Panasonic KX-TSC62SXW - Dialing and Ringing Issues; Tone Dialing Problems; No Ringing Sound

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KX-TSC62SXB/KX-TSC62SXW
8.4. Tone Dialing Problems
8.5. No Ringing Sound When Ring Signal is Input
Does the DTMF signal
appear at base of Q401?
Does the DTMF signal
appear at Pin56 of IC801?
Can the DTMF sound
be monitored ?
YES
YES
NO
Check Q401.
Check C481~C484,
R481~R483 and Q401
Check C481~C484 and
R481~R483
NO
Check IC801 and X2.
NO
YES
Is the voltage across Pin 8 and Pin 2 of
Check the telephone line.
Check R201 and C201
Does a sine wave of approximately 60V
or more appear across Tip and Ring?
YES
NO
YES
Call the unit from another telephone.
Does the tone ringer output signal
appear across Pin 5 and Pin 2 of IC1?
NO
NO
Check IC1, R202, R203,
C202 and C203
YES
Check the Ringer SW201
IC1 30 Vp-p?