HP 7475A Plotter: Difference between revisions

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|[https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/860160674016/5727824 Digikey] [https://www.mouser.com/ProductDetail/Wurth-Elektronik/860160674016?qs=0KOYDY2FL2%252BLy32GPJkj0A%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-50YXF47MEFCT16-3X11_C432345.html LCSC]
|[https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/860160674016/5727824 Digikey] [https://www.mouser.com/ProductDetail/Wurth-Elektronik/860160674016?qs=0KOYDY2FL2%252BLy32GPJkj0A%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-50YXF47MEFCT16-3X11_C432345.html LCSC]
|}
|}
{| class="wikitable sortable"
|+Active Components
!RefDes
!Qty
!Compatible Part Number
!Order Links
|-
|U2, U8
|2
|
|DigiKey Mouser LCSC
|-
|U5
|1
|
|DigiKey Mouser LCSC
|-
|U6
|1
|
|DigiKey Mouser LCSC
|-
|U7
|1
|
|DigiKey Mouser LCSC
|-
|U9
|
|
|DigiKey Mouser LCSC
|-
|U10
|2
|
|
|-
|U12
|1
|
|
|-
|U13
|1
|
|
|-
|U14
|1
|
|
|-
|U15
|1
|
|
|-
|U17
|1
|SN74LS174N / SN74LS174N(LX)
|[https://www.digikey.com/en/products/detail/texas-instruments/SN74LS174N/377793 DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS174N?qs=WzgTT80quPHZ%2FqeW32KAcw%3D%3D Mouser] [https://www.lcsc.com/product-detail/Flip-Flops_lingxingic-SN74LS174N-LX_C22449625.html?s_z=n_SN74LS174N LCSC]
|-
|U18
|1
|
|
|-
|U19
|1
|
|
|-
|U21
|1
|SN74LS04N / SN74LS04N(XBLW)
|[https://www.digikey.com/en/products/detail/texas-instruments/SN74LS04N/277275 DigiKey] Mouser [https://www.lcsc.com/product-detail/Inverters_XBLW-SN74LS04N-XBLW_C42395516.html?s_z=n_SN74LS04N LCSC]
|-
|U22
|1
|SN74LS10N / SN74LS10N(XBLW)
|[https://www.digikey.com/en/products/detail/texas-instruments/SN74LS10N/277280 DigiKey] [https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS10N?qs=fvkeCqCHl3ByD1saAdESqA%3D%3D Mouser] [https://www.lcsc.com/product-detail/Logic-Gates_XBLW-SN74LS10N-XBLW_C42395508.html?s_z=n_74LS10N LCSC]
|-
|Q9
|1
|2N3792 PBFREE / 2N3791
|[https://www.digikey.com/en/products/detail/central-semiconductor-corp/2N3792-PBFREE/4807606 DigiKey] [https://www.mouser.com/ProductDetail/Microchip-Technology/2N3791?qs=TXMzd3F6Eym8M0G3OdytqA%3D%3D Mouser]
|}
''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''
''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''
==References==
==References==
<references />
<references />
[[Category:Computer Plotter]]
[[Category:Computer Plotter]]
[[Category:1980s]]
[[Category:1980s]]

Revision as of 18:05, 24 February 2025

HP 7475A Plotter
Preliminary Information
Leak Risk Medium
Batteries None
Mounting Technology Through Hole
Capacitor Types Aluminum Electrolytic, Tantalum, Ceramic
Destructive Entry No

HP plotter with HP-IB (GP-IB) interface. Hold 6 pens in carousel.

Known Issues

Fish Smell

Causes

  • Leaking capacitor
  • Leaking cap visible on logic board with electrolyte seeping up the jacket

    Leaking cap visible on logic board with electrolyte seeping up the jacket

  • Sprague brand capacitor that has leaked and formed a powder moving up into the jacket of the capacitor.

    Sprague brand capacitor that has leaked and formed a powder moving up into the jacket of the capacitor.

Solutions

  • Clean PCB and replace cap

Disassembly Notes

Screws in rear from top removes plastic shell.

Two screws going through plot mechanism and PCB hold both in. HP-IB port screws must also be removed to remove PCB.

Original Parts

Main logic board

07475-60102

Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Height Lead Spacing Temp Type Brand Series
C1 1 68 µF 35V Through Hole 10mm 20mm 5mm -55-105 °C Aluminum Electrolytic Nippon Chemi-Con CERX
C2 1 2,200 µF 40V Through Hole (3 pin) 25mm 67mm 9.5mm Aluminum Electrolytic Sprague 674D
C24 1 6,800 µF 25V Through Hole (3 pin) 25mm 39mm 12mm 85°C Aluminum Electrolytic Nippon Chemi-Con SM
C20, C25 2 22 µF 25V Through Hole Axial 6mm 13mm 20mm 85°C Aluminum Electrolytic Nichicon H8333 ?
C31, C32 2 47 µF 50V Through Hole 8mm 12mm 3.5mm 85°C Aluminum Electrolytic Nichicon SE (M)
Active Components
RefDes Qty Part Number/Model Number Manufacturer (If Applicable) Explanation Datasheet
U2, U8 2 SN75447P Texas Instruments Dual Peripheral Driver SN75447
U5 1 8343MDC AMI
U6 1 8323MAL AMI
U7 1 SP8344+ National Semiconductor
U9 1826-0138 Motorola
U10 2 MC3447P Motorola Bidirectional Bus Transciever MC3447
U12 1 1820-2219 Motorola
U13 1 1820-2099 Motorola
U14 1 AM9265BPC AMD
U15 1 CN65004N Signetics
U17 1 SN74LS174N Texas Instruments Hex/Quad D-Type Flip-Flops SN74LS174
U18 1 1820-2274 Motorola
U19 1 1820-1438 Motorola
U21 1 SN74LS04N Texas Instruments Hex Inverter SN74LS04
U22 1 74LS10N Signetics Triple 3-Input Positive-NAND Gates SN74LS10
Q9 1 2N3791 Motorola PNP High-Power Transistor SN3791

Replacement Parts

Main Logic Board

Capacitors
RefDes Qty Compatible Part Number Order Links
C1 1 EEU-FR1V680B Digikey Mouser
C2 1 UPM1H222MHD Digikey Mouser
C20, C25 2 500D226M025BA2A Digikey Mouser
C24 1 25PK6800MEFC16X31.5 / 50YXF22MEFCTA5X11 DigiKey Mouser LCSC
C31, C32 2 860160674016 / 50YXF47MEFCT16.3X11 Digikey Mouser LCSC
Active Components
RefDes Qty Compatible Part Number Order Links
U2, U8 2 DigiKey Mouser LCSC
U5 1 DigiKey Mouser LCSC
U6 1 DigiKey Mouser LCSC
U7 1 DigiKey Mouser LCSC
U9 DigiKey Mouser LCSC
U10 2
U12 1
U13 1
U14 1
U15 1
U17 1 SN74LS174N / SN74LS174N(LX) DigiKey Mouser LCSC
U18 1
U19 1
U21 1 SN74LS04N / SN74LS04N(XBLW) DigiKey Mouser LCSC
U22 1 SN74LS10N / SN74LS10N(XBLW) DigiKey Mouser LCSC
Q9 1 2N3792 PBFREE / 2N3791 DigiKey Mouser


If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search

References

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