Question about Fluke 744 Documenting Multifunction Process Calibrator

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Alway when i press on diod it pips continiously

The equipment have been misused by applying 100 voltage while pressing diode switch , it always pipes now when i press the diode switch and do not measure any resistance nor measure or produce any mA

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Return to Fluke for service, you must have blown something - unlikely that you will be able to repair and even if you do unit may be out of spec,

Posted on Oct 14, 2013

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Posted on Jan 02, 2017

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Hi. My uhf band cp 200 won't power up because it was placed in a charger .Please tell me what protection diodes I need to replace, and it's proximal location. Thank You.


Chargers have higher voltage ratings than the one it charges. It also lacks the needed filters to supply the exact direct current which damaged your equipment but first check if it blows up your fuses when you connect the power supply. If it does check for Zener Diodes usually connected to the mains of the equipment to simulate the simple crowbar effect of protection. If it does not blow up your main fuse then the fuse might be in the circuit board of your base unit. Zener Diodes are cased in striped crystal that short circuits itself when applied with reverse or higher voltage rating power supplies. You will need a multimeter positioned at continuity to test this. Remove it and replace the fuse then apply power, it will light up but remember to replace the damaged part for protection.

Feb 23, 2016 | Radio Communications

Tip

How to replace a microwave oven's diode:


Replacing a high voltage diode<br /><br />The first thing you must do to replace your microwave's diode is unplug the unit from the wall outlet.<br /><br />Next you will have to discharge the high voltage capacitor. A capacitor stores large amounts of electricity even when the unit is unplugged. It is necessary to discharge the high voltage capacitor in order to avoid receiving an electrical shock.<br /><br />Diode replacement is relatively straightforward because most high voltage diodes have a press fit, also known as Fast-On, or they have ring lugs. If your replacement diode can be installed either way, make sure you get the right polarity. Remember that a diode will conduct an electrical current when a forward voltage is applied, but when a reverse voltage is applied, there is no conduction.<br /><br />Remove the diode from your microwave and replace it with the new one. You may be able to crimp the new diode onto the wire leads, without welding or soldering them together. If you do crimp the diode onto the leads, be sure not to apply too much pressure, as this may cause connection problems either now or in the future. <br /><br />I hope this is helpful.<br />

on Dec 02, 2010 | Microwave Ovens

1 Answer

Whirlpool microwave keeps opening high voltage diode


If you do not have any experience in the repair of microwave ovens do not engage in their repairs because it is one of the most dangerous household appliances and the consequences can be disastrous. According to your description, low voltage circuit (220V or 110V) works well (light, turntable...). Obviously the problem is in a high voltage (HV) circuit which is made up of the magnetron, HV diode (rectifier), HV capacitor and HV fuse or protect diode. Failure is in any of these components in "HV circuit" or sometimes in interlock switch assembly or PC Board.

First, you must be sure which diode is blowed, reactifier or protect diode.

To check magnetron following this procedure:

Discconect the mains supply.
Check that the capacitor is discharged (by resistor 100 ohm / 10W or more).
Discconect the magnetron.
Measure the resistence between the disconnected terminals (should be app. 0.5 ohm).
Measure the resistance between the supply terminals (both) and earth. The resistance should be infinite.

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Dado

Mar 12, 2015 | Whirlpool MT4155SPS

1 Answer

How to fix a diode on a 94 nissan maxima


When replacing a diode always follow its polarity,You have anode and a cathode. on one end of the diode,the purpose of the diode is to limit the voltage.If you are replaceing the diode in the alternator it is shape one way,just unsolder it

Mar 13, 2012 | Cars & Trucks

1 Answer

Sc 990


SC990 [Cause]

Dirty contacts on Upper Right Cover Safety Switches. Toner gets inside the Upper Right Cover Safety Switches, which can lead to lower DC voltage being applied to the Laser Diode. Which leads to:

SC 990 eng_procon.c (when a normal Grayscale pattern was not detected 15 times consecutively during ID Sensor Grayscale pattern check) check with SP 7403 Service Code History look for Detail in history of SC 990.

LD Power not being strong enough to be read by Laser Synchronizing Detector causing a SC 322 or 326 depending upon timing.

5vdc not being fully applied to connector 403 pin 3 on the Laser Diode PCB causing an Open Cover Indication, or 24vdc not being applied fully to connector 107 pin 2 on the PSU PCB causing an Open Cover Indication.

Circuit Explanation: 5vdc (VCCD)is output from connector 403 pin1 of the Laser Diode PCB where it travels through 2 of the Upper Right Cover switches than through 2 of the Front Cover Safety switches before being applied to connector 403 pin 3 of the Laser Diode PCB where it is now used to power the Laser Diode. Lower voltage on pin 3 leads to lower laser diode output which causes the machine to raise LD Power (SP 2-103) when maximum values are reached, laser diode output can not be increased further which can lead to SC 322, SC 326 and/ or SC 990 eng_procon .c. If the voltage drops too low an open door indication is sent to the BICU PCB but a signal is not sent to the IOB PCB which tells the machine which door is open.

Note: An older Drum more than 150,000 copies can also lead to SC 990 by causing incorrect ID Sensor readings

[Resolution]

1. Clean the internal contacts or replace Right Door Safety Switches (2 of Part Number 1204 2521 and 1 of Part Number 1204 2529)

Clean and vacuum the PCU.
Clean the Toner Shield Glass, Charge Roller and ID Sensor.
Check Service history for Drum Life, if over 150,000 replace Drum (Part Number A230 9510)
Reset SP 2103 -1 thru 4 to defaults.(LD Power Adjustments)
Reset SP 2001-1 to its default. (Charge Roller Bias Adjustment)
Execute SP 3001- 2 (ID Sensor Initial Setting)

Sep 08, 2011 | Ricoh Aficio 450 Copier

1 Answer

What should I do to solve error sc 9900 appears when the machine is in operation


[Cause]

Dirty contacts on Upper Right Cover Safety Switches. Toner gets inside the Upper Right Cover Safety Switches, which can lead to lower DC voltage being applied to the Laser Diode. Which leads to:

SC 990 eng_procon.c (when a normal Grayscale pattern was not detected 15 times consecutively during ID Sensor Grayscale pattern check) check with SP 7403 Service Code History look for Detail in history of SC 990.

