Panasonic KX-FP363UA Service Manual ▷ View online
6.6.7.3. NG EXAMPLE
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6.6.8. ANALOG BOARD SECTION
This chapter provides the testing procedures required for the analog parts. A signal route to be tested is determined depending
upon purposes. For example, the handset TX route begins at the handset microphone and the signal is output to the telephone
line. The signal mainly flowing on this route is analog. You can trace the signal with an oscilloscope. The signal flow on each
route is shown in the Check Sheet here. If you find a specific problem in the unit, for example if you cannot communicate with
the H/S, trace that signal route locally with the following Check Sheet and locate the faulty point.
upon purposes. For example, the handset TX route begins at the handset microphone and the signal is output to the telephone
line. The signal mainly flowing on this route is analog. You can trace the signal with an oscilloscope. The signal flow on each
route is shown in the Check Sheet here. If you find a specific problem in the unit, for example if you cannot communicate with
the H/S, trace that signal route locally with the following Check Sheet and locate the faulty point.
6.6.8.1. CHECK SHEET
Note:
{ }: Inside the digital board
[ ]: Inside the operation board
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3. No ring tone (or No bell)
CROSS REFERENCE:
CHECK SHEET (P.106)
NCU SECTION (P.150)
4. No tone dialing
CROSS REFERENCE:
CHECK SHEET (P.106)
6.6.8.2. DEFECTIVE ITS (Integrated Telephone System) SECTION
1. No handset transmission / reception and no monitor 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 handset microphone and telephone line (sending), or between the telephone line and the handset speaker
(receiving), or between the microphone and the telephone line (sending), or between the telephone line and the speaker
(receiving). Check the components at that point. CHECK SHEET (P.106) is useful for this investigation.
between the handset microphone and telephone line (sending), or between the telephone line and the handset speaker
(receiving), or between the microphone and the telephone line (sending), or between the telephone line and the speaker
(receiving). Check the components at that point. CHECK SHEET (P.106) is useful for this investigation.
2. No pulse dialing
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6.6.9. DIGITAL SPEAKERPHONE
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.
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.
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.
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.
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.
you can check the signal route of the speaker phone Tx or the speaker phone Rx without any disturbances.
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