Power On Sequence - Pioneer PDP-5020FD Service Manual

1
A

[2] POWER ON SEQUENCE

REM
infrared
receiver
B
Inv. Amp
Q8751
REM
C
Inv. Amp
Q4211
Inv. Amp
Q6812
SR_OUT
D
SR OUT Jack
JA7871
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
44
1
2
Side Keys
KEY_1
KEY_2
1
SR_IN
IF
Microcomputer
1
IC6811
PDP-5020FD
2
3
MOD
Microcomputer OR
IC3601
TXD_MD
RXD_MD
REQ_MD
3
MAIN
2
Microcomputer
IC7003
TXD_IF
RXD_IF
CE_IF
REQ_IF
BUSY_IF
3
4
Power MOD
4
RELAY Control
RELAY2
4