Cassettes played back OK without Dolby but when the NR system was engaged the right channel sound became muffled and distorted. Initially the Dolby relay 2RL1 was suspected but cleaning its contacts made no difference. As the DC voltage at pin 15 of 2IC201 (LM1011AN) was only around 0.7V when the same measurement at pin 15 of 2IC101 showed 1.4V 2IC201 was replaced, clearing the fault.

Another machine showed full output on the right channel PPM display all the time, even when playing a blank cassette. As the sound was unaffected 2IC2 (LF347N) was replaced and the PPM readings returned to normal.

If, when adjusting the record current, it proves impossible to reduce the level sufficiently to accomodate modern high sensitivity IEC II tapes (such as TDK SA) change the miniature presets R121 and R221 from 22k to 47k. This gives a suitably greater range of adjustment. [Beocord 8000]