LeCroy WS 434 runs in Simulation Mode as a WaveStation

[perdrix]

I'm trying to determine why XStream isn't recognising the main board on this 'scope.  Instead it is running in Demo mode as a WaveStation.

I'm currently working on the naive assumption that one of the EEPROMs may have lost its memory or maybe 27C26 which is a 4051 that selects which I²C device is being addressed is faulty.

The EEPROMs in question are:

• 27IC22 on the main board which is an AT24C32 I²C EEPROM, and
• IC8 on the back of the PCI board which is a DS2433S 1-Wire EEPROM

While I try to work out how to grab the contents of the DS2433S, does anyone know what these two EEPROMs should contain?  Why don't any EPROM burners handle the DS2433S?

Also if there's any other likely faults to look out for that would cause this, I'm very interested to hear.

PS I've checked the connectors between the PCI card and the main board.

PPS I'm going to check the power supply to confirm that all rails are present and correct.  I have met supplies that assert power good with one or more rails absent.

Thanks
David Partridge

[perdrix]

I've read the 24C32 EEPROM and its contents look like:

Code: [Select]

format-hex 27IC22.bin


           Path: C:\users\amonra\downloads\lecroy\WS 434\27IC22.bin

           00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000   41 41 63 71 42 74 64 53 79 73 74 65 6D 2A 2A 2A  AAcqBtdSystem***
00000010   01 2B 01 00 00 00 FF 00 7F 85 87 50 F7 6C 08 FF  .+......⌂…‡P÷l..
00000020   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
00000030   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
00000040   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
00000050   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
00000060   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
00000070   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
00000080   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
00000090   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
000000A0   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
000000B0   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
000000C0   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
000000D0   01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF 01 FF  ................
000000E0   01 FF 01 37 02 FF 01 CD 01 FF 01 16 02 FF 01 FB  ...7...Í.......û
000000F0   52 5F 7E 52 8B A6 4D 37 37 4E 56 75 3A 87 4D 1D  R_~R‹¦M77NVu:‡M.
00000100   37 C2 56 5F 3B D5 4C 5D 36 D7 4C CD 30 AE 4C 52  7ÂV_;ÕL]6×LÍ0®LR
00000110   36 90 4D 65 32 8D 00 85 48 83 40 83 6C 83 C6 89  6Me2.…Hƒ@ƒlƒÆ‰
00000120   A6 01 59 02 5F 02 AE 01 80 80 80 80 80 00 00 00  ¦.Y._.®.€€€€€...
00000130   00 00 00 00 00 00 00 00 00 00 00 00 00 18 53 65  ..............Se
00000140   72 69 61 6C 5F 4E 75 6D 62 65 72 2A 2A 2A 00 14  rial_Number***..
00000150   46 45 72 65 76 33 30 30 20 20 4D 41 49 4E 72 65  FErev300  MAINre
00000160   76 34 30 31 0E 44 73 6F 53 65 72 69 61 6C 4E 75  v401.DsoSerialNu
00000170   6D 62 65 72 2A 00 14 4C 43 52 59 30 33 30 31 4A  mber*..LCRY0301J
00000180   31 37 35 34 37 00 7C FF FF FF FF 00 41 41 63 71  17547.|.....AAcq
00000190   42 74 64 43 61 6C 2A 2A 2A 2A 2A 2A 00 A7 00 80  BtdCal******.§.€
000001A0   00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80  .€.€.€.€.€.€.€.€
000001B0   00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 00  .€.€.€.€.€.€.€..
000001C0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80  ...............€
000001D0   00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80  .€.€.€.€.€.€.€.€
000001E0   00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80  .€.€.€.€.€.€.€.€
000001F0   00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80  .€.€.€.€.€.€.€.€
00000200   00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80  .€.€.€.€.€.€.€.€
00000210   00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80  .€.€.€.€.€.€.€.€
00000220   00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80  .€.€.€.€.€.€.€.€
00000230   00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80  .€.€.€.€.€.€.€.€
00000240   00 80 00 80 00 80 45 4F 46 2A 2A 2A 2A 2A 2A 2A  .€.€.€EOF*******
00000250   2A 2A 2A 2A 2A 2A 00 01 00 00 7F 7F 7F 7F 7F 7F  ******....⌂⌂⌂⌂⌂⌂
00000260   7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F  ⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂
00000270   7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F  ⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂
00000280   7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F  ⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂
00000290   7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F  ⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂
000002A0   7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F  ⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂
000002B0   7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F  ⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂
000002C0   7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F  ⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂
000002D0   7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F  ⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂⌂
(I've truncated it there as the rest of the ROM content is all 7Fs)

That looks at the least fairly "sane" and the 'scope serial number in there is correct.

I also used an LA to capture the 1-Wire activity to the DS2433 on the back of the PCI card.

I'll attach that as its a fairly long CSV file - if you can reformat that as a ROM image...

I've no clue if the contents of that make sense or not

Does anyone out there know?

David

[perdrix]

I've reconstructed the contents of IC8 on the PCI card from the LA trace.

