Power On; Ac Power Only; Communications Ic501 - Ic701 - Sony CDP-CX235 Training Manual

Power On

Once the CD Changer is plugged into AC, pressing the front panel Power
button permits Syscon to enable regulator IC506. IC506 outputs D+5V,
+7V, and a reset signal to power the remaining devices on the BD board
and turn on 2 LEDs to illuminate the disc door compartment.

AC Power Only

When the CD changer was plugged into AC, Syscon IC501 received power
at pin 37 and was fully functional as marked by the X501 activity at pins
31 and 32. There is even data and clock signals leaving IC501/pins 18,
19 and 58. These signals go to FL Display Driver IC701, but there is no
instruction to turn on the front panel display while the unit is still OFF.
P M 3 3 9 4 , F L U K E & P H I L I P S
ch1
ch2
1
ch3
T
2
3
C H 1 5 . 0 0 V =
IC501 Activity at Power OFF
Channel
1.
2.
3.
Time base = 50usec/div
Power ON
Syscon IC501 receives the power ON command from the front panel push
button at pin 44 (LOW). IC501 responds by outputting a HIGH at IC SW
Name CN501/pin
FL Data
FL CLK (Clock)
FL LT (Latch)
11
pin 65 to enable regulator IC506. IC506 has three outputs:
1. D+5V from pin 2 is used to:
•
Power the digital ICs on the DB board; and
•
Turn on the LED at the disc door compartment. This also lets the user
know the unit is ON.
2. +7V from pin 9 is used to:
•
Power the focus/sled/tracking driver IC102; and
•
Power the coils and motors on the BD board
3. XRST from pin 6 goes HIGH to:
•
Unmute the analog audio output lines; and
•
Enable Servo Control IC101 and the focus/sled/tracking driver IC102
on the BD board.
Communications IC501 – IC701
At power On, the communications activity increases between IC501 and
IC701. This is to provide constant update information to the display IC701.
1
2
4
,
c h 1
c h 2
1
c h 3
T
2
3
C H 1 5 . 0 0 V =
C H 2 ! 5 0 0 V =
IC501 Activity at Power ON
Channel
1. FL Data
2. FL CLK (Clock)
3. FL LT (Latch)
Time base = 50usec/div
Name CN501/pin
1
2
4