Panasonic KX-TG5521RUB / KX-TGA551RUB Service Manual ▷ View online
29
KX-TG5521RUB/KX-TGA551RUB
9.1.3.2.
Handset
Note:
(*1) Refer to Troubleshooting by Symptom (Handset) (P.40)
Cross Reference:
Check Point (Handset) (P.40)
Power Supply Circuit/Reset Circuit (P.12)
Power Supply Circuit/Reset Circuit (P.12)
Check around Power Supply Circuit/Reset Circuit.
Check BBIC (IC1)
Does Handset make link with Base Unit?
(Correct working unit)
(Correct working unit)
Check around X1 and IC801 and adjust
clock frequency.
Refer to Check Point...(H).
clock frequency.
Refer to Check Point...(H).
NO
NO
NO
NO (*1)
NO
Is the voltage of "1.8V" about 1.8 V?
Refer to Check Point...(A).
Refer to Check Point...(A).
YES
YES
YES
YES
YES
YES
NO
NO
NO
Replace with a new Circuit Board.
Is the voltage of CP3.0V about 3.0 V?
Refer to Check Point...(Q).
Refer to Check Point...(Q).
Does the RF clock (CLK) oscillate: 10.368 MHz
in Handset Test Mode?
Refer to Check Point...(H).
in Handset Test Mode?
Refer to Check Point...(H).
YES
Is the NTP value OK?
Refer to Check Point...(I).
Refer to Check Point...(I).
Does Handset make link with CMD60 in
Handset Test Mode?
Refer to Check Point...(I).
Handset Test Mode?
Refer to Check Point...(I).
NO
Handset is OK. Check Base Unit.
YES
OK
Is there CMD60 (: DECT Tester)?
NO
NO
YES
Is the modulation OK?
Refer to Check Point...(J).
Refer to Check Point...(J).
YES
Is the Frequency Offset OK?
Refer to Check Point...(K).
Refer to Check Point...(K).
Adjust C10 voltage to 1.8 V.
Refer to Check Point...(A).
Refer to Check Point...(A).
... Continued to the next page.
Is the voltage of CP4.0V about 4.0 V?
Refer to Check Point...(R).
Refer to Check Point...(R).
30
KX-TG5521RUB/KX-TGA551RUB
Cross Reference:
Check Point (Handset) (P.40)
NO
NO
NO
YES
Is the Sensitivity Receiver OK?
Refer to Check Point...(O).
Refer to Check Point...(O).
YES
Is the Frequency Drift OK?
Refer to Check Point...(N).
Refer to Check Point...(N).
YES
Is the Power RAMP OK?
Refer to Check Point...(P).
Refer to Check Point...(P).
Replace with a new Circuit Board.
...
31
KX-TG5521RUB/KX-TGA551RUB
9.1.4.
Check the RF part
9.1.4.1.
Finding out the Defective part
After All the Checkings or Repairing
1. Re-register the checked Handset to the checked Base Unit, and Regular HS to Regular BU.
Note:
If you need to register a handset, refer to Registering a Handset to a Base Unit in the Operating Instructions.
1. Prepare Regular HS (Handset) and Regular BU (Base unit).
2. a. Re-register regular HS (Normal mode) to Base Unit (to be checked).
If this operation fails in some ways, the Base Unit is defective.
b. Re-register Handset (to be checked) to regular BU (Normal mode).
If this operation fails in some ways, the Handset is defective.
2. a. Re-register regular HS (Normal mode) to Base Unit (to be checked).
If this operation fails in some ways, the Base Unit is defective.
b. Re-register Handset (to be checked) to regular BU (Normal mode).
If this operation fails in some ways, the Handset is defective.
Base Unit is defective
Handset is defective
START
Registration of
Regular HS to
Base Unit
Registration of
Handset to
Regular BU
(other checkings)
Registration of Handset to Base Unit
(checked ones)
Registration of Regular HS to Regular BU
Yes
No
No
Yes
32
KX-TG5521RUB/KX-TGA551RUB
9.1.4.2.
RF Check Flowchart
Each item (1 ~ 3) of RF Check Flowchart corresponds to Check Table for RF part (P.33).
Please refer to the each item.
Please refer to the each item.
Note:
(*1) Base unit - refer to (G) of Check Point (Base Unit) (P.36)
Handset - refer to (H) of Check Point (Handset) (P.40)
Handset - refer to (H) of Check Point (Handset) (P.40)
Start
Link
confirmation
Normal
1
Control
signal
confirmation
X'tal
Frequency
confirmation
Range
confirmation
Normal
Check Range: Compare with a regular unit.
Check DSP interface parts.
(RF Block <->DSP on BU/HS P.C.B)
(RF Block <->DSP on BU/HS P.C.B)
Adjust X'tal Frequency. (*1)
GOOD
4
2
3
OK
OK
NG
NG
NG
NG
OK
OK
Click on the first or last page to see other KX-TG5521RUB / KX-TGA551RUB service manuals if exist.