PDP-425CMX
163
5
6
7
8
5
6
7
8
C
D
F
A
B
E
7.1.8 POWER ON SEQUENCE
Descriptions on operation
1
When the main power switch on the main unit is set to ON, M+7 V is supplied from the POWER SUPPLY Assy to the main
microcomputer to boot it.
2
A request to turn on the power is issued from a key on the main unit or remote control unit.
3
The STB_MUTE signal (STB+3.3 V, ON/OFF control) is output from the main microcomputer to the power supply.
4
STB+3.3 V is supplied from the power supply to the MD microcomputer to boot it.
5
The MD microcomputer issues the REQ_MD signal to the main microcomputer. (QS2 data read request)
6
After confirming the QS2 data read request (confirming SD or PD), the main microcomputer issues PON.
7
The MD microcomputer sends a PON echo back to the main microcomputer.
8
The MD microcomputer issues the RELAY signal to turn on the unit.
REMI
M+3.3V
KEY ASSY
MAIN ASSY
Front key
LED2 ASSY
COMM SLOT
IF ASSY
COMM SLOT
ASSY
DIGITAL ASSY
POWER SUPPLY
ASSY
Remote-control
sensor
U2401
BUFF
IC8503
Main UCOM
IC9501
MD UCOM
IC3151
Power supply
UCOM
IC3151
BUFF
Q8503,Q8504
REG
M+7V
→
M+3.3V
6
7
5
3
KEY
STB+3.3V
TXD
2
2
M+3.3V
M+3.3V
M+3.3V
RXD
REQ_MD
STB_MUTE
M+7.0V
RELAY
4
8
1
Summary of Contents for PDP-42MXE10
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Page 132: ...PDP 425CMX 132 1 2 3 4 1 2 3 4 C D F A B E MAIN PWB CONNECTOR WAVE FORM POINT SIDE B ...