Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this receiver.
Text excerpt from page 4 (click to view)
TO REPLACE THE BATTERY
To replace the batteries 1. Loosen the screw on the back of the SF unit that holds the battery compartment cover in place, and remove the cover.
Caution In the next step, be sure to remove only one battery at a time. Otherwise, you will lose all data stored in memory. 2. Loosen the screw that secures one of the three battery holders in place and remove the battery holder. Replace the old battery with a new one, making sure that the positive (+) side of the new battery is facing up (so you can see it). Replace the battery holder and secure it by tightening its screw. Screw
RESET
3.
+
4.
TO CHECK THE MEMORY CAPACITY
Hold down CAPA to display a screen that shows the current memory status. To clear the memory status display, release CAPA .
C A PA C IT Y Remaining memory capacity FREE USED 76420Bytes 27016Bytes
