APPENDIX ‘C’
Changing FM De-emphasis
Preparation
1. Make sure the power cord is disconnected from the tuner’s power inlet connector on the rear panel of the tuner.
2. Start with the tuner sitting on its feet with its faceplate facing you.
3. Remove the 4 screws from the tuner chassis top cover (2 screws each side).
4. Remove the top cover by lifting it straight up.
5. Place a handtowel or cloth over the faceplate to guard against accidental scratching.
Changing from 75 microseconds (North America) to 50 microseconds (Europe et al)
Looking towards the middle of the main circuit board locate the two, green, polypropolyene capacitors marked “C16” and C18”. They will be located right behind the
blue trimpot labelled “Stereo Multiplex Adjust”.
If your FT-1 is expected to remain in the country for which it s being, carry out the following procedure.
- With a small pair of electronics sidecuting pliers, snip the right and left leg of C16 at the circuit board and remove from the chassis. Do the same with C18.
If it is possible the FT-1 may be moved from the country in which this change is taking plae and will be brought back to North America, you have the option of making
the procedure reversible by doing the following.
IF you are planning to return the FT-1 to the USA or Canada
- Instead of removing C16 and C18 from the circvuit, you may cut the inside legs halfway between the capacitor body and the circuit board (C16-right and C18-left)
and fold each capacity over on its connected leg so that the side of the capacitor is parallel with the circuit board. Doing so does not in any way affect the rf circuit.
When the action must be reversed simply bend the capacitor carefully back into place and solder-tack the legs that were cut back into their original position.
Page 18
