Panasonic KX-TG2226B Service Manual page 49

(*1) See Handset Reference Drawing
(*2) See Adjustment Battery Low Detector Voltage
13.4. X201 Check
The confirmation is made under the "TX Power Check" mode of TEST MODE.
Equipment: Frequency counter
TP for measurement: TP_ANT
Measure range: 2472.64550 MHz ± 5 kHz (1ch) at Test Standby mode in
13.5. Adjustment Battery Low Detector Voltage
After replacing handset's DSP (IC201), Re-writing Battery Low voltage to EEPROM is required.
<How to re-write>
1. Set 2.7V for DC power supply.
2. Enter the test mode (Refer to
().---Should return to OPEN after entering the Test mode.
().
Test mode flow chart for Handset
49
TEST MODE ().
())