VIZ WP-705A Power Supply Troubleshooting

Original article can be found here: 


1. Blinking Display: Check power supply +5V.  Check U215 thru U218.

2. Improper readings: Check power supply +5V.  Check regulator U213 and U214 for normal operation.  Check voltages on U217/218.

3. Won't Zero: Check voltages on U217/218.  Check R227/228.  Check +5V supply.  Check C210/211.

4. No display but power supply has output: Check power supply +5V.  Check on-board regulators U213/214 for normal operation.  Check continuity of all VCC paths to active chips.

Simple 3.3volt power supply

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