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Re: 11801 diagnostic help
Usually there are three parts in a NVRAM,
1.SRAM 2.DS1210(or DS121x?) 3. 3V battery This means we can make NVRAM by ourself, HM6116+DS1210+two 1.5V AAA batteries=DS1220Y(2Kx8 NVRAM) one 256K SRAM+DS1210+ one 3V battery(or two 1.5V AA batteries as an temporary solution)=DS1230Y=M48Z35Y 32kx8 NVRAM, couple years ago I made following NVRAM for tek 11A32,last week I replaced the HM6116 with a 256K SRAM and used it in CSA803(for a M48Z35Y=DS1230Y).it works well.by using larger capacity battery the life of data storage will be much much longer! you can see the picture of NVRAM I made. /g/HP-Agilent-Keysight-equipment/topic/nvram_28_pin_encapsulated/30699861?p=,,,100,0,0,0::recentpostdate%2Fsticky,,,100,2,0,30699861 |
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Repairability of SD-24, SD-30 & SD-32 sampling heads
Has anyone attempted to repair one? If so, what was the outcome? I'm familiar with the EPROM failure repair. I'm really asking about the input and output sections as they are ESD sensitive.
Are suitable parts available? I realize that there are no schematics or other information. Have Fun! Reg |
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Re: 11801 diagnostic help
I'd have had to wait for my ST replacement NVRAM without the assist from Tom Miller.
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Wherever did you find a DS1213? Digikey and Mouser don't have them. I doubt that any of the ones on eBay have good batteries. But you can see the outline of the tiny lithium cells potted on the underside, so a bit of Dremel work would allow fitting a larger pair of cells in holders in the unused DIP footprints in the left front corner of the board. The next issue is what data is stored in these? It's obviously not the RTC or anything else I can determine such as operating hours, serial number, etc. The only downside is now I need an SD-24 and an SD-32 ;-) -------------------------------------------- On Sun, 3/24/19, Jack2015 <tolkien@...> wrote:
Subject: Re: [TekScopes] 11801 diagnostic help To: [email protected] Date: Sunday, March 24, 2019, 8:02 PM Congrats!nice job. After replacing the DS1213 with a new NVRAM in my CSA803 (I? replaced one DS1213 only ) I rebooted it 3 times to get rid of the self test failure. 1st time:same err E5322 2nd time:Battery error,but can exit diagnostic and enter operational screen. subsys --------------block------------area------------routine Timebase? -----TBC control------ Static RAM -----Battery 3rd time:passed self test. |
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Re: 11801 diagnostic help
Congrats!nice job.
After replacing the DS1213 with a new NVRAM in my CSA803 (I replaced one DS1213 only ) I rebooted it 3 times to get rid of the self test failure. 1st time:same err E5322 2nd time:Battery error,but can exit diagnostic and enter operational screen. subsys --------------block------------area------------routine Timebase -----TBC control------ Static RAM -----Battery 3rd time:passed self test. |
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Re: 11801 diagnostic help
It booted!!!!
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It recognizes the two SD-22s, knows it is 24 March 2019 though the time is off by 2.5 hours. Two hours of which are Mountain time and the change in DST. It reports 43989 hours of on time and 2033 power ups of which I probably did the last few hundred. Thank you Tom! Reg -------------------------------------------- On Sun, 3/24/19, Tom Miller <tmiller11147@...> wrote:
Subject: Re: [TekScopes] 11801 diagnostic help To: [email protected] Date: Sunday, March 24, 2019, 6:20 PM Good point and that jogged a memory. Try pulling the ram chips out of the smartsocket and plugging them directly in. See if it will fully boot without the same error. |
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Re: 11801 diagnostic help
Good point and that jogged a memory. Try pulling the ram chips out of the smartsocket and plugging them directly in. See if it will fully boot without the same error.
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On 3/24/2019 2:47 PM, Albert Otten wrote:
Hi Reg, |
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Re: 11801 NVRAM
Those are *not* 11801 manuals. They are 11801C manuals. I currently have a PDF of the 11801 service manual courtesy of a member of the list and the 11801,11802 & SM11 diagnostics courtesy of TekWiki. I have paper copies of the 11801 user and service manuals in transit.
