XV-DV740
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7.3 EXPLANATION
7.3.1 SEQUENCE AFTER POWER ON
Reset Start
Demonstration mode ?
Yes : Power ON
Yes
No
No
Microcomputer
initialization
Model
identification
Standby setting
• It starts when the XRESET terminal (Pin 8) is "H" level.
• The inputs to Pins 15 and 16 are inspected and the model identification is performed.
Demonstration mode
permission
Demonstration mode
System power supply on
Demonstration mode
or Normal power ON mode
• 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.
• 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).
• 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.
• Whether Demonstration mode is entered or not can be
determined by inspecting the backup data.
• The default setting is "Demonstration mode OK."
Standby
Initialization routine
Main loop processing
Microcomputer IC (PDC104A) (CONTROL Assy : IC5501)
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