13-2
13. CIRCUIT DESCRIPTIONS
13-2. AC INPUT & POWER CIRCUIT
Function
- Generates a required DC power of 12V or 5V in case of supplied or disconnected AC power.
Description
- When AC 220V is applied to CN3, D16 D19 transforms it to DC 300V.
- DC 300V is generated for the LVT1 secondary source by IC3 and PC1 turning on/off.
- The secondary 12V depends on the ZD1 value.
- The 8V for the LVT1 secondary source is transformed to DC 5V through IC4.
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