Problem with LX Modded SPC900

[michael8554]

I posted this in the main yesyes SPC900 Mod thread but no replies, so trying a separate post

I'd be grateful for some help fault-finding on my yesyes modded SPC900

In SharpCap it's working in non-LX mode, but not in LX mode
I get a grey display, the noise pattern changes at the end of each long exposure period.

USB to Serial is recognised in XP as "Prolific USB-to-Serial" on COM2
 "Philips SPC900NC PC Camera (LX Mode)" selected in SharpCap
 "Exposure Control Line" set to RTS and "Amp Off Control Line" to DTS (inverts are not checked, but makes no difference when checked)
 The exposure progress bar at bottom right progresses and the preview frame count rises.

The hi/lo voltage readings below are during exposure, then during readout.
 The readout period is short and my DVM is too slow to register the real reading, so I will report the lowest seen.

At the RTS diode anode I get 4.7v, then down to below 2v
At the first BC547 base 0.675v, then 0.2v
At the first BC547 collector/second BC547 base it's inverted, 0v then 3.3v
At second BC547 collector (Base 9) it's 3.8v, then 3.3v - these two are accurate readings, the range seems rather small?
Second BC547 emitter (Pin 9) is steady at 3.23v

I removed and tested the Amp-off and the second LX BC547's
Both seemed okay, swapped their positions, still not working

Can anyone please supply the correct BC547 voltages?

The circuit is here:

http://www.yesyes.in...oad_file/17/84/

Your hopefully

Michael

[michael8554]

UPDATE:

I'm absolutely certain that there's a faulty component, it couldn't possibly be a wiring error?

Erm... yes it was

I had soldered the wires to pin 7 and base 7 onto pin 9 and base 9, and vichy verser

So you can all relax now, panic over

I blame the wife of course...

Michael