amplifier repair | Electronics Repair And Technology News

Kenwood Amplifier Model KAC-629S – Dead but Now Repaired!

Jestine Yong — Sat, 04 Oct 2025 02:13:51 +0000

I recently received a Kenwood amplifier (model KAC-629S) that was completely dead. The owner mentioned that another technician had already looked at it and replaced a blown 25A fuse. The amplifier worked for a few days before failing again. Now, whenever a fuse blows, it’s usually a sign that something else is wrong. The fuse […]

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Revisit Of MARANTZ PM75 Amplifier With Different Problems

Jestine Yong — Sun, 07 Sep 2025 08:22:46 +0000

I request you all to see this link, in which I had reported about the first visit of this complicated, crudely designed amplifier with a hell of a lot of interconnecting wires. https://jestineyong.com/multiple-problems-solved-in-this-marantz-integrated-amplifier-model-pm-75/ I am including only the images relevant to the problem handled. Though I had told the customer […]

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Crackling Noise In TEAC Amplifier Model AS-100 Solved

Jestine Yong — Sat, 30 Aug 2025 07:58:17 +0000

This was one among the three antique sets brought by a new customer from a faraway distance, as a result of mouth-tomouth publicity! The complaint reported was that the left channel of the Amp was having loud crackling noises even at minimum volume, which I confirmed on checking. But I found mild noises in the […]

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Dead Battery And Bulgy Cap Replaced In BOAT PARTYPAL60 Portable Amplispeaker

Jestine Yong — Sat, 02 Aug 2025 08:04:39 +0000

This was brought by a customer, to whom I had serviced and given a Sony 5.1 Speaker System long back. The complaint reported was that the charger port was not working and it has been spoiled by many people handling it for use in parties! Since Christmas was at the doors, […]

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Simple Jobs In Two Amplifiers – JBL Libra 250 & Sonance Sonamp 260X3

Jestine Yong — Sat, 26 Jul 2025 09:18:50 +0000

Occasionally we get blessings of simple problems in sets and these two were such, which interestingly came from two different customers on successive days. Both Amplifiers were of international repute and that is why I chose to send this report to you all: Case (1) – JBL PUBLIC ADDRESS SYSTEM […]

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This Lovely Locally Assembled Amplifier Had Only A Minor Problem

Jestine Yong — Sat, 12 Jul 2025 06:15:36 +0000

This amplifier was brought by a customer as per recommendation of another. The complaint was that the Sub-woofer was not working and one channel of the 5.1 Surround speaker systems was not working. I made preliminary enquiries about the speakers used and advised the customer to check each and every one […]

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Crackling Noise In Realistic Receiver Amplifier Model STA78 Solved

Jestine Yong — Sat, 07 Jun 2025 01:49:20 +0000

This lovely receiver amplifier was brought to me with the complaint that loud unbearable crackling noise was heard on switch on. I opened the cover and cleaned the inside thoroughly and downloaded the service manual from website. As the Amp was having this problem even at minimum volume, the problem definitely […]

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Multiple Problems Solved In This Marantz Integrated Amplifier Model PM-75

Jestine Yong — Sun, 12 Jan 2025 09:33:43 +0000

This set was brought to me by a regular customer reporting that it suddenly stopped working and no control in the front panel worked. After my usual practice of opening and cleaning inside thoroughly, I brought it to my service table, struggling a bit because of its heavy weight. I […]

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Modification Of DB Meter In Technics Receiver Amplifier Model SA380S

Jestine Yong — Sat, 28 Dec 2024 08:28:42 +0000

This set had visited me a few months back and I had posted my report and I request the readers to see the article using the following link, before reading further: https://jestineyong.com/restoration-of-a-badly-tampered-technics-cassette-deck-receiver-amp-model-sa380s/ This time, the customer brought it in for two purposes: Firstly to modify the DB Meters so […]

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Intermittent On/Off Problem Solved In YAMAHA RX-V485 Receiver Amplifier

Jestine Yong — Sat, 02 Dec 2023 02:44:26 +0000

This set was brought to me by my school classmate with the complaint that it was intermittently going on/off. Though I had directed him to take it to another technician in town, due to overload of work with me, it was lying with him for many months as he could not solve the problem. That’s […]

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