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-------------------------------------------- On Sun, 3/24/19, bobh@... <bobh@...> wrote:
Subject: Re: [TekScopes] 11801 NVRAM To: [email protected] Date: Sunday, March 24, 2019, 4:44 PM Re: ROM images, did you check here: Search ko4bb for 11801. Bob. On 3/24/2019 7:26 AM, Reginald Beardsley via Groups.Io wrote: > I was able to select a DS1230Y NVRAM package on the TNM5000 and read U500.? However, it only contained 32 bytes of data.? Everything else was alternating 32 bytes of 00 and FF. > > I should note that when I selected the NVRAM part, the TNM put up a warning to select the device before inserting the device in the ZIF which is the opposite of what I did. > > Does anyone have images of? U500 and U511 from a CSA803 or 11801 which has the factory cal data?? We'd also need the 200 MHz OXCO measured using a GPSDO referenced counter and the version of the timebase board ROMS.? Mine are version 10.1 dated 1991. > > Does anyone of the list know who designed the board?? It's dated 1988.? It they are still alive we might get some help from them. > > Is there any information on the recalibration process? > > This needs to be documented before all of them fail. Twenty odd years ago there was a detailed description of how to recover a Sun workstation from a failed NVRAM.? So if you bought a used system, one of the first things you did was record the serial number, etc for future reference. > > Reg > > > > |
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Re: 11801 diagnostic help
I'm reading the diagnostics manual section for the A5 timebase board. The 8 LEDs, ST0-7 come on at power on and stay on while it runs through the self tests I have J710- J713 set to 0. There is never any change in the brightness of the LEDs and all the diagnostics run until it stops with an E5622 error.
I'm somewhat at a loss with regard to the divergence between the manual and the actual behavior. There is evidence that the underside of the case got damp in the form of brownish discoloration of the external surfaces of the end frames and white powder at several points where the bottom cover touched the frames. However, there is no indication that the boards got wet. The discoloration is consistent with what I'd expect if it sat on a concrete slab for a long period of time in a non-climate controlled room. The unit came from Arizona. I have removed and reseated all the board connectors on the A5 board except for the coaxial lines. If the other end of the A5 cables was within reach I reseated the other end also. I've also reseated the 4 ROMS in unmarked sockets next to U501 and U511. The ROMs are marked U300, U310, U400 & U410 V10.1 1991. Instrument serial number is B030215. |
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Re: 11801 NVRAM
Re: ROM images, did you check here:
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Search ko4bb for 11801. Bob. On 3/24/2019 7:26 AM, Reginald Beardsley via Groups.Io wrote:
I was able to select a DS1230Y NVRAM package on the TNM5000 and read U500. However, it only contained 32 bytes of data. Everything else was alternating 32 bytes of 00 and FF. |
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Re: 11801 diagnostic help
Thanks. It got overlooked among the ridiculous number of 11801C manuals I found listed as 11801 manuals.
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Breaks over, back to work :-) -------------------------------------------- On Sun, 3/24/19, Albert Otten <aodiversen@...> wrote:
Subject: Re: [TekScopes] 11801 diagnostic help To: [email protected] Date: Sunday, March 24, 2019, 4:00 PM Hi Reg, I thought this manual had been mentioned before. I meant the last manual listed at tekwiki, . Also here: Albert On Sun, Mar 24, 2019 at 08:13 PM, Reginald Beardsley wrote: > > Albert, > > Where do I find a diagnostics manual for the 11801? > |
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Re: 11801 diagnostic help
Hi Reg,
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I thought this manual had been mentioned before. I meant the last manual listed at tekwiki, . Also here: Albert On Sun, Mar 24, 2019 at 08:13 PM, Reginald Beardsley wrote:
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Re: 577 Curve tracer ringing CRT and noisy step generator
They should be symmetrical, however checking a 577 that just came in I found U220 pin 9 is actually pin 13, guess you can't trust the gates in the manual :)
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probably some updates somewhere but I don't have them. On Fri, Mar 15, 2019 at 08:57 AM, <wilson2115@...> wrote:
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Re: 11801 diagnostic help
Albert,
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Where do I find a diagnostics manual for the 11801? Finding *any* manuals at all has been like looking for a unicorn. Days of searching turned up 11801A/B/C documents. But no 11801 documents. I still get an E5622 error after my misadventure with U511. In my view we really need to get this sorted out before a lot of very fine instruments become junk. Component level documentation for an 11801 would probably have sot $150-200K NRE at the time it was introduced.. Not providing that on a $25K (1989) instrument is obscene. Thanks for your help. Reg -------------------------------------------- On Sun, 3/24/19, Albert Otten <aodiversen@...> wrote:
