Sharp 902SH, Service Manual

Page: 99 / 121

902SH
6 – 22
CONFIDENTIAL
IC1603 (AN12974A): AGC STEREO AMP.
Pin No. Terminal name Input/Output Description of terminal
1 C3 – Surround filter terminal R-ch 1
2 R3 – Surround filter terminal R-ch 2
3 – (Analogue signal) Output Surround output R-ch
4– (Analogue signal) Output Inverting amplifier output R-ch for gain adjustment
5 – (Analogue signal) Output Inverting amplifier output R-ch for gain adjustment
6 AGC ON/OFF Input AGC ON/OFF switching
7 VREFSP – Precharge timing pin
8 VCC – VCC-SP (R-ch)
9 SP-SAVE Input Speaker power save ON/OFF switching
10 SPOUTR– Output Speaker output R-ch (–)
11 GNDSPR – Earth (SP R-ch)
12 Output Speaker output R-ch (+)
13 SPOUTL– Output Speaker output L-ch (–)
14GNDSPL – Earth (SP L-ch)
15 Output Speaker output L-ch (+)
16 STB ON/OFF Input All standby ON/OFF switching
17 VCC – VCC-SP (L-ch)
18 VREFSP – 1/2 VCC-SP (VREF-SP)
19 AGCDET – AGC signal detector
20 – (Analogue signal) Output Inverting amplifier output L-ch for gain adjustment
21 – (Analogue signal) Output Inverting amplifier output L-ch for gain adjustment
22 – (Analogue signal) Output Surround output L-ch
23 R1 – Surround filter terminal L-ch 2
24C1 – Surround filter terminal L-ch 1
25 C2 – Surround effect adjustment 1
26 R2 – Surround effect adjustment 2
27 VREF – 1/2 VCC (VREF)
28 IN-L Input Sound input terminal L-ch
29 VCC – VCC
30 IN-R Input Sound input terminal R-ch
31 GND – Earth
32 SURROUND ON/
OFF Input Surround ON/OFF switching
25
26
27
28
29
30
31
32
16
15
14
13
12
11
10
1 2 3 4 5 6 7 8
24
-6 dB
+6 dB
AGC
AGC
+6 dB
+13 dB
+13 dB
+13 dB
+13 dB
0 dB
0 dB
-40 dBV
-27 dBV
-27 dBV
-40 dBV
SP
A
TIALIZER®
-34
dBV
-34
dBV
-34
dBV
+7
dB
+7
dB
-34
dBV
-6 dB
23 22 21 20 19 18 17
9
-
+
-
+
AGC
Det.
Timing
Cont.