The A1534 is the HV Supply board that is inserted into our SY1527(MTD:SY4527 ).

Currently used boards(03/01/2016) for TOF + MTD: serial number and firmware version

TOF(counting from 0):
slot 1(-): 54, 3.01
slot 3(+): 56, 2.02
slot 5(-): 55, 2.02
slot 7(+): 57, 2.02

MTD(counting from 0):
slot 1(-): 66, 04.
slot 3(+): 69, 3.01
slot 5(-): 71, 04.
slot 7(+): 61, 03.
slot 9(-): 59, 3.01

Spare(-): serial number 58

Bad boards:
#59(Neg) - channel 3 bad (ch. 0-5) [occurred ~2/5/16 in SY4527 while in slot 1, was replaced with #66 on 2/17/16, then reinstalled in slot 9]

#66(Neg) - channel 3 bad (ch. 0-5) [occurred ~6/16/15 in SY1527LC spare while in slot 5, then installed and bl30,1 no data but reading back values when in slot 1 in 02/17/16]
-Email thread MTD BL 15-17 HV on MTDops 6/22-6/26/15.
-Not sure if this board was repaired between run15+16 and then failed again.

Spare:
#58(Neg) - possible bad channel 3 (ch.0-5). I think this was swapped in for #66 ~6/16/15(spare SY1257LC) and out for #71 ~2/02/16 (SY4527). Would have been in slot 5
Unaware of the positive spares available.

BTW: reoccurring issues on MTD BL15-17 from at least 1/17/2015 [slot 5 channel 3] and 5/11/2014, 1/31/2014...

Also some board repair history:

Forum: TOF sub-system forum
Re: HV boards in need for repair (Bertrand H.J. Biritz)
Date: 2010, Jul 27
From: W.J. Llope

Hi Bertrand, since there are so many bad boards now - Geary and I agree that we
should probably send them all in together a.s.a.p...

thanks, cheers,
bill

On Jul 26, 2010, at 7:34 PM, Bertrand H.J. Biritz wrote:

> Hi All,
>
> Just wanted to open the discussion on how to proceed with the HV board repairs.
>
> In total there are three boards in need of repair, with board 54 already having been sent in:
>
> Board 54: Channel 0 is arching [In use and fixed for TOF. Would explain the updated firmware.-joey ]
>
> Board 58: Channel 0 has ~130V offset and channel 3 no longer works [Could be a reoccurring issue with channel 3...?or explain why it failed, if it was the one swapped above-joey]
>
> Board 56: Channel 5 no longer works [In use on TOF--repaired.-joey]
>
> Board 58 is powering the East negative side of TOF (and MTD) while board 56 is for the East positive side of TOF (and MTD). We no longer have enough spares to make up for the lose of these boards.
>
> During last weeks TOF phone conference Geary said board 58 should be sent in for repair once the last noise rate data run was taken.
> Does the fact that an additional board is in need of repair change this and should board 56 be sent in at the same time as well?
>
> CAEN will be entering their three week summer holiday beginning of August. My unfounded guesstimation for getting the boards back is end of September at the earliest.
>
> Bertrand
>
>
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