HP A1999A CD ROM

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External SCSI CD ROM. 2 different CD ROM drives were used depending on manufacture date.

HP A1999A CD ROM
Preliminary Information
Release Year 1992
Leak Risk High
Batteries None
Mounting Technology Through Hole, Snap In, Surface Mount
Capacitor Types Electrolytic
Destructive Entry No


Known Issues

Power Supply Nonfunctional

Causes

  • Leaking electrolytic capacitors

Solutions

  • Replace all electrolytic capacitors in power supply

Disassembly Notes

Plastic ring that leads to CD ROM SCSI ID jumpers may be removed by removing back panel if replacement of CD ROM is needed.

Original Parts

Power Supply

Capacitor Specifications and Footprint Information
RefDes Qty Capacitance Voltage Mount Diameter/Size Height Lead Spacing Temp Type Brand Series
C7 1 100 µF 400 Snap In 25.5 25.5 10 85 °C Electrolytic Nippon Chemicon SMG
C8 1 22 µF 25 Through Hole 5.5 12 2 85 °C Electrolytic Nippon Chemicon SM
C17, C18 2 1000 µF 16 Through Hole 12.5 25 5 85 °C Electrolytic Nippon Chemicon SM
C19, C20, C24 3 330 µF 25 Through Hole 8 19 4 105 °C Electrolytic Nippon Chemicon SM

Replacement Parts

Basic PCB Name

Capacitors
RefDes Qty Compatible Part Number Order Links
C7 1 493-2785-ND Digikey
C8 1 493-14482-ND Digikey
C17, C18 2 493-1526-ND Digikey
C19, C20, C24 3 493-1550-ND Digikey

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.

Related Links

HP A1999A CD ROM on HP Computer Museum

References