Subject: Re: [TekScopes] 11801 diagnostic help To: [email protected] Date: Sunday, March 24, 2019, 1:47 PM Hi Reg, You moved the correct jumpers (Fig. 1-1 in the Diagnostics manual). I suppose (just suppose) now that the Exxxx error is too severe. When the battery in the Dallas battery is low, the NVRAM memory chip should still work but lose its content after power off. The corresponding error is T1331. Probably the chip inside the Dallas unit does not function properly anymore, i.e. does not guide the mainframe 5V to the memory chip when mainframe power is present. The scope should power up normally even without any plugins. Of course many function simply are not available then, but you can see things like instrument options and identification. Albert On Sun, Mar 24, 2019 at 04:48 PM, Reginald Beardsley wrote: > > Albert Otten wrote: > > Another possibility to have the instrument atleast doing something is to > bypass the Self test and > Extended Diagnostic tests by setting jumpers J712 and J713 on the I/O board to > the 0 position. These jumpers are difficult to reach with the board in situ, I > found it easier to remove the board and then change the jumper settings. > > The only jumper labeled was J710, so I assumed the number went up went up from > there.? J712 and J713 were set to the right, so I moved them to the left, > replaced the board and powered it up. > > There was no change in behavior. > > In reading the service manual for the 11801 it seemed to indicate that a > sampling head needed to be installed.? I tried it with one of my SD-22s > installed, but that had no discernible effect. > |
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Re: 2247A PSU Troubleshooting
All this talk of diodes may be relevant when you get the PSU to start but its dead right? The way I work on these is remove the PSU from the case, remove the IEC power inlet from the case and reconnect to the power supply so you have a safe(ish) power connection. Put the power supply on a suitable sized cardboard box with a slot cut in it to pass the output pins through and give you a stable PSU to work with. Disconnect and insulate the multiplier feed from T2204, that saves you any worry about the EHT and also removes the multiplier as a fault. Remove the fan from the case (you can get at the bolts without removing the tube). Plug the fan into the PSU as a load.
Now as I posted previously check C2210 (4.7uF 100v) either by measuring or substitution. Check Q2209 and Q2210 (TIP32C) out of circuit using your multimeter. This the usual cause of a non starting supply. Regarding the secondary diodes, if you really think they are suspect just lift one end, its rare that they will cause the supply to trip, maybe excess ripple on a rail. If the supply still fails to start check Q2214 (Mosfet) might be shorted. Just be careful! Think twice before touching anything with the power on. My 10 cents...........JC |
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Re: 11801 diagnostic help
Hi Reg,
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You moved the correct jumpers (Fig. 1-1 in the Diagnostics manual). I suppose (just suppose) now that the Exxxx error is too severe. When the battery in the Dallas battery is low, the NVRAM memory chip should still work but lose its content after power off. The corresponding error is T1331. Probably the chip inside the Dallas unit does not function properly anymore, i.e. does not guide the mainframe 5V to the memory chip when mainframe power is present. The scope should power up normally even without any plugins. Of course many function simply are not available then, but you can see things like instrument options and identification. Albert On Sun, Mar 24, 2019 at 04:48 PM, Reginald Beardsley wrote:
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Re: 11801 NVRAM
I have replacements made by ST in transit. As for exiting the Extended Diagnostics, my last post reported that I am not able to do that.
I have tried deleting the failing tests, but cannot. I have tried exiting diagnostics, but cannot. I have tried entering debug mode, but cannot. I have turned off "stop on error" but it has no effect. I tried changing the jumpers on J712 and J713, but that had no effect. I have tried installing both of the SD-22 heads, but that had no effect. I have no idea if the SD-22s are any good or not. The channel select LEDs flash on power up, but that is all. When I compare this instrument to my 485 and 465 it is sad to see how far Tek fell in a very short time. Reg |
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Complete P6450 Data Acquisition Probe NEW Unopened package
I have a brand new unopened complete P6450 Data Acquisition Probe including
all the multi-colored wires and mini-test clips. I can ship it anywhere in the US for $30. That includes shipping. If interested contact me OFF LIST at dennis at ridesoft dot com. Dennis Tillman W7PF |
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