Sony DNW-A100 Maintenance Manual page 103

ERROR-90 KEYBOARD INTERFACE ERROR
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This error message is displayed in the time data display area, but error code is not displayed. The error
message is not superimposed to the video monitor, and ALARM indicator does not light.
Description: The communication between the lower control panel (KY-364 board) and SIO
(IC1102 on SS-63 board) is not normal.
Detection conditions: The microcomputer (IC104 on KY-346 board) on lower control panel cannot
receive transmit signal from SIO
Sub error message: None
. Cable connection defect or disconnection
Possible cause:
. Line receiver/transceiver (IC102 on KY-364 board) trouble
. SIO (IC1102 on SS-63 board) trouble
Protection operation: None
ERROR-91 SYSTEM REFERENCE NOT EXIST
Description: Abnormality was detected in the system reference signal (VD).
Detection conditions: When the VD signal is not input to IC1903 on SS-63 board in a system control
system for more than a fixed time period
Sub error message: None
. Servo IC (IC313 on SS-63 board) trouble
Possible cause:
. Servo CPU (IC103 on SS-63 board) trouble
Protection operation: Enters the protection mode when abnormality is detected by the servo system
(Servo CPU).
Displays only this error when abnormality is detected by only the system control
system.
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
3-1. Error Message
3-15