KX-TG6811UAB, KX-TG6811UAM, KX-TG6812UAB, KX-TG6821UAB, KX-TGA681RUB, KX-TGA681RUM - Panasonic Telephone Service Manual (repair manual). Page 36

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KX-TG6811UAB/KX-TG6811UAM/KX-TG6812UAB/KX-TG6821UAB/KX-TGA681RUB/KX-TGA681RUM
9.1.5.
Check Handset Transmission
Cross Reference:
Signal Route (P.18)
9.1.6.
Check Handset Reception
Cross Reference:
How to Check the Handset Speaker or Receiver (P.61)
Signal Route (P.18)
9.1.7.
Check Caller ID
Cross Reference:
Signal Route (P.18)
OK
Check MIC of Handset.
Check CDL TX (HANDSET) in Signal Route.
Check Handset Speaker in How to check the Handset 
Speaker or Receiver
.
OK
Check CDL RX (HANDSET) in Signal Route.
Check Caller ID in Signal Route.
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