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| Tektronix 7633 Scope, Can anyone please help Old64goat!!! |
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| finom1:
Another update video from Bill: Z -AXIS BOARD REMOVAL - Thanks everyone for all your help!!! |
| finom1:
Can someone please instruct the Old4goat on the next steps to take? Thank you!!! |
| David Hess:
I forgot about the readout board position on your 7633. You definitely had to remove it. I cannot see it on your video but on my 7603, there are definitely 2 screws behind the z-axis board which hold the cover on so you have to find a way to get that last screw holding the z-axis board to the high voltage cover removed. I used a screwdriver with a thin shaft but larger head. I suppose you could notch that aluminum rail above the screw to gain better access. I think the screws on the side of the high voltage cover are holding the high voltage board to the inside of the cover. The 7603 is a little easier to deal with because the readout board is mounted where the 7633 has its storage board which is forward of the high voltage cover. That was a great drawing that you made for reattaching the cables. Tektronix packed a lot into the 76xx series oscilloscope chassis although the only major addition to the 7633 is the storage board which goes where the 7603 readout board was. |
| finom1:
--- Quote from: David Hess on May 05, 2017, 03:01:52 am ---I forgot about the readout board position on your 7633. You definitely had to remove it. I cannot see it on your video but on my 7603, there are definitely 2 screws behind the z-axis board which hold the cover on so you have to find a way to get that last screw holding the z-axis board to the high voltage cover removed. I used a screwdriver with a thin shaft but larger head. I suppose you could notch that aluminum rail above the screw to gain better access. I think the screws on the side of the high voltage cover are holding the high voltage board to the inside of the cover. The 7603 is a little easier to deal with because the readout board is mounted where the 7633 has its storage board which is forward of the high voltage cover. That was a great drawing that you made for reattaching the cables. Tektronix packed a lot into the 76xx series oscilloscope chassis although the only major addition to the 7633 is the storage board which goes where the 7603 readout board was. --- End quote --- Thank you David for helping!!! |
| finom1:
This was posted on Old4goat's youtube channel: "Zeebee19718 hours ago High voltage compartment dismantling guide: page 4-22 (139 of 320 in pdf document). HIGH-VOLTAGE COMPARTMENT The components located in the high-voltage compartment can be reached for maintenance or replace-ment by using the following procedure. Diagram 7 shows the location of components in the high-voltage compartment and color-coding of the wires. NOTE All solder joints in the high-voltage compartment should have smooth surfaces. Any protrusions may cause high-voltage arcing at high altitudes. 1. Remove the heat radiator/Low-Voltage Regulator assembly as described previously. 2. Disconnect the crt base socket. 3. Disconnect the crt anode plug and discharge it to the chassis. Using an insulated probe or wire, discharge the jack portion of the crt anode connector to chassis ground. 4. Disconnect the multi-pin connectors on the Z-Axis Amplifier board. 5. Remove the screw on the bottom of the high-voltage compartment and the two screws located at the top. 6. Guide the high-voltage compartment away from the instrument chassis. Be careful not to damage any of the components or the pin connectors on the High-Voltage or Z-Axis Amplifier circuit boards. Dis-connect the multi-pin connectors on the High-Voltage board. 7. Using an insulated shorting strap, discharge the exposed connections to chassis ground. 8. Disconnect plug P1196 and the four screws which secure the High-Voltage board to the high-voltage compartment. Now, all of the circuitry in the high-voltage box can be reached for maintenance. 4-22 REV. B, DEC. 1974 Low voltage PSU dismantling guide: page 4-16 (133 of 320 in pdf document). REGULATOR CIRCUIT BOARD REPLACEMENT. 1. Remove the four screws which secure the protective cover to the rear of the instrument. Remove the protective cover. 2. Disconnect the pin connectors. 3. Remove the four screws which secure the Regulator and Fan-Motor subassembly cover to the rear of the instrument. 4. Remove the two screws which secure the Fan Motor, and remove the Fan Motor. 5. Remove the four screws which secure the plate to the heat radiator. Remove the plate. 6. Remove the power transistors from the back of the heat radiator. Note the location of each power transistor. 7. To replace the Regulator board, reverse the order of removal. NOTE After replacing the power transistors, check that the transistor cases are not shorted to the heat radiator before applying power. 4-16 REV. B, DEC. 1974?" Great detailed information, thank you for sharing!!! |
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