The manual was very accurate for the part that I was changing, I was able to order the correct part and had no issues with the replacement procedure. However, I was expecting to have more detailed repairs for the lower drive unit.
Text excerpt from page 18 (click to view)
5 Troubleshooting
5-3 No OSD
WAVEFORMS
There is video but no OSD.
11
11 12
Does input signal appear 13 at the Pins 2, 5 and 10 of IC404? Yes
No Check IC405 and related circuit.
CH1 RMS = 4.18V
12
While pushing a front control button does any pulse appear at Pin 12 of IC404? Yes