comparison: content/TeK2445_2.rst
content/TeK2445_2.rst
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| 7 :Tags: Tektronics, 2445, analog scope, repair, test equipment | 7 :Tags: Tektronics, 2445, analog scope, repair, test equipment |
| 8 :series: Tek2445 PSU repair | 8 :series: Tek2445 PSU repair |
| 9 :series_index: 2 | 9 :series_index: 2 |
| 10 | 10 |
| 11 After a `quick repair of the PSU of my Tek 2445 | 11 After a `quick repair of the PSU of my Tek 2445 |
| 12 <{static}/TeK2445.rst>`_, I've started a more systematic replacement | 12 <{filename}/TeK2445.rst>`_, I've started a more systematic replacement |
| 13 of the capacitors. | 13 of the capacitors. |
| 14 | 14 |
| 15 .. image:: {static}/images/tek2445/psu_caps_replaced.jpg | 15 .. image:: {static}/images/tek2445/psu_caps_replaced.jpg |
| 16 :alt: Tek2445 PSU Caps being replaced. | 16 :alt: Tek2445 PSU Caps being replaced. |
| 17 | 17 |
| 57 exact specifications of the device; the service manual do not give the | 57 exact specifications of the device; the service manual do not give the |
| 58 value of the resistor in parallel with the 2.5µH inductance. | 58 value of the resistor in parallel with the 2.5µH inductance. |
| 59 | 59 |
| 60 .. image:: {static}/images/tek2445/dead_transistors.jpg | 60 .. image:: {static}/images/tek2445/dead_transistors.jpg |
| 61 :alt: Q1050, 1060 and Q1070 are dead. | 61 :alt: Q1050, 1060 and Q1070 are dead. |
| 62 | 62 |
| 63 For now, I've picked up a 3W 100Ω resistor and I've made a self by | 63 For now, I've picked up a 3W 100Ω resistor and I've made a self by |
| 64 hand. As I don't have a RLC meter, I don't known its exact value so | 64 hand. As I don't have a RLC meter, I don't known its exact value so |
| 65 I've took a few measures of its impedance at several frequencies, and | 65 I've took a few measures of its impedance at several frequencies, and |
| 66 I estimate the inductance to be around 4 µH. I have no idea whether | 66 I estimate the inductance to be around 4 µH. I have no idea whether |
| 67 this higher value might be a problem... But I've no idea either if the | 67 this higher value might be a problem... But I've no idea either if the |
| 154 transformer. | 154 transformer. |
| 155 | 155 |
| 156 While waiting for my DS0026 spare ICs, I'm trying to figure how I can | 156 While waiting for my DS0026 spare ICs, I'm trying to figure how I can |
| 157 elaborate a setup in which I am able to test the PSU without risking | 157 elaborate a setup in which I am able to test the PSU without risking |
| 158 its life again. I'll have to find my variac in my cellar, I guess. | 158 its life again. I'll have to find my variac in my cellar, I guess. |
| 159 |
