Tray Motor Drive - Sony DVP S530D Training Manual

Tray Motor Drive

The opening and closing of the disc tray involves two micro controllers,
one gate array IC and a driver IC that powers the loading motor. The
loading motor is powered by pressing the front panel open/close tray but-
ton S212. The following occurs when the tray button is pressed:
1. Interface Controller IC201 recognizes the tray button
2. IC201 turns on the display to show the command entered
3. IC201 communicates with System Control IC202
4. IC202 instructs Hybrid gate array IC601 to issue a drive command
5. Driver IC802 translates the command into loading motor current
6. The tray position switch returns information to IC201 (via IC601)
The tray position switch information is sent to Interface IC201 via IC202 to
complete the tray open cycle. The "OPEN" display disappears when the
cycle is complete. This also sets the latch, permitting the tray to be closed
the next time the tray button is pressed.
Interface Controller IC201 Recognizes the Tray Button
Pressing the tray button S212 reduces the voltage at IC201/pin 5 from
+5V to +0.65V.
IC201 Turns On the Display
Once the command is recognized by Interface Control IC201, the ND201
fluorescent display digits and segments lines are multiplexed with a LOW
to illuminate the word OPEN.
IC201 Communicates with System Control IC202
At almost the same time the display is lit, serial communications occurs
with System Controls IC202.
present as long as the DVD player is on, but an additional group of data is
output when the S212 tray button is pressed. Serial communications in
this DVD player occur in the following sequence:
1. IC201 starts it with a single low (almost undetectable) interrupt pulse
from IC201/pin 78 (ch 1). Resistors R036 and R037 reduce the signal
for IC601. The input voltage should never exceed the IC's supply
voltage.
The serial communications are always
37
2. IC601 sends this information along the parallel bus to IC202. This
occurs when IC601/pin 142 is periodically (chip) selected using CS1
or CS4 to send and receive data. Two chip select lines are used in
different parts of the Hybrid Gate Array IC601.
3. When IC202 is ready, it outputs a low chip select signal (ch 4) from pin
97 to Interface IC201/pin 76. IC203, in-between IC201 and IC202,
translates the signal to a 5-volt level for IC201.
4. IC202 simultaneously sends serial clock from pin 78 to IC201/pin 70
(ch 3) during the chip select interval.
5. Data is transmitted from IC201/pin 71 to IC202/pin 76 (ch 2).
As seen below, the group of waveforms on the left in "tray 1" are of the
serial communications between IC201 and IC202 when the DVD player is
on. It consists of a low going interrupt pulse used for triggering at channel
1. This is better seen in the tray 2 waveform group taken at an expanded
time base. Shortly after interrupt (ch 1), clock (ch 3) and a chip select (ch
4) pulse appear. Then data (ch 2) is transmitted to IC202.
PM3394, FLUKE & PHILIPS
ch1
T
1
ch2
ch3
ch4
2
=A G
3
CH1!5.00 V=
CH2!5.00 V=
4
CH3!5.00 V=
CH4!5.00 V= CHP MTB10.0ms- 0.72dv ch1-
Waveform = tray 1
Waveforms Tray 1 and 2 = DVD Player Powered ON
Name
Channel 1 XIFint(interrupt)
Channel 2 Serial data (to IC202)
Channel 3 Serial clock (SCO)
Channel 4 Chip select (CSOL)
Time base Tray 1 = 10msec/div. Tray 2 = 0.2msec/div
PM3394, FLUKE & PHILIPS
ch1
T
1
ch2
ch3
ch4
2
3
CH1!5.00 V=
CH2!5.00 V=
4
CH3!5.00 V=
CH4!5.00 V= CHP MTB 200us- 0.72dv ch1-
Waveform = tray 2
Location Voltage/div
CN006/pin 2 5Vp-p
CN006/pin 4 5Vp-p
CN006/pin 6 5Vp-p
CN006/pin 3 5Vp-p