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Good quality, the manual help me to repair the echo/reverb section
Text excerpt from page 6 (click to view)
MEGA BASS UNIT
Note for installation: Check that two switches are latched with dolby knob and M/B knob when carrying out installation of the mega bass unit.
2 stopper
1 two knobs (rotary)
dolby knob M/B knob
3 two claws
A 5 flexible board
two switches
4 Remove the mega bass unit to direction of the arrow A.
3 three claws
DIAL POINTER SETTING
Note: Follow the assembly procedure in the numerical order given.
pointer
guide rib
fig. A
2 Mount the pointer as shown in the figure A.
1 Turn the knob (TUNE) fully in the arrow direction.