JVC PC-XC350 Service Manual - Page 10

PC-XC350 Electrical Performance Items Measurement conditions Adjustment of recording blas current (Reference Value) Mode: Playback mode Recording mode Test tape TDK-D60 Measurement output terminal : Both recording and headphone terminals Adjustment of recording and palyback frequency characteristics Reference frequency :1KHz and 8KHz (REF.:-10dB) Test tape TDK-D60 Measurement input terminal : OSC IN Measurement method 1 With the recording and playback mechanism, load the test tapes TDK-D60, and set the mechanism to the recording and pausing condition in advance. 2 After connecting 100 in series to the recorder head, measure the blas current with a valve voltmeter at both of the terminals 1 with the recording and playback mechanism, load the test tapes (TDK-D60) and set the mechanism to the recording and pausing condition in advance 2 While repetitively inputting the reference frequency signal of 1KHz and 8KHz from OSC IN, record andplayback the tape. 3 While recording and playback the test tape Lch and Rch so that the output deviation between 1KHz and 8KHz from -1dB +/-2dB Standard Values TDK-D60 4.5 u A +/-0.5u A Output deviation between 1KHz and 8KHz :-1dB +/-2dB Adjusting position Reference Values for Electrical Function Confirmation Items Items Recording blas frequency Measurement conditions Measurement method Playback Test tape TDK-D60 Measurement terminal : BIAS TP on P.C. board 1 While changing over t and form BIAS 1 and 2, confirm that the frequency is changed. 2 With the recording and playback mechanism, load the test tape. (TDK-D60), and set the mechanism to the recording and pausing condition in advance. 3 Confirm that the BIAS TP frequency on the P.C. board is 64KHz +/-6KHz Standard Values Adjusting position 64KHz +/-6KHz T201 1-10