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18
CIRCUIT OPERATION
2. AUDIO PART
2-1) EE MODE
External AUDIO signal which is input to pin 16 of IC201 is output from pin 22 of IC201 after being amplified through ALC
and Line Amp.
2-2) REC MODE
It will be the REC mode when REC 5V is input to pin 24 of IC201. Input signal will be replaced on the tape through R/P
HEAD after being amplified and modulated with Bias Frequency. Input signal is amplified and frequency compensated by
REC AMP, ie. it means high band compensation in order to match AUDIO HEAD characteristic. Each mode’s peaking fre-
quency will be determined by BIAS element (R, L, C) of REC AMP. OSC oscillation frequency is 70KHz sinewave, it will
be used for tape’s full erasing and AUDIO TRACK erasing.
2-3) PB MODE
It will be the PB mode when PB 5V is input to pin 11 of IC201. The signal which is picked up from AUDIO HEAD is input
to EQ AMP, then constant Audio Level will be output by PB LEVEL fixed resistor after each mode is amplified and fre-
quency is compensated.18H AUDIO output level will be compensated with receiving Audio 24H(H) control of u-COM.
Finally this output signal is output through 20KHz LPF.