Service manual for Keysight 654xA, 655xA, 664xA, and 665xA GPIB DC power supplies, covering safety, verification, troubleshooting, and repair.
This service manual provides detailed information for troubleshooting, repair, and calibration of Keysight 654xA, 655xA, 664xA, and 665xA GPIB DC power supplies. It includes safety considerations, verification procedures, disassembly instructions, circuit diagrams, and parts lists.
The document also describes firmware revisions, ESD precautions, warranty terms, and model‑specific conventions. It is intended for service‑trained personnel who need to maintain or restore these instruments to their original specifications.
| Power rating (200 W models) | 200 W |
|---|---|
| Power rating (500 W models) | 500 W |
| Safety class | Safety Class 1 |
| Interface | GPIB (for 664xA/665xA models) |
| Firmware location | Front panel board ROM (A3U4) and main board microprocessor (AlU504) |
Use the “*IDN?” query as described in Chapter 3 to obtain the firmware revision numbers.
A “4” in the third position denotes a 200 W supply, while a “5” in the third position denotes a 500 W supply.