Super manual it contains all the things you need to service your Marantz 2100.
Text excerpt from page 4 (click to view)
2. LINE DRAWING
2-1. FRONT SIDE
AKF-3825 BASIC
- Partial detachable - 2 x 7W - Remote control - Auto stop deck mechanism - Electronic volume control - Loudness - Local / DX
AKF-8825 BASIC
- Partial detachable - 2 x 7W - Remote control - Auto reverse - Electronic volume control - Loudness - Local / DX
AKF-8825 RDS
- Partial detachable - 4 x 7W - RDS (AF, PTY, EON, TA) - Auto reverse deck mechanism - Remote control - Electronic volume control - Loudness - Local / DX