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RE: Repair of a CNG boiler control board

koudelad — Sat, 06 Jan 2018 09:32:40 GMT

By the way, I forgot to add an important information. The regulator reported that the heater switched 27 000 times before failure. This is probably true, 16 years, meaning ca. 1 700 times switched per year. This is ca. 4,6 switches a day (during summer, only water is heated, but the boiler is operable for the whole year).

I suppose the reported value is only for turning the heater on, which would mean 54 000 switches of the relay in total. Unfortunatelly, I can't find a datasheet for the relay to compare this value with an expected life.

RE: Repair of a CNG boiler control board

shabaz — Fri, 05 Jan 2018 22:41:03 GMT

Hi David,

Awesome job(s)! This series on repairs is really great. And good seeing the massive savings by not throwing out hardware. Spare parts for boilers are really expensive, and of course schematics are not always available, so the system is often against those who wish to self-repair : (

RE: Repair of a CNG boiler control board

mcb1 — Fri, 05 Jan 2018 22:23:02 GMT

I am glad the board was originally soldered using a lead solder, so I could do the work easily. I have no I idea whether I would be successful if the lead-free solder was used

Just add new solder and treat it the same way as you normally would.

Mark

RE: Repair of a CNG boiler control board

jw0752 — Fri, 05 Jan 2018 21:07:06 GMT

Good job,

I always wonder how many good boards and equipment end up in the landfill just because no one had the inspiration to attempt a fix. Good job and congratulations.

John

RE: Repair of a CNG boiler control board

tariq.ahmad — Fri, 05 Jan 2018 20:39:45 GMT

Thanks for sharing [mention:00dfb01ff12548938b4b7669fc69e778:e9ed411860ed4f2ba0265705b8793d05] !

It's never too late to post projects especially now.

We will be giving out shopping carts to give as part of the The Holiday Special .

Any project submitted while this event took place can receive a gift to give shopping cart from a community member for projects on:

Simple Electronic Repairs

Cool LED Display

The Holiday Special

as they all occurred while the event was taking place.

RE: Fixing R2D2's Brains

COMPACT — Thu, 28 Dec 2017 05:09:41 GMT

Obi Wan Kenobi - you're our only hope. Fsst.

RE: Fixing R2D2's Brains

DAB — Wed, 27 Dec 2017 19:52:51 GMT

Very cool fix.

DAB

RE: Fixing R2D2's Brains

Sean_Miller — Tue, 12 Dec 2017 03:06:03 GMT

Yep! Just enrolled a couple of days ago. He has his blue front arms crossed. (closest things to fingers he has)

RE: 1970's Sears 8 Track Repair

jw0752 — Mon, 27 Nov 2017 23:12:50 GMT

Hi Wesley,

I used to fix these things for a living 45 years ago. The pressure pad in the cartridge holds the tape snug against the head. Since the magnetism in the tape is so weak to start off with any gap or distance between the tape and the head will cause the sound to drop in and out and greatly affect the high frequency. The capstan is the shaft that the roller in the cartridge pinches the tape against. Below that is a fly wheel that helps to maintain consistent speed. The flywheel is linked to the motor by a rubber belt. When I saw how your machine was working I was suspicious of the belt first and the motor second. Time causes the rubber of the belt to deteriorate and slip. The motor itself probably has a mechanical centrifugal speed regulator. We often had trouble with dirty contacts on these motors and it would cause them to run erratically. If you remove the motor's back cap you will see the centrifugal regulator and you can easily clean the contact with a small burnishing file. Thanks for the great trip down memory lane. Oh I also wanted to mention that the head itself was mounted on a cam that could raise and lower it to 4 positions or tracks. That is what the lever is for near the top of the capstan. Each time the tape would cycle a piece of foil on the tape would trigger the mechanism to move the head to the next set of tracks. In the day we would also repair the tapes by winding them off the spool and putting them in new cases. It is quite an interesting system whereby the tape is pulled from the center and fed back onto the outside of the coil and the individual coils are constantly slipping against one another and collapsing towards the center of the spool.

John

RE: 1970's Sears 8 Track Repair

tariq.ahmad — Mon, 27 Nov 2017 21:55:48 GMT

Awesome!

RE: Fixing R2D2's Brains

DAB — Mon, 20 Nov 2017 19:46:25 GMT

I will be looking forward to seeing what is under the dome.

DAB

RE: Fixing R2D2's Brains

rsc — Mon, 20 Nov 2017 14:36:34 GMT

You should add a DLP projector............

[View:/resized-image/__size/342x250/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-51ac0ed0-f2d3-4561-a5f9-82873f6a6152/6786.contentimage_5F00_186042.png:342:250]

RE: Repair of tone control circuit in old transistor radio

mcb1 — Wed, 08 Nov 2017 02:24:25 GMT

Nice detail of a relatively simple repair.

There is far too much good equipment thrown away, when a few dollars, some time and a bit of know how will restore it to service.

It's a lot easier when you have the schematic and service information, and this is becoming scarce nowdays.

Well done.

Mark

RE: Repair of tone control circuit in old transistor radio

shabaz — Mon, 06 Nov 2017 23:41:13 GMT

Awesome repair log. Thanks for showing the board detail too, it was nice to see the little touches, the designers had fun : )

[View:/resized-image/__size/620x247/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-031819e2-8854-410e-ba50-33721c88c94c/2727.contentimage_5F00_185659.jpg:620:247]

I have a (far less exotic) pocket radio to repair sometime, it has some noisy slider volume controls : (

RE: Repair of tone control circuit in old transistor radio

jw0752 — Mon, 06 Nov 2017 21:11:57 GMT

I wonder how much of this great equipment ends up in the trash each year for lack of someone to just do a small repair like this? Nice job.

John