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IC DESCRIPTION
IC, HD3977RC36F
Pin No.
Pin Name
TAKE UP
1
SENSOR
2
VSS (A/D)
END
3
SENSOR
4
TAKE UP REEL
5
SUPPLY REEL
6
SQ PB IN
7
LEVEL METER "L"
8
LEVEL METER "R"
9
AFT
10
PG ADJ
11
A.ENV
12
V.ENV
13
KEY RTN 0
I/O
End sensor to detect the tape's terminal (Lead taps section).
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If "H" is detected signal in the REW, REV modes, the mechanism stops and ejects the
cassette automatically.
–
GND
End sensor to detect tape's terminal (Lead tape section).
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If "H" signal is detected in the FF mode, then REW mode will occur automatically.
1. When the tape is transporting. Reel pulses are input.
2. If the tape is transporting and take-up reel pulses are not input during regular time,
the unit stops at STOP point automatically.
Each operating mode
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PLAY, REC
FF, (REW)
CUE, (REV)
3. Distinguishes the tape type, counts the tape remaining and reduces the tape speed at
the end of FF/REW modes.
1. When the tape is transporting, Reel pulses are input.
2. Distinguishes the tape type, counts the tape remaining and reduces the tape speed at
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the end of FF/REW modes.
3. If supply reel pulses are not detected, FF/REW mode is not operating normally.
And the unit stops at stop point automatically. (Refer to table of pin 17.)
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Input "H" signal from AVCP in super tape PB mode. (option)
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Audio "L" signal input for driving level meter on FDP.
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Audio "R" signal input for driving level meter on FDP.
Port to detect AFT (+)'s state during tuning. When more than 4V, is detected by AFT
(+) detector.
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Detects AFT (–)'s state during tuning. When less than 0.96V, is detected by AFT (–)
detector.
A DC bias level set by VR501 determines the pulse width of PG M.M for H. S/W 30
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switching interval.
Input signal to detect Hi-Fi signal. Main signal to perform auto tracking mode.
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V.ENV signal is the sub signal.
1. Reference input signal to perform auto tracking mode.
Video envelope (F/F) signal is input through LPF.
2. Perform auto tracking mode by sampling video envelope signal which is input
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during a period of head switching and changing servo tracking data to obtain
maximum value.
Note : When the DC level of the envelope is at its maximum, it is considered tracking
properly.
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KEY RTN 0
31
Description
Sec
SP=3 EP/LP=6
2
1
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