i've been using this site since 2001 and decided to ask here for expert help.

I have a very old Playstation bought in 1994 with both the Bias/Gain potentiometers damaged, that is they're missing the heads that adjusts them....

I noticed this in 2005, when it refuse to boot up and just spun very fast then stopped.

i was going to take it to the junk yard for money but
recently found a website that says you can replace the pots with resistors
Playstation 1 Technical Reference

but its not clear what i need to do and i am worried of damaging the board, should I pull 2 pots out with pliers then solder resistors onto the same spot?

this photo isn't clear where the resistors are placed, can anyone recognise this part of the board? it's not said where they are, beside the fuses or ribbon cable?

Hi agian!

thanks for your reply, but are you sure the resistors are actually these wires on the very bottom page (last photo?)

i have resistors with me already and they are the same color as the ones on photo attached in my 1st post. i just dont know where i should solder them because the website didn't say where to but only showed the photo i attached
!

i've actually found a photo of my mo-bo here http://obrazki.elektroda.net/76_1244041685.jpg its a 1002 like mine exactly

i cant clearly find the Q502 on the link here, but on photo 1 it's clearly visible so i'm not sure if the bearykirby uses a 1002 psx on his photo?

i see a tiny smf chip beside resistors but can't figure out what code it is? is there any diagram of the motherboard 1002?

Ok! time to open up my playstation!!
The only thing I need to know is how gentle do I have to be with the cables such as ribbon ones?

the last time I opened a Ps was 2005, when I pulled the laser to throw it out (i sold the ps, it was a 7502)

, but
now I need to be as gentle as I can because Im just installin 4 resistors into the board, then i'm putting it all back together!
I remember how hard it was to pull that Laser ribboncable out it was almost impossible and soo tight!(in 2005)

can anyone here give me expert advice on safely removing a laser ribbon without bending/forcing it out? and do i need to protect my console from static that i could transmit? (like computer parts etc.)

haven't plugged it in since october '08 so I don't think its got any electricity stored in there!

Oh, im also puttin some lube in my laser so it doesnt sound 15 years old! i'll be following a guide i got years ago !

i might vacuum inside with my mini vacuum from 99, is it ok to? it's meant for pc cleaning like circuit boards and fan ducts.

Edit: my soldering iron is only 8 watts . is that powerful enough to solder resistors? thanks guys!

Well I wrote to the host of the tech site where i found this tutorial and here's what he told me!

Hi.

The tutorial isn’t mine. I had it on my page as a reference for myself when I thought I might fix/mod PSx games. But the reality is this:

1) Buy and large, gamers are cheap; they want everything free (or as close to free as possible) – Not good if you’re trying to run a business.

2) It’s next to impossible to get parts for the games. Sony doesn’t make them easily available. If you actually find someone who has any, they’re reluctant to sell them because they can either make $20 selling something to you, or upwards of $100 selling it to a customer installed in their game. . (This opinion is a few years old, as is the Tech Page, but nowadays, it’s probably less costly to just buy a new unit.)

Reason 1 plus reason 2 is reason to not bother with it.
Sorry I couldn’t be more help.

Thom

i think i'm going to try using something like a multimeter and figure out where i get a voltage reading for the bias control then for the Gain,

is there anyone experienced with resistors who can tell me where i can access the bias and Gain voltage to change it?

so far i've done some work for my Plastic laser which has now made it horizontally straight and not leaning on one side,
i noticed my laser sled had been wearing out on the far right and it made the whole laser sit lower then it should which causes the focus and boot failure i've been getting with this psx from along time ago!

i might post photos of my whole motherboard later to see if anyone has done the really hard part about resistors! thanks for your help so far i am now half way there......

ok! i've done my laser cleaning and i'm about to apply some White Lithium grease to my laser sled as suggested by beary kirby,, i just have one PROBLEM - I ACCIDENTALLY PULLED THE POWER CABLE OFF TOO HARD and it came out of the board, Ok i will not panic! but im going to attempt to solder it back very very gently! wihtout contacting the circuit board at all! is there anything i need to know before soldering the white cable back? for instance how much pressure is applied to it, and will i need to solder from the top! or underneath, whats more safe? pls help me im almost finished just this one thing!