Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this receiver.
Text excerpt from page 6 (click to view)
Removing the Cassette mechanism assembly (See Fig.8)
1. Remove the front chassis. 2. Remove the bottom cover. 3. Remove the main amplifier board assembly. 4. Remove the fore screws F attaching the cassette mechanism assembly from the top cover.
Cassette mechanism assembly
Removing the control switch board
(See Fig.9 and 10 ) 1. Remove the front panel unit from the main body. 2. Remove the four screws G attaching the rear cover on the back of the front panel unit. 3. Remove the control switch board from the front panel unit.