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Forum Free Registration Closed
Granada Television Brochure, 1970s
Long Gone UK TV Shops
Memories of a Derwent Field Service Engineer
PYE Australia Circa 1971
Radios-TV VRAT
Fabulous Fablon
Thorn TX10 Chassis
Crusty-TV Museum, Analogue TV Network
Philips N1500 Warning!
Rumbelows
Thorn EMI Advertising
Thorn’s Guide to Servicing a VCR
Ferguson 3V24 De-Robed
Want to tell us a story?
Video Circuits V15 – Tripler Tester
Thorn Chassis Guide
Remove Teletext Lines & VCR Problems
Ceefax (Teletext)
Suggestions
Website Refresh
Colour TV Brochures
1970s Lounge Recreation
CrustyTV Vintage Television Museum
Linda Lovelace Experience
Humbars on a Sony KV2702
1972 Ultra 6713
D|E|R Service “The Best”
The one that got away
Technical information
The Line Output Stage
The map
Tales of a newly qualified young engineer.
Tales of a Radio Rentals Van Boy
Sanyo SMD
Disastrous Company Rebranding
1969 Philips G22K511
Memories Of The TV Trade
Crazy house
Dirty TV screens
Dual Standard and Single Standard CTV’s
Radios-TV on YouTube
The Winter of 62/63
A domestic audio installation
1979 Ferguson Videostar Deluxe 3V16
Music centre modifications
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1971 Beovision 3200
Hi-Fi Technics SL-1200 MK2 repair.
Hello all,
After many years of inactivity, I dusted off my 1200's that I used to use when DJing out on the road.
I was wondering if the group would be interested in hearing about the repairs and modifications?
Technical data is not an issue as I still have the original paper manual 🙂
What say ye?
All the best,
Tony
Standards are like toothbrushes. Everybody needs them, but nobody want to use yours!
Go for it Tony, it'll be a pleasant change for folk👍
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Yep, I'd certainly be interested to hear about it!
I certainly would also be interested as these were rare visitors to the workshop.
Rich
Agreed.... it would be an interesting read.
I use an SL1800 deck.....
To understand the black art of electronics is to understand witchcraft. Andrew.
Hello all,
Looks like I'd better get started 🙂
So after probably 20 years stored away in various facilities and garages, I opened one of my flight cases and there was a bit of green mouldy dust, which was taken care of with a vacuum cleaner, some diluted bleach and a rag to dry off.
The most common problems I used to find were the stylus lamp blowing, the pitch control getting erratic, the phono leads failing and the mains transformers buzzing.
Now I changed my phono leads yonks ago for something far more robust, so they're OK.
Time has taken it's toll on the transformer, however which now audibly buzzes and is especially noticable when the stylus is placed on a still record.
The special lamp is blown.... Quelle surprise!
Oh, and the pitch control centre detent contacts are erratically losing connection, so frequency lock comes and goes. The pitch control slider has a centre detent with shorting contacts that tells the control IC to only listen to it's own fixed quartz controlled oscillator, instead of the variable RC oscillator. One of the bugbears for many DJ's was that the speed would quartz lock a little before (and after) the centre detent was reached. This hysterisis would mean that beatmatching would be impossible in some cases, unless the other deck's pitch control was moved also. This I found out many times for myself on gigs!
Nowadays there are versions of the pitch control where the contacts are much more tightly aligned to the detent. Indeed, later versions of the SL-1200 had specific "Reset" switches to quartz lock to 33 or 45 RPM and pitch sliders with no detents.
The bearings could do with a bit cleaning and lubrication as well.
So the list on this 1st deck goes something like this :-
Build external power supply.
Fit new lamp.
Fit new pitch control and set up centre frequency and pitch gain to get +-8% pitch swing..... Harder than the manual says, by the way!
Clean and relubricate bearings.
Fit original platter mats and upgrade cartridges.
BTW my decks were retrofitted with "Beatkeeper" interfaces that plugged into a box that gave a digital readout of two decks' pitch settings/BPM values. The system was a forerunner of what is commonplace now on mixing CD, HDD and software players.
I wish I could remember what the system was called..... It was absolutely brilliant at setting up decks consistently!
Anyway, I'll get to work...... @Doz, I'll have to see how the VTA will work out on this deck. It hasn't been changed for maybe 25 years!
Standards are like toothbrushes. Everybody needs them, but nobody want to use yours!
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