My Pioneer CT-F950 has developed a problem when recording onto chrome (CrO2) tapes and with the tape selection switch set to chrome. The recorded level on the left channel is significantly less (about half) than the recorded level on the right channel. The problem does not occur with metal tapes and the tape selection switch set to metal. I have confirmed all this with test tones. Playing laboratory test tapes shows there is no problem with playback. Output level on both channels is the same. However, when I record test tones onto chrome tapes, the playback level on the left channel is incorrect. Has anyone encountered this before?