Pioneer PDP-503PU Service Manual page 78

1
Shutdown diagnosis
1 Panel microcomputer failure
A
Condition : When a module microcomputer failed in communication
with a panel microcomputer
Results : An OSD is displayed for 30 seconds after the failure is
detected; then the power is shut down.
Possible causes
• Open/short-circuit of the communication lines in the assembly
2 DIGITAL-IIC communication failure
Condition : When a module microcomputer failed in communication with
B
an external EEPROM or EXPANDER
Results : An OSD is displayed for 30 seconds after the failure is
detected; then the power is shut down.
Note: A DIGITAL-IIC communication failure may occur in Standby mode.
Possible causes
• Open / Short-circuit of communication line in the DIGITAL VIDEO, MR
INTERFACE and AUDIO Assys
• Breaking of wire between the following points:
DIGITAL VIDEO Assy (D1) ↔ SW POWER SUPPLY Module (P2)
DIGITAL VIDEO Assy (D3) ↔ MR INTERFACE Assy (R3)
C
MR INTERFACE Assy (R23) ↔ AUDIO Assy (A24)
System Cable
3 Abnormally high temperature
Condition : when the internal temperature of the unit becomes abnormally high
Results : An OSD is displayed for 30 seconds after the failure is detected;
then the power is shut down.
Note: If the internal temperature of the unit becomes lower while the OSD is
displayed, the unit returns to normal operation.
D
Possible causes if this abnormality occurs in an environment in
which the temperature is not so high
Disconnection between the DIGITAL VIDEO Assy (D18) and temperature
sensor 1 (TE1)
Reference
Shutdown temperature of each temperature sensor
Sensor Temp 78
E
F
78
1
2
1 / 1 3
1
CENTE R Ve r s i on
2
OSD Ve r s i on
3
CV I C Ve r s i on
4
TTXP Ve r s i on
5
MON I TOR Ve r s i on
6
PANEL Ve r s i on
7
FLASH Ve r s i on
8
MON I TOR Mode l
9
Mod e l S l e e c t Ma i n
10
Mod e l S l e e c t AV
11
Mod e l S l e e c t MON I TOR
12 Sen so r e Temp
13
Cen t e r A cu t ime
14
15
Mon i t o r Ac u t i me
16
17
Pu l s e Ac u t i me
18
PDP-503PU
2
3
Screen display
E06
E06
E04
I NP U T 1 No S I G
MR M I A N E 2 0 0 1 / 0 9 / 2 5 H
MR O D S 2 0 0 1 / 0 9 / 1 0 A
W2 0 0 / 1 0 9 / 1 2 0 9 : 0 0 X2 0 0 / 1 0 9 / 1 2 0
TTX P G R
F6 9 1 1 0
- 0 0
- 0 5
0 1
0
4
0
+ 2 8
1 6 H 4 1 M
RESET OFF
4 7 H 4 2 M
RESET OFF
1 6 4
RESET OFF
3
4
9 : 0 7 V2 0 0 / 1 0 9 / 1 2 0 9 : 1 0
0 6 1
4