Question about Dell (1N405) 180-Watt Power Supply

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The power supply of my computer is blowing the two thermistor connected to the fuse and rectifier circuit.Whats wrong?

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Check for the physical shot on the PCB
and check connect the black probe of the MM to the N of the main supply and track the supply path
regards

Posted on Sep 28, 2009

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2 Answers

Amp keeps blowing fuses


Blowing fuses, was caused by many thing.
Short of rectifier,resistor,elco,tube heater,tube pin, and also trafo itself (primary or secondary winding). It must check step by step.
CAUTION :
THIS IS HIGH VOLTAGE AREA.
RISK OF ELECTRIC SHOCK THAT CAN KILL.
DON'T DO THIS IF YOU ARE NOT TECHNICIAN OR NOT FAMILIAR WITH VACUM TUBE CIRCUIT. THE CIRCUIT MAY STILL CONTAINS ELECTRIC SHOCK EVEN IF IF THE AMP IS NOT POWER PLUGGED.


The simple steps (see picture) are:
  1. Disconnect all connection from secondary of power trafo (PLV,PDCH,PACH and PHV).
    Power ON the amp. If fuse is not blowing,trafo is good.
  2. Power OFF the amp. Unplug the cord.
    Connect PLV1-PLV2-PLV3 (this are Bias voltage,+/-15VDC and Backlight PCB voltage) to power trafo.Power ON the amp. If fuse is not blowing,PLV circuit is good.If fuse blowing,there are parts is damage (dioda,elco,7815/7915,resistor) in this PLV circuit.
  3. If step 2 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV circuit stay connected,connect PDCH 1-2 and PACH 1-2 to power trafo. Power ON the amp.
    If fuse is not blowing,PDCH and PACH circuit is good and all tubes heater/filaments are lights after a few seconds.
    If fuse blowing,there are parts is damage (dioda,elco,tube heater pins) in this PDCH/PACH circuit.
  4. If step 3 is good,go to next step.
    Power OFF the amp. Unplug the cord.
    With PLV,PDCH,PACH circuit stay connected,connect PHV 1-2 to power trafo.
    Power ON the amp. CAUTION: HIGH VOLTAGE AREA is ON.
    If fuse is not blowing,PHV circuit is good.
    If fuse blowing,there are parts is damage (dioda,elco,tube pins) in this PHV circuit.
.amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-0.jpg
Notes:
  • Steps had to be done sequentially from 1 to 4, not upside down.
  • If tube/heater pin is short,it can't be repair. The tube must be replacing.
  • PDCH circuit is voltage for V1-2-3-4 heater/filaments.
  • PACH circuit is voltage for V5-6-7 heater/filaments.
  • Always replace fuse with same type.

amp-keeps-blowing-fuses-01sk4vtrndbaaguwe2brflsj-5-1.jpg

Oct 02, 2015 | Peavey 6505 Plus 120W Guitar Amp Head

1 Answer

Why does it keep blowing fuses?


Hi Deborah,
Fuse is a protective device. When ever there is some short further in the circuit, there is an excess flow of current and fuse not being able to handle it blows off and thus restricts any further damage to the supply unit. Please check the components like rectifier, dc reservoir, power regulator etc in the power supply to find the cause of fuse blowing.

Aug 07, 2015 | Emerson LC320EM2 32" LCD HD Television

1 Answer

Carver r2000 keeps blowing fuse


Fuses blow when there's an overload. The most likely cause being a short-circuited semiconductor(s) located on the big heatsink. Other causes are a shorted device in the power supply section. Such as a rectifier or voltage control device.

Transistors tested with an ohm meter will show up as if you have touched the leads together when connecting across the terminals.

Oct 12, 2014 | Carver Audio Players & Recorders

1 Answer

My 2000 watts legecy amp is not working whats wrong with it?


HelloPower light doesn't come ON, means there is no power enters inside the circuits. There will be an over current protection fuse, inside the amp, meant to blow up, if any short circuit occur inside the circuit board of the amp, or at outside speaker connection. You should locate this fuse and check it. it will be a glass cartridge type, slided into a fuse holder. You can detach it from its holder by a hard pull out. Just locate it, detach it from the fuse holder, and check it with a multimeter, set in Ohms range. The meter should show continuity. If there is no continuity, means the fuse is blown up. Before replacing the fuse, you have to check the reason for its failure. Without rectifying the reason, if you insert an other fuse and switch ON the set, the inserted new fuse also will blow up. Sometimes, it may cause to further component damage too.So check the circuit for any short. You must have thorough knowledge in electronics and all tools to do the work. If you are not aware in electronics, get this set repaired by any experienced service technician. OK.

