Sony CDP-CX235 Training Manual page 30

Sony cd changer training manual
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P M 3 3 9 4 , F L U K E & P H I L I P S
ch1
1
ch2
ch3
2
ch4
3
C H 1 5 . 0 0 V =
T
C H 2 ! 5 . 0 0 V =
4
C H 3 ! 5 . 0 0 V =
C H 4 ! 5 . 0 0 V = C H P M T B 1 0 . 0 m s
Reading the Tray Table Information
Channel
1.
CE (chip enable - low)
2.
1 of 14 Address lines
3.
WE (write enable - low)
4.
1 of 8 Data lines
Time base = 10msec/div
Note that the Read/Write channel 3 waveform remains HIGH, indicating
that only the memory reading operation takes place. Label and disc
availability data outputs as each tray table slot was addressed. In this
CD Changer example, there were no labels stored in memory so very
little data is present at channel 4.
Display Information
When the door is closed and the rotary encoder is turned, the memory is
checked for the next occupied slot location. As the tray moves the disc
toward the CD Mechanism, the label information is output. At each tray
slot location where there is a disc, the corresponding Label information
is sent to Syscon IC501. IC501 reorganizes the data and sends the
applicable information to the FL Display Driver IC701. If there was no
label information, only the disc number is sent. The Display IC assigns
c h 4 -
Name
IC502/pin
20
4
27
15
25
segments to display this information on the front panel display tube.
The following waveforms show the data, clock and latch signals from IC501
to IC701 used to produce a display when powered on.
,
c h 1
c h 2
1
c h 3
2
T
3
C H 1 5 . 0 0 V =
IC501- IC701 Communications (Power ON)
Channel
1.
2.
3.
Time base = 200msec/div
Oddly, even when the CD Changer is turned OFF, Syscon is sending
data, clock and latch signals into FL Driver IC701.
P M 3 3 9 4 , F L U K E & P H I L I P S
ch1
ch2
1
ch3
2
T
3
C H 1 5 0 0 V =
IC501- IC701 Communications (Power OFF)
Name
IC501/pin
Data
1
Clock
2
Latch
4

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