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Messages - Bobs_Bench2

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Reel to Reel Tape Machines / Re: Technics RS-1500 Repair Diary
« on: January 10, 2020, 07:22:31 PM »
I'm back!  It's been a long time since I last posted to this topic.  I finally have another installment to this repair diary.  I still have the same three Technics RS-1500 decks as before.  This time that pesky head block selector switch finally needed to be replaced on one of them.  It seemed to always need attention to keep it working but this time I discovered that the plastic stub that attaches the actuator to the switch was cracked and flexed during operation.

My fix was to replace the original slide switch with a more reliable toggle switch.  I used an NKK M2022SD3G01 (Mouser 633-M2022SD3G01).  I made a mounting plate from 1/16" thick flat extruded aluminum that mounts to the frame in the way the original switch was attached with the pair of 2mm screws.  A 1/4" hole centered on that plate is where the new switch mounts.  The dark plastic dress washer that slid back and forth with the old switch actuator fits over the end of the mounting bushing of the new toggle switch.

I had to unsolder some of the wires from the PCB to get access to extract the old switch and install the new.  Because of the way the toggle works relative to the old slide switch the 2-track/4-track connections had to be "reversed" so the toggle position would make sense as seen on the front of the head block.

The new switch looks pretty good from the front.  Too bad Technics didn't go with this kind of switch originally.

I can't be sure, but it seems like the sound of this machine has been improved with the new switch.  I suspect that there's a much better connection with the playback tape heads.

Bob Addiss

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