Pioneer CT-1060W Service Manual page 45

The CT-1060W (CT-S77W) Stereo Dual
Cassette Tape Deck features two separate cassette
deck sections — one for recording and playback,
and the other for playback only. g
12.1 OUTLINE OF MAIN SECTIONS
Playback Equalizer
A low-noise operational amplifier IC (M5220L)
is used for both deck I and II. Playback equaliza-
tion is switched to match the type of tape by
transistor switching of the equalizer element in the
equalizer amplifier output circuit. This switching is
automatic when the chrome tape detector hole is
detected in deck I, but requires manual switching
of the TAPE SELECTOR switch in deck II.
@ CUE and REVIEW signal attenuator
When deck I is switched to cue or review mode,
the transistor switch in the output stage of the
playback equalizer circuit is turned on, resulting
in the high end frequency response being lowered
in addition to the overall level being reduced.
(Deck I is switched to cue or review mode by
pressing the FF or REW button together with the
PLAY button. The RELEASE button is pressed
to release the FF or REW key and return to normal
playback mode.)
mS 6 46 6 .
Fig. 12-1
Block diagram of AN6886
CT-1IO60W, CT-S77W
Dolby NR Section
An IC (HA12058NT) is used to switch to type B
or type C Dolby NR. When in copy mode, the
Dolby NR section is bypassed, the deck I playback
signal being recorded directly in deck II.
Recoding Amplifier
Employing an operational amplifier IC
(M5218L), the required recording characteristics
are obtained by switching peaking elements in the
feedback circuit.
Level Meter
A 5-point LED drive IC (AN6886) equipped
with two input circuits is used to connect and
combine left and right channels and drive the
logarithmic (dB) bar type meter.
Control Section
Signal and indicator circuits are controlled by a
microcomputer (PD4061). (See 12.3 "Signal and
Indicator Circuit Control"'.)
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