LG GDK-20W - Manual (Page 25)

GDK-20W DIGITAL WIRELESS KEY TELEPHONE SYSTEM
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PMU Installation
The PMU must be installed to SLOT4 on the MBU basically for the system operation. Refer to Figure 3.4.2.
The PMU contains a lithium dry-cell to keep the memory contents and real-time clock functions during power off. The
battery is soldered to the PMU, and connected circuitry by an on/off DIP switch(SW2). So the DIP switch knob must be
ON position before the PMU installation.
The PMU provides two kinds of MOH sources, internal MOH and external MOH.
External MOH source is input through black screw-down terminal, CN5, on the PMU. Refer to Figure 3.4.4.
And there are five red LEDs on the PMU, the function of them are as follows.
LD1 Display system software operation
-. This LED will turn on and turn off at every 100 msec.
LD2 Display task changing (software testing purpose)
-. This LED will be turn on/off toggle when call task changing.
LD3 Display task changing (software testing purpose)
-. This LED will be turn on/off toggle when timer task changing.
LD4 Indication for DKT data comm. error
-. This LED will be turn on/off toggle for keyset data comm. Error.
LD5 Display task changing
-. This LED will be turn on/off toggle when DECT task changing.
Figure 3.4.4 PMU Installation