Sharp DX-670X User manual

SHARP SERVICE MANUAL
l-l COMPACT
@.BE
DIGITAL AUDIO
S98C8DX670XBK
DX=670X(BK)
In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used,
(-INDEX TO CONTENTS
Page
SPECIFICATIONS
.........................................................................................
2
VOLTAGE SELECTION
................................................................................... 2
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
.......................................
2
NAMES
OF PARTS .......................................................................................
3
CAUTIONS ON HANDLING THE UNIT
.............................................................
3
DISASSEMBLY
.......................................................................................... 4, 5
REPLACEMENT OF
PICKUP
...........................................................................
5
FITTING OF CD MECHANISM
....................................................................... 6
FITTING
OF DISC HOLDER
........................................................................... 6
BLOCK
DIAGRAM
........................................................................................
7
FUNCTION TABLE OF
IC
........................................................................... 8, 9
ADJUSTMENT
......................................................................................
10, 11
EQUIVALENT CIRCUIT (BLOCK DIAGRAM) OF IC ...................................... 12, 13
TYPES OF TRANSISTOR AND LED
...............................................................
13
NOTES ON
SCHEMATIC
DIAGRAM
...............................................................
14
SCHEMATIC DIAGRAM/WIRING SIDE OF F’.W.BOARD ................................ 15-18
EXPLODED
VIEW .................................................................................
19, 20
REPLACEMENT PARTS LIST .................................................................. 21 -24
SHARP CORPORATION

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT,
PLEASE REFER TO THE OPERATION MANUAL.
SPECIFICATIONS
Type:
2channel stereo compact disc player
Signal readout: Non-contact;
semiconductor laser
Rotational speed: Approx.
200 - 500 rpm CLV
Error correction:
CIRC (Cross interleave Reed-Solomon
Code)
Audio channels: 2
Decoder: 16-bit linear
quantization
DIA convertor: 16.bit linear
Filter: 16.bit digital and active filter
Frequency response: 5 Hz - 20 kHz
Dynamic range:
90 dB (1 kHz)
Wow & flutter: Unmeasurable
outputs: Socket type; RCA Socket
Max. output level; 2.0 V
Recommended impedance; 10 kohms
Power source:
AC 110/12712201240\1, 50160 Hz
Power consumption: 10 W
Dimensions: Width;
430 mm (17”)
Height; 80 mm (3-118”)
Depth; 232 mm (9-l/8”)
Weight: 2.8 kg (6.2 Ibs.)
Specifications for this model are subject to change
without prior notice.
VOLTAGE SELECTION
The voltage selector is located on the rear of the unit. If ad-
justment is necessary, use a screwdriver in order to turn the
selector in either direction until the correct voltage figure is
displayed in the window next to the adjustment screw.
@
240
RATED LINE VOLTAGE
Figure 2 - 1
AC Supply Cord
QACCVOOOl AGZZ
QACCZ0063AFOO QACCL0052AFZZ
Figure
AC Plug Adaptor
QPLGA0253AFZZ
1 QPLGA0250AFZZ {
Figure
Figure 2 - 2 AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
-2-

NAMES OF PARTS
1.
Power Switch
2. Disc Table
3. Open/Close Button
4. Repeat Button: c
5. Call Button
6. Memory Button
7. Stop/Clear Button
8. Track DowniReuiewlAPSS Button
9. Track uplCuelAPSS Button
10. Pause Button: ii
11. Play Button: )
12. Play Indicator: b
13. Track Number Indicator
14. Programme Indicator: P
15. Minutes and Seconds indicators
16. Memory Indicator: M
17. Pause Indicator: II
18. Repeat Indicator: c
Figure 3- 1
12 13 14 15 16
II
17
18
Figure 3-2
CAUTIONS ON HANDLING THE UNIT
l Dew condensation
You know such phenomenon that, in winter, a windowpane
of the heated room develops some amount of dews on its
surface. This phenomenon of dew condensation may also
occur at the object lens in the pickup unit in the following
instances.
l When the compact disc player is operated immediately after
you have turned on a heating device in your room.
l When It is operated in a room full of wet air (with steam or
moisture).
l When it is operated in a warm place to which it has been
moved from a rather cold place.
If the object lens has some amount of dew condensed on it,
the compact disc player may fail to operate correctly as it
can’t read out the information data recorded on the disc sur-
face. If such occurs, remove the compact disc from the disc
table, turn on the power switch and leave the unit for some
time (about 1 hour at the longest); then it will resume its nor-
mal operation.
-3-

