HP 7475A Plotter: Difference between revisions

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

Latest revision as of 01:35, 26 February 2025

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

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.

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.

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

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
U17	1	SN74LS174N / SN74LS174N(LX)	DigiKey Mouser LCSC
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

@@ Line 270: / Line 270: @@
 !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
@@ Line 325: / Line 275: @@
 |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