I managed to overfill the bag 5 times today as the buzzer for bag full had broken. Really annoying as the deck starts shaking and dumping grass. Then even when the bag is emptied, the chute is rammed full and isn't that easy to clear.
The bag full assembly 629-1089a is 1 item consisting of a switch and very loud buzzer. A snip at €100. My junk box didnt have anything close to replace the buzzer. The buzzer is a mallory ps-551q, 105dB, available at mouser for €10.
It turns out the buzzer was taking 1A, the spec is 0.2A. It comes apart easily to reveal a large piezo and a THP pcb. A 4011 drives a few transistors, a small transformer and the piezo. Having tested the actives, I put a probe on the 4011. Dead. A 20p item in the '80s when I used them for various projects and still a few in stock. Probably £1 for 10 now. A quick swap and all was back to its deafening old self. Consumption was around 0.15A
Not a bad saving for an hours work !
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