T-View 100 » History » Version 6
manawyrm, 02/19/2022 01:26 AM
| 1 | 1 | manawyrm | h1. T-View 100 |
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| 2 | |||
| 3 | 3 | manawyrm | T-View 100 was a video telephone, made by Deutsche Telekom / Siemens. |
| 4 | 1 | manawyrm | |
| 5 | 6 | manawyrm | @manawyrm has two of these phones, @LaForge owns one as well. |
| 6 | |||
| 7 | 5 | manawyrm | h2. External photos |
| 8 | !{width:40%}IMG_3665.JPG! !{width:40%}IMG_3666.JPG! |
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| 9 | |||
| 10 | Power supply is called STN20, output DC 22.5V; 0.9A. Center positive, 5.5/2.5mm barrel jack. |
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| 11 | The RCA connectors are (from left to right): Audio out, Video out, Video in, Audio in |
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| 12 | The purpose for the Mini-DIN port (marked with a computer icon) is currently unknown. It's connected to a MAX202 internally, so probably carries a RS232 serial. |
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| 13 | |||
| 14 | h2. Internal photos |
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| 15 | 3 | manawyrm | |
| 16 | Video/Interfacing PCB: |
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| 17 | !{width:40%}IMG_3633.JPG! |
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| 18 | |||
| 19 | Telephone PCB: |
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| 20 | !{width:40%}IMG_3644.JPG! |
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| 21 | |||
| 22 | Display/Camera PCB: |
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| 23 | !{width:40%}IMG_3656.JPG! |
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| 24 | |||
| 25 | 1 | manawyrm | h2. Common faults |
| 26 | |||
| 27 | - Faulty display hotbar |
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| 28 | 3 | manawyrm | Symptoms: Missing (pixel) rows / columns on the (24x2) character LCD. |
| 29 | 1 | manawyrm | |
| 30 | - Faulty capacitors |
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| 31 | Symptoms: Crashing, low display contrast, flickering LEDs, poor video quality, mains hum on the speakers |
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| 32 | |||
| 33 | |||
| 34 | 3 | manawyrm | h2. Phone disassembly |
| 35 | 1 | manawyrm | |
| 36 | 6 | manawyrm | The bottom cover plate has 6 Phillips screws and is clipped together at the bottom. Use multiple guitar picks to get them free. |
| 37 | 2 | manawyrm | The plastic does not seem to be brittle (yet), some force is OK. |
| 38 | |||
| 39 | 1 | manawyrm | !{width:40%}IMG_3647.JPG! |
| 40 | |||
| 41 | Backside of the main video / interfacing PCB is visible under the cover plate: |
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| 42 | !{width:40%}IMG_3631.JPG! |
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| 43 | |||
| 44 | 3 | manawyrm | Lift the video / interfacing PCB out by pulling it straight up, it's connected via a rigid interface PCB (but not screwed down): |
| 45 | 1 | manawyrm | !{width:40%}IMG_3634.JPG! |
| 46 | 3 | manawyrm | |
| 47 | 6 | manawyrm | Unscrew the 7 Phillips screws attaching the plastic shield. Be careful with the speaker wires on the right, they are not detachable! |
| 48 | 3 | manawyrm | Lift the plastic shield out of the way to the right. When re-assembling, make sure the hook-mechanism and speaker are correctly in-place. |
| 49 | !{width:40%}IMG_3642.JPG! |
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| 50 | 4 | manawyrm | |
| 51 | h2. Display/camera disassembly |
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| 52 | |||
| 53 | Disassembling the display/camera unit is a bit tricky. You'll need a 10mm socket (and possibly socket extension)! |
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| 54 | |||
| 55 | Start by removing the 4 screws on the connector: |
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| 56 | !{width:40%}IMG_3650.JPG! |
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| 57 | |||
| 58 | then remove the 3 screws in the top of the unit. |
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| 59 | The sides of the display/camera unit are covered with round covers. They can be pulled out with a bit of force. |
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| 60 | !{width:40%}IMG_3652.JPG! |
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| 61 | |||
| 62 | Use a 10mm socket to unscrew the nuts on both sides. |
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| 63 | Lift the connector cover. This is tricky! Please fill in a good way to do this. The author broke 2 plastic clips by doing it: |
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| 64 | !{width:40%}IMG_3653.JPG! |
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| 65 | |||
| 66 | Remove both bolts (and the washers). The swivel piece can now be bent inwards slightly with a bit of force to get it out. |
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| 67 | !{width:40%}IMG_3654.JPG! |
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| 68 | Unscrew the 2 remaining screws holding the display unit together. |
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| 69 | |||
| 70 | There are clips all around the display/camera unit. Use guitar picks again and open the display. |
