Hi all. I posted this elsewhere, but someone suggested I try this thread.
I just purchased a used Lakland 55-02 Skyline Custom bass. It is awesome, however, I have a very specific issue that I can't find any information about. I have been searching for days, and also sent a message to Lakland, but no response from them yet.
When I have the coil tap toggle switch in the middle (bridge pickup in humbucker mode), then rotate the pickup pan knob all the way towards the bridge, the D and G strings drop out almost completely. This doesn't happen when I set the toggle the switch towards the bridge or neck (single coil), only the middle position and it doesn't affect the B, E, or A strings. I read that it may be gunk in the electronics, so I did a thorough cleaning with electrical contact cleaner, but the issue remains. This also happens in passive mode, so I don't think it's an issue with the preamp. My guesses are that there's a wiring issue, the toggle switch is bad, or the pickup is bad, but can't be certain. I compared to the wiring diagram from Lakland, and it all looks normal. I messaged the guy I bought it from and he claims he bought it new from
Sweetwater in 2020 and made no modifications.
Interestingly enough, when it's in humbucker mode, I was tapping the pickup under the string on both coils with an Allen wrench and there is output. It seems to be as loud as the other 3 strings. On that same note, when I tap the string with the wrench, I get a loud percussive sound, but seems to be missing high end. This makes me think maybe there's cancellation happening since it won't pick up the string vibration. I think the Lakland MM pickup has 4 coils, 2 under the D and G, so this makes the most sense to me.
Thanks for your help!