Sony BVW-55, Maintenance Manual, Page: 72 / 942

2-14
BVW-55
ERROR-98 RF NV-RAM ERROR
(RF NV-RAM ERROR)
Description: The abnormal operation of an NV-RAM (DM-121 board) for RF system was
detected.
Sub error messages and Detecting conditions:
DM : When the error occurs in an NV-RAM (IC909 on DM-121 board) during
the data write or read.
TBC
: When the error occurs in an NV-RAM (IC1812 on DM-121 board) during
the data write or read.
Possible causes: Trouble of an NV-RAM indicated by sub error message
Protecting operation: None
ERROR-99 INTERNAL INTERFACE ERROR 2
(INTERNAL I/F 2)
Description: Abnormality was detected in the communication between SYS CPU (IC108 on
SY-272 board) and SERVO CPU (SV-206 board) or MPU (on DM-121 or SDI-
23 board).
Sub error messages and Detecting conditions:
SV : When the SERVO CPU (IC102 on SV-206 board) initialization at power-
on is in abnormal state.
DM
: When the communication with DM-121 board’s MPU (IC908) is in
abnormal state.
TBC : When the communication with DM-121 board’s MPU (IC1808) is in
abnormal state.
SDI
: When the communication with SDI-23 board’s MPU (IC455) is in
abnormal state.
Possible causes:
SV
:
.
DIP switch (S100 on SV-206 board) setting defect
.
Common RAM (IC300 on SV-206 board) trouble
.
Servo system (on SV-206 board) trouble
DM :
.
MPU control interface circuit (IC301, 311, and 312 on SY-272 board)
trouble
.
DM-121 board’s MPU (IC908) trouble
TBC
:
.
MPU control interface circuit (IC301, 311, and 312 on SY-272 board)
trouble
. DM-121 board’s MPU (IC1808) trouble
SDI : . MPU control interface circuit (IC301, 311, and 312 on SY-272 board)
trouble
.
SDI-23 board’s MPU (IC455) trouble
Protecting operations: When the sub error message is “ SV ”, enters the protection mode.
When it is except above, displays only this error.
2-2. Details of Error Messages