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.
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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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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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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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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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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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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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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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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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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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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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...Last edited by Nevillet; 07-09-2023, 10:52 AM.
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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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Re: Marantz PM34 amplifier repair advise
Many thanks Pete
In my original question I attached the SM.
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Re: Marantz PM34 amplifier repair advise
would turning them down be anticlockwise?
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Re: Marantz PM34 amplifier repair advise
I've checked the caps mentioned and they all measure fine (using a Peak ESR70)
Powering the amp via a variac and monitoring the current leaving the transformer and supplying the PCB the current is about 400mA on both side when the variac o/p is about 25V.
If I remove the 3 transitors and repeat the above test is only draws 20mA at 25V.
Any ideas?
...
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Marantz PM34 amplifier repair advise
Hi All,
I have a Denon PM34 HiFi amplifier that presented with no output on the right channel.
On examination the main drive Darlington transistor pair was faulty together with a smaller NPN driving them.
I've obtained the matching transistors but have not soldered them in place and would like some advise before I do:
The faulty componants are:
Q762 2SD1894 Darlington NPN
Q764 2SB1254 Darlington PNP
Q752 2SC3419 NPN
My question is why did they blow in the first place and are there any componants I should...
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Square wave (from a function generator) Vs a pulse generator
Hi All,
Can someone please explain the difference between a 1kH square waveform with a 50% duty cycle and a similar waveform from a pulse generator?
Many thanks,
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