Explanation; Sequence After Power On - Pioneer XV-DV740 Service Manual

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7.3 EXPLANATION

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7.3.1 SEQUENCE AFTER POWER ON

3 7 63 1515 0
Reset Start
Microcomputer
initialization
Model
identification
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 no pulse is input to the AC terminal (Pin 4) for about 60 msec when the microcomputer is in Memory Backup mode,
it will not do any processing.
.
• The unit will recover from Memory Backup mode if a reset command is input to the XRESET terminal (Pin 8).
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• It starts when the XRESET terminal (Pin 8) is "H" level.
Initialization routine
• The inputs to Pins 15 and 16 are inspected and the model identification is performed.
No
Main loop processing
No
Yes : Power ON
• The level of the POWER terminal (Pin 91) is "H".
• Only in DVD function, the level of the DVD RESET terminal (Pin 93) is "H".
• The speaker relay is turned on about five seconds after the power is turned on.
• The level at the RELAY ON/OFF terminal (Pins 34 and 35) are "H."
• The conditions are different depending on whether the headphones are connected
via the Headphones jack, or on the DSP mode.
• The system mute is released about six seconds after the power is turned on.
The level of the SYSMUTE terminal (Pin 94) is "H".
• Muting is not released in the following cases.
• When the main volume is 0.
• When the LINE 2 function digital input signal is not locked,
or when the DSP MUTE terminal (Pin 87) is in error.
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Microcomputer IC (PDC104A) (CONTROL Assy : IC5501)
• Whether Demonstration mode is entered or not can be
determined by inspecting the backup data.
• The default setting is "Demonstration mode OK."
Standby setting
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3 6 7 1 3
Standby
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XV-DV740
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7
2 9 9 4 2 8
1 5 0 5 8 2 9 9 4
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8
9 9
A
B
C
2 8 9 9
D
E
F
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