Sequnce After The Power On - Pioneer XC-IS21 MD Servise Manual

QQ
3 7 63 1515 0

7.2.2 SEQUNCE AFTER THE POWER ON

Note 1 : IC No. or P∗∗ without name indicate the pin No.
of microcomputer.
Is P50 and P51 at "H" level ?
TE
L 13942296513
Perform the following process after
one second after the POWER ON.
Transfer the Function, Volume, BASS
and TREBLE data to the volume IC. (∗3)
Function : CD (∗4)
Initial setting of CD decoder IC.
P5 CDCONT : "L"
Perform the following process after
3.9 seconds after the POWER ON.
Release the system MUTE.
Perform the following process after
www
4.0 seconds after the POWER ON.
Release the speaker relay.
.
http://www.xiaoyu163.com
Standby states
POWER ON
P17 SYSPOW : "H"
Power is ON.
System bus communication (∗1)
Transmit the bus data.
Transfer the system POWER ON.
P45 LCDRST : "L" RESET
Initialize the LCD Driver.
Starts the LCD communication (∗2)
DECK control IC starts
Microcomputer
the data transfer.
Does CD door open ?
No
Yes P94 : "H"
Close the CD door.
Initialize the MD.
Function : TUNER (∗5)
Initialize the TUNER PLL IC.
P28 TXPOW : "H"
The condition that MUTE
is not released.
P22 SYSMUTE : "H"
x ao
y
P21 SPCONT : "H"
i
http://www.xiaoyu163.com
8
P28 VOLDATA
Transfer
P34 VOLCLK
P75 EXPCE
MD Initialize Sequence
Q Q
3 6 7 1 3
No
• VOLUME : 0
u163
.
2 9 9 4 2 8
Note ;
∗1 : System bus communication
P18 CLK
P19 DATA
P20 REQ
∗2 : Starts the LCD communication
P47 LCDCLK
P44 LCDCE
P46 LCDDATA
∗3 : Transfer the Function, Volume, BASS
and TREBLE data to the volume IC.
P13 VOLCE
P15 VOLDATA
P16 VOLCLK
∗4 : Initial setting of CD decoder IC
P100 CDCLK
P1 CDLAT
P2 CDDATA
∗5 : Initialize the TUNER PLL IC
P23 TXCE
P24 TXODAT
P25 TXCLK
P26 TXIDAT
1 5 0 5 8 2 9 9 4
Release power
P70 MDPDOWN "H"
down detection
50 msec ?
Yes
Release the
P69 MDRESET "H"
mechanism reset
P67 MDSTB
Power on
P79 MDIDAT
P80 MDODAT
P81 MDCLK
m
co
XC-IS21MD
9 9
2 8 9 9
85