Author: Provo Electronics

Parts and repair service for audio /studio HI-FI equipment. Mcintosh,Sansui, Kenwood, Fisher,Pioneer, Marantz, others HI-FI gears. Repair service for vintage audio gears. Audio HI-FI equipment repair and restoration service. Arcade games repair. Metal detector Minelab, Whites, Garrett repair , service. Seattle area.
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01/18/2025  .Unusual repair case #189674 . Marantz 2270 .  No AM band signal , no balance control.

01/18/2025  .Unusual repair case #189674 . Marantz 2270 .  No AM band signal , no balance control.

Unit after  full service in our shop. After customer pick up unit and tried to use it  – no AM ,  BALANCE  left/right not working. During service visit in customer home found – not original screws used for mounting wooden case . New screws what customer used for mounting wooden case on this unit a little longer then original and touching components inside. Difference in length was not big –  just 5-6 mm. , but it makes a big difference. Front screws for wooden case need to be same as original. Unexpected issue.

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Case  546650.   12/30/2024  Dewault 920 cordless screwdriver upgrade to Lithium battery.

We are not fixing audio today.  I upgrade my old friend Dewault 920  . This hard working  guy  was in service with me from 2010 .  Got good reputation and perfect resume .   As you know this tool works for electrical jobs and small projects and use not powerfull NI-MH battery  7,2 Volt.  After 5- 9  month  of work you have to buy new battery. In this case we will transfer  it to lithium 7.4 volt battery . We use two 18650 lithium elements in series. Gentle soldering requaired. Create new charge port and drop new batteries in old plastic shell .   DO NOT USE OLD CHARGER !!!!     It will damage new Lithium battery.

In my case i used simple audio RCA plug as charging port. Charger we will use 8.4 volt  1-2 Amp for lithium batteries only.   8.4 volt only with protection and current control . Will do update how my upgrade process  goes.