(3) Pin Port Description (IC301 ; LA71207M)
PIN NO.
PIN NAME
9
REC OUT
75
GND
6
BIAS
11
BIAS CTL
6
PB EQ (+)
5
PB EQ (-)
7
PB EQ SW
3
PB EQ OUT
2
LINE PB IN
58
A.MUTE
76
INPUT 1
78
INPUT 2
1
Vref Filter
80
Input 3
77
Vcc
10
Line Out
79
ALC IN
DC VOLT.
SIGNAL
2.3
-2dBm
0
-
REC:2.3
70KHz+1KHz MIX
PB:0
3Vp-p
REC:4.3V
-
PB:5V
2.3
-
2.3
-
2.3
-
2.3
-32dBm
2.3
-32dBm
0
-
2.3
-27dBm
2.3
-27dBm
2.3
-
2.3
-27dBm
5.0
-
2.3
-4dBm
2.3
-13dBm
REMARK
REC AMP OUTPUT (GAIN ; 14dB)
It is grounded due to the switch inside of IC
during playback. During recording, it operates on
60KHz input HPF
The BIAS CTL voltage change depends on the
external TR.
PB EQ AMP INPUT (+)
PB EQ AMP INPUT (-)
PB EQ AMP SLP SW
PB EQ AMP OUTPUT
LINE AMP
INPUT (PB)
Operates at HIGH (5V)
AUDIO INPUT : -27dBm
AUDIO INPUT : -27dBm
AUDIO INPUT : -27dBm
AUDIO OUTPUT : -4dBm
ALC level selector
Circuit Operating Descriptions
7-43