i.d. this neotec chassis plz

cadillacman

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just got this today.. got a neotec tube+yoke, no identifying label.. looks like a 25 or 27 inch tube

got this neotec chassis with it, no identifying label... also looks like im missing a metal piece that would wrap around the flyback too..


but check the pics and lmk what you think. If i can save it i will for sure...

l_a629c845c41342538960450e621389c9.jpg

l_ce587804764844a5a5215e234636d63f.jpg

l_6a5dbae17bb84449a5832f877b210723.jpg



thanks guys.
 
or some variation aye?? the ones i was lookign at have some transistors and such that this one doesent and never has.. but looks like the same board between models just diff features taken off or added depending on the particular model huh?


i dont see anything to swotch res, mabye this is a cheaper lo res only model????
 
Does look like a "27" series chassis.... have been trying to remember if only one variation had that additional power supply looking board.
Usually there is a huge heatsink that wraps around the flyback and all that with labels on it like you mentioned being missing.
The 2700, 2701, 2702 are not switchable, just strictly CGA, EGA or VGA.
 
its kinda hard to tell bieng all the metal poarts are gone..

ive already modified a metal gard form a old makvision chassis so i have something to mount the hot to..

i have a feeling this was ran without the heat sink, cuz the hot it dead shorted.. however fuse isnt blown so mabye just manye ill get away with a cheap fix here..

oh wait on top of that the fly has a nice crack too.. so much for a cheap fix lol

if i can get it working then i can figure out if its std med or god forbid vga.. for what i have in it, ill take the gamble
 
damn ken your everywhere.. found this site abotu a guy who fixed up some san fran rushes... they used 27" med res nt2701's, my monitor frame says atari games corp...


so im gonna check the numbers you gave this dude and see if my stuff matches up.
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"K.Layton ( email deleted ken ;) ) provided some great info on the NeoTec NT-2701 monitor. This is a medium (EGA) resolution monitor. Circuit boards are marked as follows: Main board is silkscreened with "PCB-002B" on the foil side. Pincushion board is marked "F-DPC-001". Remote adjustment board is marked "NT-002" on the solder side between connectors P901 and P302. Neck board is marked with both "NT-001A" and "Li Chin" on the parts side of the board.


Re-Capacitor Information for main board:
C106 - 100 uf @ 35 volts
C110 - 1 uf @ 50 volts
C115 - 100 uf @ 160 volts
C116 - 100 uf @ 160 volts
C118 - 1000 uf @ 35 volts
C119 - 1000 uf @ 35 volts
C305 - 100 uf @ 35 volts
C424 - 10 uf @ 50 volts (upgrade this to 100 or 160 volts)
C501 - 470 uf @ 16 volts
Re-Cap on the Dynamic Pincushion Correction board:

C19 - 5.6 uf @ 50 volts Bi-Polar and High Frequency (very important!) Note: Mouser Electronics # 140-BPHR50V4.7 (4.7 mfd) or 140-BPHR50V6.8 (6.8 mfd) will work fine in this application.
Re-Cap on the neck board:

C921 - 4.7 uf @ 250 volts
C924 - 22 uf @ 250 volts (check soldering!)
So in summary, here's all the caps needed for ordering purposes since pre-made cap kits are not available for this monitor.

(1) 1 mfd 50 volts
(1) 10 mfd 100 volts
(2) 100 mfd 35 volts
(2) 100 mfd 160 volts
(2) 1000 mfd 35 volts
(1) 22 mfd 250 volts
(1) 4.7 mfd 250 volts
(1) 470 mfd 16 volts
(1) 6.8 mfd 50 volts Bi-Polar/High Frequency, Mouser #140-BPHR50V6.8.
CRT Information for the NeoTec model 2701.
It uses an RCA # A68AEG25X03 tube and matching yoke. Use B & K socket adapter CR-23 to test/rejuvenate this tube. Model 2701-S indicates a Samsung tube and matching yoke. Do NOT interchange these tubes or chassis!

Yoke Information includes Yellow & Green wires are the vertical section with 8 ohms dc resistance. Red & Blue wires are the horizontal section with 0.5 ohms dc resistance. Part numbers on the yoke are 68Q2UBZ/00 and RXE55398152. No yoke part numbers are in the manual.

