Welcome to GOFASTMOTORSPORTS.com ... ... ... Green Flag - Green Flag - Go Go Go ... ... Brought to you by Ricks Satellite - Where the Big Dish Rules!

Ricks Satellite Wildfeed and Backhaul Forum
Register Latest Topics
 
 
 


Reply
  Author   Comment  
ksmike

Registered:
Posts: 512
Reply with quote  #1 
I got struck by lightning, and I'm trying to get things working again. The 9500 was my big dish reciever.

If you have your's open or have a pic that shows it, or even care to donate a damaged reciever to me great!!

You can see in the picture that the transistor is blown up, I want to change it out, and see if it will go. The thing is I can't tell if it was an H1A or an H2A.  I have the transistor pulled up for the servo voltage change so I could use that IF it's the right one.
(I'm sure I'll have to substitute a resistor in place of the transistor I take out)

Also notice that I am not sure if there was a resistor in the spot pointed at. The area is slightly dirty, and I can't tell if they left it out on purpose, or if it blew up.

I also have an S-10 that I'll be working on soon, I used it for the KU dish, and need a replacement for it as well.

Any help is appreciated I am without a reciever at the moment.

Mike


DSCN0216.JPG 
majortom

Avatar / Picture

Registered:
Posts: 4,937
Reply with quote  #2 
Hi ksmike,
I don't have one to look at, but...if there are other devices with the same markings inside the box elsewhere on the board, can you confirm whether the H1A or H1B smd devices in your box are an NPN or PNP transistor with your dmm? I would probably just determine the lead basing and replace with a general purpose transistor of similar lead base and hope for the best. About all we can do without proper documentation.

Looking around at various smd code marking cross references, depending on the device manufacturer may dictate what the device actually is...
Thus far in a handful of such smd marking referencees I can find on the net I haven't seen H1A or H1B yet, but have seen 'H1'...

Couple examples...
http://colorandcode.ru/spr/detali/smd_code.pdf
http://www.s-manuals.com/smd/h1


__________________
Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
ricardo's geo-orbit archive: https://web.archive.org/web/20150516202529/http://www.geo-orbit.org:80/sizepgs/tuningp2.html#anchor469886
ksmike

Registered:
Posts: 512
Reply with quote  #3 
Thanks Majortom,

Putting the wrong transistor in there could do more harm than good so step one is find out which it is. I also did a number of searches looking for info on the H1A, and H2A's and came up blank.

Looking at the board transistors standing off by themselves seem to be H1A's while transistors in pairs are both H1A, and H2A. So I have a little better than 50/50 chance if I use the servo voltage transistor at getting it right, because it's an H1A.

If I don't hear from anyone who can tell me for sure, I'll give it a wild shot and see.

Mike
andyinyakima

Avatar / Picture

Registered:
Posts: 1,520
Reply with quote  #4 
I was intrigue with this problem.

BCW69  manufactured by at least Fairchild and NXP are PNP transistors markings are H1* (the * is the code for place of manufacture). BCW70 is also PNP but higher ratings markings are H2*

The NPN compliments for these transistors are BCW71 and BCW72(higher ratings) they have a K1* marking and probably K2*

At least this is what I derived from data sheets.

http://www.nxp.com/documents/data_sheet/BCW69_BCW70.pdf

http://www.nxp.com/documents/data_sheet/BCW71_72.pdf

Looking at the files that majortom has, I did get perplexed.

See if you can find manufacture logos on any of the discrete devices in the general area of Q14.

I did not study the Fairchild datasheet very much.

Study your problem a little more, check your connected devices for shorts or opens. This device is may not be the only device that's bad. The picture looks fairly clean and I could not tell that your device was blown apart from the picture. And again see if you can come up with manufacture logo on any discrete device.

__________________
andyinyakima
-----------------------------------
Recs: TBS6983, TBS5925 __ Ant: 90cm on SG6100__OSes: Linux with v4l-updatelee drivers __ RPi2 with v4l-updatelee drivers

Open Book, Open Source, You have to Open it to Know what's in it!
ksmike

Registered:
Posts: 512
Reply with quote  #5 
Thanks andyinyakima,

I looked at those before, I'll have to look again. Right now the links aren't working for me for some reason.

It seems likely that one of them is npn, and the other is pnp.

I don't see any discrete devices with logo's on them.


I did figure out the missing resistor problem, it's there I just couldn't see it under the shellac.

If you click on the picture you can look down from the one I pointed at, and to the right and see Q39 is an H1A. I'm sure you can see the one pointed at is blown up.

I'll keep looking until I make the jump.

Mike
majortom

Avatar / Picture

Registered:
Posts: 4,937
Reply with quote  #6 
Quote:
Originally Posted by ksmike

Putting the wrong transistor in there could do more harm than good so step one is find out which it is.

