I'm new to StackExchange. I am trying to repair a Yamaha digital radio tuner model TX540 made in early 1990s. I don't have a schematic.
I have been desoldering components and checking them with a DMM or ESR meter (for the capacitors). There are a number of small resistors, all marked the same, that read
OL on the DMM. Initially I thought the first one I checked was open, but another 3 are showing the same.
The resistors are only small and the colour banding is Brown Black Orange Grey Brown. I checked this on a dissecting microscope, although the grey band could be silver. If grey is correct, then that indicates a 10 GΩ resistor. That seems ridiculously large for a small resistor in a domestic radio tuner. I'm assuming the resistors are OK, but outside the range of my DMM which is a Brymen BM257. I have also checked with another DMM, with the same outcome.
I'd appreciate any thoughts anyone might have on this.