Mic ETS2228 User Manual download pdf (Page 12)

ETS2228 Maintenance Manual

6~13 DATA BUS DB0~ DB7

14 Power supply VDD

15 Ground VSS

16 VOUT

17 CAP3P

18 CAP1N

19 CAP1P

20 CAP2P

21 CAP2N

DC/DC voltage converter.

CAP4P

23 V4

24 V3

25 V2

26 V1

This is a multi-level power supply for the liquid crystal drive. The voltage Supply

applied is

determined by the liquid crystal cell, and is changed through the use

of a resistive voltage divided

or through changing the impedance using an op.

amp. Voltage levels are determined based on Vss,

and must maintain the relative magnitudes shown below.

V0 ≧V1 ≧V2 ≧V3 ≧V4 ≧Vss

List 2 Lattice LCD Signals

 Keypad unit

In the ETS2288 series FWTs, the keypad is a peripheral component. If it is broken, it can be

directly replaced. And 72PIPU veneer uses 5×5 keypad。

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Mic ETS2228 User Manual Page 12