[ms660]

If the amplitude of the pilot tone at point 83 is sufficient, the next test I would do would be to monitor the DC voltage with the 'scope set to DC between the Emitter and Collector of T603, when the recorded track is playing it should be approx 18 volts and at the end of the track during the two second pilot tone the voltage should fall to very low.

A brief explanation so far as I can make out from pilot tone detection through to rewind.

Note: In the schematic the relay and solenoid contacts are shown in the rest position.

When working normally in play, contacts rx6 & rx7 of relay RX are closed, contacts rx8 & rx9 are open, when the voltage between the Collector and Emitter of T603 goes low due to the detection of the pilot tone the relay Rls601 is energized and it's contacts open, that disconnects the power to the energizing coil of relay RX and contact rx6 breaks from rx7 and makes with contact rx5, that results in relay R being energized, amongst other things that results in contacts v6 & v7 of relay V opening which causes the tape drive idler solenoid KMV to be de-energized causing it's contacts kmv2 & kmv3 to make while at the same time, due to solenoid KMV being de-energized, the tape drive idler is released. Meanwhile, getting back to relay RX, contacts rx8 & rx9 of relay RX close, thus energizing relay RH which results in the contacts rh7 & rh6 of relay RX being closed, that in turn causes solenoid KMR to be energized, thus bringing the rubber drive wheel on the rewind motor into contact with the rim of the tape supply spool and the tape is rewound (fast) The motor is turned on by contacts kmr4 & kmr5 of solenoid KMR.

Any errors then guilty as charged.

Lawrence.