View source for Computer Devices Dot

{{WikipediaInfoAlt|The_Dot_(computer)}}
{{DeviceAlerts}}
{{InfoboxDevice
|Picture=Computer Devices Inc. (CDI) Dot portable computer with keyboard and manual.jpg|Release Year = 1983
|Mounting Technology = Through Hole, Sockets
|Capacitor Types = Aluminum Electrolytic, Tantalum, Ceramic
|Leak Risk = Low
|Batteries = Soldered to CPU card
|Destructive Entry = No
|CPU=8088|Storage=3.5in Sony OA-D30V or OA-D31V pre-standard Drives|Input Voltage=120V AC|Power Connector=IEC C13/C14 Socket}}
The Dot by CDI was a portable IBM compatible-ish computer with built in CRT, printer, and 3.5in floppy drive(2).

== Known Issues ==

===Shuts off during use===
====Causes====
*Probably PSU caps are bad
====Solutions====
*Recap PSU

===Horizontal instability in image on CRT===
====Causes====
*Probably CRT analog board caps are bad
====Solutions====
*Recap CRT analog board

== Disassembly Notes ==
There is a '''''very''''' difficult to access screw to the right of the CRT that must be removed to gain full access to CRT analog board. 

== Original Parts ==
=== CRT Analog Board ===
''Sanyo, DK7459NL''<gallery>
File:CDIDot-CRTAnalogBoard.jpg
</gallery>Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
{| class="wikitable sortable"
!RefDes
!Qty
!Capacitance
!Voltage
![https://caps.wiki/wiki/Part_Footprints Mount]
!Diameter/Size
!Height
!Lead Spacing
!Temp
![https://caps.wiki/wiki/Capacitor_Types Type]
!Brand
!Series
|-
|C512
|1
|2200 µF
|10 V
|Through Hole
|16mm
|24mm
|8mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|[[Capacitor Series#TWSS|CE W]]
M 129
|-
|C620
|1
|1000 µF
|35 V
|Through Hole
|16mm
|24mm
|8mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|CE W
M 32
|-
|C607, C509
|2
|4.7 µF
|25 V
|Through Hole
|5mm
|12mm
|5mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|CE W
M 321
|-
|C673
|1
|22 µF
|16 V
|Through Hole
|5mm
|12mm
|5mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|CE W
M 13
|-
|C504, C502
|2
|10 µF
|16 V
|Through Hole
|5mm
|12mm
|5mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|CE W
M 207
|-
|C505
|1
|33 µF
|16 V
|Through Hole
|5mm
|12mm
|5mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|CE W
M 47
|-
|C510
|1
|1 µF
|25 V
|Through Hole
|5mm
|12mm
|5mm
|85 °C
|Aluminum Electrolytic
|Sanyo
|C 27
|-
|C501
|1
|2.2 µF
|50 V
|Through Hole
|5mm
|12mm
|5mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|CE W
M 156
|-
|C656
|1
|22 µF
|25 V
|Through Hole
|5mm
|12mm
|5mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|CE W
M 17
|-
|C511
|1
|4.7 µF
|25 V
|Through Hole
|8mm
|12mm
|5mm
|85 °C
|Aluminum Electrolytic
|Sanyo
|O.E 28
|-
|C506, C508, C606
|3
|220 µF
|16 V
|Through Hole
|10mm
|12mm
|5mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|CE W
M 442
|-
|C210
|1
|100 µF
|100 V
|Through Hole
|13mm
|20mm
|5mm
|85 °C
|Aluminum Electrolytic
|Nichicon
|SE (M)
|-
|C652, C651
|2
|10 µF
|160 V
|Through Hole
|10mm
|15mm
|5mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|CE W
M 172
|-
|C612
|1
|470 µF
|25 V
|Through Hole
|10mm
|20mm
|5mm
|85 °C
|Aluminum Electrolytic
|Rubycon
|CE W
M 172
|-
|C621
|1
|4.7 µF
|50 V
|Through Hole
|18mm
|32mm
|7mm
|85 °C
|Non-Polar Aluminum Electrolytic
|Rubycon
|[[Capacitor Series#HD 2|H. D.]]
|}
{| class="wikitable"
|+Integrated Circuits
!RefDes
!Qty
!Model Number/Part Number
!Manufacturer (If Applicable)
!Explanation
!Datasheet
|-
|
|1
|HD74LS123P
|Hitachi
|Monostable Multivibrator
|[https://www.ti.com/lit/ds/symlink/sn74ls122.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1758310968137&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fsn74ls122 SN74LS123]
|}

