HP A1999A CD ROM: Difference between revisions
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Revision as of 16:17, 29 April 2024
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
| 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
Power Supply
| 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