We got very sick baby here, looks like it had quite a fall or tumble. Main board is cracked in few places. Lets investigate and work on it to fix it to its former glory
Specs
Type: 2-head, single compact cassette deck
Track System: 4-track, 2-channel stereo
Tape Speed: 4.75 cm/s
Heads: 1 x record/playback, 1 x erase
Motor: 1 x capstan, 1 x reel
Tape Type: type I, FeCr, CrO2, Metal
Noise Reduction: B, C
Headroom Extension: HX Pro
Videos
Part 1 of the repair
Photos
Beautiful Harman Kardon hk300xmHarman Kardon hk300xm inside top viewHarman Kardon hk300xm inside main board viewHarman Kardon hk300xm inside powersupply boardHarman Kardon hk300xm inside powersupply and control boardsHarman Kardon hk300xm inside tape mech and control boardHarman Kardon hk300xm inside tape mech and control board motor speed adjustmentHarman Kardon hk300xm inside level adjustmentHarman Kardon HK300XM crack in the main boardHarman Kardon HK300XM crack in the main board bottom sideHarman Kardon HK300XM crack in the main board bottom side near relaysHarman Kardon HK300XM crack in the main board bottom side near relaysHarman Kardon HK300XM inside control board close up