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Samurai Appliance Repair Man's Blog



Using the Tech Sheet Schematic to Root Out Appliance Gremlins

tech sheet, schematic and 1 more...
We all love those jobs where, given the brand, model, and problem description, you walk into the house already knowing what the problem is. After you've worked as an appliance tech for a while, you start noting that every machine has weak points and particular failure patterns. Some failures become so well-known that the manufacturer will issue a service bulletin on it. But what about those jobs where it's not a clear case of plug n' chug, in other words, where you DON'T know exactly what part to replace to fix the problem? Well, that may be when you have to use the tech sheet schematic, your trusty meter, and that gray swirling muck betwixt your ears to track down a pesky electrical problem.

If you don't have much experience using schematics to solve problems, this article will give you some good, practical foundational information that'll help bring you up to speed. This won't be a theoretical primer on basic electricity and making electrical measurements-- I expect most of you reading this already have that-- nawsir, we's just gonna jump right into real-world appliance problems and get stuff fixed using schematic diagrams.

In this excursion into Appliantological Excellence, we're going to review three recent service calls I did on two refrigerators and a front load washer where I used the tech sheet schematic to ruthlessly hunt down the troublesome gremlins and terminate them with extreme prejudice. In all three cases, you'll see the actual schematics used and how they were crucial to planning and executing my victorious assault.

Fixing A No-Drum Movement Problem In A Frigidaire Front-Load Washing Machine

We've all been on the no-spin complaints in these Frigidaire front load washers. As long as the drum moves during tumble, you know with 98.76% certainty that the problem is a bad door lock assembly, like in this case. Easy repair, badda-bing, badda-boom, skip n' pluck to the next job and life is good.

But what about the case where the drum isn't moving at all, no tumble, no spin, no nuttin'? Could be a bad motor control board. Could be a bad motor. Could be a bad wire connection. Could be lotsa things. But when we're on a service call, "could be's" don't do us any good; we need to slam-dunk, dead-nutz KNOW what the problem is. After all, ain't that why we professional Appliantologists makes the big money? Posted Image



This video shows that sometimes finding the problem is just as much about finding voltage where it shouldn't be as much as it is about finding voltage where it should be. Using the schematic and ladder diagram on the tech sheet, I was able to prove that the problem was the motor control board because it was backfeeding 120vac to the pressure switch. Something had shorted on that board and it was toast. This justified the huge PITA of pulling this stack unit out of the closet in which it was installed (in a kitchen with new hardwood floors, no less!) to install the new board. And problem solved.


Fixing A Whirlpool Refrigerator That Intermittently Warms Up

This unit is the one with the small ADC board and mechanical cold control in the fresh food compartment control panel. It was intermittently warming up for randomly-varying lengths of time. A really tricky problem, this is one you need to catch in the act to effectively troubleshoot. In fact, I had already been out on this one two days prior to this call for the same complaint and could not find the problem since both compartments were cooling just fine when I arrived. The second time she called back, I got right out and caught this tricky bugger in the act.



Having two things bad at the same time on any one appliance is rare but it does happen and you have to be thorough and persistent to root out all the evil-doers. In this case, both the ADC board and the compressor start relay were bad.


Fixing a No-Cool Problem in a GE Side-by-Side Refrigerator

In this problem, the complaint was that the fresh food compartment was warm. A quick check in the freezer revealed that the evaporator fan motor wasn't running. Rather than tear apart the freezer right away, it's much easier on these refrigerators with a muthaboard in back to just go around behind the unit and do some quick checks right at the muthaboard to see if its sending voltage to the fan.

This is a case, also, where the original minimanual supplied with the unit was AWOL (as in gone) and I was using the copy that I had pre-loaded onto my Kindle Fire just in case. Having been burned like this before, I now always try to load the tech sheet, Fast Track manual, or minimanual onto my Kindle Fire before I run a service call on a unit. So in this video, you'll see me using the schematic on my Kindle Fire.



The lesson on this one is to expect the unexpected and don't get so caught up in the schematic that you overlook the simple things, like loose or unplugged wire harness connectors!


What's It All Mean, Seymour?

Using the schematic diagrams to troubleshoot electrical problems in appliances is not optional unless it's a very simple circuit or there's something visually burnt or disconnected. Knowing how to use the schematic can take away the guess work when trying to figure out which part to replace. The most authoritative schematic to use is the one that's on the tech sheet that came with the appliance. It supersedes the schematics in the service manual because there may have been late production revisions on that model that aren't reflected in the service manual schematics.

But don't count on the tech sheet to still be there with the appliance when you need it! About a third of the time I go out on service calls, the tech sheet is missing; either it was stolen by the sleaze bag who worked on the unit before me or the customer removed it for "safe keeping"... and then lost it. So always try to have the tech sheet for the model you're working on pre-loaded on your Kindle Fire, iPad or whatever tablet you use for storing and carrying technical documents on service calls before you run the call.

