Question about Dual DWM-3900 System

1 Answer

Shuts off 5-10 minutes, no 12 vdc present, fan not turning

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 25 Answers

You'r fans are still good just the board is not giving it any power. I took myne apart and blew it out with my compresser and that helped some.... But i just got a 12V wall plug in screwed a hole in the back and ran diffrent wires to it.

Posted on Jun 17, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a G6A-3E heater. didn't work untill I cleaned the terminals on the t,stat It works but shuts off befor the water is hot!


Take a multimeter or 12 volt test light and probe terminals on Therm & ECO for 12 VDC power while running. When it shuts down and wateris not hot, test for voltage again at those terminals, If you have 12 volts to side of therm that goes to ECO beside it, then therm is ok, but then check opposite side of ECO as well. If power on one side of ECO, but not the other, the ECO is faulty. Simply walk across with probe testing for voltage when you find no power at one terminal but not the other, it's faulty, replace it.

Feb 16, 2013 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

Fan speeds don't drop and are constantly on full power.


Hello here is the homepage:

http://www.dell.com/support/drivers/us/en/04/Product/poweredge-1435sc

I had this problem on another pc, it helped by cleaning the whole pc out for dust, with compressed air.
And renewing the thermal paste, between the cpu and the cooling element.

Actual control of speed is base entirely on measured temperature at some appropriate point, and a setpoint. Whether 3-pin or 4-pin, the basic control strategy is the same. For the CPU, the temp sensor is built into the CPU chip. For the case or SYS_FAN or CHA_FAN, the temp sensor is built into the mobo at some point. In each fan control loop, the measured temp from its sensor is compared to a setpoint and used to slow down or speed up that fan.
HOW the speed of the fan is changed is what differs. On a 3-pin system, the mobo reduces the +12 VDC line voltage to slow the fan down. On a 4-pin system, that +12 VDC line is kept at that voltage always, but the special PWM signal is used inside the motor casing to control how much of the time that voltage is actually turned on to the motor. The chip using this signal is a simple on /off switch, turning on the feed of 12 VDC to the motor and turning it off again, very rapidly at the frequency of the PWM signal. That signal looks like a "square wave", except that is "% ON" is varied (not constantly 50%) to control fan speed.

Try also to upgrade the bios, and look for the settings for the fan.
Make sure the fans are connected right, to the mainboard.

Good luck

Jan 28, 2013 | Dell PowerEdge SC1435 Server

1 Answer

Fan on my big buddy heater just stopped working changed batteries still not working?tried the switch nothing .i only have radiant heat.


I would first check the wiring connections to fan and get a multi meter , set on 12 volts dc and see if fan motor has 12 vdc input voltage.
Too cheap to buy a voltage tester at wal mart ot harbor frieght, you can use a 12 volt bulb and socket, if you already have one. Remove fan wires & hook up 12 volt light bulb & if it lights, you got the juice. Carefull,dont let live wires touch because you short out $26.00 big buddy fan transformer. work with fan transformer unplugged from wall and dont plug in until you sure no wires touch.
use electrical or duct tape. electrical tape better.

otherwise,just buy the multi meter, they only $8.00 to $10.00
read & understand instructions, before you try to use it. otherwise,you could burn out your new meter.

well worth owning &
learning to use multi meter. I use it thousands of times.

if fan motor has juice but wont run, check fan shaft to see if it turns freely or scrapes or is stuck. oil fan motor bearings ,change the brushes.
make sure that the fan blades are not touching the fan housing and can turn freely.
if it still dont work, buy new fan motor.
if no juice at fan motor, check mr heater switch with the power off,unplug transformer from the wall or remove batteries.,
and use the ohm meter setting of the multi- meter to test for continuity of the switch when the switch is in the on position.
power must be off when using the ohm setting of a multimeter.
if power is on & using the ohm setting of the multi meter, you will blow out the multimeter. The ohm setting uses a 1.5 volt dc battery inside the multimeter to test for a compleated circuit.
so, 12volts dc would blow it out on ohms setting.
TESTING FOR OUTPUT OF FAN TRANSFORMER OR BATERY PACK.
If the switch is good,reinstall it on mr.heater and test the output of the transformer or battery compartment using the 20 volt dc scale of the multi meter. the voltage scale you select ,must be higher than the voltage you expect to find ,in order to avoid damage to the multi meter.
observe polarity,positive to red and negative to black.

