Pioneer f-502 Service Manual page 66

• Diagnosis of the shutdown
No. of times of
LED flashing
Category SD Circuit in operation
Category
Communication failure of the
Green 1 SD1
panel-drive IC
Communication failure of the
Green 2 SD2 module IIC (Check the shutdown
subcategory on the Factory
menu.)
Green 3 SD3
Power decrease of DIGITAL-
DC-DC
Panel having higher temperature
Green 4 SD4
(TEMP1)
Green 5 SD5 Audio failure
Communication failure of the
Green 6 SD6
module microcomputer
Serial communication failure of the
Green 7 SD7
3-wire of the main microcomputer
PDP4350SX & PDP5050SX
Defective Assy Reason for shutdown
Communication failure of IC4
DIGITAL VIDEO Assy
Writing failure of IC4
DIGITAL VIDEO Assy Communication failure of the EEPROM
MAIN BOARD Assy Communication failure of the EEPROM
AUDIO AMP Assy Defective volume IC
DIGITAL VIDEO Assy or
Disconnection of cable
AUDIO AMP Assy
Defective DC-DC converter
DIGITAL VIDEO Assy
Defective RST IC
PANEL POWER SUPPLY Assy No startup of 12 V
Panel having higher temperature
DIGITAL VIDEO Assy or
Disconnection of cable
PANEL SENSOR Assy
Speaker short-circuited
AUDIO AMP Assy Defective AMP IC
DIGITAL VIDEO Assy or
Disconnection of cable
AUDIO AMP Assy
Failure in Module Ucom or defective peripheral circuits
DIGITAL VIDEO Assy
Failure in writing in the Module Ucom
Disconnection of cable
MAIN BOARD Assy or
DIGITAL VIDEO Assy
Failure in communication (MTXD, MRXD) between the
IC5201(Module Ucom) and IC7207 (Main Ucom)
Failure in CELIA or defective peripheral circuits
MAIN BOARD Assy
Failure in MIKE or defective peripheral circuits
AV BOARD Assy Failure in IF Ucom or defective peripheral circuits
Failure in communication (TXD_IC2, RXD_IC2, CLK_IC2,
MAIN BOARD Assy or
IC2_CE, IC2_EMG) (TXD_IC3, RXD_IC3, CLK_IC3,IC3_CE,
AV BOARD Assy
IC3_BUSY) between one of the above devices and IC7207
(Main Ucom)
Point to be Checked
IC4 BLOCK,
PANEL FLASH BLOCK
MODULE UCOM BLOCK
IF BLOCK
AUDIO AMP Assy
CN4203(D18) - CN3501(A1)
DIGITAL DD CON BLOCK
PANEL FLASH BLOCK
Surrounding temperature
CN5202(D4) - CN1071(TE1)
Speaker terminals
AUDIO AMP Assy
CN4203(D18) - CN3501(A1)
MODULE UCOM BLOCK
CN7401(M6) - CN4201(D17)
CELIA BLOCK
MIKE BLOCK
UIF UCOM BLOCK
66
Possible
Defective Remarks
Part
IC5401
IC5305
After turning the unit on again,
check if the data on the version can
be read with the GS1 command.
IC5206
IC7405
IC3502
Check if the cable is disconnected
or not securely connected.
Check if 3.3 V and 1.5V are
U5602
activated.
IC5301,IC5302,
IC5303
Shutdown occurs when the sensor
temperature becomes 74°C or more
Check if the cable is disconnected
or not securely connected.
Check if the speaker cables are in
contact with the chassis, etc.
IC3504
Check if the cable is disconnected
or not securely connected.
IC5201
Check if the cable is disconnected
or not securely connected.
IC7004
IC7101
IC8705