wow such minor damage and those heads are dead ? I suppose those are holes, not bumps? otherwise insisting with a cotton swab and alcohol those bumps could go away.
ok thanks I’ll check those resitances.
I"ll try to find a good magnifier.
there is a gap in the middle of the head, the read heads are on the right side of this gap (9x digital at the upper part and 2x wide analog at the bottom part) and 9x write heads on the left side of the gap at the upper part.
My guess that we almost should not see this gap if the head is new and good. If we see some black lines (9+2) which are corresponds to the heads that is already either a hard dirt from the used tapes or a corrosion of this gap and heads.
Normally should not be like that because the surface of the head must be covered with the protection coating. seems this coating was really bad otherwise we than discussing the recommendation do not use of the ACCs in this forum :-(.
That is why (I mentioned that once) it will be good to have a picture of the brand-new head under the microscope to get a full picture how it should be.
Unfortunately, I sold out the working device, before I got the microscope.
I think I have found something. when I recapped this R/W board, The C111 had moved because of the heat, it’s the nearest to the bad capacitors. so I had to put it back on its place and heat again. and this C111… is on the track 7 no ?! so I think I can check it, and compare it with C110 which is I guess, same resistance.
or its track 8 that is faulty 0000000F. anyway, I ll check all resistances everywhere.
C111 is the capacitor in the line for track#8 (called playback MRH7 on the scheme, 1st track is MRH0).
you should try to fix and see if that will help.
ok interesting, that can be the problem I guess. I ll try to find another 50 V 1 uF and… solder it without moving its neighbours.
update : “0L” on this capacitor c111, whereas the other are 1,2 uF. so will replace it and see
I just bought another DCC 900 from Ukraine. 214 dollar. not working, no sound, cosmetically perfect and mechanically OK (Fforward, read, rewind, ok)
so I put the good W/R board from my 1st DCC (with the permanent error 00 0000000F) in this second DCC… and bingo : now this one works perfectly too and with the same error ! —> 00 0000000F
so I suppose I’m lucky because the two DCC have good heads, and the error is from the bad small smd on the w/r board
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Most probably yes. It is a good luck.