DISASSEMBLY
Caution on Disassembly
Follow the below-mentioned notes when disassembling the
unit and reassembling it, to keep its safety and excellent
performance:
1. Take compact disc out of the unit.
2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.
3. Take off nylon bands or wire holders where they need be
removed when disassembling the unit. After servicing the
unit, be sure to rearrange to where they were before
disassembling.
4.Take sufficient care on static electricity of integrated
circuits and circuits when servicing.
STEP REMOVAL
PROCEDURE FIGURE
1
Cabinet 1. Screw . . . . . . . . . (Al
x 3 4-l
2
Front Panel 1. Screw
.__...,,...._.,... (6) x 6
4-2
2. Socket ................
(Cl x 3
3 1 Loading Mechanism
/ 1. Screw .................
(D) x 2 / 4-3
2. Socket . . . . . . . . .
(El x 3
/
4
Servo PWB 1. Screw . . . . . . . . . .
fF) x 3 4-3
2. Socket .._.......... (G) x 1
5 Disc Holder 1. Push the Rack Gear 4-4
’
2. Hook.. .................
(H) x 2
6 CD Mechanism 1. Screw.. ................. (I)
x 2 5-l
2. Shift Lever.. ......
. ... (J) x 1
3. Cushion.. .............
(K) x 2
7
Display PWB 1. Screw.. ................
(L) x 2
2. Hook.. ................
(M) x 4
I 5-2 I
or 04xlOmm
Block
Figure 4- 1
(EIXI
h 03xEmm or
Figure 4- 2
(FIxI
03xBmm or
mm
0 3x IOmm
3
(Hlxl
&xl
03xBmm
Block
b (DIx2
03xlOmm
Figure 4- 3
Disc Holder
Figure 4 - 4
-4-

(1)x I m (KIxl
\ (K)xl
(J)x I
-
-Y’ II II/ I
Mechanism
Mechanism
(M)x4
Front Panel
/
Display P W B
Figure 5 - 1
REPLACEMENT OF PICKUP
When replacing the pickup, refer to “Cares when Handling
Pickup Assembly”.
(a) After removing the CD mechanism according to the
disassembling procedure, remove the screws and connec-
tors in order of 1, 2 and 3, and replace the pickup.
(b) Fit a new pickup in reverse order of disassembling.
(c) Connect the connector and lead wire as it was.
fdl The laser power adjustment is not necessary owing to
improvement of performance of pickup.
Note: When replacing the pickup do not apply force to the
turntable of spin motor. Otherwise, the height of main
chassis and turntable may be varied.
After replacing the pickup
This new mechanism has been newly designed to enhance
remarkably its performance as compared to the former ones,
so that there is no need to adjust pickup posture.
* After mounting the pickup, apply voltage to the slide motor
(M21, and ascertain that it runs at DC 1.5V or less.
\
(L)xZ
0 3x8mm
Figure 5 - 2
Motor
(M2)
\
Figure 5- 3
Figure 5 - 4
-5-

FITTING OF CD MECHANISM
1. Remove cushion from CD mechanism and fit it to loading
chassis.
2. Fit CD mechanism with cushion and insert shift lever.
3. Fix shift lever to loading chassis using screws.
Figure 6-l
FITTING OF DISC HOLDER
1. Turn the rack gear in the arrow direction A.
(This causes the disc lever to move to the direction 6.)
2. While keeping the rack gear in the direction A, force-fit
the disc holder to the chassis.
3. Turning the rack gear in the arrow direction C lowers the
disk holder, so that the disc holder is fixed.
Figure 6 - 2
-6-

Figure 7 BLOCK DIAGRAM
-7-

FUNCTION TABLE OF IC
RH-iX1619AFZZ VHiLC7880M/-1
Input/output Pin No. lTerminal Name 1
Terminal Nam
Function
Input/output
Outout Not used
Key strobe signal
Data is inputted
according to SCK
clock input when the
pin 96 of ICl is in
Data is outputted when
signal necessary for
Input
Not used
I
5 PO3/S I Input Power terminal +5
V
Input Word clock 2 input
terminal: internal
signal to latch digital
audio data (CHl data)
is generated by using
fall of WCLK2 when
IF is in low level.
?---
1 PO2/SO
t
output
Input LR clock 2 input
!
terminal: CHl and
e
/ *,
CH2 of input digital
audio data are
indicated.
data transfer is
outoutted.
7
/ WCLKl input Word clock 1 input
terminal: internal
signal to latch the
digital audio data (CH2
data) is generated by
using fall of WCLKI
when IF is in low level.
Digital audio data
I
input terminal
I
Remote control
Tray motor.
Open tray swnch
Ground
output
Not used
-
Bit clock terminal //
Power terminal, +5 V j
Output terminal for
test: usuallv open
/
I
output
lnrxt Input terminal for
test: usually used for
grounding
interface switching i
terminal
I
18 i P41 Input Ground
Reference voltage
Not usad
19 P40 Input
I
1 vss 22 --
-tlnput-- ~-
-
23-25
i VLC~-VLC~ / -
Input
Output
I
26
I
I
I VDD.~
27
’ -
28-30 COMZ-COMO
t
output
55
/ lNT1 / Input
LCD segment srgnal
output terminal
Data transfer
I
request input
For clock generation:
capacitor connecting
terminal
56 j RESET~lnput-^-
57 / CL1 -
58 VDD
L. ~____.
59
CL2
I I
6662
63
64
P13-Pll Input
PlO/INTO Input
P33 output
Key strobe signal
Ground
Not used
-8-

