Panasonic KX-TD500 System Reference Manual page 1429

3.08 Progress tone failure (TSW card)
Error Code
Possible cause of
the malfunction
Countermeasures
Note
0600
1) Defective progress tone IC on the TSW card
2) Defective Tone Detector on the TSW card
Can 4 types of tones be heard from
a telephone ?
No
Replace the Progress Tone IC on
the TSW card
Is there a new related error mes-
sage in the Error Log, after pressing
the RESET button ?
Yes
Replace the TSW card
No good
1) Unless the Call Progress Tone failure is cleared, the following item is not
executed
• Tone Detector for the DISA / AGC card
*1. The "Reorder tone", "Ringback tone", "Confirmation tone 1/2/3/4" and
"Held Call Reminder" tones. Refer to Section 3-B-16.00 "Tone and
Ringing Patterns" for these tone patterns and frequency.
*2. Consult the nearest service center
15-E-11
*1
Replace the Tone Detector for
the TSW card testing
OK
End
Yes
*2
No