===PSU Board===
''0002-14506, D51274, Rev C, 22-3-3285''<gallery>
File:CDIDot-PSUBoard.jpg
</gallery>
{| class="wikitable sortable"
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
!RefDes
!Qty
!Capacitance
!Voltage
![https://caps.wiki/wiki/Part_Footprints Mount]
!Diameter/Size
!Height
!Lead Spacing
!Temp
![https://caps.wiki/wiki/Capacitor_Types Type]
!Brand
!Series
|-
|C16, C20
|2
|470 µF
|200 V
|Through Hole
|25mm
|56mm
|10mm
|85 °C
|Aluminum Elecytolytic
|Marcon
|HPW-N
|-
|C19, C2
|2
|220 µF
|35 V
|Through Hole
|10mm
|20mm
|5mm
|85 °C
|Aluminum Elecytolytic
|ic
|RARA
|-
|C12
|1
|4.7 µF
|50 V
|Through Hole
|4mm
|8mm
|5mm
|105 °C
|Aluminum Elecytolytic
|Qunio
|GR
|-
|C3, C23, C24, C25
|4
|2200 µF
|35 V
|Through Hole
|18mm
|36mm
|10mm
|105 °C
|Aluminum Elecytolytic
|Marcon
|CE-US
|-
|C18
|1
|470 µF
|16 V
|Through Hole
|10mm
|20mm
|5mm
|105 °C
|Aluminum Elecytolytic
|Marcon
|CE-US
|-
|C15
|1
|33 µF
|16 V
|Through Hole
|5mm
|8mm
|5mm
|85 °C
|Aluminum Electrolytic
|Panasonic
|S
|}
{| class="wikitable"
|+Integrated Circuits
!RefDes
!Qty
!Model Number/Part Number
!Manufacturer (If Applicable)
!Explanation
!Datasheet
|-
|
|2
|LM339N
|National Semiconductor
|Quad Differential Comparators
|[https://www.ti.com/lit/ds/symlink/lm339.pdf LM339]
|-
|
|1
|LM358N
|National Semiconductor
|Low Power Dual OpAmp
|[https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Flm158-n LMx58]
|-
|
|1
|SG3549
|
|Current Sense Latch
|[https://ww1.microchip.com/downloads/en/DeviceDoc/sg1549_v1_2.pdf SG3549]
|}

===Q160 Logic Board===
''28-3-7097''
{| class="wikitable sortable"
|+Capacitor [[Capacitor Specifications|Specifications]] and  [[Part Footprints|Footprint]] Information
!RefDes
!Qty
!Capacitance
!Voltage
![https://caps.wiki/wiki/Part_Footprints Mount]
!Diameter/Size
!Height
!Lead Spacing
!Temp
![https://caps.wiki/wiki/Capacitor_Types Type]
!Brand
!Series
|-
|
|3
|15 µF
|35V
|Through Hole
|5mm
|8mm
|5mm
|85 °C
|Aluminum Electrolytic
|IC
|
|}

==Replacement Parts==

=== CRT Analog Board ===
{| class="wikitable sortable"
|+Capacitors
! RefDes
! Qty
! Compatible Part Number
! Order Links
|-
|C512
|1
|EKZH250ELL222ML20S
|[https://www.digikey.com/en/products/detail/chemi-con/EKZH250ELL222ML20S/21805497 Digikey]
|-
|C620
|1
|35WXA1000MEFC16X16
|[https://www.digikey.com/en/products/detail/rubycon/35WXA1000MEFC16X16/3564338?s=N4IgTCBcDaIMwFYDqANAggRgAw4LIFEAxAYQwDYVyQBdAXyA Digikey]
|-
|C607, C509
|2
|UVR1V4R7MDD1TA
|[https://www.digikey.com/en/products/detail/nichicon/UVR1V4R7MDD1TA/4995365?_gl=1*1wh3j4f*_up*MQ..*_gs*MQ..&gclid=Cj0KCQjwovPGBhDxARIsAFhgkwQfpKotBSP48JtKOUedGWf9bBHHZ3B9KrzbBUIdj833wqPm6fMKTj8aAnsDEALw_wcB&gclsrc=aw.ds Digikey]
|-
|C673
|1
|UVR1C220MDD1TA
|[https://www.digikey.com/en/products/result?keywords=UVR1C220MDD1TA Digikey]
|-
|C504, C502
|2
|ECA-1EM100B
|[https://www.digikey.com/en/products/result?keywords=ECA-1EM100B Digikey]
|-
|C505
|1
|ECA-1CM330B
|[https://www.digikey.com/en/products/result?keywords=ECA-1CM330B Digikey]
|-
|C510
|1
|UPX1V010MPD
|[https://www.digikey.com/en/products/result?keywords=UPX1V010MPD Digikey]
|-
|C501
|1
|50YXJ2R2MTA5X11
|[https://www.digikey.com/en/products/result?keywords=50YXJ2R2MTA5X11 Digikey]
|-
|C656
|1
|50YXJ22MTA5X11
|[https://www.digikey.com/en/products/result?keywords=50YXJ22MTA5X11 Digikey]
|-
|C511
|1
|UVR1V4R7MDD1TA
|[https://www.digikey.com/en/products/detail/nichicon/UVR1V4R7MDD1TA/4995365?_gl=1*1wh3j4f*_up*MQ..*_gs*MQ..&gclid=Cj0KCQjwovPGBhDxARIsAFhgkwQfpKotBSP48JtKOUedGWf9bBHHZ3B9KrzbBUIdj833wqPm6fMKTj8aAnsDEALw_wcB&gclsrc=aw.ds Digikey]
|-
|C506, C508, C606
|3
|EEU-FR1C221B
|[https://www.digikey.com/en/products/result?keywords=EEU-FR1C221B Digikey]
|-
|C210
|1
|100YXJ100MT810X20
|[https://www.digikey.com/en/products/result?keywords=100YXJ100MT810X20 Digikey]
|-
|C652, C651
|2
|UPS2C100MPD1TD
|[https://www.digikey.com/en/products/result?keywords=UPS2C100MPD1TD Digikey]
|-
|C612
|1
|25YXG470MEFCT810X16
|[https://www.digikey.com/en/products/result?keywords=25YXG470MEFCT810X16 Digikey]
|}
{| class="wikitable sortable"
|+
CRT Horizontal Deflection Capacitor
!RefDes
!Qty
!Compatible Part Number
!Notes
|-
|C621
|2
|UVP1A472MHD or ECE-A0JN682U
|WARNING: There is no suitable replacement for the original capacitor. The original rated ripple current is not matched by any currently produced capacitors.


