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hp_9100 [2018/09/07 19:05]
cic [Repair]
hp_9100 [2018/09/07 19:09] (current)
cic
Line 27: Line 27:
 <​imgcaption CR| Replacement CR1 vs Failed Original(red) >​{{:​9100:​9100_repair:​baddiode.jpg?​400|}}</​imgcaption>​ <​imgcaption CR| Replacement CR1 vs Failed Original(red) >​{{:​9100:​9100_repair:​baddiode.jpg?​400|}}</​imgcaption>​
  
-Replacing these two components produced good CRT output and a largely functional machine. ​Final step at this stage was to replace the two register illumination bulbs, which are CML 7382. Note that these are 14V bulbs being driven at 15V, pretty strange for HP, which is more likely to under-drive components. I'm looking for an 18V replacent to lower the heat output and increase longevity.+Replacing these two components produced good CRT output and a largely functional machine. ​The final step at this stage was to replace the two register illumination bulbs, which are CML 7382. Note that these are 14V bulbs being driven at 15V, pretty strange for HP, which is more likely to under-drive components. I'm looking for an 18V replacent to lower the heat output and increase longevity.
  
 At this point, I was able to begin functional testing. I was able to work through the validation steps in the User Manual and Repair Manual successfully with only two problems - the "​8"​ key didn't work and the Degree/​Radian switch feels gummy and works inconsistently. Contact cleaner, gentle massage and burnishing of the key contacts with a narrow strip of bond paper solved these problems. ​ At this point, I was able to begin functional testing. I was able to work through the validation steps in the User Manual and Repair Manual successfully with only two problems - the "​8"​ key didn't work and the Degree/​Radian switch feels gummy and works inconsistently. Contact cleaner, gentle massage and burnishing of the key contacts with a narrow strip of bond paper solved these problems. ​
hp_9100.txt · Last modified: 2018/09/07 19:09 by cic