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Nevillet started a topic SMPS controller help

in Troubleshooting Power Supplies and Power Supply Design

11-01-2024, 10:41 AM
SMPS controller help

Hi All,

I'm trying to repair a PCB that controls a kitchen extractor hood. The PCB has a switching controller that appears faulty and I'm looking for an alternative – if possible.

The device is a through hole 7 pin DIP package named LN5R05C.
[URL]https://www.jotrin.com/product/parts/LN5R05C[/URL]

I'm hoping it can be replaced with a generic switch controller. My usual supplier has these:

[URL]https://cpc.farnell.com/w/c/electronic-electrical-components/semiconductors-ics/power-management/ac-dc-converters?ta_ic_case_package=DIP[/URL]...

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Last edited by Nevillet; 11-01-2024, 10:51 AM.
Nevillet replied to Identifying a TO220 device

in General Electronics Technical Discussion

07-31-2024, 07:34 AM
Many thanks for that. Best wishes,

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Nevillet started a topic Identifying a TO220 device

in General Electronics Technical Discussion

07-30-2024, 11:48 AM
Identifying a TO220 device

Hi All,

I'm trying to repair a swich mode PSU and have found a shorted TO220 device but cannot track it down.

The markings are:

First
15T43
FIR7N65AF

A picture is attached.

Many thanks....

1 Photo

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Nevillet replied to Identifying a 'FS45' SOT23 device

in General Electronics Technical Discussion

06-19-2024, 02:15 PM
That's great. Many thanks for your help.

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Nevillet started a topic Identifying a 'FS45' SOT23 device

in General Electronics Technical Discussion

06-19-2024, 11:42 AM
Identifying a 'FS45' SOT23 device

Hi All,

I'm trying to repair a PCB that has some surface mount SOT23 devices that apear to be transistors but testing them on the board are giving confusing results.

Its named FS45 but I can't find a datasheet that seems correct.

The device is used in 10 places on the PCB. In 4 cases they appear to be controling triacs and the attached picture it shows it connected to a BT136 triac with the FS45 connected to the gate leg of the BT136.

Can anyone identify the device and suggest an alternative?

Many thanks.

PS: I have...

5 Photos

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Last edited by Nevillet; 06-19-2024, 12:07 PM.
Nevillet started a topic Triac alternatives

in General Electronics Technical Discussion

02-17-2024, 11:30 AM
Triac alternatives

Hi All,

I'm trying to repair a coffee machine where the triac that controls the 240VAC water pump has failed and is latched on.

The water pump is controlled either on or off.

The triac is a surface mount BTA204S-800E. (datasheet attached)

I have a selection of other non surface mount triacs and need advise on selecting a substitute.

The triacs include BTA16, BT131, BTA208, BTA12, BT138, BTA06

Any help would be great.

Many thanks.

https://drive.google.com

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Nevillet replied to Identifying a 3-legged device

in General Electronics Technical Discussion

10-04-2023, 01:21 PM
Re: Identifying a 3-legged device

I replaced 2 caps on the primary side CD501&2 (22uF/400V). The ESR was very high on both. There was a flashover type skidmark on the solder side around the R5032 area. Although it looked ugly after a clean all the resistors and tracks measured OK.

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Nevillet started a topic Identifying a 3-legged device

in General Electronics Technical Discussion

10-04-2023, 04:50 AM
Identifying a 3-legged device

Hi All,

I have a small Sony CD player (CMT-X3CD) where the PSU board has died but i'm having trouble identifining a fried 3 legged component labled as Q501 on the schematic. The marking on the device itself is terrible and all I can decifer is:
25216
SMK

Can anyone suggest what it can be replaced with?

I've attached the service manual and the PSU board can be found on page 36/7.

Many thanks.
[url]https://www.badcaps.net/forum/attachment.php?attachmentid=313265&stc=1&d=1696416404[/url]

Hi All,...

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Nevillet replied to Panasonic SA-PM71SD Micro HiFi - not comming out of standby

in Troubleshooting Audio Equipment

08-25-2023, 06:43 AM
Re: Panasonic SA-PM71SD Micro HiFi - not comming out of standby

I agree it's a horrible design and they are painfull to work on. Saying that all the solder joints look OK and I've reflowed most on the power & amplifier boards but still no further forwards..

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Nevillet started a topic Panasonic SA-PM71SD Micro HiFi - not comming out of standby

in Troubleshooting Audio Equipment

08-24-2023, 10:58 AM
Panasonic SA-PM71SD Micro HiFi - not comming out of standby

Hi All,

I have the above mini HiFi that after powering displays the standby LED and when the power switch is pressed the relay momentarily clicks in then cuts out again.

I've included an image of the power board schematic.

