Sony DNW-A75 Maintenance Manual page 86

3-2. Details of Error Messages
ERROR-92 INTERNAL INTERFACE ERROR 1
(INTERNAL I/F 1)
Description: Abnormality was detected in the communication between SYS1 CPU (IC704 on
SS-83 board) and other CPU/MPU.
Sub error messages and Detecting conditions:
SY2:
KY:
FP:
50PIN:
RM NVRAM:
SY2:
Possible causes:
KY:
FP:
50PIN:
RM NVRAM:
Protecting operations: When the sub error message is "SY2", enters the protection mode.
When it is except above, displays only this error.
3-16
When the SYS2 CPU (IC1505 on SS-83 board) initialization at
power-on is in abnormal state.
When the communication with KY-438 board's MPU (IC104)
is in abnormal state.
When the communication with FP-117 board's MPU (IC6) is
in abnormal state.
When the communication with RM-130/190 board is in
abnormal state.
When the communication with RM-179/190 board is in
abnormal state.
. DIP switch (S1900 on SS-83 board) setting defect
. Common RAM (IC2500 on SS-83 board) trouble
. System control system SY-2 area (IC1500 series on SS-83
board) trouble
. Cable (between MB-818 board and KY-438 board) connec-
tion defect or disconnection
. Interface circuit (IC1102 through 1105 on SS-83 board)
trouble
. Line receiver/transceiver (IC102 on KY-438 board) trouble
. KY-438 board's MPU (IC104) trouble
. Cable (between MB-818 board and FP-117 board) connec-
tion defect or disconnection
. MPU control interface circuit (IC1400 through 1402 on SS-
83 board) trouble
. FP-117 board's MPU (IC6) trouble
. MPU control interface circuit (IC1400 through 1402 on SS-
83 board) trouble
. RM-130 board's MPU (IC2) trouble
or
RM-190 board's MPU (IC1) trouble
. MPU control interface circuit (IC1400 through 1402 on SS-
83 board) trouble
. RM-179 board's NV-RAM (IC1) or IC2 trouble
or
RM-190 board's NV-RAM (IC11) trouble
DNW-A75/A75P