Sony DNW-A75 Maintenance Manual page 90

3-2. Details of Error Messages
ERROR-99 INTERNAL INTERFACE ERROR 2
(INTERNAL I/F 2)
Description: Abnormality was detected in the communication between SYS2 CPU (SS-83
board) and SERVO CPU (SS-83 board) or MPU (on EQ-75, DM-89, TBC-23A,
or SDI-41 board) or FL (level meter module).
Sub error messages and Detecting conditions:
SV:
EQ:
DM: When the communication with DM-89 board's MPU (IC906) is in
TBC: When the communication with TBC-23A board's MPU (IC202) is in
SDI: When the communication with SDI-41 board's MPU (IC455) is in
FL:
Possible causes: SV:
EQ:
DM: . MPU control interface circuit (IC2102, 2107, 2108 on SS-83 board)
TBC: . MPU control interface circuit (IC2102, 2107, 2108 on SS-83 board)
SDI: . MPU control interface circuit (IC2102, 2107, 2108 on SS-83 board)
FL:
Protecting operations: When the sub error message is "SV", enters the protection mode.
When it is except above, displays only this error.
3-20
When the SERVO CPU (IC103 on SS-83 board) initialization at power-
on is in abnormal state.
When the communication with EQ-75 board's MPU (IC908) is in abnor-
mal state.
abnormal state.
abnormal state.
abnormal state.
When the communication with FL (level meter module) is in abnormal
state.
. DIP switch (S101 on SS-83 board) setting defect
. Common RAM (IC2503 on SS-83 board) trouble
. Servo system (IC100 series or IC300 series on SS-83 board) trouble
. MPU control interface circuit (IC2102, 2107, 2108 on SS-83 board)
trouble
. Interface buffers (IC901, 902, 905 on EQ-75 board) trouble
. EQ-75 board's MPU (IC908) trouble
trouble
. DM-89 board's MPU (IC906) trouble
trouble
. TBC-23A board's MPU (IC202) trouble
trouble
. SDI-41 board's MPU (IC455) trouble
. Cable (between FP-117 board and level meter module) connection
defect or disconnection
. Level meter module trouble
DNW-A75/A75P