The best recommendation I have is to put two of the stated capacitors here in parallel to attempt to get enough ripple current endurance. But this is UNTESTED. 
|}
{| class="wikitable sortable"
|+Integrated Circuits
!RefDes
!Qty
!Compatible Part Number
!Order Links
|-
|
|1
|SN74LS123N
|[https://www.digikey.com/en/products/detail/texas-instruments/SN74LS123N/277282 DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS123N?qs=aZHVzqKrScD3CF1KN0ae4Q%3D%3D Mouser] [https://www.lcsc.com/product-detail/C22449639.html?s_z=n_SN74LS123N LCSC]
|}

=== PSU Board ===
{| class="wikitable sortable"
|+Capacitors
! RefDes
! Qty
! Compatible Part Number
! Order Links
|-
|C16, C20
|2
|LGU2D471MELZ
|[https://www.digikey.com/en/products/result?keywords=LGU2D471MELZ Digikey]
|-
|C19, C2
|2
|UVZ1V221MPD1TD
|[https://www.digikey.com/en/products/result?keywords=UVZ1V221MPD1TD Digikey]
|-
|C12
|1
|UPS1J4R7MDD1TA
|[https://www.digikey.com/en/products/result?keywords=UPS1J4R7MDD1TA Digikey]
|-
|C3, C23, C24, C25
|4
|50MXG2200MEFCSN20X25
|[https://www.digikey.com/en/products/result?keywords=50MXG2200MEFCSN20X25 Digikey]
|-
|C18
|1
|UVZ1C471MPD1TA
|[https://www.digikey.com/en/products/result?keywords= Digikey]
|-
|C15
|1
|EEU-FR1V330B
|[https://www.digikey.com/en/products/result?keywords=EEU-FR1V330B Digikey]
|}
{| class="wikitable sortable"
|+Integrated Circuits
!RefDes
!Qty
!Compatible Part Number
!Order Links
|-
|
|2
|LM339N
|[https://www.digikey.com/en/products/detail/texas-instruments/LM339N/277628 DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/LM339N?qs=rshUhwi3fbY%252BaR%252BOl3edNw%3D%3D Mouser] [https://www.lcsc.com/product-detail/C725324.html?s_z=n_LM339N LCSC]
|-
|
|1
|LM358N/NOPB
|[https://www.digikey.com/en/products/detail/texas-instruments/LM358N-NOPB/6264?s=N4IgjCBcoLQExVAYygFwE4FcCmAaEA9lANogCsIAugL74wCciIKkGO%2BRkpENtICXEABsAtgGYyADgB2VakA DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/LM358N-NOPB?qs=QbsRYf82W3GXbWt%2FvwDTcQ%3D%3D Mouser] [https://www.lcsc.com/product-detail/C83405.html?s_z=n_LM358N LCSC]
|}

=== Q160 Logic Board ===
{| class="wikitable sortable"
|+Capacitors
! RefDes
! Qty
! Compatible Part Number
! Order Links
|-
|
|3
|EEA-GA1H150B
|[https://www.digikey.com/en/products/result?keywords=EEA-GA1H150B Digikey]
|}
''If parts are not available or different selection is preferred, you can use the values in the [[#Original_Parts|Original Parts]] section to perform a parametric search.''

===Kits===
* Digikey BOM: https://www.digikey.com/

== Related Links ==

* [https://www.youtube.com Videos or other things that might be helpful to check out]

== References ==
<references />
[[Category:WorkNeeded:OriginalParts]]
[[Category:WorkNeeded:ReplacementParts]]