LD Power not being strong enough to be read by Laser Synchronizing Detector causing a SC 322 or 326 depending upon timing.

5vdc not being fully applied to connector 403 pin 3 on the Laser Diode PCB causing an Open Cover Indication, or 24vdc not being applied fully to connector 107 pin 2 on the PSU PCB causing an Open Cover Indication.

Circuit Explanation: 5vdc (VCCD)is output from connector 403 pin1 of the Laser Diode PCB where it travels through 2 of the Upper Right Cover switches than through 2 of the Front Cover Safety switches before being applied to connector 403 pin 3 of the Laser Diode PCB where it is now used to power the Laser Diode. Lower voltage on pin 3 leads to lower laser diode output which causes the machine to raise LD Power (SP 2-103) when maximum values are reached, laser diode output can not be increased further which can lead to SC 322, SC 326 and/ or SC 990 eng_procon .c. If the voltage drops too low an open door indication is sent to the BICU PCB but a signal is not sent to the IOB PCB which tells the machine which door is open.

Note: An older Drum more than 150,000 copies can also lead to SC 990 by causing incorrect ID Sensor readings

[Resolution]

1. Clean the internal contacts or replace Right Door Safety Switches (2 of Part Number 1204 2521 and 1 of Part Number 1204 2529)

Clean and vacuum the PCU.
Clean the Toner Shield Glass, Charge Roller and ID Sensor.
Check Service history for Drum Life, if over 150,000 replace Drum (Part Number A230 9510)
Reset SP 2103 -1 thru 4 to defaults.(LD Power Adjustments)
Reset SP 2001-1 to its default. (Charge Roller Bias Adjustment)
Execute SP 3001- 2 (ID Sensor Initial Setting)

Sep 02, 2011 | Ricoh Aficio 2035 Copier

2 Answers

Hi: We purchased a Schumacher SE-4022, (very similar to the DSR ProSeries only 200/100/40/10/2 amp, manual operation). It worked great for the 1st few months & now it has no amp output indicated on any...


I'm working on one right now. Not sure if it's the SE-4022 but the ratings are the same. 200/100/40/10/2 Amps. The rectifier diodes exploded in it. ie: Big bang, and smoke. Smoke is never a good thing. Pulled it apart. The diodes are press fit like a lot of car alternators. The number on the diodes is DT B7504A XXXX (Last four digits are a date code. Not important.) The diodes are made by DioTec BUT, they don't sell "retail". They supply manufacturing. I talked to DT's top guy and he told me to get the NTE5934 diodes from Newark Electronics. (Google it if you're not familiar with them.) Present price is $5.24 each. (ie: Cheap.)You have to press the old ones out and press the new ones in. I removed the aluminum plate from the unit and pressed out the old ones with my drill press. Put a deep socket (3/4") under the blown diode sitting on the drill table. Tighten the chuck so the nose is closed and sticking out. Push out diode with the nose of the chuck. Pressing the new ones in is more tricky. Keep the 3/4" socket under the plate. You then want a DEEP socket big enough to just press on the metal around the perimeter of the new diodes. BUT NOT TOUCH the insulator/pin part. You should be able to use the chuck nose against the back of the socket to push the new diodes in. I suggest using some heat sink compound or dielectric grease on the diode before pressing it in. Helps prevent corrosion between the metal plate and diode. THE DIODE HAS TO BE VERY TIGHT IN THE PLATE WHEN PRESSED IN. If it's loose at all, it won't transfer heat to the plate, the diode will overheat, and do pretty much the same as it's predecessor. If the diode(s) are loose after you install them, press them out again, and see if you can "close" the hole up a bit. Suggestion: put the plate on a flat metal surface (back of vise?) with the "flare" of metal facing up. Tap on that flare with a hammer that has a large enough head to hit the whole flare at once. Don't do too much. Try the diode again. Still too lose? Remove and tap again with hammer. Pain in the **** I know, but it's the only way I can see to get the diodes tight. DON'T use epoxy or "glue" in place of tightening the metal. The glue won't transfer the heat. As long as there is nothing else wrong with the charger, this will cost less than $15.00 plus your time. A lot cheaper than buying a new charger.

Aug 26, 2011 | Schumacher DSR ProSeries Battery Charger -...

1 Answer

I need sceaic diagram for sony KV-29MF8. The horizonl outot is always getig shorted?


CAuses and soultion:
1) Duplicate H Out transistor
2) Check whether the H Out is a DF or AF. If it is a DF (With diode inside) an AF wont work
3) Disconnect the H Out and connect a 100 W bulb on the collector and ground. The multimeter reading should not exceed 120V. If it is more then check powersupply components especially the transistors and diodes.
4) If the power supply voltage is fine then the problem exists with the horizontal output section. Check the yoke for short ckt or the EHT transformer.

Dec 22, 2010 | Televison & Video

2 Answers

Switches on then goes back to standby mode.initially it would show a the picture pressed vertically


problem on three things.
1.power supply: some of components may be damage,such as,EHT transformer ,Capacitor,diode Mos fat ,
2. Video card
3. If it self check thoroughly or not go to work shop.

Feb 12, 2010 | LG RU-27FB30C TV

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