Can't change channels using PAL tuner
I just spent the last couple of nights replacing the NTSC tuner with a PAL version. A friend of mine pulled an ALPS TMDG2 tuner out of a VCR and donated it. From memory, my tuner was labelled TMDG2-602 and the howto doc shows a tuner with TMDG2-805A.
The good news is that I can view channel 2 fine (even the sound decoder worked ok), but unfortunately I can't change channels. ie. I pressed the [Channel Up] button and the Tivo displayed the banner for channel 7 but the channel didn't change.
I'm assuming that the I2C bus is working ok in order to be able to view any channel. Of course, I've got no idea what the difference between the -602 and -805A tuners are, but presumably the -602 isn't supported by the Tivo firmware.
Can anyone offer any suggestions as to how to debug what's going on ?
Are there any log files related to communicating with the internal tuner ?