the dc voltmeter setting is totally polarity sensitive and a reversed hook up could blow out the meter.
multi meter means it can read ac volts, dc volts,ohms and dc amps. Read and understand the included instructions before using a multi meter
a good single battery in new condition reads 1.62volts dc
1.5 vdc is almost dead, a good used battery reads 1.58 to 1.6 vdc
below 1.58 vdc is weak battery and 1.48 vdc is usually totally dead, but may be enough for momentary usage under 1 minute.

Sep 08, 2010 | Mr. Heater Big Buddy Heater

2 Answers

Same problem. red light flashes 3 times, but will not turn on.


Hi,

The blinking light means the controller QA01 in the AV_TERM system board is booting and driving the TIMER/REC RED LED light accordingly. This failure mode is true for many conditions, not exclusively for the main PS board PE0071. It could be caused by many things, LOW B, SEINE, AV_TERM, LCD, PROTECT, etc.

Specifically for PE0071+12VDC circuit failure, which is the most common , listen for the LINE relays SR80, SR81 coming online. If several (3) or more clicks are present when applying power to the TV set then suspect the +12, 20, +32 VDC inverter is faulty.

As a quick check, you can disconnect P807B. If the relays cycle every 1-2 seconds then is most definitely the +12VDC inverter. Check for voltage level at optocoupler Q881 pin 4 and this should not be cycling. This point is the VCC for the oscillator. Repair or replace board 75002913 as necessary.

TROUBLESHOOTING: (this is my own, not the OEM !, try at your own risk!)

  1. Check for LINE1 input voltage level at inverter on sheet [4].
  2. Check for LINE2 input voltage level at inverter on sheet [3].
  3. Check for STBY +5VDC & +25 VDC ( observe correct GND REF) page [4]of PE0071 POWER
  4. Check for +22 VDC out of regulator on page [3] out of Q822 Emitter
  5. Check P809B connector for :
  • P809B (12) POWER = 3.00 VDC (+/-0.2)
  • P809B (11) POWER_SIG = 0.00 VDC (HIGH to Power on TV)
  • P809B (10) PROTECT = 0.00 VDC
  • P809B (9) ACDETECT = 3.00 VDC (+/-0.2)
  1. Check for PFC_OUT = 368-371 VDC
  2. Check for +12, +20 & +32 VDC inverter page [5] of schematic manual.

For +12 VDC Inverter, suspect components:

Q880 STR-W6765 PSR (works really hot!!)
C888-C890
D884A and related switching circuit components.

Good luck,

mrwindex

Jul 03, 2009 | Toshiba 42HL196 42 in. LCD HDTV

2 Answers

Refrigerator totally inop. 120 VAC & 12 VDC present. Unit is model # RM3662.


Using one of the two power supplies is there any running sound. It is important that the van is not blocked by lint. The fan is easy to stall with spider webs and dirt. good luck

May 23, 2009 | Dometic RM2852 Refrigerator

2 Answers

Tv does not turn on. Makes ticking clock sound ?


Hi,

The blinking light means the controller QA01 in the AV_TERM system board is booting and driving the TIMER/REC RED LED light accordingly. This failure mode is true for many conditions, not exclusively for the main PS board PE0071. It could be caused by many things, LOW B, SEINE, AV_TERM, LCD, PROTECT, etc.

