Sony HDW-F500 Maintenance Manual page 113

ERROR-A3 SYS NV-RAM CHECK SUM ERROR
Description: Detected abnormal condition during read process of menu set up data is detected at power
ON.
Detecting condition:
When the checksum of the menu data saved in the NV-RAM does not match the value read.
Possible causes:
. Data nonconformity is occurred because of cut of power while updating menu data.
. Battery of the NV-RAM (IC414/SS-88 board) in the system control block has worn out or
is mounted incorrectly.
. Malfunction of the NV-RAM (IC414/SS-88 board) in the system control block or data
damage.
Protecting condition:
All menu data is changed to the default.
n
For the menu data may be damaged, the data is changed to the default.
After correcting the problem, select the menu contents again according to use before beginning use of the
unit.
ERROR-A4 PLAYER CONTROL COMMAND BUFFER FULL
Description: Transmission buffer of the 9-pin serial communication for player control becomes full.
Detecting condition:
Monitoring of read and write address.
Possible causes:
. When communication which exceeds the processing ability is carried out.
. Fault of 9-pin serial communication hardware on the SS-88 board.
Protecting operation:
None.
HDW-F500E MMP1
3-2. Error Messages
3-21