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News: In order for you to be able to post a new thread in the "For Sale" board, you need at least 10 posts in the rest of the forum, however you'll be able to reply to any topic in the forum even if you dont have the 10 post count. Any posts in the "For Sale" board will not appear in your total post counter.

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Dualflip

+  MCI Console and Tape Machine Forum
|-+  MCI Tape Machines
| |-+  JH-110 (Moderator: brianroth)
| | |-+  Rewind Slows to a Crawl!
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Author Topic: Rewind Slows to a Crawl!  (Read 48 times)
slorinczi
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« on: December 03, 2017, 01:27:39 PM »

I understand, sadly, that this forum will be disappearing shortly. Couldn't be sorrier to read that, and I'm grateful for all the support I've received here. Perhaps I can sneak one last question in under the wire?

My JH-110b has been mostly trouble-free, but now I'm noticing that near the end of a full-reel rewind, the speed slows. If I stop and then attempt to restart the rewind near the (heavy) end of the reel, the supply side has a good deal of trouble getting up to speed.

I have the manual, and also followed Brian's advice:

"1. Adjust the offset nulls.

2. Adjust the Idle pots.

3. I forget the name of the third set of tweaker pots but they set the play tension. Find the ones NOT labelled Idle or Offset. FF a 10" roll of tape to approx. midpoint (equal amounts of tape on both reels). Go into Play, and adjust the left hand pot so that the "dancer arm" (located near the left hand roller) is approx. midway in position. Then while in Play mode, manually push the pinch roller away from the capstan and adjust the right hand pot so that the tape still runs at approx. the correct speed."

But the issue persists. Scanning other threads, I see this in reference to a 1" 8-track model:

"1. Screw the one revolution every three seconds. Pull the brake solenoid driver to ensure no reel motion. Adjust TP1 and 2 (idle) for 1V each side. This is Steve's method and it works great."

Would this address my issue? I haven't yet done the #1 MCI "fix" (pull and reseat all boards), I suppose I should start there. That said, all red sockets are long gone, all pins on the motherboard have been resoldered.
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Luddite
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« Reply #1 on: December 03, 2017, 04:01:32 PM »

I thought the forum was remaining open after the earlier risk of closure?

In any event, I have found that bad electrolytics -- invisible, untestable problems, can cause such transport woes.  No big deal to replace them all.
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slorinczi
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« Reply #2 on: December 07, 2017, 07:12:59 PM »

Hm. I'll recheck, but pretty sure every electrolytic in this thing has been replaced by now!
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