(4) Bias board
The bias board contains the developing bias output circuit, registration sensor, paper empty sensor, and the cassette switch. It also provides a liaison connection to the high voltage board, power supply, and the toner sensor.
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| Bias board |
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| +5 V |
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| Engine board |
Toner | TONER |
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| TONER |
sensor |
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| +5 V |
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| +24 V | 5 V DC |
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| 24 V DC |
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| SENPOW |
Power supply |
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board |
| Regist- |
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High voltage |
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| RESIT | |
board |
| ration |
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| sensor |
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+5 V | +5 V |
| Casette |
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+24 V | 5 V DC | +24 V |
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| 24 V DC |
| switch |
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| SWIN | |
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| Paper |
| PAPERN |
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| sensor |
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| RTHVDR, HVISEL |
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| PSEL1, PSEL2 |
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| FANL |
| FAN |
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| FANH |
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| HEATN, ZCROSS |
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| EXTIN, THERM |
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| +24 V |
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275 V DC + AC |
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| HVCLK | |
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| Developing bias |
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Developing |
| output circuit |
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roller |
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