Akai LCT42Z6TM, Service Manual

Page: 70 / 78

Appendix A
: Inverter Input Voltage Protection Circuit
The CAS is only defined as spec-in parameters, so LPL and Philips agree to make an appendix for inverter
input voltage circuit application in terms of LC420WU1-SL01
1.Input Voltage Protection Circuit definition
Input Voltage Protection Circuit perceive abnormal input voltage coming at the
Master & Slave inverter.
In case the inverter input voltage level is under 19.V or over 27.5V, this circuit operates
for preventing inverter’s abnormal operation.
If inverter input voltage come back normal condition, this protection circuit will be reset
and inverter works properly.
2. Input Voltage Protection Circuit Contents
The original purpose of inverter input voltage protection circuit is only for preventing inverter’s damage.
Please don’t regard this circuit and voltage level as the parameters which should be controlled.
1) High Voltage Protection : Over 27.5V
2) Low Voltage Protection : Under 19V
3. Agreement
The protection circuit can’t be eliminated without both of LPL and Philips agreement
27.5[V]
19[V]
on
OFF
Reset ON
OFF
Reset ON
OFF
Reset ON
OFF
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Ver. 1.0 July. 21, 2005