Power On Sequence - Pioneer XV-HTD1 Service Manual

XV-HTD1

7.1.4 POWER ON SEQUENCE

Reset start
• It starts when the XRESET terminal (Pin 11) is "H level".
Microcomputer
initialization
Model
discrimination
• The input of Pin 20 is inspected and the model discrimination is done.
Demonstration mode
permission
Yes
Demonstration mode
demonstration
mode?
Yes :Power ON
System power supply on
DVD microcomputer start-up
Relay release
Demonstration mode
or Normal power ON mode
* If the pulse is not input to the AC terminal (Pin 26) about 60ms, during the memory backup mode,
the microcomputer does not process all.
* It returns from the memory backup mode when there is a rising up input at the XRESET terminal (Pin 11).
78
Initialization routine
No
Main loop processing
No
• The POWER terminal (Pin 82) is "H".
• Only in DVD function, the DVD RESET terminal (Pin 87) is "H".
• The speaker relay is turned on after about four seconds from power on.
The RELAY ON/OFF terminal (Extended port of VOLIC) is "H".
• The system mute is released after about four seconds from power on.
The XLINEMUTE terminal (Pin 88) is "H".
* However, mute is not released in the following cases.
• When the main volume is 0.
• When The XDSP MUTE terminal (Pin 1) is error or no lock to the input signal on the DIGITAL
input mode.
Microcomputer IC (PDC076) (MAIN ASSY : IC5501)
• Inspecting the backup data, it is decited whether
the demonstration mode is done.
• The setting at default is "demonstration mode ok".
Standby setting
Standby