Samsung QA75QN800CKXXL E-Manual page 161

Connecting the "CI or CI+ Card"
Connect the "CI or CI+ Card" to the COMMON INTERFACE slot as shown in the image below.
Connecting the "CI or CI+ Card" via COMMON INTERFACE slot
Only for models with Common interface slot.
Connect the "CI or CI+ Card" to the COMMON INTERFACE slot as shown in the image below.
- 161 -