Panasonic KX-TG2257BXS, Service Manual

Page: 36 / 91

10.9. Check the RF Unit
10.9.1. Defective Unit Check
The defective unit should be checked using the HS of Regular unit (working) and BS of Regular unit (working). Both* of Regular
unit (working) are required as the defect may be either in the handset or the base of the defective unit. For a defective BASE
UNIT, place HS of Regular unit (working) on the cradle of the unit and check to see that the handset links with the base. To
confirm that they do link, lift handset off the cradle and press TALK button. A beep is heard and in use/charge LED’s of the base
unit should turn on. For a defective HANDSET UNIT, place HS on the cradle of the BS of Regular unit (working) and check to
see that the HS links with the base. Again, press TALK button. A beep is heard and in use/charge LED’s of the BS of Regular
unit (working) should turn on.
See RF Check Flowchart (P.38).
See Check Table for RF Block (P.39).
Note:
*KX-TG2257 with marks HS JIG/BS JIG can be used only for troubleshooting. However, regular production set also can be used
as a JIG.
10.9.2. Converting a Regular Production Unit to a JIG
Both base unit and handset unit have two modes: TEST POWER LOW mode and NORMAL POWER mode even a Regular
production unit.
Each unit can be used as a JIG by changing the original NORMAL POWER mode to TEST POWER LOW mode.
• •
NORMAL POWER mode.
In this mode both base unit and handset unit can be used as a regular set.
• •
TEST POWER LOW mode, when production unit has been changed into a jig and will be used to check RF link.
In this mode it is for checking if the sensitivity of RF block for both base unit and handset unit are good or not. Procedure
as follows to enter this mode.
(1) Press “FLASH” and “ ” of the handset simultaneously, and keep it (10CH is taken for example).
(2) Place the handset unit on the cradle of the base unit. (A long beep sounds, and the display is not changed.)
As shown in below a) HANDSET, b) BASE UNIT
a) HANDSET
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KX-TG2257BXS