HP 7475A Plotter: Difference between revisions

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(→‎Replacement Parts: Added ICs to Original Parts List)
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|SE (M)
|SE (M)
|}
|}
{| class="wikitable"
|+Active Components
!RefDes
!Qty
!Part Number/Model Number
!Manufacturer (If Applicable)
!Explanation
!Datasheet
|-
|U2, U8
|2
|SN75447P
|Texas Instruments
|Dual Peripheral Driver
|[https://download.datasheets.com/pdfs/2008/04/13/urlc/txn/sn75446.pdf 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
|[https://digchip.com/datasheets/download_datasheet.php?id=2065465&part-number=MC3447P 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
|[https://www.ti.com/lit/ds/symlink/sn74ls174.pdf?ts=1740261144865&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FSN74LS174 SN74LS174]
|-
|U18
|1
|1820-2274
|Motorola
|
|
|-
|U19
|1
|1820-1438
|Motorola
|
|
|-
|U21
|1
|SN74LS04N
|Texas Instruments
|Hex Inverter
|[https://www.ti.com/lit/ds/symlink/sn74ls04.pdf SN74LS04]
|-
|U22
|1
|74LS10N
|Signetics
|Triple 3-Input Positive-NAND Gates
|[https://www.ti.com/lit/ds/symlink/sn74ls10.pdf?ts=1740343959540&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FSN74LS10%253Fbm-verify%253DAAQAAAAK_____5OkPfsoktFPUCSWBg9b1g__UmyAa6EsbozqsnUgMkjF4Kjsc7TZOFKhyln4uITfJQusK044n6VqpVtyxNWXKBX9hZKjPlfaCcQ1nWi-pSRkV1sgMPqB-pixK-VU0592ByB-0eEnUI77F4mr4oCpoFg4Ig3mSASyI0MmomkZI-Ds-qv24w1uj5OjVXVHBX52uY9wwmyYQ8cEffixUMpFHzKVhX0E2hl5lP9CNRxqqEejAyXSFhR30x5W9rHd SN74LS10]
|-
|Q9
|1
|2N3791
|Motorola
|PNP High-Power Transistor
|[https://ww1.microchip.com/downloads/aemDocuments/documents/HRDS/ProductDocuments/DataSheets/2N3791-2N3792-MIL-PRF-19500-379.PDF SN3791]
|}
==Replacement Parts==
==Replacement Parts==
===Main Logic Board===
===Main Logic Board===
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|C24
|C24
|1
|1
|25PK6800MEFC16X31.5
|25PK6800MEFC16X31.5 / 50YXF22MEFCTA5X11
|[https://www.digikey.com/en/products/detail/rubycon/25PK6800MEFC16X31-5/3134177 DigiKey] [https://www.mouser.com/ProductDetail/Rubycon/25PK6800MEFC16X31.5?qs=T3oQrply3y8rd0sIOTQqeQ%3D%3D Mouser]
|[https://www.digikey.com/en/products/detail/rubycon/25PK6800MEFC16X31-5/3134177 DigiKey] [https://www.mouser.com/ProductDetail/Rubycon/25PK6800MEFC16X31.5?qs=T3oQrply3y8rd0sIOTQqeQ%3D%3D Mouser] [https://www.lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Leaded_Rubycon-50YXF22MEFCTA5X11_C365695.html LCSC]
|-
|-
|C31, C32
|C31, C32
|2
|2
|860160674016
|860160674016 / 50YXF47MEFCT16.3X11
|[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.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]
|}
|}
''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''

Revision as of 20:54, 23 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

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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