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Author Topic: Int'mt 'relay' click on Capstan servo bd. (MX5050BII2)  (Read 2652 times)

Offline ed

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Int'mt 'relay' click on Capstan servo bd. (MX5050BII2)
« on: February 20, 2012, 08:44:34 pm »
When raising the tension level, there's a relay (or??) that sometimes double-clicks and other times (most often) won't click. The cap. motor will not always start spinning. With a manual boost (twist w/fingers) it will. THIS is what I'm trying to remedy.
It's been oiled 'externally' and it slightly noisy - mechanically speaking.

(For clarity, here's my nomenclature - speed RANGE is selected in back; sp. MODE selected in front. It may be backwards from 'factory' ?? but here's what I'm talking today.)

It seem the relay(s) (or ??) double-clicks - actually it sounds like two relays ONLY in this specific transition, every time I move the switch from Hi to Low on FRONT. No clicking when moving from Lo to Hi. And it doesn't matter if it's in Lo RANGE or Hi. (The NAB indicator LED suddenly works no more...)

On my 2nd. machine (same 5050BII2) the relays click with every lifting of the tension are EXCEPT at 15ips. Then again it clicks when taken from Hi sp. to Lo sp. regardless of sp. RANGE- but ONLY if the cap. is spinning. SAME FOR troubled 1st. deck.  (NAB is fine, but deck won't REC or FF/RW - spools ok in PLAY - don't care: one deck at a time... ha-ha: X-7 sits in corner, BAD X-7 - BAD!!)

I've checked the PCB and re-soldiered several (~4) questionable spots (camera won't focus close enough for pix). No cracks found or anything else. Conn. cleaned, etc.

Thank you for any & all thoughts & helpful suggestions.

ed

Offline Listens2tubes

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Re: Int'mt 'relay' click on Capstan servo bd. (MX5050BII2)
« Reply #1 on: February 20, 2012, 10:16:00 pm »
Have you tried cleaning both speed switches? I found the board mounted back switch to really screw things up when only making partial contact.
Neal - Ampex Fineline F-44, 3 - Otari MX5050BII-2, Revox A77 Mk II , Teac A 4010s, 4070, Sony TC102A, Magnecord 1020, Systemdek IIX/Dynavector Karat 17D2MKII, CEC CD3300 CDP, K Works NanoMax DAC, Van Alsine Transcendence Eight+ tube preamp, Dynaco MkIV amp pair, Paradigm Reference Studio 100 v1

Offline ed

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Re: Int'mt 'relay' click on Capstan servo bd. (MX5050BII2)
« Reply #2 on: February 21, 2012, 01:17:11 am »
VERY well cleaned. AND exercised. Maybe it need to be exorcised ??

ed