Pioneer PRO-141FD Service Manual page 45

5
[2] POWER ON SEQUENCE
MAIN ASSY
SW
3
PWR_CTL
_MD
MAIN
Microcomputer
IC7001
2
REM Infrared
SIDE
Receiver
KEY
U2101
KEY ASSY IR ASSY
1 : When the Main Power Switch of the main unit is set to ON, power of 3_3V_STB is supplied from the power supply
unit to the main microcomputer. The main microcomputer starts up.
2 : The power-on command is issued from the Power key on the main unit or remote control unit.
3 : The main microcomputer activates the PWR_CTL_MD signal.
4 : Power of 3_3V_ACT is supplied to the MD microcomputer. The MD microcomputer starts up.
5 : The MD microcomputer outputs the REQ_MD signal to the main microcomputer (QS2 Data Read command).
6 : After confirming the QS2 command (confirmation of SD/PD), the main microcomputer outputs the PON command.
7 : The MD microcomputer sends a PON echo back to the main microcomputer.
8 : The MD microcomputer outputs the RELAY signal to start supplying power.
5
6
3_3V_STB
1
DIGITAL ASSY
3_3V_ACT
4
TXD
6
RXD
Microcomputer
7
5
REQ_MD
2
6
7
MD
8
IC3601
RELAY
PRO-141FD
7
8
POWER SUPPLY
UNIT
Power Supply
Microcomputer
8
A
B
C
D
E
F
45