Good evening I need help in identifying this encoder, the volume only works at maximum
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Re: Hertz HP1D car amplifier
It is an audio taper 50k, are you sure it is bad? check the resistance. It might be similar to the Bourns PTV112
In the picture IC105 looks odd? is it just the picture or is the ic damaged?Last edited by R_J; 05-06-2020, 10:05 PM. -
Re: Hertz HP1D car amplifier
Oh yes its damaged i Will take a pics with micro ASAP .. thank youLast edited by lordgeny; 05-07-2020, 05:26 AM.Comment
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Re: Hertz HP1D car amplifier
Looking at microscope i found , its flux residue or resine , remove it , the chip its okComment
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Re: Hertz HP1D car amplifier
its the PTV112-4420A-A503Comment
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Hi all,
I'm currently working on a BMW OEM amplifier, part number 9 264 953, taken from a 2011 BMW F10 535i.
There's visible PCB damage near the NXP 74HCT193 chip, where a small SMD component is missing or burned. Based on shape and size, it's most likely a ceramic capacitor or resistor in 0603 package.
I recovered the loose component (appears unmarked, like a ceramic cap) and have detailed photos:
– PCB with missing part
– Close-up of recovered component
– Full view of the board
I'm looking for:
- The correct part... -
My childhood best friend was killed about 9 years ago. His parents are finally letting go of his things, and they offered me his Polk RTi100 tower speakers. The Polk RTi100 towers are one of a handful of designs from the early 2000s that is a full range 3-way tower with a built-in self-powered subwoofer. This is accomplished with a plate amp integrated into the speaker input panel.
I think they used them for a while, but they've been sitting for at least a few years now. After about 40 hours of driving to their house and back (both they and I have moved in the last 9 years) I got... -
Hi Folks
Need some advice on how to test a subwoofer amplifier if i have access to only a multimeter.
Problem
I have a Boston Acoustics active Subwoofer (soundware S). Its rated output is 200W. But the output i am getting is very low i can barely hear/feel it even if put the gain at max. I replaced all the capacitors in the Subwoofer amplifier but still no change.
Is there anyway to test this without getting an oscilloscope/Function generator to see if the fault is with amplifier, driver or the source??
Any advice would be appreciated... -
Hi, people.
I've got an amplifier assembly from Mackie CR4 parts. It's just an amplifier, there was no speaker housing, so I used my set of CR4s to test it.
Anyway, upon connecting everything and hooking the "new" amplifier to an audio source, the sound played clearly and strongly for the first ten seconds. I was happy it was working. Then the sound started to fade out during the playback until it was no more. After it had "dropped to zero", there were two very short intervals of sound playing at the normal volume, as if the amplifier was trying to... -
Hi all forum members,
Fyi, i have been working on this old model PCT-4082 (4 channel car amplifier). The owner said only one channel is working.
My initial finding is this amp originally use Toshiba 2SA1943 and 2SC5200 transistor for its output but after opening the top casing i found it used Toshiba A1941 (pnp)and C5198(npn). I desoldered all the 4 pairs transistors and found 1 piece A1941 open(tested "OL" on all legs) and replaced the 1st pair with 2SA1943 and 2SC5200, thats why you can see in the picture it is the bigger size transistor. The other A1941 and C5198 all...
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