HP Designjet T730 Main PCA Board
Different lot number part numbers reference the same F9A30-67001 or F9A28-67020
I've had service calls on several T730 with similar error codes. The last one was BA7E70E6. The 'B' codes harkens back to the day when I routinely saw this type of error on the old 1050c\ 1055cm models. I used to tell customers you have the 'error code of death'. In more technical terms, the Main PCA Board has a defective chip or routine call somewhere on it and needs to be replaced. Replacing the board has resolved the error for me.
The Main PCA is located on the left-hand side of the printer. This board is the 'brain' of the printer: where all the processing and printer management occurs; control of the overall machine (digital and mechatronics) with the battery for Real-Time clock. Single function and Multifunction versions share the same Main PCA. Memory size is 1 GB.
The Main PCA also contains other elements with the following functions:
Battery: to maintain the internal clock running. The internal clock is used to remember the actual date, used for cartridge life counting and warranty accounting.
WiFi module: Attached to the top of the board with some plastic locators, provides WiFi functionality to the printer.
Buzzer: To provide acoustic signals to the user.