Code: [Select]

           Path: C:\users\amonra\Downloads\LeCroy\WS 434\ic8.bin

           00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000   F0 00 00 01 02 00 00 02 00 00 FF FF 00 00 42 38  ð.............B8
00000010   34 33 39 36 41 38 36 38 43 31 34 43 42 34 00 01  4396A868C14CB4..
00000020   37 41 34 32 41 34 46 39 30 35 46 42 35 35 33 33  7A42A4F905FB5533
00000030   00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000040   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000050   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000060   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000070   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000080   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000090   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000A0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000B0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000C0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000D0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000E0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000000F0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000100   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000110   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000120   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000130   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000140   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000150   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000160   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000170   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000180   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000190   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000001A0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000001B0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000001C0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000001D0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000001E0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
000001F0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
Feeding the values in there to the Validate tool says

Code: [Select]

C:\Unlock>python validate.py B843-96A8-68C1-4CB4 "X-STREAM options_8.0.1.2.cfg"
ScopeID: 41AE64
Flags:   01
Mask:    00000002
Options:
01-00000002 -L                   Long memory length option

C:\Unlock>python validate.py 7A42-A4F9-05FB-5533 "X-STREAM options_8.0.1.2.cfg"
ScopeID: 41AE64
Flags:   03
Mask:    00000008
Options:
03-00000008 MBW                  Medium bandwidth option

C:\Unlock>
And the ROM code matches:  ROM Code 0x00000041AE64

So it would seem that it is not corrupt.

[perdrix]

I hooked up the LA to 27IC22 (the I²C EEPROM on the main board).

Absolutely no activity at all even though I would have expected that to be the next thing the software looked after the options EEPROM on the PCI card.

Now to try to work out what might be wrong - there's quite a bit of "glue" logic between the PCI card and the EEPROM.

D.

[perdrix]

Here's the SimOptions Screen:


David

[tv84]

I think you need to have, at least, a copy of another LeCroy WS 434 mainboard EEPROM to make some comparisons.

Can you change those "Null" fields?

[amc184]

I have a Wave Surfer 434, and when I first got it I had a similar sounding issue.  On mine it would boot to Windows, start the X-Stream application, but then stop (I think there was a warning message, this was a while ago so I can't be more precise).  It would however recognise the scope hardware and start the application properly when restarted (okay for hot boot, no go for cold boot).

In my case it was a bad electrolytic capacitor issue, mainly the ones on the PC motherboard.  Mine was manufactured in mid-2004, so pretty well in the bad capacitors era, and quite a few of the motherboard capacitors were visually bad (domed, with dried discharge on the vents).  I replaced every electrolytic capacitor in the scope (both motherboard and scope hardware), and that resolved the issue.  The 434 has worked well since, and is still my main scope.

I'd consider doing something similar before digging much deeper, at least to the PC motherboard.  Have fun, it's a classic Japanese design that's a mess on many PCBs and cables - pretty awful to work on.

[perdrix]

Power supply in this case checks out AOK.

Some offline discussion led to my posting the SimInfo screen - changes you make there only change the Simulation mode (e.g. what 'scope is simulated).

An error log found under the Service mode Production/Error logs (or similar) led to an error log which could be printed:

Code: [Select]

0 12.15.2021  16:34:35 Informational System DSO starting... 6.8.1.4  (build 169683)
 1 12.15.2021  16:34:38 Warning HA_MAM633::HA_MAM633 Bad MAM All
 2 12.15.2021  16:34:39 Informational CAladdinAcquisitionDriver HW Not Found !!
 3 12.15.2021  16:34:54 Informational System DSO started Boot time = 27.530000 s

Which reports all MAMs (Monolithic Acquisition Memory hybrid ASICs) to be bad.  So definitely a fault on the main board.  Hard to believe ALL of those failed, so some other problem such they they aren't being clocked or something like that.

D.

[perdrix]

I had hoped that the problem was possibly something to do with the clock signals to the HAM631 hybrids.

I tacked a wire to pin 2 of 16IC13 (MC10H124M) but all was good there with an 83MHz signal (used to clock the RAM in the hybrids).

Same for the 500MHz signal leading to 15IC3 pin 89 (500MHz in), but that too was OK showing that the 2000MHz clock (16IC8 was running OK).

Next step is to check the signals from the timebase IC (16IC3) to the HAM631s (SCHK A, *SCHK A, SCHK B  etc.) are good.

David

[perdrix]

I couldn’t get to the lines for SCHK A etc. because the connections to the MAMs and the main timebase IC (16IC3) were under the components.

The clock signal (16MHz) from 16IC1 is good.

There was no signal at the 33MHz or *33MHz output pins of 28IC7 and 28IC11 respectively in the I/F Connector circuit (schematic 28 on the main board) at any stage during boot or X-Stream startup.
These are enabled by the Q output (CLK33 EN) signal from the main control board 27IC3.

Now, I don’t know that these clock signals aren’t used to check the MAMs, but I’m admit I’d be a bit surprised if they weren’t used …

Is there no-one out there who knows these main boards?

Thanks
David

[perdrix]

Hmmm… Pin 3 (which is the C input == *MB WR signal) of 27IC1 (74HCT138)  never goes low during X-Stream startup, so pin 13 (Y2) remains high (would need A=0, B=1, C=0) which doesn’t happen.   This output from the ‘138 is used as the clock input to the FF (27IC23)  that enables the 33MHz clock which is therefore not enabled.

So either the PCI card doesn’t try to write to the main board during startup (which seems slightly odd) or the main IC on the PCI card has bad output for pin T14 (nWR signal == *MB WR) which doesn’t seem very likely.

Is there really no-one out there who's done battle with these boards before (or knows how to find out what's wrong with them because they worked at Iwatsu or LeCroy?).


David