DOWNLOAD Sharp DV-660H (serv.man2) Service Manual ↓ Size: 1.96 MB | Pages: 51 in PDF or view online for FREE

Model
DV-660H (serv.man2)
Pages
51
Size
1.96 MB
Type
PDF
Document
Service Manual
Brand
Device
DVD / start to section 13-4
File
dv-660h-sm2.pdf
Date

Sharp DV-660H (serv.man2) Service Manual ▷ View online

DV-660S
DV-660H
8. Replacing the Sled Motor
(1) At the rear side of chassis remove the two M1.7 screws  A  , and remove the motor angle  B  .
(2) Remove the thrust holding screw  C   (for easier removing wipe off the thread lock).
(3) Remove the two motor fitting screws M1.4  D  , and replace the motor  E  . Motor is replaced in the state while the worm  F  is
kept press-fitted to the output shaft.
Note: When installing the motor, take care so that the worm does not damage the ANG  B  hole.
(4) Screw in the thurust holding screw  C  , adjust the worm front end clearance to 0 to 0.1 mm, and apply screw lock.
5. Disassembling the loading drive system
(1) Remove the two M2 screws  A  .
(4)
Remove relay gear 2  E  .
(2) Remove the tray pinion  B  .
(5)
Remove the two M1.7 screws  F  .
(3) Remove the relay gear 1  C   together with the
(6)
Remove the L motor  G  (with pulley) downward.
timing belt S  D  .
M2
M1.7
L·Motor Pulley
L·Motor
Timing belt S
Relay
gear1
Relay
gear2
Tray pinion
A
B
E
C
D
G
F
6. Disassembling the mechanism chassis from the moving chassis
(2) Remove the insulator  B  (2 pcs. at the right side in diagram) parallel in the arrow direction.
(At this time it is better to insert the fine head of screw driver at the ID side of insulator and to move in the arrow direction, which
facilitates removal.)
(3) Remove the mechanism chassis in the arrow direction, pulling upward aslant.
At this time take care so that the insulator  C  (left side, 2 pcs.) is not damaged. (Do not put at once the mechanism chassis
assembly.)
Insulator
Insulator
Insulator
Insulator
Mechanism chassis
C
B
B
C
7. Replacing the pickup and the spindle motor
Since the pickup optical axis and turntable inclination of DVD are adjusted with higher accuracy than of CD/MD, make a replacement
as a mechanism service chassis ass'y (refer to Parts List).
Thurust holding screw
Apply screw-lock.
M1.4 screw
M1.7 screw
Motor Angle
B
A
D
Worm F
Sled motor E
C
Mecha chassis Ass'y
6-3
DV-660S
DV-660H
7. EXPLANATION OF MECHANISM
(1) Tray loading mechanism
When the tray loading motor rotates counterclockwise, motion is transmitted to the slide rack  D  through the intermediate
gear 1  A  , intermediate gear 2   B   and tray pinion  C  , resulting in insignificant motion in the arrow direction.
The slide rack is linked with the operating chassis. It lowers the pickup mechanism.
The protrusion of slide rack   E   is linked with the tray through the groove at the rear side of tray, so that the tray is
pushed ahead a little. When the tray is pushed out, the slide rack is disconnected from the tray pinion, and at the same
time the gear at the rear side of tray is connected with the tray pinion, and the tray is pushed ahead.
When the tray is pushed out fully, the slide rack moves further in the arrow direction through the groove at the rear side
of tray. The tray position detection switch  F  is turned on, and the tray loading motor stops.
When the tray closes the operation is as follows. If the tray OPEN/CLOSE button or tray is pressed and the detection
switch is turned off, the tray loading motor rotates clockwise, so that the tray is retracted. When the detection switch
is turned on again, the tray loading motor stops.
Intermediate gear 2
Intermediate gear 1
Tray pinion
Pawl linked with the groove at the 
rear side of tray
This groove is linked with the pawl of 
pickup mechanism.
Tray position detection switch
Slide rack
F
D
E
B
C
A
Sled motor
Pickup
Sled pinion
Rack
Pickup
Position detection
switch
Spindle motor
E
C
B
A
D
(2) Pickup feed mechanism
When the sled motor  A  rotates, the rack  C  moves through the sled pinion  B  so that the pickup  D  is moved to the
internal or external periphery.
When it is moved to the innermost periphery, the position detection switch   E    is pushed by the rack, so that the position
of pickup is initialized.
(3) Disc rotation mechanism
The spindle motor is used to rotate.
IC701 is used to control.
When the spindle motor is replaced, replace the
spindle unit.
7-1
DV-660S
DV-660H
8-3. POLARITIES OF SIGNAL
8. OPERATION OF PICKUP
8-1. CIRCUIT CONFIGURATION OF PICKUP
The pickup unit reads signals from the disk, and the flexible cable is connected to the board. The following signals flow through the
cable.
8-2. EQUIVALENT CIRCUIT OF PICKUP
FO+
TR–
TR+
FO–
ACTUATOR
OSC
V
OS
LD
PD
VA
VB
VC
VD
Sga
V
raf
V
cc
GND

