Power On Sequence - Pioneer PDP-4280HD Service Manual

1

5.1.2 POWER ON SEQUENCE

A
REM
infrared
receiver
B
Inv. Amp
Q9731
REM
C
Inv. Amp
Q4105
Inv. Amp
Q8302
SR_OUT
SR OUT Jack
JA9404
D
1 : The remote control (or KEY) signal is input to the IF microcomputer.
2 : The IF microcomputer sends the operation data of the remote control unit (or KEY) to the main microcomputer.
3 : The main microcomputer issues a startup command (PON) to the MOD microcomputer.
4 : The relay is controlled with logical OR interpretation of control signals by the main microcomputer and
module (MOD) microcomputer.
E
F
42
1
2
Side Keys
KEY_1
KEY_2
1
SR_IN
IF
Microcomputer
1
IC8301
PDP-4280HD
2
3
MOD
Microcomputer
IC3151
TXD_MD
RXD_MD
REQ_MD
3
MAIN
2
Microcomputer
IC8401
TXD_IF
RXD_IF
CE_IF
REQ_IF
BUSY_IF
3
4
Power MOD
4
RELAY Control
4