Tool/software:
Hello team,
Customer found an abnormal issue of AMC1200 on MD system. Could you also help on this issue! Very thanks.
Failure Description:
1. When 220Vac On, VBUS voltage should normally show around 310Vdc, but this voltage shows 557Vdc. Voltage detection abnormality. When RD is trying to check the AMC1200 by multi-meter, when meter's probe (metal) come into contact with 1pin of AMC device, and VBUS voltage suddenly dropped 557Vdc to 0V.
2. When On 220VAC, VBUS voltage should normally show 310Vdc, but this voltage shows 0V, abnormal voltage detection, Use e-meter measurements or metal objects to touch AMC1200 PIN1 or PIN4 VBUS voltage to 300Vdc to resume normal
3. Multi-meter measurements or when metal contacts AMC1200's pins, The VBUS voltage will jump, which is not yet explained.
Customer had done the A-B-A swap. however, the failure is following with suspected device, not board system.
Here is the static impedance measurement between NG and Good. It looks suspected device is ok.
|
Electrical Measurement Data-Resistance(ohm) |
|||||
|
Position |
NG |
Good |
Position |
NG |
OK |
|
PIN 1 |
2.9M |
3M |
PIN 5 |
GND |
GND |
|
PIN 2 |
3.5M |
3.5M |
PIN 6 |
2.4M |
1.9M |
|
PIN 3 |
3.5M |
3.5M |
PIN 7 |
2.3M |
1.9M |
|
PIN 4 |
GND |
GND |
PIN 8 |
193.2K |
173.1K |
I'd like to send a AMC1200EVM to customer site to do the measurement to check if any electrical performance problem or not. What kind of test on EVM you suggest to do?
Or Do you have any ideal about this issue?
Regards
Brian