VHiLR37632/-1
Pin No. 1 Terminal Narna 1 Inout/outnut 1
FWWtian
1
2
3
4
5
6
7
El - 15
16
17, 18,19
20
21
22 - 29
30
31.32
33
34
35
36
37
38
39
40
41
42
43
44-59
60 - 62
63
64
65
66
67,68
69
70
71.72
73
74
75
76
77
78
79
80
81.82
83
84,85
86,87
88
89
90
91.92
93
94
95
96
97
98
99
100
LOIN
FCON
MUTE
SBCL
SCREQ
SDATA
SSYN
AQ- A7
VDD
-
A8, A9, WE
DE
Al0
D8 - Dl
DEPH
XIN, XOUT
$
SD0
SDSY
882K
SWL
SWR
GND
LROR
f/N
;)c/O0
DA1 - DA16
TIN1
- TIN3
@S
DFCL
CRCC
VDD
TEST1 - 2
CIFL
DFL
Cl F, C2F
FCS
FZC
FRF
HF
TER
TROF
TRGL
TRHD
KP+, KP-
FEOF
FEM+, -
MCON+, -
FD
PD
GND
vco, vco
EFMO
EFMN
EFMI
WQ
R/w
DOUT
DIN
~
SCK
. --~
output
Output
output
Input
output
output
output
output
-
output
output
output
output
output
-
-
-
output
output
output
output
-
output
Input
output
output
-
output
output
output
-
-
-
output
output
Input
Input
Input
Input
output
output
output
output
output
output
output
output
output
-
Input
output
Input/Output
Input
output
Input
output
Input
Input
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Address signal, data signal and input control signal
Power terminal
Address signal, data signal and input control signal
Address signal, data signal and input control signal
Address signal, data signal and input control signal
Address signal, data signal and input control signal
Deemphasis control signal
Crystal oscillation terminal
Synchronizing signal output
Not used
Synchronizing signal output
Not used
Synchronizing signal output
Not used
Not used
Ground
Synchronizing signal output
Digital filtering ON/OFF switching input
Setting of data format of 16-bit music signal
Not used
Test terminal
System clock standard output
Not used
Not used
Power terminal
Test terminal
Test terminal
Test terminal
Error state output
Focus servo initial writing signal
Focus point indicating signal
Disc reflected signal
HF envelope signal
Tracking error signal
Tracking servo operating area switching signal
Tracking servo gain switching signal
Tracking error signal level hold signal
Kick pulse signal to move pickup
Tracking error signal stop
Field pulse signal to move pickup
Spin servo control signal
VCO clock error output
Phase comparator output
Ground
Clock oscillation
Auto-level slice
Auto-level slice
Autolevel slice
Qcode output
0 code input
Q code output
Command data input
Clock input
-9-

ADJUSTMENT
As for preparation for adjustment, adjusting method
and replacement of pickup refer to the relevant ex-
planation in Service Manual “ADJUSTMENT PRO-
CEDURES OF AUDIO PRODUCTS”.
1. Preparation for Adjustment
When adjusting, be sure to refer to Service Manual “AD-
JUSTMENT PROCEDURES OF AUDIO PRODUCTS”.
. Test mode of control microcomputer
Depressing the REPEAT button and CALL button, turn on
the power switch.
2. VCO Free-Run Frequency
Adjusting
Point
Specified value Instrument Connection
Ll
4,300 kHzt 15 kHz
Pin 63 and Pin 40 (GND)
of ICl
3. Servo Unit
The procedure of adjustment differs from that stated in
Service Manual “ADJUSTMENT PROCEDURES OF AUDIO
PRODUCTS”.
Follow the procedure stated below.
. Focus Offset
Adjusting
Point
Specified value Instrument Connection
VR3 0
2 5omv
Pin 2 and pin 1 [GNDI of
CNPZ
. Tracking Offset
Adjusting
Point
Specified value Instrument Connection
VR2 0
Ifr 50 mV
Pin 4 and pin 1 (GND) of
CNP2
!
I
/
I
= Xacking Error Balance
Adjusting
Point
Adjusting method Instrument Connection
III
I
VR4
‘1
Pin 2 and pin 25 (GND)
of IC2
I
I
I - .--
I
“I: Shot-t-circuit the pin 6 of IC8 to the earth.
Adjust so as to obtain symmetric waveform (Fig. 10-2)
when DC is OV.
. Focus Gain
Adjusting Adjusting method Instrument Connection
Point
VRI
Set the same waveform Both ends of R46
for CHl and CH2 (CHI, CH2) and pin 25
l 2
(GND) of IC2.
“2: Apply sine wave (Oscillation frequency 1.0 kHz, l.OVrms)
as shown in Figure 10-3.
TRACKING ERROR
BALANCE ADJ. J IG
Figure IO - 1
Figure 10 - 2
I I
. --.,
I
1
SIGNAL
GENERA
I 1
LA,
I
I .
7
I
3. 3K
I
----------e---------J
FOUCUS GAIN ADJ. JIG
Figure 1 O-3
- 10 -