Panasonic KX-TC1881B, Service Manual

Page: 26 / 96

8.6.2.1. Handset-jig (HS JIG) for Base Unit
The handset unit jig also uses two modes: TEST SUPER LOW mode and NORMAL POWER
mode. These modes alternate when the handset CLEAR button is pressed:
(1) NORMAL POWER mode (Stand-By). In this mode the LCD will remain blank.
(2) TEST SUPER LOW mode. When the CLEAR button is pressed, the LCD will show TEST
SUPER LOW. This test simulates the handset is at very large distance from the base unit and
the TX signal from handset to base is very small.
Procedure: First place handset jig on base under test to charge (exchange security code); press
CLEAR and then TALK to operate. The LCD will show TALK and TEST. This means that the base
unit sensitivity is OK.
* In TALK mode, LCD display change to “TALK TEST” or “TALK” on [TEST POWER] mode or
[NORMAL POWER] mode.
* HS JIG becomes [NORMAL POWER] mode immediately after the power supply turning on.
NOTES:
1) If when setting the handset to TEST SUPER LOW mode, if handset beeps 3 times and the LCD
shows "No link to base. Place on cradle and try again", press 2, 5, 8, 0 simultaneously and then
disconnect battery. Re-install battery, place unit on cradle to get security codes and tries again.
2) Only KX-TC1851B with marks HS JIG can be used for troubleshooting. Regular KX-TC1851B
production samples does not have the software needed for troubleshooting.
3) You can differentiate the jig from a regular unit because the jig has silver bottom cabinet
(base) and back cabinet (handset).
8.6.2.2. Base Unit - jig (BS JIG) for Handset
The base unit jig uses two modes: NORMAL POWER mode and TEST POWER mode. These
26