luong@grace.cs.washington.edu (Luong La) (03/26/90)
There is no reason for modifying your 130[2/3] when all your monitor does
is in 1 mode (or rarely do mode switching). Otherwise take a risk :)
It cost me $1 for parts and 2 hrs to modified my 1302.
In addition to Don's hints in his e-mail (including below),
I like to throw in my 3cents advice(s):
i> Be gentle w/ the monitor's chasis.
ii> Geometry corrections(pincushioning, etc..) it works (more precisely)
when the monitor is in its upright position.
iii> Put vertical control in place of BRIGHT control knob is a good
idea (it works for me!)
iv> If you don't a service manual then locating the part require an extra
5 minutes (max). I did it by scanning along a ruler as I pan it
left to right. R510 located about 1" from the center of D board, and
R322 is about 1.5" from the edge-center.
v> BRIGHT -> vertical:
- Disconnect BRIGHT; put a resistor in place as Don suggested.
- ground of vertical connect w/ 2nd pin of BRIGHT
- other 2 of vertical connect w/ bottom pin of BRIGHT
- voila! you have 2 vertical control knob
for monitor owner w/ tilted picture (I were one :-) ) Please do this w/
the monitor's power OFF.
- loosen the clamp's bolt near the electron gun (tail end of the tube).
- turn the yoke to counter the tilt.
- tighten the bolt when done.
======Don Montegomery's email starts here:
From donm@hpnmdla.hp.com Fri Mar 23 09:09:46 1990
Since there are so many users of the SONY 1302/1303 multisync monitors
also using VGA, I am passing along this information on modifications to
make their machines autosize when changing program applicatons. Sony
wants $100 to do the change. If you're reasonably handy with a solder-
ing iron, you can do the whole thing in about an hour. If you don't have
the service manual, you can expect to spend several hours with a magnifying
glass just _locating_ the components that require changing.
-----------------------------------------------------------------------------
SONY AUTOSIZING MODIFICATION
These autosizing modifications for the SONY CPD 1302 were made available by
Greg Fredericks of
SONY COMPUTER PERIPHERAL PRODUCTS DIVISION
Sony Drive, Mail Drop 2-46
Park Ridge, NJ 07656
Voice: (800) 438-7669
FAX (201) 930-0877
Model CPD-1302/1303
Subject: Upgrade To Minimize Vertical Size Differences Between Text
And Graphics Modes At 60 Hz to 70 Hz Vertical Scan Rates
1. Replace the following resistors: Part Number
R510: 1.2 ohm -->1.0 ohm 1-216-349-00
R322: 120 Kohm -->270 Kohm 1-247-889-00
2. Input a 31.5KHz Hor., 60Hz Vert. analog signal from
the generator. Set picture to minimum, switch to analog
mode adjust and adjust RV306 (V SW. FREQ.) to obtain
6.10 +/- 0.02V between TP2 and ground.
3. Switch to digital -D2 position
Adjust RV307 (50/60) to obtain 6.80V +/- 0.02V between
TP2 and ground.
4. Using CPD test generator, confirm that monitor
switches to green text mode at 18.41Khz/50Hz and
color bars at 21.8Khz/60Hz.
5. Adjust vertical size for VGA full screen display
(no overscan-until picture meets edge of CRT.
6. Readjust pincushion at 31.5KHz Hor., 60Hz Vert.
---------------------- END OF SONY'S MODIFICATIONS --------------------
HINTS FOR DOING THE MODIFICATION
Please note that anything you do to your monitor will void its warranty, if
any.
Sony calls for a flameproof resistor at R510. I used an ordinary 1 ohm, 1 watt
carbon composition resistor, but had to enlarge the holes on the pc board in
order to pass the leads through. Orient the resistor "radial" style and space
the resistor about 1/2 inch from the board. Place the resistor body so that
it clears any nearby component. I used a 1/4 watt carbon composition resistor
for R322.
Having spent a great deal of time tracking down the components on the sche-
matic and pictorial overlays, the gridsquares are included below for your
convenience.
R510 is on the D Board at schematic gridsquare B 13, and at G 5, pictorial.
R322 is on the BA Board at schematic gridsquare B 11, and at I 7, pictorial.
RV306,RV307, and TP2 are located at schematic gridsquare I 17 on the BA Board,
and D 9 on the pictorial.
I could not get any adjustment out of item 3 of Sony's mods. The voltage at
TP2 remained around 12.1 volts. I suspect it would be necessary to use an
EGA card in the computer to adjust RV307 for the "digital -D2" position in-
stead of the VGA card (Orchid) I was using.
It will be necessary to touch up the CRT geometry after the modification,
particularly RV504. You can use your computer for the "CPD test generator".
It would be a good idea to have a method of displaying a crosshatch for the
geometry adjustments. There are several available via Public Domain software
such as CRTALIGN.ARC or TESTPAT.ARC. You could also conceivably just fill the
screen with alphanumerics from top to bottom to get an idea of how the adjust-
ments were going.
You will need to turn the monitor on its side for the following so access can
be gained to the D board (located on the bottom). Be extra careful if you're
doing this with the power on. You could get severely zapped!
RV570 (D board) adjusts top and bottom keystoning
RV504 (D board) adjusts center pincushioning
RV503 (D board) adjusts top and bottom pincushioning
RV580 (D board) adjusts top and bottom horizontal overscan
Return the monitor to its upright positon (keep away from those electrons!)
and adjust:
RV301 (BA board) adjusts top and bottom linearity
RV302 (BA board) adjusts top, bottom vs center linearity
In order to alleviate any subjectivity, I used a straightedge for the
pincushion adjustments.
By the way, I also moved the VERTICAL SIZE control to where the BRIGHTNESS
control was located. Replace the lines going to the original BRIGHTNESS
potentiometer with a 5100 ohm, 1/4 watt resistor. This isn't really neces-
sary for the autosizing mod, but makes it a lot easier to "tweak in" the
vertical size from the operator's position.
Service manuals are available from:
SONY PUBLICATIONS
P.O. Box 20407
Kansas City, Missouri
64195
Phone (816) 891-7550
Cost is $9.00 plus $1.35 shipping and handling. Don't forget to include sales
tax if applicable. I definitely wouldn't attempt the modification without the
service manual nor the ability to sling solder.
Neither myself nor my company accept any responsibility for these modifica-
tions. You do so at your own risk. DO NOT make any adjustments to the high
voltage circuitry without proper instruments unless you're due for your annual
dose of X-rays. Also be warned, this equipment is quite capable of causing
severe electrically-induced damage to your body if you get your fingers where
they don't belong!
Good luck with the modification. It was well worth the time spent.
donm@hpnmdla.HP.COM
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===RLab===Epsilon task takes infinite time=== luong@grace.cs.washington.edu