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Panasonic SD 251 bread-maker

Not my usual area of repair but change as good as a rest ,they say Schematic not in the service manual , well not the one on

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105444c3.zip

I've never used one so am unfamiliar. Is the motor function separate from the heater function - I assume so, both are failing to operate it would seem. Unit was working fine and then failed to start one time. LCD and option selections work fine, press Start , the red LED goes on but then no motor or heater and no Err in the LCD display. Fuses and wiring ok, seems to have 2 control lines through the interboard ribbon , one to a relay for the heater and one variable one to a triac for the motor. All associated minor components seem fine testing cold (no isolation Tx here , everything hanging off the mains), no hot spots. Solder to main 64p SMD seems ok. Not full of cooking grime What is a supercap doing on the power board , not connected through the ribbon to the control board, some relay hold-off or hold-on funtion at switch off for some safety reason , rather than memory retention ?

Reply to
N_Cook
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You can program these to start at a specific time many hours into the future.

Perhaps the Supercap is there to keep the timer running in the case of a temporary Power Outage, so you might still be able to have your piping hot bread in the morning.

Gareth.

Reply to
Gareth Magennis

Oh, and when they start, there will not be any heater. The motor will mix and knead the dough and rest, through several cycles over perhaps an hour or so, before any heating ever takes place.

Gareth.

Reply to
Gareth Magennis

Looks like it was corrossion on the ribbon connector or another connector, the rest is probably RTFM.

Supercap is connected to p51 and p54 of the 64 pinner so probably retains memory for a maximum of 10 minutes of power outage. Then from the manual there is a "Resting" stage where the heater comes on for a second twice a minute unless you warm the bucket temp sensor with hot air. Similarly selecting "Dough" the oven has to be up to some temperature something like 25 deg C before the motor/kneding action starts.

Reply to
N_Cook

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