No question, which is why I suggested buzzing out with your DMM any other transistors on your board that are also marked H1A or H1B to positively identify which are NPN, or PNP devices. They will commonly use same type device in as many portions of the design as possible. I am just guessing that you are seeing other devices marked elsewhere on your board as H1A and H1B, and you are not sure which is used in the position that is blown???



__________________
Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
ricardo's geo-orbit archive: https://web.archive.org/web/20150516202529/http://www.geo-orbit.org:80/sizepgs/tuningp2.html#anchor469886
ksmike

Registered:
Posts: 512
Reply with quote  #7 
The H1A's are npn, and the H2A's are pnp.

Yes I just want to know what it was that blew up. H1A, or H2A.

Thanks, Mike
majortom

Avatar / Picture

Registered:
Posts: 4,937
Reply with quote  #8 
Can you tell by tracing out the nearby circuit what the blown device's function is?
ie just a switch, vs small signal amplifier or something else? Maybe ya can tell by removing the blown device,
and measuring the dc voltages at the open 3 leads without any device there, whether it'd be using NPN or PNP in that position.
Obviously some function won't work during that test, but may at least allow ya to make an educated guess instead of a 50/50
crap shoot.

__________________
Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
ricardo's geo-orbit archive: https://web.archive.org/web/20150516202529/http://www.geo-orbit.org:80/sizepgs/tuningp2.html#anchor469886
ksmike

Registered:
Posts: 512
Reply with quote  #9 
I waited, and finally tried the transistor I had, and it didn't do anything. Front pannel is still blank. I knew it was  long shot, but it was worth a try. There is no telling how much stuff is burned up in that box.

Anyone know where to get a new one?

Thanks for the help anyway, Mike
majortom

Avatar / Picture

Registered:
Posts: 4,937
Reply with quote  #10 
Assuming all the DC voltages are present from the Pwr Supply and are Healthy?
If so then yeah agree, probably toast.


__________________
Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
ricardo's geo-orbit archive: https://web.archive.org/web/20150516202529/http://www.geo-orbit.org:80/sizepgs/tuningp2.html#anchor469886
virginiap20007

Registered:
Posts: 979
Reply with quote  #11 
Ksmike;  I think the 9500 is out of production.  You can try and find a used one or get a Linkbox which is a close kin.  Sorry for your loss.  I have a 9500 which I use the most.  I also bought a Manhattan awhile back, and I think it has a better scan plus good sig info.  Jess out in California
__________________
9ft.button hook mesh HtoH mount; 4dtv922 C/KU feed horn w/ slaved AZ prem, looped pan 9500, and a Manhattan at the end.. Got a philips suround sound in there and SONY BRAVIA TV
ksmike

Registered:
Posts: 512
Reply with quote  #12 
I've been looking at the linkbox. The problem I have is I need something that controls the polorotor motor. I keep seeing that you can use the optional polorotor kit that goes in the serial port, but I haven't been able to find one of those.

Thanks, Mike
majortom

Avatar / Picture

Registered:
Posts: 4,937
Reply with quote  #13 
that's why I built my own, because no one really makes one..
detailed in pages 5 and 6 of the following thread. Still working well...
http://rickcaylor.websitetoolbox.com/post/polor-rotor-control-5354840?highlight=polorotor+control&trail=75


__________________
Perfect 10 7.5' mesh Chapparal C/Ku Co-Rotor feed, Norsat 8115 CBAND, Norsat 4106A Ku Thomson Saginaw Actuator, Vbox positioner,
Home Brew Polarotor683 Servo circuit. Openbox S9, Prof7500, v4l-updatelee linux drivers installed.
ricardo's geo-orbit archive: https://web.archive.org/web/20150516202529/http://www.geo-orbit.org:80/sizepgs/tuningp2.html#anchor469886
mburrow

Avatar / Picture

Registered:
Posts: 48
Reply with quote  #14 
Rick shows to have a polorotor controller
http://www.gofastmotorsports.com/apc1.htm
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

Fellow Members, your posts are welcome here! Do not worry about posting everything perfect. Different receivers and LNB's will give you different Frequencies and Symbol Rates. Some set top boxes, PCI cards and USB receivers, Do Not Require all of the same information that others may need. It is not Required to post everything that others may need to tune in a feed. It is just most important to share the find. We can always adjust the Frequency and Symbol Rates and try the various Modulations and FEC's on our own receivers until we get a lock and then give a polite reply with what works for your receiver, as that information might help others as well. We all appreciate the efforts and energy of the Posters!

Thank You for Visiting GOFASTMOTORSPORTS.com - Keep Your Eyes on the Sky and the Track!