Read Panasonic KX-PRX120RUW / KX-PRX150RUB / KX-PRX120UAW / KX-PRXA10RUW / KX-PRXA15RUB Service Manual Supplement online
8
3.2.
Circuit Operation (Base Unit)
[Changed from original section "4.2.3. Telephone Line Interface"]
For KX-PRX120W
3.2.1.
Transmitter/Receiver
3.2.1.1.
Pulse Dialling
During pulse dialling the hookswitch (Q3, Q4) is used to generate the pulses using the HOOK control signal, which is set high
during pulses. To force the line impedance low during the “pause” intervals between dial pulses, the PULSE_DIAL signal turns
during pulses. To force the line impedance low during the “pause” intervals between dial pulses, the PULSE_DIAL signal turns
on Q2.
3.3.
DECT Frequency Table (MHz)
[Changed from original section "11.7. DECT Frequency Table (MHz)"]
For KX-PRX120W
3.4.
Troubleshooting Guide
3.4.1.
Troubleshooting by Symptom (Base Unit and Charger Unit)
3.4.1.1.
Check Point (Base Unit)
[Changed from original section "9.2.1. Check Point (Base Unit)"]
For KX-PRX-120AZW/KX-PRX150AZB
Ch. (hex)
TX/RX Frequency (MHz)
Channel 0
00
1928.448
Channel 1
01
1926.720
Channel 2
02
1924.992
Channel 3
03
1923.264
Channel 4
04
1921.536
Items
Adjustment
Point
Procedure
Check or
Replace Parts
(Q)* Audio Check
-
1. Link with Handset which is connected to Line Simulator.
2. Set line voltage to 48V and line current to 50mA.
3. Input -45dBm (600
2. Set line voltage to 48V and line current to 50mA.
3. Input -45dBm (600
)/1kHz to MIC of Handset.
Measure the Level at Line I/F and distortion level.
4. Confirm that the level is (*1) dBm ±5dBm and that the distortion level is
< 5% at TEL Line (600
Load).
5. Input -20dBm (600
)/1kHz to Line I/F.
Measure the level at Receiver of Handset and distortion level
(*Receive volume set to second position from minimum).
(*Receive volume set to second position from minimum).
6. Confirm that the level is (*2) ±4dBm and that the distortion level is
< 5% at Receiver (150
Load).
(*1) : Sending Level (*2) : Recieving Level
E/G/FR/JT
-1.0dBm
-18.0dBm
PD
-0.5dBm
-33.0dBm
RU
-2.5dBm
-33.0dBm
UA
-2.5dBm
-30.0dBm
FX
0dBm
-30.0dBm
CX
0dBm
-30.0dBm
UE
-1.0dBm
-18.0dBm
AZ
-3.5dBm
-30.0dBm
USA
-0.5dBm
-19.0dBm
Delete
Correction
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