Chapter 2: Service Error Codes
##552
[ TX ] DTMF IC malfunctioned
Cause
• The DTMF IC is faulty (failing to become
ready).
##553
[ TX/RX ] Contents of the password memory
Cause
• The memory is faulty.
Remedy
• Replace the unit that includes the DTMF
IC.
malfunctioned
Remedy
• Replace the unit that includes the password
memory.
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