Panasonic NV-HS860EG-K Service Manual page 23

PROCEDURES FIP Display
Adjust the Frequency response by pressing the
"2" (increase) and/or "8" (decrease) key on the
Remote Controller. (Refer to Fig.E4)
Spec. SP/LP:0+-1dB(90-110%)
To release Service Mode, "Turn the Shuttle Ring to
FF"*1 and press the EJECT key simultaneously 6
times until it would be a normal indication.
Fig. E6
3.3.6. LOCATION OF TEST POINTS & CONTROLS