Kenwood DP-1100 B Service Manual page 59

• P - 1 1 0 G B II
2. IC OPERATION OF EACH CIRCUIT AND PIN DESCRIPTION
Pin functions
Pin No. Symbol
Pin which outputs the sum signal (A + B) of pin IN A and IN B input signals out of 4-division
photodetector outputs.
1 0UT1
The final stage buffer amp is provided with an external feedback resistance to neutralize the
effect of the irregularity in characteristics between photodiodes.
2 FC1
3 GND2 GND pin
4 IN A
5 IN
B
6 IN C
7 IN D
8 GND1 GND pin
9-10 NC Not connected
11 Positive supply voltage pin
Pin which outputs the sum signal ( B + D) of pin IN B and IN D input signals out of 4-division
12 0 U T 4
photodetector outputs.
Pin which outputs the sum signal (A + C) of pin IN A and IN C input signals out of 4-division!
13 0 U T 3
photodetector outputs.
14 Negative supply voltage pin
Final stage buffer amp negative input pin of OUT2 output signal.
15 FC2
A resistance (for feedback) is connected between this pin and pin OUT2 to control the gain.
62
Final stage buffer amp negative input pin of OUT1 output signal.
A resistance is connected between this pin and pin OUT1 to control the gain.
Input pin of signal A (one of 4-division photodetector outputs)
Input pin of signal B (one of 4-division photodetector outputs)
Input pin of signal C (one of 4-division photodetector outputs)
Input pin of signal D (one of 4-division photodetector outputs)
Description
T a b l e 2 - 1 A
Remarks
i FC. I
-L-r\
IT
R F I
O U T
H / " T '
^ Buffer amp
Note 1
With max. input of 100 kHz
...Transfer impedance
= 27 kfi
= 9 kQ (typical)
R
n
Note 1 Note 1 Note 1 Note 1
Note 1 Note 1
With max. input of 100 kHz With max. input of 100 kHz
...Transfer impedance ...Transfer impedance
= 27 kQ (typical) = 27 kQ (typical)