comparison: content/hp3562a_4.rst
content/hp3562a_4.rst
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| 7 :Tags: HP3562A, HP1345A, repair, test equipment, DSA | 7 :Tags: HP3562A, HP1345A, repair, test equipment, DSA |
| 8 :series: HP 3562A | 8 :series: HP 3562A |
| 9 :series_index: 4 | 9 :series_index: 4 |
| 10 | 10 |
| 11 This is the part 4 of the series about my | 11 This is the part 4 of the series about my |
| 12 `HP 3562A Digital Signal Analyzer <{static}hp3562a.rst>`_, | 12 `HP 3562A Digital Signal Analyzer <{filename}/hp3562a.rst>`_, |
| 13 quickly describing the HP 1345A Digital Display unit as well as | 13 quickly describing the HP 1345A Digital Display unit as well as |
| 14 the repair I had to do on it. | 14 the repair I had to do on it. |
| 15 | 15 |
| 16 | 16 |
| 17 Display | 17 Display |
| 18 ======= | 18 ======= |
| 19 | 19 |
| 20 The display unit is a HP1345A Digital Display without the option 714 | 20 The display unit is a HP1345A Digital Display without the option 714 |
| 21 (wich adds a 4K x 16 bits Vector Memory), so it must driven by a | 21 (wich adds a 4K x 16 bits Vector Memory), so it must driven by a |
| 22 dedicated display controller (which is on the A38 memory board): | 22 dedicated display controller (which is on the A38 memory board): |
| 23 | 23 |
| 24 .. image:: {static}images/hp3562a/a8_a17_display.png | 24 .. image:: {static}/images/hp3562a/a8_a17_display.png |
| 25 | 25 |
| 26 The unit is a 6 inch monochrome display producing true vector graphics | 26 The unit is a 6 inch monochrome display producing true vector graphics |
| 27 with a resolution of 2048x2018 points. It can display up to 3226 | 27 with a resolution of 2048x2018 points. It can display up to 3226 |
| 28 inches of vectors at 60Hz. It also embeds a character generator. | 28 inches of vectors at 60Hz. It also embeds a character generator. |
| 29 | 29 |
| 30 It's a true vector display; vectors are drawn by moving the CRT beam | 30 It's a true vector display; vectors are drawn by moving the CRT beam |
| 31 on the screen (it's not a pixel based display). | 31 on the screen (it's not a pixel based display). |
| 32 | 32 |
| 33 .. image:: {static}images/hp3562a/hp1345a_raster_vector.png | 33 .. image:: {static}/images/hp3562a/hp1345a_raster_vector.png |
| 34 | 34 |
| 35 It can diplay: | 35 It can diplay: |
| 36 | 36 |
| 37 - solid lines | 37 - solid lines |
| 38 - solid lines with intensified end points | 38 - solid lines with intensified end points |
| 48 - 0.38cm/µs | 48 - 0.38cm/µs |
| 49 - 0.51cm/µs | 49 - 0.51cm/µs |
| 50 | 50 |
| 51 Allowing more brightness control of the vectors. | 51 Allowing more brightness control of the vectors. |
| 52 | 52 |
| 53 .. image:: {static}images/hp3562a/hp1345a.jpg | 53 .. image:: {static}/images/hp3562a/hp1345a.jpg |
| 54 | 54 |
| 55 | 55 |
| 56 If not connected with a controller, it shows a test pattern for | 56 If not connected with a controller, it shows a test pattern for |
| 57 adjustments. | 57 adjustments. |
| 58 | 58 |
| 59 .. image:: {static}images/hp3562a/hp1345a_test_pattern.png | 59 .. image:: {static}/images/hp3562a/hp1345a_test_pattern.png |
| 60 | 60 |
| 61 The unit looks like: | 61 The unit looks like: |
| 62 | 62 |
| 63 .. image:: {static}images/hp3562a/hp1345a_side.jpg | 63 .. image:: {static}/images/hp3562a/hp1345a_side.jpg |
| 64 | 64 |
| 65 .. image:: {static}images/hp3562a/hp1345a_side2.jpg | 65 .. image:: {static}/images/hp3562a/hp1345a_side2.jpg |
| 66 | 66 |
| 67 .. image:: {static}images/hp3562a/hp1345a_top.jpg | 67 .. image:: {static}/images/hp3562a/hp1345a_top.jpg |
| 68 | 68 |
| 69 | 69 |
| 70 Adjustment and repair | 70 Adjustment and repair |
| 71 --------------------- | 71 --------------------- |
| 72 | 72 |
| 86 started to look for all decoupling capacitors (directly connected | 86 started to look for all decoupling capacitors (directly connected |
| 87 between a power rail and the ground). It took me a little while before | 87 between a power rail and the ground). It took me a little while before |
| 88 identifing the real culprits, since the only solution to check them is | 88 identifing the real culprits, since the only solution to check them is |
| 89 to desolder (at least one end): A1C45 and A1C48. | 89 to desolder (at least one end): A1C45 and A1C48. |
| 90 | 90 |
| 91 .. image:: {static}images/hp3562a/hp1345a_dead_caps.jpg | 91 .. image:: {static}/images/hp3562a/hp1345a_dead_caps.jpg |
| 92 | 92 |
| 93 | 93 |
| 94 These 2 small (tantalum) caps near U3 were short. Not sure why they | 94 These 2 small (tantalum) caps near U3 were short. Not sure why they |
| 95 died when I powered the display unit with my power supplies, maybe I | 95 died when I powered the display unit with my power supplies, maybe I |
| 96 set them to a bit higher voltage then what the HP3562A generates. | 96 set them to a bit higher voltage then what the HP3562A generates. |
| 108 | 108 |
| 109 | 109 |
| 110 Brief description | 110 Brief description |
| 111 ----------------- | 111 ----------------- |
| 112 | 112 |
| 113 .. image:: {static}images/hp3562a/hp1345a_block_diagram.png | 113 .. image:: {static}/images/hp3562a/hp1345a_block_diagram.png |
| 114 | 114 |
| 115 .. image:: {static}images/hp3562a/hp1345a_stroke_generator.png | 115 .. image:: {static}/images/hp3562a/hp1345a_stroke_generator.png |
| 116 | 116 |
| 117 | 117 |
| 118 .. image:: {static}images/hp3562a/hp1345a_ramp_generator.png | 118 .. image:: {static}/images/hp3562a/hp1345a_ramp_generator.png |
| 119 | 119 |
| 120 | 120 |
| 121 .. image:: {static}images/hp3562a/hp1345a_vector_processor.png | 121 .. image:: {static}/images/hp3562a/hp1345a_vector_processor.png |
| 122 | 122 |
| 123 .. image:: {static}images/hp3562a/hp1345a_vpc_architecture.png | 123 .. image:: {static}/images/hp3562a/hp1345a_vpc_architecture.png |
| 124 | |
| 125 | |
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