Horizontal Output Information includes Transistor Q402 is the horizontal output transistor. It is a type 2SC5150 and you can use an NTE 2639 as a replacement. MCM Electronics stocks both of these at around $6 each.

Flyback Information for the NeoTec.
There's tons of numbers on the flyback (appears to be manufactured by Chun Peng). Here's the numbers I found on two of these flybacks: TLF 061A-01-12, TLF 061B-01-32, 741234BK, 3410-0180, MRCFT-249, 353024900, CP-808, 4I09, 47F10-FT-238, 47F10-FT-216, Neotec # FT-249, Happ Controls # 49-3041-00. Buying the flyback directly from Neotec is the cheapest as these are expensive flybacks.

Monitor problems encountered and solutions.
Symptom: No power up, fuse not blown. Found resistors R431 (10k, 1/4 watt) and R432 (22k, 1/2 watt) were both burnt due to electrolytic capacitor C424 being shorted. Cap c424 was originally 10uf @ 50 volts, but I suggest upgrading the voltage rating to either 100 or 160 volts. Generally if these parts are bad then the flyback is also bad too so replace the flyback also. You'll probably find pinholes in the top of the flyback as well as hairline cracks in the case around the focus adjustment pot. These flybacks seem to fail alot. Other persons have reported these components failing also and they should be checked out: C417, C419, C420, C421, C423.

Manual Errors found.
Include Resistor R431 value is wrong. It is incorrectly listed in the "Bill Of Materials List" as 1k, 1/4 watt (item #9). It should be 10k, 1/4 watt (item #19). The schematic shows it correctly. Resistor R432 value is wrong. It is incorrectly listed in the Bill Of Materials List as 100k, 1/2 watt (item #37). On the schematic it is shown as 12k, 1/2 watt which is also wrong. The correct value is 22k 1/2 watt. Always double check the resistor values installed on your particular chassis versus what's shown in the manual and schematics.

Main Board Adjustments for the NeoTec.
All are horizontal mount style with 6mm knob.

R112 - B+ Adjustment (5 k pot)
R314 - Vertical Linearity (10 k pot)
R418 - X-Ray Protection (5k pot)
R403 - Horizontal Frequency sub control (3 k pot) in series with horizontal hold pot on remote
R499 - Horizontal Position sub control (10 k pot) in series with horizontal position pot on remote
Pincushion Correction Board Adjustments for the NeoTec.
Horizontal mount style with 6mm knob.

VR3 - Phase (5 k pot)
Remote Adjustment Board Adjustments & Parts Information:
All are horizontal mount with 9mm knob.

R401 - Horizontal Hold control (5 k pot)
R325 - Resistor, 22 k 1/4 watt
R324 - Vertical Size control (50 k pot)
R323 - Resistor, 68 ?, 1/4 watt
R319 - Vertical Position control (10 k pot)
R318 - Resistor, 2.2 k 1/4 watt
R529 - Brightness control (5 k pot)
R530 - Resistor, 3.3 k 1/4 watt
R990 - Contrast control (10 k pot)
R402 - Horizontal Position control (1 k pot)
R322 - Pincushion control (500 ? pot)
R320 - Vertical Hold control (200 k pot)
VR1 - DPC Dynamic Pincushion Correction control (100 k pot)
VR2 - Horizontal Size (width) control (50 k pot)
Connectors on this board:
P401 goes to P401 on the main board. Wire color sequence is red, black, white, black, white. This connector is wired to the "Horiz Hold" and "Horiz Position" pots.
P302 goes to P302 on the main board. Wire color sequence is black, brown, red, orange, yellow, green, blue, purple, gray, white. This connector is wired to the "Vert Size", "Pincushion", "Vert Position", "Vert Hold", and "Brightness" pots.
P101 goes to VR1 and VR2 connectors on the pincushion board. Wire color sequence is orange, red, brown, black. This connector is wired to the "DPC" and "Horiz Size" pots.
P901 goes to P903 on the neck board. Wire color sequence is brown, red, orange. This connector is wired to the "Contrast" pot.
NOTE: If "F-DPC-001" Dynamic Pincushion Correction board is installed to the side of the main board, these changes should be noted on the remote adjustment board:
R322 - Pincushion pot is not installed.
R323 - Resistor is not installed.
R318 - Resistor is replaced with a wire jumper.
Neckboard Adjustments:
All are vertical mount style with center terminal facing rear and 6mm knob.

