Brother DP-525CJ Service Manual page 114

REPAIR
SERVICE MANUAL
2 Upper digit = B
An error has occurred in the DTR
open.
The lower digit expresses the status by bits.
Bit 0 = 0: DSR = HIGH when DTR = LOW
Bit 0 =
Bit 1 = 0: DSR = HIGH when DTR = HIGH
Bit 0 =
3 Upper digit = C
An error has occurred in the TXD
open.
Lower digit = 0:
Lower digit = 1:
Lower digit = 3:
4 Upper digit = 1
An error has occurred in the RTS
connector set.
The lower digit expresses the status by bits.
Bit 0 = 0: CTS = LOW when RTS = LOW
Bit 0 =
Bit 1 = 0: CTS = HIGH when RTS = HIGH
Bit 0 =
Bit 2 = 0: CD = LOW when RTS = LOW
Bit 0 =
Bit 3 = 0: CD = HIGH when RTS = HIGH
Bit 0 =
5 Upper digit = 2
An error has occurred in the DTR
The lower digit expresses the status by bits.
Bit 0 = 0: DSR = LOW when DTR = LOW
Bit 0 =
Bit 1 = 0: DSR = HIGH when DTR = HIGH
Bit 0 =
6 Upper digit = 3
An error has occurred in the TXD
Lower digit = 1:
Lower digit = 2:
Lower digit = 3:
1: DSR = LOW when DTR = LOW (error)
1: DSR = LOW when DTR = HIGH (error)
The data sent to TXD is received at RXD.
Data cannot be sent to TXD.
Discrepancy between the data sent to TXD and the
data received at RXD
1: CTS = HIGH when RTS = LOW (error)
1: CTS = LOW when RTS = HIGH (error)
1: CD = HIGH when RTS = LOW (error)
1: CD = LOW when RTS = HIGH (error)
1: DSR = HIGH when DTR = LOW (error)
1: DSR = LOW when DTR = HIGH (error)
Data cannot be sent to TXD.
The data sent to TXD is received at RXD.
Discrepancy between the data sent to TXD and the
data received at RXD
3-51
DSR test executed whie the terminal is
RXD test executed while the terminal is
CTS, RTS CD test executed with the
DSR test executed with the connector set.
RXD test executed with the connector set.
Troubleshooting