SM-SX100 (serv.man2) - Sharp Audio Service Manual (repair manual)

– 1 –

• In the interests of user-safety the set should be restored to its

original condition and only parts identical to those specified be
used.

Page

IMPORTANT SERVICE NOTES (FOR U.K. ONLY) ........................................................................................................... 2
SPECIFICATIONS .............................................................................................................................................................  2
NAMES OF PARTS ...........................................................................................................................................................  3
OPERATION MANUAL ......................................................................................................................................................  5
DISASSEMBLY ..................................................................................................................................................................  6
ADJUSTMENT ...................................................................................................................................................................  9
INTRODUCTION OF CIRCUIT OUTLINE .......................................................................................................................  11
EXPLANATION OF 1-BIT UNIT .......................................................................................................................................  17
WIRING PROCESS DIAGRAM .......................................................................................................................................  20
NOTES ON SCHEMATIC DIAGRAM ..............................................................................................................................  23
TYPE OF TRANSISTOR AND DIODE .............................................................................................................................  23
BLOCK DIAGRAM ...........................................................................................................................................................  24
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD .............................................................................................  26
WAVEFORMS OF CD CIRCUIT ......................................................................................................................................  46
TROUBLESHOOTING .....................................................................................................................................................  47
FUNCTION TABLE OF IC ................................................................................................................................................  51
PARTS GUIDE/EXPLODED VIEW/PACKING METHOD (FOR U. K. ONLY)

– 2 –

Specifications for this model are subject to change without
prior notice.

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.

230 V, 50 Hz
230 V, 50 Hz
220 V, 50 Hz
110 - 120 V, 50/60 Hz
220- 240 V, 50/60 Hz

RMS; 100 W + 100 W (DIN 45 500)

0.02 % (1 kHz, 1 W)

5 Hz-20 kHz (+1dB, -1dB)
5 Hz-100 kHz (+1dB, -3dB)

105 dB (5 Hz-20 kHz)

7th-order 

 (delta-sigma) modulation

DIGITAL1; ST link optical
DIGITAL2; BNC coaxial
DIGITAL3; RCA coaxial
DIGITAL4; Square type optical
SACD; RCA analog, 1 BIT digital
LINE 1; RCA analog
             (350 mV rms / 50 k ohms)
LINE 2; XLR analog balanced

               (350 mV rms / 50 k ohms)

DIGITAL OUT; Square type optical
LINE OUT; RCA analog
SPEAKERS; 8 ohms/4 ohms selectable

Europe
Singapore
Hong Kong
Other countries

 70 W

70 W
72 W

70 W
70 W

POWER
CONSUMPTION

Width; 472 mm (18 - 5/8”)
Height; 89 mm (3 - 1/2”)
Depth; 462 mm (18 - 3/16”)

Approx. 18.5 kg (40.8 lbs.)

POWER SOURCE

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 buzzor sounds.

SHORT-CIRCUIT
AC POWER 
SUPPLY CORD

CONNECT THE PROBE
TO GND 

OF CHASSIS

SCREW

 PROBE

AC

UNIT

WITHSTANDING
VOLTAGE TESTER

+

-

OUT

– 3 –

T

urns the unit on or of

f.

Controls the sound level.

Displays the sound level within the range

of “0” - “128”.

Used to select the equipment source you

want to play back.

When the power is turned on, the unit is

switched to “SACD”.

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

.

Connect equipment using ST link optical

digital cable.

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 sig-

nal 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 equipment which

has a 1-bit signal output terminal.)

Connect equipment using RCA coaxial

cable.

Connect equipment using the  square type

optical digital cable.

Connect equipment using BNC coaxial

cable.

*

– 4 –

Connect equipment using a square type

optical digital cable.

Connect equipment using RCA cords.

Connect equipment using RCA cords.

Connect equipment using XLR cables.

2.COLD(–)

3.HOT(+)

1.GND

The balanced output terminal pins 2.COLD (-)

and 3.HOT (+) are reversed on some equipment,

such as a CD player

. If you connect such equip-

ment to this product using XLR cables, the sig-

nals are in antiphase. In this case, change the

pins 2 and 3 of one connector of the XLR cable

to match them to the equipment that you are

connecting. See diagram below

.

CD player etc.

This product

These terminals send signals of the exter-

nal equipment connected to the RCA (of

SACD), LINE 1 or LINE 2 terminals.

This terminal send signals of the external

equipment connected to the DIGIT

AL

 1, 2 ,

3 or 4 terminal.

1

2

3

1

2

3

GND

COLD

HOT

GND

COLD

HOT

Speaker output terminals of the RIGHT and

the LEFT channels are located above and

below each other in two rows for speaker

bi-wiring.

Since the upper and lower rows have com-

mon specifications, you can connect your

speakers to either row when using a conven-

tional speaker system. When connecting a bi-

wired compatible speaker system, the upper

row is used for the high frequency speaker

drivers, and the lower row is used for the low

frequency speaker drivers.

Connect the power cord to an 

AC INPUT

socket.

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

.

When connecting the speaker cord, wind it

firmly around the terminal as shown in the il-

lustration below

.

This amplifier is designed to operate with a

variety of speaker systems. Set the imped-

ance selector switch to the proper setting

depending on your speaker system’

s im-

pedance.

Switch to 4

 OHMS

 if the impedance of the

speaker system is 4

 - 6

 ohms, to 8

 OHMS

if it is 8

 ohms

 .

(4 - 6 ohms)

(8 ohms)

Be sure to turn the amplifier power of

f when

changing the impedance selector switch

position. Failure to turn the power off may

cause damage to your speakers.

Speaker cord

(High frequencies)

(Low frequencies)

Speaker cord