Read Harman Kardon HK 3770 (serv.man8) Service Manual online
8.
VFD will display followings after dispaying "UPGRADE SUCCESS".
VFD 1st line : FM 87.50 01
VFD 2nd line : 2 CH STEREO
VFD 2nd line : 2 CH STEREO
Harman Kardon
HK 3770 Service Manual
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