker driving power by “creating
1-bit control signals through high-speed sampling” and “synchronized high-speed switching to the
sampling frequency”. In consequence, amplification with excellent movement and transient char-
acteristics is fulfilled.
1-bit amplification process
Page of 56
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Sharp SM-SX1 (serv.man2) Service Manual ▷ Download

  • DOWNLOAD Sharp SM-SX1 (serv.man2) Service Manual ↓ Size: 3.11 MB | Pages: 56 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp SM-SX1 (serv.man2) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp SM-SX1 (serv.man2) System. Information contained in Sharp SM-SX1 (serv.man2) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.