SERVICE PARTS SERIES 400 MIXER
| CHANNEL | FUNCT. | POTENTIOMETER | KNOB | CAP | MISC. |
| MIC/LINE | GAIN | 22KB/10300109 | Black/10450193 | Red/10450152 | n.a. |
| REMIX | SwitchAlps/10550400 | Red/10450302 | n.a. | n.a. | |
| HIGH | 100KLIN/10300113 | Black/10450193 | Green/10450194 | n.a. | |
| MID | 100KLIN/10300113 | Black/10450193 | Green/10450194 | n.a. | |
| LOW | 100KLIN/10300113 | Black/10450193 | Green/10450194 | n.a. | |
| SYNC | SwitchAlps/10550400 | Red/10450302 | n.a. | n.a. | |
| AUX1/3 | not available anymore | Black/10450193 | Gray/10450195 | n.a. | |
| AUX2/4 | not available anymore | Black/10450193 | Gray/10450195 | n.a. | |
| Post | SwitchAlps/10550400 | Gray/10450300 | n.a. | n.a. | |
| 1/3-2/4 | SwitchAlps/10550400 | Gray/10450300 | n.a. | n.a. | |
| PANPOT | 10KLIN/10300103 | Black/10450193 | Gray/10450195 | n.a. | |
| Master | SwitchAlps/10550400 | Gray/10450300 | n.a. | n.a. | |
| SOLO | SwitchAlps/10550400 | Gray/10450300 | n.a. | n.a. | |
| Alternative | FADER | 100mm JP/10300089 | Black/10450088 | n.a. | n.a. |
| IC's | 5534/10250306 | TL072/10250304 | |||
| IC's | TL074/10250305 | TL071/10250303 | |||
| INPUTS | JackSt/10600433 | JackBr/10600432 |
master
| MASTER | FUNCT. | POTS/MISC. | KNOB | CAP | MISC. |
| AUX1 returns | 22KLOGSt/10300109 | Black/10450193 | Gray/10450195 | n.a. | |
| AUX1/2/3/4 mstr | 10KLOG/10300104 | Black/10450193 | Gray/10450195 | n.a. | |
| Monitor select | Switch 2x6positions | Black/10450193 | Gray/10450195 | ||
| MONITOR | 22KLOGSt/10300109 | Black/10450193 | Red/10450152 | n.a. | |
| AUX2/3 returns | 22KLOGSt/10300109 | Black/10450193 | Gray/10450195 | n.a. | |
| IC's | TL072/10250304 | TL074/10250305 | TL071/10250303 | UAA180/10250308 | |
| Transistors | BC337/10250332 | BC546/10250328 | n.a. | ||
| POWERSUPPLY | LM350/10250019 | 7824/10250324 | |||
| Alternative | FADER | 100mm JP/10300089 | Black/10450088 | n.a. | n.a. |
| IN/OUTPUTS | Jack Break Cliff | part nr 10600432 |