monitor adjustment - pincushion

[fa001]

I picked up a used multimedia monitor. It works fine through the CGA video in however it has a pincushion problem that the adjustment on the monitor does not correct. Is it possible that the adjustment pot needs cleaning / replacement or is there some where else I should look for an adjustment?

[grantspain]

does the pincushion problem change when you adjust the width

[qrz]

if adjusting the pot has no effect , there may be a faulty diode/cap in h return and/or a faulty xistor in the pin amp.

make/model of monitor ??

"should " be an easy fix .

qrz

[fa001]

grantspain,
The width control does not fix the pincushion.
qrz,
On the outside it says SELCO ITALTEL MULTIMEDIA
On the inside it says Videocolor A66ECY13X01

Playing around a little more I find that using the composite video in gives an image that can be adjusted correctly. But I can still not get the RGB in to correct.
It is strange the although I know the board outputs negative sync for this monitor to sync I have to set its switch to positive sync.
I think that I need to try a different RGB source. Is the pincushion effect caused by the source signal or the monitor circuits?

[fa001]

Spent some time improving the wire connection and the picture is better.
The width does make a difference if I turn it down to less than full screen I can get the edge straight.
Perhaps that is how this board set plays.

[qrz]

ok, its a 26"-   and guessing an italian monitor .   have a model number , pic of pcb ... something  ?

qrz

[fa001]

qrz,


And the only print I see on the board is

It is inside a black metal case.
Do you need different  views or ??

[BASS!]

The monitor is a Seleco Italel Multimedia SMV-290 USA

Inputs Are:

Scart
VGA - 9 pin


Similar specs for the smv-300 (all I was able to find through google)
Product Features
Features   

    * FST Black Matrix 28" CRT
    * Automatic Priority: video 1 - RGB - video 2 (only NBP)
    * Colour System PAL/NTSC
    * CTI & Comb filter (only NBP)
    * Colour temperature: 6.500°K / 3.299°K (selector)
    * SCART/Peritel: RGB + video 2 (only NBP)
    * Random Delay on switching-on (adjustable) 5:15 sec.
    * External regulations for geometry and picture adjustment
    * Mains voltage: 110-120V Ac / 220-240V Ac

Picture Tube   

    * CRT: 28" CRT (71 cm diagonal), World-wide
    * Dot pitch: 0.8 mm

Electronics   

    * Colour system (SMV300 NBP only): PAL & NTSC automatic selection
    * CTI & Comb Filter (SMV 300 NBP only): standard
    * Signal inputs: Composite Video, RGB +Sync
    * RGB bandwidth: 7 MHz ±3dB
    * Horizontal scan frequency: 15.625 Hz ±600Hz (PAL); 15750 Hz ±600Hz (NTSC) automatic selection
    * Vertical scan frequency: 50-60 Hz autolock, with automatic size control
    * Cut off: automatic
    * Colour temperature: 6500°K (normal) and 3200°K (internal selection switch)
    * Colour temp. adjust.: 6500°K internal adjustment for both black level and white level

Input/Output   

    * Analog RGB input: (SMV 300 RGB): via Canon DB9 connector.
    * Analog RGB input (SMV 300N - 300 DELTA): via Canon DB9-sub and SCART socket.
    * TTL RGB input (SMV 300N - 300 DELTA only): via Canon D9-sub
    * Video input 1 (SMV 300N - 300 DELTA only): via BNC connector
    * Video input 2 (SMV 300N - 300 DELTA only): via SCART socket
    * Video output (SMV 300N - 300 DELTA only): via BNC connector (passive loop-through) just for Video input 1

Controls   

    * External controls (SMV 300 RGB): brightness; contrast; colour saturation and Hue; H and V amplitude, H and V shift.
    * External controls(SMV 300N - 300 DELTA):brightness; contrast; H and V amplitude, H and V shift; Keystone, Pincushion and vertical linearity.
    * Main switch
    * External switch (SMV 300N - 300 DELTA): 75? on/off (only for Video 1)

Electrical Data and Operating Conditions   

    * Warm up time: 30 minutes
    * Degaussing: Automatic when switched on
    * Switch on delay: random within 2 to 8 sec
    * Input Voltage: 120-240 V; 50/60 Hz with loop through power supply. Voltage rating manually adjustable though a voltage selector on the rear panel. Factory default setting: 220 Vac.
    * Ambient temperature: from 0° to 40°C
    * Relative humidity: from 0° to 90% not condensed
    * Power consumption(max):2A @ 120V; 1A @ 220-240V
    * Power supply loop through: 4 units @ 120V; 8 units @ 220/240V

Mechanical Data   

    * Dimensions (WxHxD): 594 x 469 x 505 mm
    * Package size (WxHxD): 700 x 600 x 620 mm
    * Net Weight: 40 Kg
    * Gross Weight: 48 Kg (max)
    * Maximum number of monitors can be stacked: 10 units

[BASS!]

ps,

 Isnt that a vertical game?

[fa001]

The game is 10-yard fight. It is horizontal. It just looks like a vertical because of the monitor adjustment.
I think that I need to dig out another rgb source to see how it shows up.

[grantspain]

a weird problem,i was gonna say if the width affects the pincushion problem then i would suggest looking at the east/west correction diodes but you said another input gives a perfect picture so i am not sure

[fa001]

qrz,
 
This is the label on the back of the monitor case. Perhaps it will help you identify the monitor.


- Fred

[fa001]

It appears that every input just needs tweaking. As shown I was able to get MAME with an AVGA card to adjust. However I have ran into before that some game boards need more width and I have found that monitors will have an internal jumper or trimmer to increase the width. I think that that might be the problem with the 10-yard fight board I first tried. But MAME works!

[BASS!]

would you mind posting what resolutions you've run? It could very well just be that it doesn't like a particular size.

[fa001]

uprightbass360,
I think that I may have caused some confusion. My original post was from the actual game board not mame using some resolution. It is only from the game board that I could not adjust the monitor to match.

- Fred

[BASS!]

Ahhh I knew I was missing something. How about did you end up wiring the cord. I was working on one but I think I'm missing something. What was the pin out that you ended up using. I actually wired a cord as you had posted in your first post and got the immovable H axis. Did you end up separating your syncs?

[fa001]

I wired as I posted in the buy/sell/trade forum.
I used the 9 pin cable that came with it cut the small round end off.
I found the wires inside to be:
pins 1&2 signal ground the shield wire
pin 3 Red signal the Black wire
pin 4 Green signal the Brown wire
pin 5 Blue signal the Red wire
pins 7&8 Sync signal the Orange wire

I guess that it is possible that not all the cables used the same color / signal combination. So you might want to test the pin / wire color.

[fa001]

Also note that for whatever reason the sync switch on the back of the monitor seems to be backwards. I know that the game board put out neg sync but I had to set the monitor switch to positive sync. So if you are not get a solid picture try switching the sync switch.