comparison: content/hp8662a_2.rst
content/hp8662a_2.rst
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| 12 After fixing the PSU, several more problems needed to be addressed: | 12 After fixing the PSU, several more problems needed to be addressed: |
| 13 | 13 |
| 14 - a few sloppy keys on the keypad, | 14 - a few sloppy keys on the keypad, |
| 15 - the know did not work at all, | 15 - the know did not work at all, |
| 16 - and more importantly, some very unpleasant spectrums at some frequencies | 16 - and more importantly, some very unpleasant spectrums at some frequencies |
| 17 (covered in `part 3 <{filename}hp8662a_3.rst>`_), | 17 (covered in `part 3 <{static}hp8662a_3.rst>`_), |
| 18 - some output level accuracy problems. | 18 - some output level accuracy problems. |
| 19 | 19 |
| 20 | 20 |
| 21 Keypad | 21 Keypad |
| 22 ====== | 22 ====== |
| 24 The keypad was, as allways with HP devices from this period, very hard and | 24 The keypad was, as allways with HP devices from this period, very hard and |
| 25 "clunky" for most keys but 2. | 25 "clunky" for most keys but 2. |
| 26 | 26 |
| 27 No surprise: these keys were missing their famous (well, for some at least) spring: | 27 No surprise: these keys were missing their famous (well, for some at least) spring: |
| 28 | 28 |
| 29 .. image:: {filename}images/hp8662a/key_missing_springs.jpg | 29 .. image:: {static}images/hp8662a/key_missing_springs.jpg |
| 30 :class: image-process-large-photo | 30 :class: image-process-large-photo |
| 31 | 31 |
| 32 As you can (not) see, the "Status" key as well as the "Increment Set" key have | 32 As you can (not) see, the "Status" key as well as the "Increment Set" key have |
| 33 no spring at all. | 33 no spring at all. |
| 34 | 34 |
| 47 While I was looking for a solution, I also gave a try to a simple solution: cut | 47 While I was looking for a solution, I also gave a try to a simple solution: cut |
| 48 a replacement "spring" from a plastic wrap. I tried several wraps (of several | 48 a replacement "spring" from a plastic wrap. I tried several wraps (of several |
| 49 widths), and I found one that seems to work just fine, and the feeling is about | 49 widths), and I found one that seems to work just fine, and the feeling is about |
| 50 the same as original keys: | 50 the same as original keys: |
| 51 | 51 |
| 52 .. image:: {filename}images/hp8662a/key_hack.jpeg | 52 .. image:: {static}images/hp8662a/key_hack.jpeg |
| 53 :class: image-process-large-photo | 53 :class: image-process-large-photo |
| 54 | 54 |
| 55 .. image:: {filename}images/hp8662a/key_hack_anim.gif | 55 .. image:: {static}images/hp8662a/key_hack_anim.gif |
| 56 | 56 |
| 57 I cleaned all keys using some deoxit contact cleaner which also lubricated | 57 I cleaned all keys using some deoxit contact cleaner which also lubricated |
| 58 those noisy springs making the keys nice ans smooth again. | 58 those noisy springs making the keys nice ans smooth again. |
| 59 | 59 |
| 60 | 60 |
| 68 I tried to replace it with a 3mm LED I had in my junk box, but it did not work, | 68 I tried to replace it with a 3mm LED I had in my junk box, but it did not work, |
| 69 so I bought a few replacement bulbs on ebay, and sure enough, the encoder is | 69 so I bought a few replacement bulbs on ebay, and sure enough, the encoder is |
| 70 now working ok (not perfectly, there are some missed steps: there are two small | 70 now working ok (not perfectly, there are some missed steps: there are two small |
| 71 screws that look like adjustment screws, but I'm not sure how to tune them). | 71 screws that look like adjustment screws, but I'm not sure how to tune them). |
| 72 | 72 |
| 73 .. image:: {filename}images/hp8662a/encoder.jpeg | 73 .. image:: {static}images/hp8662a/encoder.jpeg |
| 74 :class: image-process-large-photo | 74 :class: image-process-large-photo |
