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

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