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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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8802AJ Wireless Inspection Camera
no name maker, but like this one
http://kgbcameras.co.uk/cameras/0Bra...1226538224.jpg I cannot get the 2.4GHz link working, works wired in , clipped together. Anyone know what the secret is ? The camera is outputting syncs only , rather than CVBS is the main problem, anyone know if there is a secret way in ? I suspect as supposed to be waterproof , then a matter of hacking in. It would be much more useful with a clipped on close-up lens, for reading script, surprisingly not supplied |
#2
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8802AJ Wireless Inspection Camera
N_Cook wrote in message
... no name maker, but like this one http://kgbcameras.co.uk/cameras/0Bra...1226538224.jpg I cannot get the 2.4GHz link working, works wired in , clipped together. Anyone know what the secret is ? The camera is outputting syncs only , rather than CVBS is the main problem, anyone know if there is a secret way in ? I suspect as supposed to be waterproof , then a matter of hacking in. It would be much more useful with a clipped on close-up lens, for reading script, surprisingly not supplied Convinced myself hacking-in only. I hacked in along the mould line and accessed the inside without further damage. 22 way bridge between CCD plus 2x LED and rest of pcb, maybe fudgeable for miniture 7x7x10 lens and ccd . Whole ,with current pcb, could be easily cut down to 12x 7mm access port instead of 16mm original. Anyone knows of a simple "elephant trunk" mechanical manipulator mechanism? very stiff and unweildy spiral steel trunking umbilical as is. uses wbcam type lens and CCD and Vimicro 44 pin VC0703NLEB cant get any closer than http://www.vimicro.com/english/product/d_vc0703.htm# also 8 pin u724 6M xtal outputs CVBS with 3.3V supply |
#3
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8802AJ Wireless Inspection Camera
vimicro is 48 pin , 15 thou/mil spacing
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#4
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8802AJ Wireless Inspection Camera
From this odd named file
http://www.sh2a.com/Microsoft%20Word%20-%202A-cmos.pdf and pins 1,2,3,4, 7 tied to Vss and p8 Vdd , then the 8 pinner marked U274 16B-1 probably an EEPROM but why ? NTSC/PAL selection would surely be just taking some pin high or low on the 48 pinner. Contrast and brightness carried i2c to the front end? will check later today |
#5
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8802AJ Wireless Inspection Camera
N_Cook wrote:
From this odd named file http://www.sh2a.com/Microsoft%20Word%20-%202A-cmos.pdf and pins 1,2,3,4, 7 tied to Vss and p8 Vdd , then the 8 pinner marked U274 16B-1 probably an EEPROM but why ? NTSC/PAL selection would surely be just taking some pin high or low on the 48 pinner. Contrast and brightness carried i2c to the front end? will check later today That PDF is for a USB camera which would need VID and PID info from somewhere, hence the EEPROM. Your one's VIMICRO VC0703 chip is configurable for a lot more than just PAL/NTSC. I would expect the OSD feature alone to need an EEPROM to store the text and the rest of the config might as well be kept in the same chip. -- Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED) ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk [at]=@, [dash]=- & [dot]=. *Warning* HTML & 32K emails -- NUL: |
#6
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8802AJ Wireless Inspection Camera
IanM wrote in message
... N_Cook wrote: From this odd named file http://www.sh2a.com/Microsoft%20Word%20-%202A-cmos.pdf and pins 1,2,3,4, 7 tied to Vss and p8 Vdd , then the 8 pinner marked U274 16B-1 probably an EEPROM but why ? NTSC/PAL selection would surely be just taking some pin high or low on the 48 pinner. Contrast and brightness carried i2c to the front end? will check later today That PDF is for a USB camera which would need VID and PID info from somewhere, hence the EEPROM. Your one's VIMICRO VC0703 chip is configurable for a lot more than just PAL/NTSC. I would expect the OSD feature alone to need an EEPROM to store the text and the rest of the config might as well be kept in the same chip. -- Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED) ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk [at]=@, [dash]=- & [dot]=. *Warning* HTML & 32K emails -- NUL: there is only 4 wires between this camera pcb , down the 1m long spiral trunking to the monitor etc, 0,3.3V, illumination LED supply (variable), and CVBS signal out. |
#7
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8802AJ Wireless Inspection Camera
Repaired another of thse endoscope things, just mechanical damage to the
metal barrel surrounded "S video" connectors used as small polarised 4 way connections. Sticking a 20D/ 50 mm focal length lens over the lens cover means you can focus down to a conventional 16 pin DIL package to read script. Image is then linear x2 so fills the height of the LCD screen. If you were to cut away the waterproof lens cover and picked at the weak glue around the LEDs and lens carrier you could unscrew it , web cam fashion, to focus closer. Anyway given up on this one , come to conclusion half the vimicro is kaput. Annoyingly about 40 MHz clock and 9 output lines from the CCD work with plenty of signal variation to content of view variation. But CVBS output is corrupt , absolutely no image content. There are 3 sync pulses and 2 colour bursts per line interval. Tried removing EEPROM as no clock burst , just apparently matching L to H with 2 or 3 negative pulses only, then staying high, on (presumably) SDA and SCK pins. Removed EEPROM and same signal on vimicro pins , but then no o/p signal at all. Replaced with an as found 24C04 and same nothing out. Probably too much of a workup to descramble those 9 lines to give even just a monochrome image |
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