Pioneer f-502 Service Manual page 28

Shutdown diagnosis
1 Panel microcomputer failure
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
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)
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.
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 the sensor
Sensor Temp 78
1 / 1 3
1
CENTE R Ve r s i on
MR M I A N
2
OSD Ve r s i on MR O D
3
CV I C Ve r s i on W2 0 0 / 1 0 9
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 Temp
13
Cen t e r A cu t ime
14
RESET OFF
15
Mon i t o r Ac u t i me
16
RESET OFF
17
Pu l s e Ac u t i me
18
RESET OFF
PDP-433PU
PDP-503PU
28
Screen display
E06
E06
E04
I NP U T 1 No S I G
E 2 0 0 1 / 0 9 / 2 5 H
S 2 0 0 1 / 0 9 / 1 0 A
/ 1 2 0 9 : 0 0 X2 0 0 / 1 0 9 / 1 2 0 9 : 0 7
TTX P G R 0 6 1
F6 9 1 1 0
- 0 0
- 0 5
0 1
0
4
0
+ 2 8
1 6 H 4 1 M
4 7 H 4 2 M
1 6 4
V2 0 0 / 1 0 9 / 1 2 0 9 : 1 0