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Azimuth adjustment on sony cassette recorders

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rotovator

(A)

Hello. I'm asking for technical help on a cassette recorder.

My last adquisition is an old Sony TC-K555 ES II. It is a very good recorder. But its playback capabilities are now not as good.
I would like to adjust its azimuth. But the head block has three screws, of which, two have springs around them. I haven't the manual and I am not sure which should I try to use to adjust azimuth.
I'm asking those who are familiar with sony head block mechanism. My sony tc-KA6ES has similar layout. I've made some pics.
You can see the deck here (there are TWO photos, scroll down to see the second)
http://webs.ono.com/llagona/fotos/azimuth.html

Many Many thanks

http://webs.ono.com/llagona/fotos/azimuth.html (Open in New Window)

Follow Ups:

Don't try adjusting with the meters on the deck - oldglide 21:37:24 02/13/07 (1)
#1-erase head mounting, fixed, no adjustment. #2-Rec head azimuth. #3-play head azimuth. #5-zenith, only on a Sony. Adjustment to make sure head is perpendicular, 90 degrees to the tape. Don't try to make these adjustments without a dual channel meter or a Nak T100. The meters on the deck do not have enough resolution. The adjustment procedure is tricky. Play head azimuth first, rec head next. Don't adjust the zenith unless you don't get equal output. Good luck.
- Many thanks and.. - rotovator 00:05:34 02/14/07 (0)
  I use a Computer based oscilloscope to match both channels phase. The pc samples at 96Khz
  I use a set of two prerecorded tapes.
  These two prerecorded tapes (one is "Dire straits - Brothers in ARms", the other is a spanish singer ) are not exactely same aligned. The highs sounds that reveal the precise phase misalignment, are not always present as would be in a test tape and wow and flutter can introduce some phase disadjustment. So I take my time alternating between these two tapes until the phase seems matched on both tapes, most of the times the highs are present.
  
  Yes, I know. I have to obtain one of those basf or nakamichi alginment tapes.
  It's not orthodox, but, belive me I leave the heads aligned.
  
  Then I confirm it with other tapes recorded by me on other decks with tests tones.
  THANKS again.
  Nacho
without any confidence whatsoever, I think number 2 is the correct screw - danny kaey 17:16:23 02/13/07 (0)
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