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HP 8594E new issue

 

Ok I replaced the battery this am and all went great, yes I did copy the info as the manual states.
my new issue is the display as you will see in this video. I thought maybe I missed a connection when I re-assembled so I took all apart and checked and nothing was disconnected or wrong.
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The Voltages look good according to the Power Supply indicator lights.
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D1 - D16 all lite when powered on and go off with the exception on D13 as I believe this is normal?
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Any suggestions would be appreciated.?
 

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Hi,

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I think you may have lost the calibration constants, at least the ones related to the display.

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You'll have to do a blind test.

The soft buttons near the screen, the top one is #1 and the bottom one is #6.

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CAL

MORE (soft button #6)

Soft button #4 for vertical adjustment

Soft button #5 for horizontal adjustment

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Use the knob or the up and down arrows to see if you can synchronize the image.

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Yves
 

All LEDs should go off once boot is complete and the initial hardware check is finished. ?D13 being left on indicates there is a problem with the 68230 (U57) Parallel Interface/Timer. ?See Table 14-3 in the Assembly Repair manual for LED decoding.
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It doesn't necessarily mean that U57 is bad; it could be something that's being tested that is connected to U57.
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I assume you had a normal display before you replaced the battery? ?Is the SRAM card completely seated?
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-mark
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On Thu, Apr 3, 2025 at 07:58 PM, KB2LMN wrote:

Ok I replaced the battery this am and all went great, yes I did copy the info as the manual states.
my new issue is the display as you will see in this video. I thought maybe I missed a connection when I re-assembled so I took all apart and checked and nothing was disconnected or wrong.
?
?
The Voltages look good according to the Power Supply indicator lights.
?
D1 - D16 all lite when powered on and go off with the exception on D13 as I believe this is normal?
?
Any suggestions would be appreciated.?
 

Mark yes the display was normal.
 

Mark I took the boards back out and cleaned all the contacts good and seeded them in and out a few times now the lite D13 is off. I do still have the screen issue shown in the video. I also tried what Yves suggested with no luck.
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Andrew
 

Odd that D13 would now be off.? We'll assume the 68230 and related circuitry is ok for the moment.
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Along the same lines as what Yves suggested, you could also try resetting the CRT to DEFAULT SYNC.? Flying blind, it would be:
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? CONFIG
? Softkey #6 (MORE)
? Softkey #6 (MORE)
? Softkey #3 (DEFAULT SYNC)
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You could also try setting DEFAULT CONFIG:
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? CONFIG
? Softkey #6 (MORE)
? Softkey #4 (DEFAULT CONFIG)
? Softkey #4 (DEFAULT CONFIG)? (second press needed to confirm)
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Another thought is to try resetting the contents of the SRAM completely by grounding the + side of the supercap through a 10 ohm resistor to ground and hold it there for about 10 seconds (obviously with the power off). ?You'll then have to go through the initialization procedure on page 204. ?I know you were trying to avoid doing that in the first place, but it seems the most likely explanation is that something got corrupted in the SRAM during the battery replacement procedure.
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-mark
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On Fri, Apr 4, 2025 at 10:37 AM, KB2LMN wrote:

Mark I took the boards back out and cleaned all the contacts good and seeded them in and out a few times now the lite D13 is off. I do still have the screen issue shown in the video. I also tried what Yves suggested with no luck.
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Andrew
 

Also, how is the voltage on your new battery?
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-mark
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6.3Vdc
 

Reset worked Config, 6, 6, 3.
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Thank you!!!!
 

Great, glad the sync reset worked!
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It makes me wonder, however, if the CRT parameters were corrupt in SRAM, then what else might be corrupt? ?I would take a quick pass through the calibration constants to verify they are still ok. ?And it wouldn't hurt to do a FREQ/AMPLITUDE self-cal when you get a chance.
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Really 6.3V on the battery?? ?It should be around 3.3V for a new battery.
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-mark
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On Fri, Apr 4, 2025 at 01:26 PM, KB2LMN wrote:

Reset worked Config, 6, 6, 3.
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Thank you!!!!

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