There is 5.9V present on pin 4 of CN507 and when the standby button is pressed 2.6V momentarily appears on pin2 of the same connector.

Any thoughts would be welcome.

The service manual exceeds the Badcaps file size limit but it can be found here:...

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Nevillet replied to Sony CMT-SPZ90DB HiFi PSU Problem?

in Troubleshooting Audio Equipment

08-02-2023, 12:26 PM
Re: Sony CMT-SPZ90DB HiFi PSU Problem?

Hi all,

Just to report back on this one.
When the unit is powered up it goes through an initialisation sequence that first checks the CD player for disks in the 3 trays.
It then spins up the cassette deck, moves the heads in and out except they didn't and I noticed that two belts in the cassette deck were very slack so I replaced them.
After that the machine started working correctly...

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Nevillet replied to Sony CMT-SPZ90DB HiFi PSU Problem?

in Troubleshooting Audio Equipment

07-23-2023, 01:28 PM
Re: Sony CMT-SPZ90DB HiFi PSU Problem?

The 16 & 28V rails are stable and have minimal movement when the power button is pushed.

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Nevillet replied to Sony CMT-SPZ90DB HiFi PSU Problem?

in Troubleshooting Audio Equipment

07-21-2023, 04:18 AM
Re: Sony CMT-SPZ90DB HiFi PSU Problem?

I swapped C604, C25 & C654.

Their measurements off the board is below:

The 4V rail measured at CN604 (pin2) is 3.931V an it doesn't change when the power button is pressed.

...

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Nevillet replied to Sony CMT-SPZ90DB HiFi PSU Problem?

in Troubleshooting Audio Equipment

07-20-2023, 12:19 PM
Re: Sony CMT-SPZ90DB HiFi PSU Problem?

Thanks so much for your help. I'll get back to it tomorrow and report back.

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Nevillet started a topic Sony CMT-SPZ90DB HiFi PSU Problem?

in Troubleshooting Audio Equipment

07-20-2023, 11:33 AM
Sony CMT-SPZ90DB HiFi PSU Problem?

Hi All,

I'm trying to repair a Sony CMT-SPZ90DB compact HiFi that includes a 3-disk CD, cassette & tuner.

When it's plugged into power the red LED illuminates but when the Standby1/0 button is pressed it briefly starts up with CD & cassette motors starting but then goes back into standby.

The power board shows signs of heat and a picture is included as is the service manual.
I've been doing a quick check of a some componants in the PS board and came across D602 which is open circuit.
Off the board it's still reads o/c.
...

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Nevillet replied to Simple PIR sensor circuit to drive a small motor

in General Electronics Technical Discussion

07-10-2023, 10:52 AM
Re: Simple PIR sensor circuit to drive a small motor

I don't need the delay. Can I omit the cap?

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Nevillet replied to Simple PIR sensor circuit to drive a small motor

in General Electronics Technical Discussion

07-10-2023, 06:30 AM
Re: Simple PIR sensor circuit to drive a small motor

I have some TIP120's to hand. Would the circuit below work or would it require modification?

[URL="https://www.badcaps.net/forum/attachment.php?attachmentid=304819&stc=1&d=1688992175"]https://www.badcaps.net/forum/attachment.php?attachmentid=304819&stc=1&d=1688992175[/URL]Re: Simple PIR sensor circuit to drive a small motor

I have some TIP120's to hand. Would the circuit below work or would it require modification?

[URL="https://www.badcaps.net/forum/...

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Nevillet started a topic Simple PIR sensor circuit to drive a small motor

in General Electronics Technical Discussion

07-09-2023, 10:48 AM
Simple PIR sensor circuit to drive a small motor

Hi All,

I'd like some help designing a simple circuit for driving a small DC motor.
The PIR module is a HC-SR501 which runs on 6V supply and outputs 2.4V when triggered. (Datasheet attached)

I'm not totally sure which motor I need yet but lets assume it'll be 12V and draw a maximum of 100mA.

Can somebody design me a simple circuit for me using something like a 2N3904?

I'm happy to include a relay if that makes sense.

Many thanks.

[URL="https://www.badcaps.net/forum/attachment.php?att...

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Last edited by Nevillet; 07-09-2023, 10:52 AM.
Nevillet replied to Marantz PM34 amplifier repair advise

in Troubleshooting Audio Equipment

05-05-2023, 01:04 PM
Re: Marantz PM34 amplifier repair advise

I'm sorry I haven't been back due to pressure of work.

I will though...

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Nevillet replied to Marantz PM34 amplifier repair advise

in Troubleshooting Audio Equipment

04-28-2023, 10:16 AM
Re: Marantz PM34 amplifier repair advise

Many thanks Pete

In my original question I attached the SM.

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