Onkyo TXSR 304 Service Manual

Page 1

TX-SR304(HT-S4100)

Ref. No. 4059

ONKYO SERVICE MANUAL 2"

AV RECEIVER
MODEL TX-S R304

For HT-S4100

RC-64SS

Black and Silver models

B MDC 120V AC, 60Hz
S MDC 120V AC, 60Hz

SAFETY-RELATED COMPONENT
WA R N I N G ! !

COMPONENTS IDENTIFIED BY MARK A ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.

MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.

ONKYO®

IMAGINATIVE SIGHT & SOUND

Page 40

TX-SR304/304E

IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-10
05001 : R2315211FP (8 ch Electronic Volume and 11 Input Selector and Tone Control)-1/3

SYSTEM BLOCK DIAGRAM
Multi Multi

REC SUB Rin Lin Rch Tone Lch Tone CLOCK DATA
0-0-0 0-0-0 T T
MCU I/F
Tone
% Volume Volume
1-- Bass & Lout
i g- . ' Treble '
Lab (2 #3 Volume _ B,15$ & _ Volume

; E? . Treble -)Rout
9 E
10
11

mono SBLout
1
2 SBRout
3
4
5

Rch 9 Cout
8
1(9) 0 SWout
11 o
O SLoul
. SRout

REC SUB

AGND AVEE AVCC

Page 42

TX-SFI304/304E

IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-12

05001 : R2515211FP (8 ch Electronic Volume and 11 Input Selector and Tone Control)-3/3

TERMINAL DESCRIPTION

PIN No. Name Function
19,17. FROUT,FLOUT,
14,12, 6-OUT,5-OUT, .
9,7, 4-OUT, 3-OUT, Output pm of FL/FR/C/SW/SL/SR/SBL/SBR channel
42 2-OUT,1-OUT
20,16, FRC,FLC,
15,1 1. 6.C,5.C, Connects capacitor for reducing click noise of
10,6, 4-C,3-C, L/R/C/SW/SL/SR/SBL/SBR channel volume
5,1 2-C,l-C
3,8, . . .
13 18 AGND Analog ground of internal circuit
23,27 TREL. TREK Frequency characteristic setting pin of L/R channel tone control(Treble)
21,22, BASSL1,BASSL2 \ . . . . . . .
25,26 BASSRI, BASSRZ Frequency characteristic setting pm of L/R channel tone control(Bass)
24 AVCC Positive power supply to internal circuit
35,34, FRINZ, FLINZ,
33 32 SRN2,SLIN2,
31,30, SWIN2,CIN2,

SBRIN2,SBLIN2
29:28 Input pin of L/R/C/SW/SL/SR/SBL/SBR channel (Multi IN 1/2)
73,74, FLIN1,FRIN1,
75,76, CIN1,SWIN1,
77,78, SLIN1,SRIN1,
79,30 SBLIN1,SBRIN1
41 DGND Digital ground of internal circuit
42 DATA Input pin of control data
43 CLOCK Input pin of control clock
44 AVEE Negative power supply to internal circuit
46,48,50, INL1, INL2, INL3,
52,54,56, INL4, INLS, INL6,
58 60 64 INL7, INL8, INL9

In ut 'n of UK channel In tSeIe tor
45,47,49, INR1,INR2,INR3, p P' ( P" L )
51,53,55, INR4, INRS, INR6,
57,59,63 INR7, INRS, INR9
40 MONO Input pin of monaural (Input Selector)
38,39 SUBL,SUBR Output pin for L/R channel SUB Output
36,37 ADCL, ADCR Output pin for L/R channel ADC
72 RECL3 .
Output pin for L/R channel REC Output

71 RECR3
61,62. INRA/RECR1,INLAIRECL1,
65 66 INRB/RECR2,INLB/RECL2, Input pin of L/R channel (Input Selector)/
67,68, INRlO/RECR4,INL10/RECL4, Output pin for L/R channel REC Output
69,70! INRl 1/RECR5,INL1 1/RECL5