General Information; Diagnosis; Sequence After The Power On - Pioneer XC-IS22VCD Service Manual

7. GENERAL INFORMATION

7.1 DIAGNOSIS

7.1.1 SEQUENCE AFTER THE POWER ON

Note 1 : IC No. or P∗∗ without name indicate the pin No.
of microcomputer (IC5501).
Standby states
POWER ON
Power is ON.
Transmit the bus data.
Starts the LCD communication (∗2)
DECK control IC starts
the data transfer.
Initialize the DECK.
Transfer the Function, Volume, BASS
and TREBLE data to the volume IC. (∗3)
Does CD door open ?
Is P57 and P58 at "H" level ?
Close the CD door.
Function : CD (∗4)
Initial setting of CD microcomputer IC.
P84 CDCONT : "L"
Perform the following process after
4.9 seconds after the POWER ON.
Release the system MUTE.
P73 SYSMUTE : "H"
Perform the following process after
5.0 seconds after the POWER ON.
Release the speaker relay.
P77 SPCONT : "H"
P78 SYSPOWER : "H"
System bus communication (∗1)
Transfer the system POWER ON.
P86 VOLDATA
Microcomputer P87 VOLCLK
P88 EXPCE
No
Yes P99 : "H"
Function : TUNER (∗5)
Initialize the TUNER PLL IC.
P67 TXPOW : "H"
The condition that MUTE
is not released.
• VOLUME : 0
• CD and DECK Function : Under a STOP of operation.
Note ;
∗1 : System bus communication
∗2 : Starts the LCD communication
∗3 : Transfer the Function, Volume, BASS
and TREBLE data to the volume IC.
∗4 : Initial setting of CD decoder IC
∗5 : Initialize the TUNER PLL IC
Transfer
DECK Initialize Sequence
MOTOR ON
Does the DECK Head down ?
(Is the MODE SW OFF ?)
No
Is three times ?
No
500 msec.
solenoid is ON ?
MOTOR OFF
XC-IS22VCD
P8 SCLK
P9 SDATA
P10 SREQ
P97 LCDCLK
P96 LCDCE
P95 LCDDAT
P85 VOLCE
P86 VOLDATA
P87 VOLCLK
P100 CDCLK
P99 CDDIN
P98 CDDOUT
P27 CDDS
P91 TXCE
P93 TXODAT
P92 TXCLK
P64 TXIDAT
Check P52 TC MODE
input is "L".
Yes
Yes
Retry it to two times.
IC2601(BU4094) P12 is "H"
IC2601(BU4094) P11 is "L"
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