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KX-FT982LS-B / KX-FT984LS-B / KX-FT988LS-B
12.5.8. Digital Speakerphone (KX-FT988 only)
The digital speakerphone has different features from the analog speakerphone.
The analog speakerphone switches between Tx or Rx. Either Tx or Rx is able to pass through a telephone line or speaker,
depending on the Tx and Rx signal (voice) level. The higher-level signal (either TX or RX) can pass through the route.
Therefore, you never hear the other party's voice while you are talking. However, the digital speakerphone allows you to hear
the other party's voice while you are talking. So both Tx and Rx are active at the same time. There is also a difference in the
troubleshooting procedures between the two types.
At the start of communication, during the initial 2~3 correspondences, the digital speakerphone performs half-duplex operation,
alternating between transmission (Tx) and reception (Rx). Then duplex communication becomes available.
Learning occurs during the initial 2~3 correspondences in order to set the appropriate parameters for duplex communication.
You cannot check the digital speaker phone by the signal route test mentioned in the Analog Board Section because the level is
always changing as stated above.
Therefore, there is a service function for this troubleshooting. In this service mode, you can set the mute to either Tx or Rx. Then
you can check the signal route of the speaker phone Tx or the speaker phone Rx without any disturbances.
Summary of Contents for KX-FT982LS-B
Page 2: ...2 KX FT982LS B KX FT984LS B KX FT988LS B ...
Page 12: ...12 KX FT982LS B KX FT984LS B KX FT988LS B 6 Technical Descriptions 6 1 Connection Diagram ...
Page 14: ...14 KX FT982LS B KX FT984LS B KX FT988LS B 6 2 1 General Block Diagram ...
Page 22: ...22 KX FT982LS B KX FT984LS B KX FT988LS B 6 4 2 Block Diagram ...
Page 24: ...24 KX FT982LS B KX FT984LS B KX FT988LS B ...
Page 72: ...72 KX FT982LS B KX FT984LS B KX FT988LS B Countermeasure ...
Page 73: ...73 KX FT982LS B KX FT984LS B KX FT988LS B REFERENCE Test Mode P 55 ...
Page 74: ...74 KX FT982LS B KX FT984LS B KX FT988LS B REFERENCE Test Mode P 55 ...
Page 75: ...75 KX FT982LS B KX FT984LS B KX FT988LS B REFERENCE Test Mode P 55 ...
Page 76: ...76 KX FT982LS B KX FT984LS B KX FT988LS B REFERENCE Test Mode P 55 ...
Page 77: ...77 KX FT982LS B KX FT984LS B KX FT988LS B ...
Page 78: ...78 KX FT982LS B KX FT984LS B KX FT988LS B ...
Page 79: ...79 KX FT982LS B KX FT984LS B KX FT988LS B REFERENCE Test Mode P 55 ...
Page 83: ...83 KX FT982LS B KX FT984LS B KX FT988LS B ...
Page 109: ...109 KX FT982LS B KX FT984LS B KX FT988LS B NG Wave pattern Note Refer to NG Example P 114 ...
Page 111: ...111 KX FT982LS B KX FT984LS B KX FT988LS B I O and Pin No Diagram ...
Page 114: ...114 KX FT982LS B KX FT984LS B KX FT988LS B 12 5 6 2 NG Example ...
Page 116: ...116 KX FT982LS B KX FT984LS B KX FT988LS B ...
Page 121: ...121 KX FT982LS B KX FT984LS B KX FT988LS B 12 5 9 2 Troubleshooting Flow Chart ...
Page 128: ...128 KX FT982LS B KX FT984LS B KX FT988LS B 13 Service Fixture Tools ...
Page 134: ...134 KX FT982LS B KX FT984LS B KX FT988LS B 14 2 2 How to Remove the P C Boards and Power Cord ...
Page 138: ...138 KX FT982LS B KX FT984LS B KX FT988LS B 14 3 3 How to Remove the Separation Rubber Flap ...
Page 139: ...139 KX FT982LS B KX FT984LS B KX FT988LS B 14 4 Installation Position of the Lead Wires ...
Page 140: ...140 KX FT982LS B KX FT984LS B KX FT988LS B ...
Page 148: ...148 KX FT982LS B KX FT984LS B KX FT988LS B 15 2 3 4 Copying REFERENCE Sensor Section P 124 ...
Page 153: ...153 KX FT982LS B KX FT984LS B KX FT988LS B 16 1 4 Power Supply Board ...
Page 155: ...155 KX FT982LS B KX FT984LS B KX FT988LS B 16 3 Test Chart 16 3 1 ITU T No 1 Test Chart ...
Page 156: ...156 KX FT982LS B KX FT984LS B KX FT988LS B 16 3 2 ITU T No 2 Test Chart ...
Page 157: ...157 KX FT982LS B KX FT984LS B KX FT988LS B MEMO ...
Page 170: ...170 KX FT982LS B KX FT984LS B KX FT988LS B MEMO ...
Page 180: ...180 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 1 Operation Panel Section KX FT982 KX FT984 ...
Page 181: ...181 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 2 Operation Panel Section KX FT988 ...
Page 182: ...182 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 3 Upper Cabinet Section ...
Page 183: ...183 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 4 Lower Cabinet Section ...
Page 184: ...184 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 5 Gear Block Section ...
Page 185: ...185 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 6 Screws ...
Page 186: ...186 KX FT982LS B KX FT984LS B KX FT988LS B 20 1 7 Accessories and Packing Materials ...