Panasonic KX-FLB758RU Service Manual page 197

KX-FLB758RU
7.12.2. CHG-BIAS (Charge BIAS)/SUP BIAS (Supply BIAS)/DEV(-) BIAS (Developing(-)
BIAS)/DEV(+) BIAS (Developing(+) BIAS) UNIT
When the CHG REM terminal becomes "L", the transistor Q202 turns ON by MC101, Charge BIAS(-1200V) is output from CHG
OUTPUT, Supply BIAS(-550V) is output from SUP output, and Developing(-) BIAS(-350V) is output from DEV(-) BIAS.By
performing the DEV(-) BIAS output, the condenser C208 is charged with an electric charge. Charging the C208 will be saturated
at 50ms. After that, when DEV CHG terminal becomes "L", Q204 turns ON, and the electric charge charged to the C208 is
released. This electric charge becomes a constant voltage at ZD203, and Developing(+) BIAS(+220V) is output from DEV(+) BIAS.
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