According to the Local Democracy Reporting Service, the sergeant admitted using the corner of a picture frame to weigh down the keys so her computer would not go into sleep mode.
The hearing was told this allowed her to monitor calls on a separate screen during a time in which she suffered challenges in her personal life.
Sgt X said she was in fear of her position and accused a supervisor of wanting to remove her from the department.
But barrister Mark Ley-Morgan, representing the constabulary, said there was no evidence of this.
He told the misconduct panel: “If, as she claims, she was at all times working, she would have had no need to place a picture frame on the keyboard.
“The raw data shows she was not doing anything in the periods she was key-jamming.”
He added: “She chose to take the dishonest route.”
Ley-Morgan said further research during the investigation uncovered Sgt X had been weighing down keys as far back as November 2022 and throughout 2023.