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UF-5500 / 4500
11.2.10.2. DEFECTIVE ITS (Integrated Telephone System) Section
1. No speakerphone transmission / reception
Perform a signal test in the
ITS or the NCU section
and locate a defective point (where the signal disappears) on each route
between the microphone and the telephone line (sending), or between the telephone line and the speaker (receiving). Check the
components at that point.
(P.168) is useful for this investigation.
2. No pulse dialing
3. No ring tone (or No bell)
CROSS REFERENCE:
NG
Check Line current.
Is there any Line current exist?
Replace Q102~Q106
NG
Replace IC100, IC101
Connect a PBX and TEL line and
go to the off-hook. status
YES
YES
NO
NO
Does a ring tone signal
appear at pin 15 of IC100?
Following the ITS section, search for the point
where the signal disappears on the route between
IC300 and speaker and check the components
at that point.
(RINGING: Refer to CHECK SHEET.)
Replace IC100, IC101.
Replace C109, C110,
R106, R107, R112, R113
Check the bell detection circuit
(Refer to NCU SECTION).
Is the bell detection circuit OK?
Содержание UF-5500
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