B&K RF Signal Generator Repair
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Help! Does anyone know where I can get my B&K E200D signal generator repaired. It is solid state and I think that is what is keeping people away.
It worked really good until it quit. No output on any frequency.
I have the manual including schematic and troubleshooting guide.
I found someone in Canada to look at it but shipping one way would be $54.00.
Thanks,
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
(This post was last modified: 05-09-2013, 07:09 PM by Eric Adams.)
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Eric,
what is wrong with getting an oldie but goodie tube or maybe transistor generator?
I am a professional in both the field of electronics troubleshooting and the field of electronics design, but I would never go for solid state unless it was soooooooo cheap that losing it would be unnoticeable. They will not give you the schematic and there may be proprietory chips, CPLDs, microprocessors with code I have no idea how to fix.....
I never buy equipment I cannot fix myself.
basically what I am afraid of, the repair alone, without shipping, may run you more or at least be comparable to the cost of a new unit. No one really repairs those unless they are under warranty.
What are they, 200-300 bucks?
(This post was last modified: 05-09-2013, 07:07 PM by morzh.)
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
I have the manual including schematic and troubleshooting guide.
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Well, does it use chips and what kind? Any micros? Does the digital part (interface/display) work and no signal, or nothing works at all?
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
No chips or micros all components including a few transistors are on circuit boards. The power light goes on. The moduation meter operates as well as the crystal calibrator. The carrier strength meter is dead and there is no output. I know nothing about solid state circuits. H**l, I'm not even comfortable with tubes yet!
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Can you post the schematic? Or a link to it?
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
(This post was last modified: 05-10-2013, 08:34 AM by Eric Adams.)
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
OK.
Do you know how to check a transistor?
If not, here's how:
1. Take an ANALOG Ohmmeter.
2. Set it to Ohms, x1 range.
3.
For an NPN transistor:
Put a positive lead to the base, and touch the emitter and collector with the negative. It should conduct. Reverse the leads. Do the same. There should be no conductivity at all. Any conductivity means leakage and the transistor is bad.
For a PNP transistor: same procedure, only leads are reversed. Negative to the base conducts, positive - does not.
4. For any transistor: put one lead to emitter and another to collector. There should be no conductivity. Reverse leads, same thing.
Transistors rarely lose their H21E (Beta) so as long as the integrity test above is good, your transistor is good.
Now that you know that:
Take your schematic, and start checking transistors starting from Q3 and back.
Question: do you have a scope?
PS> Eric, I can guide you through it, but you need to have a basic equipment. A scope would make it easy.
(This post was last modified: 05-10-2013, 02:05 PM by morzh.)
Posts: 1,107
Threads: 88
Joined: Jun 2011
City: Tacoma
State, Province, Country: Washington
Don't forget to have him check from emitter to collector, too. I've had more than enough E-C shorts while the B-E and B-C seemed fine.
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
OK Morzh, I don't have an analog meter. DVM can't be used? I should have a scope in the next few day. It's way from Arizona. I'm willing to try.
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Brenda,
If you read my post one more time you will seed that the #4 is exactly that.
Posts: 15,444
Threads: 539
Joined: Oct 2011
City: Jackson, NJ
Eric
Yes you can check it with a DMM but I find it a PITB.
Put the DMM to "diode" check. When checking B-E/B-C where the analog meter shows condutivity you will see about "0.7V". In the opposite direction you won't see anything.
Same goes for the E-C check, you should not see any serious conductivity (maybe some megohms).
You can start doing that before the scope arrives.
Posts: 4,639
Threads: 51
Joined: Sep 2008
City: Sandwick, BC, CA
Also don't forget that if the transistor doesn't conduct in either direction B-C or E-B it could be open, that happens a lot especially with the older solid state stuff.
Regards
Arran
(This post was last modified: 05-10-2013, 08:13 PM by Arran.)
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
Thanks Guys,
I'll check it out and let you know.
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Posts: 825
Threads: 113
Joined: Aug 2012
City: The Villages
State, Province, Country: Florida
I checked the transistors. Three failed Q2, Q3 & Q10. Should I order new ones or do you think I should wait for the scope?
Eric
The Villages, FL
Member: Philco Phorum, ARF, ARCI & Radiomuseum.org
Users browsing this thread: 1 Guest(s)
|
Recent Posts
|
Cannot Adjust an IF Transformer’s cores
|
Joseph, now you are an engineer!!RodB — 06:37 PM |
PT-6 antenna connections
|
Hi, reading your explanation I can see the confusion. If you take it one connection at a time it should result in a desi...RodB — 06:34 PM |
Cannot Adjust an IF Transformer’s cores
|
It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original...jrblasde — 04:32 PM |
PT-6 antenna connections
|
I seem to have lost my way on this PT-6.
I see the antenna aerial transformer schematic - I’m reading pins 1 through ...bridkarl — 12:30 PM |
40-150 General questions
|
Good thing you're a good electrician ... the pictures show a lot of rewiring in your future! Take care and BE HEALTHY!...GarySP — 11:52 AM |
40-150 General questions
|
I think RobB has it right. It is a part number and looks like its stamped on the chassis and that wasn't something you ...klondike98 — 11:41 AM |
40-150 General questions
|
It's most likely a part number. Most of Philco part numbers are in that format. I looked at the parts list for this mode...RodB — 08:10 AM |
40-150 General questions
|
Hi Kevin,
No, I don't but I like your Quote about being a good electrician. The way I look at it is "The fact ...MrFixr55 — 08:06 AM |
Philco 38-7 Speaker
|
7K should be fine. While not a perfect match (This transformer is meant for 6V6 tubes), Antique Electronic Supply (AES)...MrFixr55 — 08:03 AM |
40-150 General questions
|
I discovered a stamp on the underside of the breadboard on my Philco 40-150. It is"56-1417' in black ink with numbe...Kevin_D — 07:14 AM |
Who's Online
|
There are currently 2740 online users. [Complete List] » 2 Member(s) | 2738 Guest(s)
|
|
|
![>](https://philcoradio.com/phorum/images/bootbb/asb/right_arrow.png)
|