Problem building MMP

[loopin3]

Hi to all,
im building a MPP and i have a issue in step 5.
step by step i check everything if works fine:

• STEP 1&2 i checked TP2 with 5.02V and pin 4 of U8 with -4.94V.
• STEP 3 : i measure with scope the frequecy 1.08Khz at TP1
• STEP 4 : i measure on R1 about 350V with a homemade coil of 500uH, 2.5Ohm and 20cm of diameter.
• STEP 5 : i measure the voltage on TP3 with scope and multimeter and i have no change in voltage...

i try to put every metal object neaer the coil but the result is the same...
Is there somebody can help me?

Thanks in advance!

[Qiaozhi]

It looks like you do not have the coil connected correctly. Obviously the coil is connected to the TX connector, otherwise you would not see the 350V flyback, but you need to make the link between the TX and RX connectors. Check the coil configuration diagram.

[loopin3]

The coil configuration is, center PIN of pl2 shorted with center PIN of pl4 and one wire of coil, 0v of pl4 connected withe another wire of coil.. Its correct ?

[loopin3]

Ok i ha e the problem with One coil wire and i resolve it.
With voltmeter on tp3 i can see the change voltage with object but with scope i see this

[loopin3]

fixed a wire of the coil i continue with step 5 and 6 and everything Is working fine. I jave a problema in step 7 , on tp4 i measure 4.3V and dosent change adjusting R6 with pl3 pin1&2 shorted..
Why?