Product Family Information
The model HP C2021A is identical to the model HP C2001A from a hardware standpoint, as is the model HP C2039A to the model HP C2037A. The models HP C2021A and C2039A printers include the following features:
•PostScript Level 2 SIMM
•AppleTalk MIO Card
•4 MBytes of RAM
In every instance the repair procedures for all products are similar.
Some LaserJet 4 accessories are compatible with the LaserJet 4 Plus and some are not. The compatibility chart below may be used when there is a question of accessory compatibility.
Table | Product Family Compatibility Matrix |
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Accessory |
| Description | Does it work in the | Does it work in the |
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| HPLaserJet 4? | HPLaserJet 4 Plus? |
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C2082A |
| Envelope Feeder | Yes | No |
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C2082B |
| Envelope Feeder | Yes | Yes |
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C2083A |
| Optional 500 Sheet Feeder | Yes | No |
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| Assembly |
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C2083D |
| Optional 500 Sheet Feeder | Yes | Yes |
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| Assembly |
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C2085A |
| 250 Sheet Universal PC | Yes | No |
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| tray |
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C2085D |
| 250 Sheet Universal PC | No | Yes |
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| tray |
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C3129A |
| PostScript SIMM | No | Yes |
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C2080A |
| PostScript SIMM | Yes | No |
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C2063A |
| Memory (1 MByte) | Yes | Yes |
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C2064A |
| Memory (2 MByte) | Yes | Yes |
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C2065A |
| Memory (4 MByte) | Yes | Yes |
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C2066A |
| Memory (8 MByte) | Yes | Yes |
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C3130A * |
| Memory (1 MByte) | No | Yes |
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C3131A * |
| Memory (2 MByte) | No | Yes |
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C3132A* |
| Memory (4 MByte) | No | Yes |
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C3133A* |
| Memory (8 MByte) | No | Yes |
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C3146A * |
| Memory (16 MByte) | No | Yes |
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C3157A |
| Duplex Assembly | No | Yes |
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92298A |
| Toner Cartridge | Yes | Yes |
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*If HP LaserJet 4 Plus Optional Memory (C3130A, C3131A, C3132A, C3133 or C3146A) is installed in the HP LaserJet 4, the printer will display a “53.1X.08 ERROR” (X indicates the position of the SIMMs slot).