Sony DNW-A100 Maintenance Manual page 96

3-1. Error Message
ERROR-08 DRUM MOTOR TROUBLE
Description: Malfunction of drum motor was detected.
When the drum FG cycle is shifted more than about ±30% continuously for
Detection conditions:
more than 10 seconds as compared with during normal rotation
Sub error message: None
Possible cause: . Drum motor trouble
. Drum microcomputer (IC314 on SS-63 board) trouble
. Drum motor drive circuit (DR-315 board) trouble
. Drum FG/PG waveform shaper circuit (DR-315 board) trouble
. Assembly defect during upper drum replacement
Protection operation: Stops the tape transport and enters the rest state in the unthread end state.
ERROR-09 TH/UNTH MOTOR LOCK
Description: Malfunction of threading or unthreading operation was detected.
Detection conditions: 1) When no operation is completed within about six seconds after operation
2) When no threading FG is output within about 0.4 second during threading
3) When states other than unthread end are continued for more than six seconds
Sub error message: None
. Unthread end sensor (TR-79 board) trouble
Possible cause:
. Thread end sensor (TR-79 board) trouble
. Thread end/unthread end input port (IC1 on MS-50 board) trouble
. Threading motor trouble
. Threading FG sensor (PTC-54 board) trouble
. Threading FG waveform shaper circuit (MS-50 board) trouble
. Threading motor drive circuit (DR-315 board) trouble
. Threading mechanism trouble
Protection operation: Ejects the cassette during cassette insertion or ejection.
Enters the protection mode during tape threading/unthreading.
Stops the tape transport and enters the rest state in cases except the above.
3-8
start
motor drive
in case that the unit should be in the unthread end state
DNW-A100/A50/A45
DNW-A100P/A50P/A45P