R950 - Red Gain (2 k pot)
R951 - Green Gain (2 k pot)
R952 - Blue Gain (2 k pot)
R936 - Blue Cutoff (500 ? pot)
R937 - Green Cutoff (500 ? pot)
R938 - Red Cutoff (500 ? pot)
Manufacturer Contact Information:

Neotec Graphic International, Inc.
2721 N. Towne Avenue
Pomona, Calif. 91767
Phone: (909) 626-9889
Fax: (909) 626-0990
www.neotecgraphic.com
 
chassis neckboard and tube numbers are matching up so i guess i have a neotec nt-2701.
yoke ohm readings ar epretty close so i think i have the correct yoke (its bonded)

however the hot in there is a nte 2331

according to my info i should have a 2sc5150 or a nte 2639


so i have some nt-27XX variation or its the wrong hot.. whatcha think?
 
Either one of those horizontal outs will be fine although the 2639 is rated a little higher at 1700 volts versus the 2331 at 1500 volts.
 
I see your monitor chassis is certainly missing the side metal bracket/heat sink for the horizontal output transistor. That bracket also mounted the pincushion board to it with screws.
 
Looks just like my NT-27E.

If I had to bet.. I would say its a NT27E.

Wayne

If you need the Metal portions.. I have a 25" neotec chassis with the metal frame and heatsink
 
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i made one.. made a bottom part out of a makvision mount... ghetto as hell but this monitor works now.. just no med res game to stuff it into..

the monitor frame has atari games stickrs all over it so im pretty sure it came out of some med res driver or something,.
 
bump from back int he day lol..

this lives in a golden tee 2005 now.

I have one small issue though. The width will not adjust enough.

Is there some other adjustment besides whats on the remote board as far as width goes?

pincushion, brightness etc theyre all working fine, but as max width im still about 1/2" too skinny on each side.

i can adjust the width much skinnier, but just wont get wide enough. going to check that bipolar cap to make sure its not the wrong value or somethng.
 
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slightly adjusted my vertical linearity pot on the chassis itself to even it out on the edge, and then found one pot marked r111 i believe, not listed in the list above, and barely moving that clockwise"grew" my pic enough to be properly adjusted.

i dont know if thats the b+ pot or what, (xray is a different pot) whatever man its got an awesome pic now.
 
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Wow...Ken, you are an amazing resource and I greatly appreciate that! Cadillacman, thanks for reposting that info.

I do have one question thought. I've been trying to ID my Neotec 27" med res. from a SF Rush. I had narrowed it down to 2701 or 27E. Then I saw this thread! The specs listed here look VERY close with 1 exception:

This is a medium (EGA) resolution monitor. Circuit boards are marked as follows: Main board is silkscreened with "PCB-002B" on the foil side. Pincushion board is marked "F-DPC-001". Remote adjustment board is marked "NT-002" on the solder side between connectors P901 and P302. Neck board is marked with both "NT-001A" and "Li Chin" on the parts side of the board.
all the board numbers match up on the main board, pincushion board and remote board... The only exception is that the neckboard shows "NT-001" ..not "NT-001A". So I will assume I have a 2701 where it's so close. I do have the metal plate for the pincushion board and the HOT is on the other side. My monitor beeps when powered so I'm assuming I need to order a new HOT. The only question is, looking at the numbers, my HOT has the following printed on it:

BU
2520AX
PHm 9650
Philippines

Doesn't match any of the other ones listed previously in this thread which doesn't really surprise me, but I guess I just want to confirm I should be able to replace it with the NTE 2639.

Thanks,

Tom

EDIT: It looks as though (as mentioned by Ken when referring to the difference between the 2639 and 2331) that the difference looks like 1700v vs. 1500v as the Bu 2520 AX is a 1500v transistor. I'm going to give it a try and see where it leads me.
 
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