broken pedal, vestafire dsx, parts ID and switch op

[simon1138]

Hello,
I have a vestafire dsx multi distortion pedal, 1984 ish japanese i think.
It is broken, the switch needs replacing.
I replaced the battery connector.










i put the battery in, the red light came on, no sound, no bypass. then it stopped. i tested the battery and it was at 7v approx. last night it was 9v. i have noticed that a transistor seems to have been put round the wrong way. there is a white outline on the pcb which shows the correct way. though this may be some kind of mod? i am thinking it is flat out wrong but want to get a second opinion. does anyone know of a good methodical test procedure without the schematic? thanks
simon

EDIT: i spoke with the chap that sold me the pedal, he did replace the transistor which is meant for power, and turned it around which caused the pedal to work for a few minutes, though it didnt sound too good and then stop. also a large capacitor near the transistor.
i tried again with a new battery and checked the voltage of the battery in the circuit. it was going down quickly, 0.01 volts per second, like a countdown.
i have had a look at most of the ic and there is on mn3007 other than that they are mostly op amps, a flip flop, timer (555D) and a 5222 voltage thingy

[ElectricDruid]

It's possible that the reversed transistor is correct. Two typical pinouts for transistors are CBE and EBC. Since those are the opposites of each other, if you replace a transistor which has one pinout with the other, you finish up having to put  it in back-to-front.
The only way to be sure is to find a schematic and find out what transistor is fitted now.

It's a busy board, isn't it? Cripes. Those SIL op-amps are very evocative though. So Japan, so 80's! lol!

[simon1138]

thanks for the response, its just i am not sure why the are flipped. the one fitted is an alternative to what was there. i dont know what the original was, neither does the person i bought it from. unfortunately this is so old and rare that i can not find a schematic for it.
at the moment the current drain is the issue. i am not sure how to find the cause. i thought that if i start at the battery and try to follow the path testing as i go. problem there is the cost of the batteries. at that rate i would go through a good few of them.
any ideas???

EDIT: so i attached the 9v battery which is now around 4.9v and tested points on the circuit. i tested the fitted bc182 transistor which is the replacement alternative. the base shows battery voltage and emitter slightly less than battery voltage and collector show 2.9v approx. does that mean the transistor is nakerd?

[duck_arse]

EDIT: so i attached the 9v battery which is now around 4.9v and tested points on the circuit. i tested the fitted bc182 transistor which is the replacement alternative. the base shows battery voltage and emitter slightly less than battery voltage and collector show 2.9v approx. does that mean the transistor is nakerd?

please tell EXACTLY what is marked on the BC182. also, what are the other transistor type numbers in that area of the board, please?

also, probably you should ask a moderator to moove this thread to the building your own general area, as we aren't supposed to reply to posts in this [test] area.

[simon1138]

i removed the replaced capacitor and that stopped the battery drain. battery stay solid at its unloaded measured value. now, the red light comes on without anything attached. no bypass, no sound when activated?
any advice on where i could go from here?
thanks