If you're not using some type of tablet computer as an information tool, you're really shooting yourself in the foot. You can buy a Kindle Fire for a little as $160! If you can't afford that for a bidness information tool, then there's something wrong with how you're pricing your service and you need to start using the Appliance Blue Book.

And if you'd like to see more videos like the ones in this article, subscribe to my YouTube channel! I'm usually filming these while literally single-handedly whuppin' up on some appliance bootay, so what they lack in production value they make up with edge-of-your seat excitement of live appliance repair action!


Understanding and Diagnosing Sensor Dry in Samsung Dryers

Posted by Samurai Appliance Repair Man, in Dryer Repair 20 March 2013 · 2,965 views
samsung, dryer, sensor

Understanding and Diagnosing SENSOR DRY
Category Home Appliances > Washing Machine > Dryer Model Code DV203AEW/XAA / DV203AGS/XAX / DV203AGW/XAA / DV203AGW/XAX / DV206AES/XAA / DV206AGS/XAA / DV206LEW/XAC / DV306LEW/XAA / DV306LEW/XAC / DV306LGW / DV316BGC/XAA / DV316BGW/XAA / DV316HEC/XAC / DV316LES/XAA / DV316LES/XAC / DV316LEW/XAA / DV316LEW/XAC / DV316LGS/XAA / DV316LGWXAA / DV317AEG/XAC / DV317AES/XAA / DV317AES/XAC / DV317AEW/XAC / DV317AGS/XAA / DV317AGW/XAA / DV326LGS/XAA / DV328AEG/XAA / DV328AER/XAA / DV328AEW/XAA / DV328AGG/XAA / DV328AGR/XAA / DV328AGW/XAA / DV337AEG/XAC / DV337AEG/XAP / DV337AEL/XAC / DV337AER/XAC / DV337AEW/XAC / DV338AEB/XAA / DV338AEW/XAA / DV338AGB/XAA / DV338AGW/XAA / DV4015JFW4/XAP / DV4015JJW/XAC / DV4015JJW2/XAC / DV4015JJW3/XAC / DV428AEL/XAC / DV428AEW/XAC / DV438AER/XAA / DV438AGR/XAA / DV448AEP/XAA / DV448AEP/XAC / DV448AEW/XAA / DV448AEW/XAC / DV448AGP/XAA / DV448AGW/XAA Added by STEVEP Registered date 10.21.2008 Description
Circuit Description and Operation

Sensor Dry Mode automatically measures the moisture in the load and shuts the dryer off when the proper level of dryness is reached. This sensor dry should not be confused with a temperature sensor, the sensor bars measure moisture and the temperature sensor “thermistor” measures temperature. Sensor dry uses nothing more than two metal bars inside the edge of the drum. These bars do not go bad unless they are physically damaged however it is always a good practice to clean them whenever servicing using some rubbing alcohol, especially when the unit gets older. Never use sand paper or other abrasive methods.

At the start of the cycle an estimated time will be displayed as the Main PCB monitors the sensor circuit for 3 minute after the 3 minutes the estimated time can increase decrease, stay the same or advance to off based upon the moisture detected. The unit will do this assessment multiple times during the auto cycle and can adjust the estimated time as needed.

Diagnostic Procedure:

The sensor dry bars can be checked easily by
placing a coin across both bars and checking for
continuity.
Being more specific the resistance values are listed
below
Dry Clothes = Infinity
Wet Clothes = ~190 ohms ±10%

The sensor bars can be also tested in diagnostic mode. Place a slightly damp cloth in the dryer, start a normal cycle then press the Temp + Signal buttons for 3 seconds. When there are wet items being dried, data will add up (from 0 to 1200 and repeating) as the wet clothes touch the sensor bars. If the sensor bar value does not increase as wet items contact it the sensor is defective.

NOTE: Select any Auto cycle without clothes hit start unit should run for 3-5 minutes and shut off.




SENSOR DRY Customer Education
Category Home Appliances > Washing Machine > Dryer Model Code DV203AEW/XAA / DV203AGS/XAX / DV203AGW/XAA / DV203AGW/XAX / DV206AES/XAA / DV206AGS/XAA / DV206LEW/XAC / DV218AEB/XAC / DV218AES/XAC / DV218AEW/XAA / DV218AEW/XAC / DV218AGB/XAA / DV218AGW/XAA / DV2C6BGW/XAA / DV306LEW/XAA / DV306LEW/XAC / DV306LGW / DV306LGW/XAA / DV316BGW/XAA / DV316BGW/XAX / DV316LES/XAA / DV316LES/XAC / DV316LEW/XAA / DV316LEW/XAC / DV316LGS/XAA / DV316LGS/XAX / DV316LGW/XAA / DV316LGWXAA / DV317AEG/XAA / DV317AES/XAA / DV317AEW/XAA / DV317AGG/XAA / DV317AGS/XAA / DV317AGW/XAA / DV326LGS/XAA / DV328AEG/XAA / DV328AER/XAA / DV328AEW/XAA / DV328AGG/XAA / DV328AGR/XAA / DV328AGW/XAA / DV337AEG/XAA / DV337AEG/XAP / DV337AEL/XAA / DV337AER/XAA / DV337AEW/XAA / DV337AGG/XAA / DV337AGG/XAX / DV337AGL/XAA / DV337AGR/XAA / DV337AGW/XAA / DV338AEB/XAA / DV338AEW/XAA / DV338AGB/XAA / DV338AGW/XAA / DV3C6BGW/XAA / DV3C6BGW/XAX / DV4015JJW2/XAC / DV428AEL/XAC / DV428AEW/XAC / DV438AER/XAA / DV438AGR/XAA / DV448AEP/XAA / DV448AEP/XAC / DV448AEW/XAA / DV448AEW/XAC / DV448AGP/XAA / DV448AGW/XAA Added by STEVEP Registered date 10.21.2008 Description

