Nakamichi Cassette Deck 1.5 problem

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My deck has begun to produce a low-level crackling sound from the right channel when playing back type 1 tapes. Tape types 2 & 4 are fine. I had optimistically hoped that it might be something to do with the tape type selector switches, but spraying these with contact cleaner has made no improvement. I can see no signs of bad solder joints, and the mass of internal interconnections seem to be secure. Can anyone offer any suggestions please?
 
casseet deck 1.5 ...

er, the obvious:
  • clean the head with a soft swab and at least 90% isopropyl alcohol, or acetone (but be careful with acetone because it will melt plastic!)
  • beg, borrow or steal (or even purchase a head demagnetizer)
  • clean all switches in the circuit using electrical contact cleaner
if the problem persists, try re-flowing the solder...

peace

stew
 
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