Sequence After Power On - Pioneer XV-DV940 Service Manual

5

7.1.10 SEQUENCE AFTER POWER ON

Reset Start • It starts when the XRESET terminal (Pin 8) is "H" level.
Microcomputer
initialization
Model
identification
• The inputs to Pins 15 and 16 are inspected and the model identification is performed.
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 no pulse is input to the AC terminal (Pin 4) for about 60 msec, the microcomputer becomes 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).
5
6
Initialization routine
No
Main loop processing
No
• 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 four seconds after the power is turned on.
• The level at the RELAY ON/OFF terminal (E-VOL IC Pin1,Pin2) are "H."
• The system mute is released about four 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 digital LINE 1 function input signal is not locked,
or when the DSP MUTE terminal (Pin 87) is in error.
6
7
Microcomputer IC (PDC110B) (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
Standby
XV-DV830
7
8
A
B
C
D
E
F
95
8