Hi all, I have a problem with some ATL HDI 5000 ultrasound machines that we bought. 5 of them were considered good and the 6th one faulty before arrival. While testing each of them on arrival, I noticed they were not booting up. When I removed all the boards as directed by the service manual, it boots up to the Philips screen. When I slot in the front boards, it boots, but when I include a back board, it doesn't boot, and vice versa. This happened with all the 5 machines. I also switched their Power Supply Module (PSM) boards. Still didn't work. Eventually, I then decided to try the PSM board from the 6th faulty machine, and surprisingly, all the boards worked as I placed them one after the other. This made me feel that all the other PSM are faulty. Unfortunately, as I placed in the last board, it booted to the Philips screen and immediately switched off and started showing the OVP TRIG light.
I switched off and on but since then, it has been showing the OVP-TRIG light.
I measured the voltages on the PSM boards for both the one considered not working and the one with the OVP TRIG. Below are the readings:
For the PSM considered not working
Without boards
P2 (in order)
-14.83
14.93
-11.87
11.99
-5.94
5.97
-5.26
5.05
P3 (in order)
0.02
-0.00
1 (no continuity)
0.01
4.98
2.49
5.12
2.48
With boards
P2 (in order)
-14.79
15.26
-11.85
12.21
-5.97
6.07
-5.26
3.29
P3 (in order)
-2.25
2.04
4.25
0.00
5.04
2.51
4.97
2.51
For the PSM with OVP TRIG
Without boards
P2 (in order)
0.02
0.01
0.00
0.01
0.01
0.02
0.00
0.00
P3 (in order)
0.00
0.00
4.14
0.00
0.01
0.00
5.02
2.51
With boards
P2 (in order)
0.16
0.10
0.02
0.00
0.01
0.00
0.00
0.00
P3 (in order)
0.00
0.00
4.16
0.00
0.01
0.03
5.06
2.49
Pls, I need help fixing this problem. Any help will be appreciated.
Kind regards,
Emeka
