From: goose@access.digex.net (GOOSE)
Newsgroups: alt.games.video.sony-playstation
Subject: FMV SKIPPING PROBLEM FAQ
Date: Thu, 27 Feb 1997 18:17:14 +0100

(this is best viewed with MONACO Font, size 9)

OK, 
So you have the FMV Skipping Problem......well here are some instructions
on how to possibly fix it or at least Improve it.

What is the FMV SKIP?? It's self explanatory....you experience a skipping
during FMV or CG animations and choppy sound probably for some music
tracks.
 
You can either take the technical route if you have electronics experience
with a digital Multimeter or you can take the halfass route.
Please note...the potentiometers are what are often referred to as the
SCREWS that one needs to turn. The labeling of them is in very small white
letter on the Circuit boards so use a magnifying glass if you don't have
good eyesight


1st UNPLUG your PSX....and let it sit for like 10 -15 minutes so any
energy which could roast you can dissipate you. Though there is very
little chance of this if you are not a complete idiot...dont touch
anything unless you have to which means...only turn the potentiometers.
You will only plug the PSX back in to test if your adjustments have worked.

Opening the PSX is a piece of cake....all you have to do is remove  the 4
screws on the bottom of the machine....turn it back over and lift off the
top case.

If you are technically inclined.....by all means follow Mas' detailed
instructions using the Multimeter.
If you are not....my best recommendation is to turn the F BIAS Screw 1/8th
of a turn but no more than a full turn.
Always remember the initial positions of the potentiometers/screws so you
can put them back if nothing happens.

If you run into FMV (Full Motion Video) problems, here are a few tips you
can do to either "fix" the problem completely, or at least "improve" it.

1. There are actually four (4) variable resistors (potentiometers) inside
the system all are located near the power connector and the orange flat
connector of the CD Drive Unit: 2 are marked as "F Gain" (pot. 1), and "F
Bias" (pot.2), one is above the 4-pin power connector for the drive (US
systems), or under the metal shield (JAP systems) (pot. 3), and the last
one on the drive itself (pot. 4)

2. Do not blindly turn these pots without "first" recording their original
values (in K ohms) so that if you mess things up (make the problem worse)
you can always set them back to their old settings (values). Use a digital
Multimeter to perform the next steps.

3. Record the values of all 4pots ( the following values are the ones I
have recorded on both US & Japanese systems with NO FMV Problems, all
measured with ALL Connectors attached.

4. Use a small flat head screwdriver to turn the pot either clockwise or
counterclockwise to obtain the desired values:

US SYSTEMS
---------------------
Pot 1    Pot 2    Pot 3    Pot 4
-------- -------- -------- --------
3.25K    11.97K   18.11K   0.00
3.73K    11.44K   21.91K   0.00
3.49K    12.26K   24.32K   0.00
3.16K    12.65K   25.05K   0.00

JAPANESE SYSTEMS
-----------------------------------
Pot 1    Pot 2    Pot 3    Pot 4
-------- -------- -------- --------
3.88K    11.26K   4.08K    0.00
5.84K    11.15K   3.40K    0.00

The values above are recorded by applying the 2 leads of the meter probes
to Point (1) and (2) of the potentiometer diagram below.
      
           []1
           O
         [] []
         2   3

After adjusting your PSX by whichever method you use, you can test it by
plugging it back in (yes you can leave the top off when you test it),
putting a disc in, depressing the lid cover button and turning the PSX
ON.....(Choose a game with a FMV Intro to see if you fixed the problem).
If the FMV Skip is still there or has gotten worse, continue adjusting. If
it has improved, you may want to adjust a little more or try another set
of Pot Values from above to see if they work better. That's it....
If none of this works......call SONY.  
Always make sure your PSX is on a level flat surface, and it has plenty of
ventilation room underneath it.
Note that the ventilation is the main culprit of this...especially if you
play your PSX for long period of times.

This information was posted by Mas in Fall 1996, and appended by me, so I
have no idea where the pots or values are for the newer 5500 models of the
PSX (i.e. the PSX with the Unified Multi-AV port).