Specifically for PE0071+12VDC circuit failure, which is the most common , listen for the LINE relays SR80, SR81 coming online.(ticking clock sound) If several (3) or more clicks are present when applying power to the TV set then suspect the +12, 20, +32 VDC inverter is faulty.

As a quick check, you can disconnect P807B. If the relays cycle every 1-2 seconds then is most definitely the +12VDC inverter. Check for voltage level at optocoupler Q881 pin 4 and this should not be cycling. This point is the VCC for the oscillator. Repair or replace board 75002913 as necessary.

TROUBLESHOOTING: (this is my own, not the OEM !, try at your own risk!)

  1. Check for LINE1 input voltage level at inverter on sheet [4].
  2. Check for LINE2 input voltage level at inverter on sheet [3].
  3. Check for STBY +5VDC & +25 VDC ( observe correct GND REF) page [4]of PE0071 POWER
  4. Check for +22 VDC out of regulator on page [3] out of Q822 Emitter
  5. Check P809B connector for :
  • P809B (12) POWER = 3.00 VDC (+/-0.2)
  • P809B (11) POWER_SIG = 0.00 VDC (HIGH to Power on TV)
  • P809B (10) PROTECT = 0.00 VDC
  • P809B (9) ACDETECT = 3.00 VDC (+/-0.2)
  1. Check for PFC_OUT = 368-371 VDC
  2. Check for +12, +20 & +32 VDC inverter page [5] of schematic manual.

For +12 VDC Inverter, suspect components:

Q880 STR-W6765 PSR (works really hot!!)
C888-C890
D884A and related switching circuit components.

Good luck,

mrwindex

Mar 12, 2009 | Toshiba 42HL196 42 in. LCD HDTV

2 Answers

Toyota tacoma heater fan runs slowly in the 3rd & 4th positions


Using a voltmeter, the resisted voltage values for the fan motor are as follows:
LOW- 3 VDC
Med LOW - 6 VDC
Med HIGH - 9 VDC
High - 12 VDC

The fan resistor gets 12 volts from each position of the fan switch, and the 12 VDC is then lowered thru each of the 3 internal resistors inside the fan resistor. My guess is that the resistor has failed, and the resistance wires contained on it may have meshed together. The resistor is on the black box between the blower motor housing and the center of the dash. 2 phillips screws hold it in. Easy to remove/replace. Hope this helps, and thanks for choosing FixYa.

Nov 23, 2008 | 1983 Toyota Camry

2 Answers

My oven turns off on me after only a minute never heating up fully


Could be caused by either of following;

1. Faulty thermostat.
2. Faulty thermal cut out switch. (controls power to cooling fan).
3. Faulty cooling fan (not fan inside oven).

Test thermostat by setting thermostat to low temperature like 60 oC. If oven gets much hotter then its a faulty thermostat.
To test cooling fan and thermal switch take oven out and remove top or rear panels to expose components.
When oven gets hot the cooling fan should turn on. If it doesn't then check to see if there is a mains voltage present.
If mains current exist but fan is not turning then replace fan. If mains voltage is not present then its the thermal switch.

Jun 19, 2008 | AEG B1180-4 Electric Single Oven

2 Answers

Heater relay


First, turn on the fan motor to high, and then tap the bottom of the motor. The brushes stick to the armature, and tapping the motor will release them. Second, check for voltage at the connector for the motor. It should be 3 VDC at position 1, 6 VDC at position 2, 9 VDC at position 3, and 12 VDC at the highest position. No voltage at 1/2 & 3 = replace the heater resistor, located in the air box between the fan & the heater core. No voltage at all? Replace the fan switch.

Jun 07, 2008 | 1995 Toyota Pickup

Not finding what you are looking for?
Dual DWM-3900 System Logo

Related Topics:

162 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dual Audio Players & Recorders Experts

Mike
Mike

Level 2 Expert

99 Answers

Steven's...
Steven's...

Level 3 Expert

421 Answers

Tom Chichester

Level 3 Expert

31426 Answers

Are you a Dual Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...