Dec 18, 2011 | Legacy Audio LA1490 Car Audio Amplifier

2 Answers

Panasonis 50" plasma, both fuses keep blowing when


This is a dead short, check power supply for diodes bad or zeners

Mar 08, 2011 | Panasonic Viera TH-50PX80U Plasma TV

2 Answers

Cannon-3300 Copier Error code E000-0000 rectify the problem


E000 0000
The reading of the main thermistor does not reach 30°C 1 sec after the main
power switch is turned on. Or, it does not reach 70°C 2 sec thereafter.

Main cause:
The fixing film unit is faulty. The main thermistor has an open circuit. The
fixing heater has an open circuit. The main power supply PCB is faulty. The
DC controller PCB is faulty.

Caution:
To reset the error, execute the following in service mode:
COPIER>FUNCTION>CLEAR>ERR.

Action:
1. Connector
Is the connector of the fixing assembly connected?
a. main power supply PCB (J8) <-> relay connector <-> heater
b. DC controller PCB (J320) <-> relay connector <-> thermistor
NO: Connect the connector.

2. Fixing film unit (thermistor)
Check the interval between pin 1 and pin 2 and between pin 3 and pin 4 of
the connectosr (4-pin) of the thermistor for electrical continuity. Is it ¥W
(open)?
YES: The heater has an open circuit, or the thermal switch is open. Replace
the fixing film unit.

4. Main power supply PCB, DC controller PCB.
Press the Start key. Is the drive voltage of the heater supplied by the connector
J8 of the main power supply PCB?
Main heater: between J8-1 (FSR1) and J8-5 (FSR COM)
Sub heater: between J8-3 (FSR2) and J8-5 (FSR COM)
YES: The heater drive power supply is faulty. Replace the main power
supply PCB.
NO: The thermistor control mechanism is faulty. Replace the DC controller
PCB.

Jan 18, 2011 | Canon imageRUNNER 3300 All-In-One Laser...

2 Answers

Blown fuse everytime it powers on


yes right there is a short circuit in power supply if you are non technical then replace the power supply if you are technical then open the power supply and check the 4diodes of bridge if faulty replace it again check transistor attatched to heat sink if faulty repalce it

Feb 28, 2010 | Pyramid (PS36KX) 600-Watt Power Supply

2 Answers

Not working after wrong settings


If your main power is 220Vac and it is set in 115Vac. It could be you actually fried your power supply.

Here is the reason, in common power supply after the rectifier diode when it is set in 115Vac, its circuit acts as a voltage doubler, its mean in its downsteams it actually uses around 220Vdc. And when you uses it in 220Vac it will connect directly as a rectifier.

When you set it in 115Vac and plug in 220Vac. In its downstream it could be in 440Vdc, then its an overvoltage everything that can't compensate will be damaged.

Hope I give you some info.

May 31, 2009 | Vantec iON 2 VAN-460N (VAN460N) 460-Watt...

3 Answers

Blows fuse


If you disconnect the degaussing coil and the set plays fine, it means one of 2 things is wrong. The degaussing thermistor could be shorted internally. I have seen this happen a few times on those degaussing thermistors that are in the little black boxes with 3 legs. Those boxes actually have 2 thermistors in them, one to do the actual degaussing and another connected directly across the AC to act as a heater for the degaussing thermistor. One of those thermistors could have "flashed over", which would blow the fuse the instant the set it turned on. The only other thing would be the wrong size main fuse. Without a degaussing coil the set probably draws about one amp, but the surge at turn-on with a degaussing coil could be as high as 4 amps. If you have the correct fuse installed and it blows at turn-on, replace the degaussing thermistor.

Aug 14, 2007 | Emerson EWC20D4 Combo

2 Answers

Fuse Blowing


A blown fuse is usually caused by a shorted regulator or a bridge rectifier circuit. Either way it is a problem in the primary power supply. A bad cord won't blow the fuse in the set, it will blow a circuit breaker in the house. A servicer usually would normally cover the inside of the set with a "few light slits in the AC cord". Hope this helps

Jun 02, 2007 | Sylvania 6626LCT 26 in. LCD Television

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