Usage and Customer Education:

Sensor Dry Mode automatically measures the moisture in the load and shuts the dryer off when the proper level of dryness is reached.
At the start of the cycle an estimated time will be displayed as the Main PCB monitors the sensor circuit for 3 minutes. After the 3 minutes the estimated time can increase, decrease, stay the same or advance to off based upon the moisture detected. The unit will sample moisture level multiple times during the auto cycle and can adjust the estimated time as needed.

The length of the dry time will be proportional to the size of the load as well as the moisture in the clothes. However there are several factors that will effect dry time. These can be installation issues such as improper venting or a clogged lint filter. Another reason for clothes not being fully dried is the fabric itself. For example, towels or jeans are very thick and can contain some moisture even though the outward edge is dry. For best results always wash like items such as towels with towels jeans with jeans etc. It is important that loads are large enough to make adequate contact with sensing bars for feature to work properly. The customer complaint for undersized loads would be “clothes not dry at end of cycle”. If consumer has the need to wash and dry just a few articles of clothing recommend using time dry for those loads.

NOTE: Always remember the time being displayed is an estimated time and can increase, decrease, stay the same or advance to off anytime during the cycle.

NOTE: Wrinkle Prevent Feature will extend cycle for 90 minutes. Drum will tumble with no heat and lights in control panel will oscillate.
Wrinkle Prevent is often overlooked as possible cause for long dry times or dryer never shuts off..



Source: Samsung Dryer Model #DV328AEW/XAA


Online Appliance Parts Ripoffs and Scams

Appliantology, newsletter
Floating like a butterfly and stinging like a bee, it's another killa issue of Appliantology.

I look out on the web and what do I see? Another frikka-frakka scammer got his eye on me.

How'm I 'posed to git the appliance parts I need wif all these little punks tryin' to make me bleed?

Ain't but one person got the truth, I know: SamuraiRepairman, here I go


Entrance Exam for Appliance Technical Data Sheet Writers

Posted by Samurai Appliance Repair Man, in General Appliance Repair Wisdom, Humor 19 March 2013 · 468 views
tech sheet

I've had f2 errors where the problem was a thermal fuse. Usually I test probe and fuse (if there is one), and reset ecm if possible before I replace a board on any oven, regardless of manufacturer or error codes.

With regards to tech sheet writers, the following question and response was found on 85 % of their requirement exams...

Posted Image

The problem is, their examiners consider it the correct answer.



Source: GE Oven Mod#JTP95WCW1WW F2 error code


Kitchenaid Dishwasher Runs about 10 minutes and then Stops: Service Bulletin

Posted by Samurai Appliance Repair Man, in Dishwasher Repair 18 March 2013 · 893 views
kitchenaid, dishwasher

Bad model#, but:
Posted Image


Customer Concern: Dishwasher stops approximately 10 minutes into the cycle, “cancel drains” and goes directly to standby mode (off).

Cause: Testing has determined that cycle stopping may result from a software error that can cause a false error code that cancels the cycle. Techs will see a 6-1 error code recorded in service diagnostics. This issue is very sporadic, and is affected by the location of the household and region of the country. Other conditions that may also cause this “cancel drain” cycle are: siphoning through the drain hose, severe sudsing, and debris in the sump.

Correction:
If the customer experiences a “cancel drain” issue, first check the following:
1. Make sure the dishwasher is installed according to installation instructions provided with the unit.
2. Check for water siphoning out through the drain hose. Ensure that the drain hose end termination point is above the water level in the tub. The drain loop attached to the side of the tub is not sufficient to prevent siphoning.
3. Check for severe sudsing or a malfunctioning Rinse Aid dispenser.
4. Check for locked rotor in wash pump.
5. Check for and remove debris in the bottom of the sump/chopper area.
6. Check for water supply and proper water level in the dishwasher.
7. If all the above checks are OK, then the control will need to be replaced with one that has the upgraded software designed to handle any additional power variation.

Verify new board is Control Board W10380685, the upgraded part.



Source: kitchenaid dishwasher KUDS301X runs only for 10 minutes then stops






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