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SERVICE MANUAL
MODEL AVR-1604/684
AVC-1580
AV SURROUND RECEIVER / AMPLIFIER
For purposes of improvement, specifications and
design are subject to change without notice.
Please use this service manual with referring to the
operating instructions without fail.
Some illustrations using in this service manual are
slightly different from the actual set.
16-11, YUSHIMA 3-CHOME, BUNKYO-KU, TOKYO 113-0034 JAPAN
X0174V.02 DE/CDM 0311
AVR1604/684 / AVC-1580 2
SAFETY PRECAUTIONS
The following check should be performed for the continued protection of the customer and service technician.
LEAKAGE CURRENT CHECK
Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis
resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the
power cord is less than 460 kohms, the unit is defective.
500V
1M
(1)
(2)
(1)
(2)
2
AVR-1604/684 / AVC-1580 3
-
3
AVR-1604/684 / AVC-1580 4
LEVEL DIAGRAMS
FRONT/CENTR/SURROUND/SURROUND BACK
INPUT
A/D IN A/D IN D/A OUT SW SUM ELECTRIC
BUFFER REV AMP TONE PRE AMP POWER AMP
REV AMP REV AMP LPF REV AMP VOLUME
AMP
HPF
+
DIGITAL
DIR
SPK OUT
CD IN + - - A/D DSP D/A + - - +
FRONT
BD3811K1 ATT H/P OUT
MUTE SUM S/W MUTE
6CH IN
40dB
FRONT
30dB
SPK OUT
20dB A/D D/A FRONT
2.83V
0dBFS 0dBFS (1W/8ohm)
10dB
25.5dB
-10dBFS -10dBFS
6CH IN
0dB -35.5dB
6CH IN (200mV) CD IN -12dB
-20dBFS 6dB
-20dBFS D/A OUT
-18dB 15.5dB
-10dB 100mV REF H/P OUT
47mV
(0.27W 8ohm)
-30dBFS -30dBFS
VOL 00
-20dB
BD3811K1
6CH IN
SPK OUT
DSP OUT D/A + + CENTER
SURROUND
MUTE MUTE
40dB
CENTER BD3812F
SPK OUT
SURROUND DSP OUT D/A + + SURROUND
BACK
30dB
SURROUND-BACK
MUTE MUTE
20dB D/A SPK OUT
2.83V
(1W/8ohm)
0dBFS
10dB
-10dBFS 25.5dB
CENTER
6CH IN 0dB
(200mV)
-20dBFS 6dB SL/SR/SB
D/A OUT -18dB 15.5dB
-10dB
100mV REF
-30dBFS
VOL 00
-20dB
4
AVR-1604/684 / AVC-1580 5
SUB WOORER
D/A OUT SW SUM ELECTRIC
REV AMP PRE AMP
LPF REV AMP VOLUME
SUB_WOOFER
BD3811K1
6CH INPUT
SUB WOOFER
DSP OUT D/A + - - +
PRE OUT
MUTE MUTE
30dB
D/A
20dB
0dBFS
10dB Front D/A Out TO FRONT CH
200mV ref
-10dBFS
SUB WOOFER
(200mV) OdB 10.5dB PRE OUT
150mV
6CH IN (112mV) -5dB -20dBFS
-10dB Config2 -25dBFS 6dB
LFE 27.5(15.5+6+6)dB
6dB -18dB
-30dBFS
-20dB Config1 -38dBFS 6dB
LFE
VOL 00
-30dB
5
AVR-1604/684 / AVC-1580 6
BLOCK DIAGRAM
AVC1570X / AVR1604 BLOCK DIAGRAM
DSP
ROM
INTREQ RESONATOR KEY_MATRIX
512k X 8
DIGITAL OUT DIGITAL AUDIO DECODER CS 12MHz
MELODY 32 SCDIN FROM
RAM
SCDIO MICOM
OPTICAL 64k X 16
RDATA(21) SCCLK
