Power On Sequence - Pioneer XV-HTD50 Service Manual

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7.1.4 POWER ON SEQUENCE

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Reset start
Microcomputer
initialization
Model
discrimination
Demonstration mode
permission
Yes
Demonstration mode
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demonstration
mode?
System power supply on
DVD microcomputer start-up
Relay release
Demonstration mode
or Normal power ON mode
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* 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).
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• It starts when the XRESET terminal (Pin 11) is "H level".
Initialization routine
• The input of Pin 20 is inspected and the model discrimination is done.
No
Main loop processing
No
Yes :Power ON
• 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.
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Microcomputer IC (PDC092) (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
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Standby
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XV-HTD50
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A
B
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D
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F
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