Pioneer f-502 Service Manual page 46

PDP434PU, PDP504PU, PRO434PU, PRO504PU, PDP435PU, PDP505PU, PRO435PU, PRO505PU
• Block diagram of the shutdown signal system
Note:
The figures 1 - 5 indicate the number of times
the LED flashes when shutdown occurs in the
corresponding route.
HD AUDIO AMP
ASSY
IC3504
AMP A_NG
IC3502
VOLUME IC
• Diagnosis of shutdown
SD Circuit in
LED
Operation
Communication
1 time failure of the
panel-drive IC
Communication
failure of the
module IIC
2 times
(Check the
shutdown
subcategory on
the Factory menu.)
Power decrease of
3 times
DIGITAL-DC-DC
Panel having
4 times
higher temperature
5 times Audio failure
PANEL IF
ASSY
A1 R7 R4
5
IC4002
EEPROM
A_SCL
2
A_SDA
Defective Assy
Communication failure
of IC4
DIGITAL VIDEO
Writing failure of IC4
Communication failure
DIGITAL VIDEO
of the EEPROM (4K)
Communication failure
of the EEPROM (2K)
PANEL IF
Disconnection of cable CN4009 - CN3501
Defective volume IC
HD AUDIO
Defective 114-pin FPC CN4004 - CN5001
Defective DC-DC
converter
DIGITAL VIDEO
Defective RST IC
POWER SUPPLY No startup of 12 V
Cable disconnected
DIGITAL VIDEO
Panel having higher
temperature
Speaker short-circuited Speaker terminals
HD AUDIO Defective AMP IC
HD AUDIO Disconnection of cable CN4009 - CN3501
DIGITAL VIDEO ASSY
IC5401
IC4
TXD_IC4
RXD_IC4
3
IC5302
1
CLK_IC4
IC4_CE
IC4_BUSY
RST2
D15
2
IC5201
MODULE UCOM
B_SCL
B_SDA
Reason for
Point to be Checked
Shutdown
IC4 BLOCK,
PANEL FLASH BLOCK
MODULE UCOM
BLOCK
PANEL IF BLOCK
HD AUDIO AMP Assy
DIGITAL DD CON
BLOCK
PANEL FLASH BLOCK
CN5202 - CN1071
Surrounding temperature
HD AUDIO AMP ASSY
46
IC5301
3.3V-RST
OR
IC5003
1.5V-RST
2
IC5206
EEPROM
E_SCL
E_SDA D4
4
TEMP1
Possible
Defective Part
IC5401, IC5305
IC5206
IC4002
IC3502
ADY1081
U5601
IC5301, IC5302,
IC5303
IC3504
PANEL SENSOR
ASSY
TE1
IC1072
TEMP.
SENSOR
Remarks
After turning the unit
on again, check if the
data on the version
can be read with the
GS1 command.
Check if the cable is
disconnected or not
securely connected.
Check if the 114-pin
FPC is broken or not
securely connected.
Check if 3.3 V, 2.5 V,
and 1.5 V are
activated.
Shutdown occurs
when the sensor
temperature becomes
77°C or more (PDP-
434P) or 83°C or more
(PDP-504P).
Check if the speaker
cables are in contact
with the chassis, etc.
Check if the cable is
disconnected or not
securely connected.