DR1 RESET
RCLK0(61)
RCLK1(68)
TCLK0(57)
TCLK1(65)
TCLK2(47)
DIR 16-ST-42GNK
RFS3(41)
RFS1(69)
CLKIN
DT0(56)
DATA TUNER PLL MICOM FLT DRIVER FL DRIVER
(32)
DIGITAL IN LC89057W-VF4
BUFFER
DR0
DATA CXP740096 DATA LC75721NE
FL DISPLAY
74LV244
COAXIAL +
DeModulate
256fs 256fs H/P OUT
OPTICAL 1 INPUT DATA -
& 64fs 64fs
DTS/DD/PL II
OPTICAL 2 Selector Selector + + +
Lock Detect fs 64fs FL
PART DATA
-
fs SPK A
+
fs FR
XMCK
-
FL/FR/C
SW/SB
SL/SR
X-TAL
+ + +
DIGITAL FL
FILTER DAC -
BD3811K1 SPK B
+
DSDATA1
ASDATA
FROM CCLK SW F FR
ALRCK
ABCLK
CONTROL PORT CLOCK MUTE -
MCLK
MICOM CLATCH MIXING
CIN ANA_IN
+ + +
COUT DIGITAL DSP_FL CENTER
VOLUME
FILTER DAC + - -
EX_FL -
ANALOG IN ANA_IN SPEAKER OUT
BD3811K1
DIGITAL DSP_FR
VOLUME
FILTER DAC + - -
EX_FR
CD + + +
SERIAL DATA SURR L
AUX I/O PORT -
DIGITAL SL
DVD/VDP VOLUME
FILTER DAC +
EX_SL
TV/DBS
HPF
VCR SDOUT + + +
DIGITAL SR SURR R
VOLUME
FILTER DAC +
CDR/TAPE EX_SR -
DIGITAL
ADC FILTER
DIGITAL CENTER
VOLUME
FILTER DAC +
ANALOG OUT EX_C
+ + +
SURR BACK
DIGITAL -
VCR ADC FILTER DIGITAL SW
VOLUME
FILTER DAC + - -
AUDIO CODEC EX_SW
AD1837
+ SUB WOOFER
CDR/TAPE
DIGITAL
VOLUME
FILTER DAC +
PRE OUT
DIGITAL
VOLUME
FILTER DAC 2CH-VOLUME IC MUTE
FRONT IN BD3812F
MICOM, FLT DRV
7805
OPTICAL 3
INPUT SELECTOR & VOLUME AC CORD
RMC_IN/OUT
V.AUX L/R
V.AUX VIDEO
VIDEO INPUT MUTE +12V DSP
+2.5V
DIR
+3.3V
DVD/VDP ENCODER
FILAMENT AC
TV/DBS
CODEC
ANALOG IN VCR
7805
AC OUTLET
TUNER RELAY
VIDEO SWITCH
LA7952*1
VCR OUT VIDEO
7812
FL
MONITOR OUT
FR
+12V
C +5V
6CH_EX_INPUT S-VIDEO INPUT 7805
SW A/D POWER
SL OP AMP
7815
SR
INPUT/VOL
DVD/VDP
TUNER
TV/DBS
TUNER PART IF FILTER IF FILTER INPUT/VOL
VCR
FM OP AMP
FM ANT 7915
FRONTEND FM & AM
VIDEO SWITCH
IF AMP IF IC LA7952*2 ( C, Y )
VCR OUT MAIN +B
AM ANT MONITOR OUT
AM TUNING
MPX IC RMC IN/OUT DATA IN (REMOCON)
MAIN -B
CXA1511M
+5.6V(CPU)
LOOP FILTER PLL CIRCUIT L.P.F COMPONENT VIDEO INPUT
-VKK
-36V
DVD/VDP SEL1/2
MUTING
TV/DBS
COMPONENT
FROM u-COM
MONITOR OUT 7805
VIDEO SWITCH
BA7625*1,BA7626*2 ( Y, B-Y, R-Y )
6
AVR-1604/684 / AVC-1580 7
ADJUSTMENT
Tuner Section (AVR-1804/884 only)
CONNECTION DIAGRAM OF MEASURING INSTRUMENTS
FM
T402 T403
R471 STEREO
MODULATOR
IC402
75ohm FM SSG
VR402
Digital
Voltmeter
TUNER B'D
FM ALIGNMENT
Tuning Input Output Adjustment
Alignment
Step Frequency Input
Item Type Frequency Modulation Coupling Type Connect to Points Adjust to
Setting Level
Center 98.1MHz Mono Antenna Digital
1 FM SSG 98.1MHz 60dB