+

+

+

+
HOLOGRAM LASER UNIT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
TR–
FO+
TR+
FO–
VR
PD
V
CC
GND
LD
GND
V
OS
NC
NC
V
ref
(VCC/2)
VA
VC
Sga
GND
VB
VD
(NC)
Power adjust
HIGH-FREQUENCY CONVOLUTION
Focus
When electric current is flowed
FO+, FO-
from FO+ to FO-, the lens comes
 to near the disk.
Tracking
When electric current is flowed
TR+, TR-
from TR+ to TR-, the lens goes
toward the outer circumference.
Gain switching DVD one Layer
High gain
Sga
DVD two Layer
Sga : +5V
         CD
8-4. SIGNALS OF PICKUP
8-4-1. Tracking drive signal (TR+, TR-)
The signal drives the tracking servo mechanism which projects the beam on the track by moving the objective lens (OL) to the outer
or inner circumference (at a right angle against the track) of the disk.
8-4-2. Focus drive signal (FO+, FO-)
The signal drives the focus servo mechanism which aligns the focus on the pit of the disk
by elevating OL (vertically against the disk surface.)
The VR terminal is connected to GND.
2-focus objective lens
Actuator assembly
8-4-3. Monitor Diode (PD)
Since the laser diode largely varies output of the laser light even if the flowing current is slightly varied, the projection
light is detected with the monitor diode to control the laser light to be equally output.
Since the current varies on the monitor diode according to the intensity of the received light of the laser diode, the drive current of
the laser diode is reduced if the current of the monitor diode increases. On the contrary, the drive current of the laser diode is increased
if the current of the monitor diode decreases.
As the projection light of the laser diode becomes stronger, the current of the monitor diode increases to increase the current which
flows into the monitor diode output (PD).  This is input to the pin 44 of IC303 and is compared with the reference voltage to control
the drive current of the laser diode.
The circuit is called ALPC (Automatic Laser Power Control).
8-4-4. Laser diode drive current control (LD)
Power supply to drive the laser diode
8-4-5. High-frequency convolution module power supply (VOSC)
The high-frequency convolution imposes the high-frequency signal on the DC current to impose the high frequency on the drive
current of the laser. Thus, the interference of outgoing light and reflected light is prevented.
Monitor Diode
Basic Structure of Laser Diode
Laser Diode
8-4-6. HF Signal (VA, VB, VC, VD)
Signals recorded in the disk
LD
PD
When the quantity of laser light increases, the current shown in
figure increases and the PD terminal voltage rises.
IC303 is used to control. The LD terminal voltage lowers, and
the quantity of light reduces. (IC303 is actuated by voltage
input.)
8-1
DV-660S
DV-660H
9. TEST MODE
Memory Test Mode
Program version indicaiton.
Video Test Mode
Ordinary test pattern indication, and copy guard signal added test
pattern indication are given.
Mecha Test Mode
Servo system initialization, tray opening and closing, laser, servo,
continuous playback, jump test are performed.
Servo adjustment
Servo version indication, VC/FE/TE/RF AVRG, TRVSC, RF
value read mode
LEVEL, FO BIAS, FO GAIN, TR GAIN indication are given.
9-1. 
EXPLANATION OF OPERATION AT THE SYSTEM START
Test Mode Operation
SystemOpe( )
DVDOpe( )
Systest( )
DVD Disc detection
CD Disc
detection
No Disc and
Test 0 (F0h) key
Eject or
error
Eject or
error
Power
Off
Power
Off
Memory Test
Model number
Program version
Region code
microcode version
 
Dynamic
Test
Tray Open/Close
Sled Move
DVD Servo
CD Servo
Video Test
Initial Screen
Test Pattern
'1' Key
'2' Key
'3' Key
FlashOpe( )
Reset
Start
Flash rewriting key
Static Test
Test0
(F0h)
key
Branching with
ten keys
Test0
Key
Test0
Key
Test0
(F0h)
key
OSD 
Adjustment
value display
OSD 
Adjustment
value display
Initial resetting
CDOpe( )
Note: For test mode input,
"F0h" = PLAY + Stop
The keys of main body are doubly pressed.
Systest( )
(0xF100)
 
Dinamic
Test
Video
Test
'1' Key
'2' Key
'3' Key
Transition of test mode status 
(1)
Memory Test
Last Update display
ErrDisplay0  ErrDisplay1
10000000     ********
   (last update)
   (last update)
Play Key
System( )
Test0 Key
SystemMode
=
0xF100-0xF1FF
Memory Test
Model number
Program version
Region code
microcode version
Model Number display
   (Model Number)
Play Key
Region code display
   (Region code)
Play Key
Microcode version
display
  (Microcode. Ver)
Play Key
Program Version display
 (Program version)
Play Key
Servo version display
  (Servo. Ver)
Play Key
ErrDisplay0  ErrDisplay1
10000001     ********
ErrDisplay0  ErrDisplay1
10000002     ********
ErrDisplay0  ErrDisplay1
10000004     ********
ErrDisplay0  ErrDisplay1
10000005     ********
ErrDisplay0  ErrDisplay1
10000003     ********
9-1
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