Sony dvp-s530d 사용자 설명서
47
P M 3 3 9 4 , F L U K E & P H I L I P S
c h 4
c h 3
c h 2
c h 1
C H 1 ! 2 . 0 0 V =
C H 2 ! 5 . 0 0 V =
C H 3 ! 2 . 0 0 V =
C H 4 ! 2 . 0 0 V = C H P M T B 1 . 0 0 m s - 0 . 3 0 d v c h 1 +
1
2
3
4
T
P M 3 3 9 4 , F L U K E & P H I L I P S
c h 4
c h 3
c h 2
c h 1
C H 1 ! 2 . 0 0 V =
C H 2 ! 5 . 0 0 V =
C H 3 ! 2 . 0 0 V =
C H 4 ! 2 . 0 0 V = C H P M T B 5 0 . 0 u s - 1 . 5 8 d v c h 1 +
1
2
3
4
T
Waveform Comm 1
Waveform Comm 2
Laser Servo
After the disc tray is closed (disc chucked/platform up), the laser is turned
on. The laser on command takes this six-step path from IC202:
on. The laser on command takes this six-step path from IC202:
System Control IC202 and HGA IC601 Communications
After System Control receives the platform up verification (S002 in the
Tray Motor Drive diagram), it gives the command to move the sled to the
home position, then outward. The laser is timed by IC202 to turn on
about the time the sled has already moved away from home position and
is resting under the disc.
Tray Motor Drive diagram), it gives the command to move the sled to the
home position, then outward. The laser is timed by IC202 to turn on
about the time the sled has already moved away from home position and
is resting under the disc.
HGA IC601 to Servo DSP IC701 Communications
The laser turn on instruction is sent from IC601 to DSP IC701 using the
parallel bus. Since the bus is used by other ICs as well, communication is
valid between these ICs when the CS chip select at IC701/pin 3 is low.
parallel bus. Since the bus is used by other ICs as well, communication is
valid between these ICs when the CS chip select at IC701/pin 3 is low.
Servo DSP IC701 to RF Amplifier IC001 Communications
The laser turn on command uses three of the four communications lines
that interconnect IC701 and IC001:
that interconnect IC701 and IC001:
The following waveforms show the communications between the two ICs
when PB is pressed. Waveform group “Comm 2” was taken at an ex-
panded time base. They show that SSCK (ch4) is actually the data line
and not the clock. The SSCS (ch 1) marks the 2-byte group of data by
when PB is pressed. Waveform group “Comm 2” was taken at an ex-
panded time base. They show that SSCK (ch4) is actually the data line
and not the clock. The SSCS (ch 1) marks the 2-byte group of data by
remaining high for 16 bits. SSWD (ch 3) is the clock signal, and not a
write command. These waveforms are only present at disc PB start and
stop.
write command. These waveforms are only present at disc PB start and
stop.
Laser Life
There are three ways to predict laser life:
q
Laser current – Measures the voltage across R005 at Q001/emitter.
New laser = 0.733V. Bad laser will read over 1 volt.
New laser = 0.733V. Bad laser will read over 1 volt.
q
Laser operating hours – From the test mode adds the CD and DVD
hours. This accumulative information is stored in IC201 EEProm.
hours. This accumulative information is stored in IC201 EEProm.
q
Laser light – 0.18mW was measured using the wrong (freq) laser power
meter (Leader model 8001). 0.35mW of power is the correct power
level using the model 8000 (HeNe position).
meter (Leader model 8001). 0.35mW of power is the correct power
level using the model 8000 (HeNe position).
DVD/CD Laser Module
The laser turns on when the voltage from CN001/pin 2 = 2 volts. Within
the laser module is a light receiving diode that monitors the laser light
intensity. This voltage is fed back to IC001/pin 19 for regulation. The
voltage is the same for CD and DVD SL PB.
the laser module is a light receiving diode that monitors the laser light
intensity. This voltage is fed back to IC001/pin 19 for regulation. The
voltage is the same for CD and DVD SL PB.
1. System control IC202
2. HGA IC601
3. Servo DSP IC701
4. DVD/CD RF Amplifier IC00
5. Q101
6. DVD/CD
Laser
Module
IC701 – IC001 Communications
Label
Location
Description
1. SSCS
CN002/pin 5
High for 16 bits of data (load)
2. SSRD
CN002/pin 6
Not used
3. SSWD
CN002/pin
7
Clock
4. SSCK
CN002/pin
8
Data
Communications 1 and 2 when the Play button is Pressed
Name
Location
Voltage/div
Channel 1
SSCS
CN002/pin 5
3Vp-p
Channel 2
SSRD
CN002/pin 6
0Vp-p
Channel 3
SSWD
CN002/pin 7
3Vp-p
Channel 4
SSCK
CN002/pin 8
3Vp-p
Time base
Comm 1 = 1msec/div. ; Comm 2 = 50usec/div.