Sharp 902SH Service Manual page 99

902SH
IC1603 (AN12974A): AGC STEREO AMP.
Pin No. Terminal name
1 C3
2 R3
3 – (Analogue signal)
4 – (Analogue signal)
5 – (Analogue signal)
6 AGC ON/OFF
7 VREFSP
8 VCC
9 SP-SAVE
10 SPOUTR–
11 GNDSPR
12 SPOUTR+
13 SPOUTL–
14 GNDSPL
15 SPOUTL+
16 STB ON/OFF
17 VCC
18 VREFSP
19 AGCDET
20 – (Analogue signal)
21 – (Analogue signal)
22 – (Analogue signal)
23 R1
24 C1
25 C2
26 R2
27 VREF
28 IN-L
29 VCC
30 IN-R
31 GND
32 SURROUND ON/
OFF
CONFIDENTIAL
Input/Output
– Surround filter terminal R-ch 1
– Surround filter terminal R-ch 2
Output Surround output R-ch
Output Inverting amplifier output R-ch for gain adjustment
Output Inverting amplifier output R-ch for gain adjustment
Input AGC ON/OFF switching
– Precharge timing pin
– VCC-SP (R-ch)
Input Speaker power save ON/OFF switching
Output Speaker output R-ch (–)
– Earth (SP R-ch)
Output Speaker output R-ch (+)
Output Speaker output L-ch (–)
– Earth (SP L-ch)
Output Speaker output L-ch (+)
Input All standby ON/OFF switching
– VCC-SP (L-ch)
– 1/2 VCC-SP (VREF-SP)
– AGC signal detector
Output Inverting amplifier output L-ch for gain adjustment
Output Inverting amplifier output L-ch for gain adjustment
Output Surround output L-ch
– Surround filter terminal L-ch 2
– Surround filter terminal L-ch 1
– Surround effect adjustment 1
– Surround effect adjustment 2
– 1/2 VCC (VREF)
Input Sound input terminal L-ch
– VCC
Input Sound input terminal R-ch
– Earth
Input Surround ON/OFF switching
24 23 22
25
26
+6 dB
-6 dB
-40 dBV
27
28
29
30
-40 dBV
-6 dB
+6 dB
31
32
1 2 3
Description of terminal
21 20 19 18 17
0 dB
-
+
+13 dB
-27 dBV
AGC
AGC
+13 dB
Det.
+13 dB
AGC
-27 dBV
+13 dB
-
+
Timing
0 dB Cont.
4 5 6 7 8
6 – 22
16
15
14
13
12
11
10
9