LG KE520 Service Manual page 120

5.2.2 In case of using the PIF( MON Port)
KE520 Handset
a. Preparation
- Target Handset (KE520)
- PIF
- RS-232 Cable and PIF-to-Phone interface Cable
- Power Supply or Battery
b. IBM compatible PC supporting RS-232 with Windows 98 or newer
If you use battery, you should have a battery with the voltage above 3.7V.
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Only for training and service purposes
PIF
POWER SUPPLY
4V
- 121 -
5. Download
PC with RS-232
LGE Internal Use Only