Pioneer PDP-502MX Service Manual page 39

Waveforms of U-COM ASSY
1 IC3602-pin4
(Clock input: X3602)
V : 1V/div H : 1msec/div
1
2
IC3602-pin19
(Key code output)
V :2V/div H : 100msec/div
IC3602-pin19 (enlarged)
(Key code output)
V :2V/div H : 10msec/div
2
3
IC3604-pin2 (SCL)
V :5V/div H : 50msec/div
4
IC3604-pin3 (SDA)
V :5V/div H : 50msec/div
3
4
5
IC3604-pin7 (CLK2)
V :2V/div H : 50msec/div
IC3604-pin7 (CLK2)(enlarged)
V :2V/div H : 20msec/div
6
IC3604-pin8 (DATA2)
V :2V/div H : 50msec/div
IC3604-pin8 (CLK2)(enlarged)
V :2V/div H : 20msec/div
5
6
5
6
8
IC3604-pin45 ((E)SCL)
V :2V/div H : 200msec/div
IC3604-pin45 ((E)SCL)(enlarged)
V :2V/div H : 50msec/div
9
IC3604-pin46 ((E)SDA)
V :2V/div H : 200msec/div
IC3604-pin46 ((E)SDA)(enlarged)
V :2V/div H : 50msec/div
8
–GND
9
8
–GND
9
10
IC3604-pin23 (KEY)
V :2V/div H : 100msec/div
IC3604-pin23 (KEY)(enlarged)
V :2V/div H : 10msec/div
-
PDP-502MX, PDP-502MXE
11
IC3604-pin28
(Clock input: X3601)
V :2V/div H : 50nsec/div
–GND
-
–GND
–GND
–GND
10MHz
13
IC3612-pin10 (D_CLK)
V :2V/div H : 100msec/div
IC3612-pin10 (D_CLK)(enlarged)
V :2V/div H : 20msec/div
13
IC3612-pin13 (D_DATA)
V :2V/div H : 100msec/div
IC3612-pin13 (D_DATA)(enlarged)
V :2V/div H : 20msec/div
=
–GND
~
–GND
=
–GND
~
–GND
–GND
–GND
–GND
–GND
–GND
–GND
39