I've just obtained an early-model KX-TA624 with a KX-T7130 and a few
7030s, plus some goodies inside (caller ID card, OGM/FAX card, and
doorphone card). All of the ports work fine with the proprietary phones,
and with single-line phones that have electronic ringers. So far, so good.
However, I tried plugging in an old-school Western Electric Trimline
(electromechanical ringer, LED-lit keypad, no incandescent lights), and
if I try to call into it, the entire system will reset after it rings a
random number of times. The phone does not have A/A1 contacts, so I can
rule that out as a potential cause, and the LED keypad doesn't need a
transformer on the A/A1 leads the way the incandescent ones did.
The KX-TA624-5 at work has no such problem with old-style ringers. Did
Panasonic juice up the ring current on the later model units? I'm
leaning towards pulling out the OGM/FAX and doorphone cards and finding
a -5 system, since I want to be able to use some vintage phones on this
system.
Russ
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