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SERVICE MANUAL
MODEL AVR-1804/884
AVC-1880
AV SURROUND RECEIVER / AMPLIFIER
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, BUNKYOU-KU, TOKYO 113-0034 JAPAN
X0173V.01 DE/CDM 0307
AVR1804/884 / AVC-1880 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-1804/884 / AVC-1880 3
LEVEL DIAGRAMS
FRONT/CENTR/SURROUND/SURROUND BACK
INPUT D/A OUT
A/D IN A/D IN SW SUM ELECTRIC
BUFFER LPF REV AMP PRE AMP TONE POWER AMP
REV AMP REV AMP REV AMP VOLUME
AMP
HPF
+
DIGITAL
DIR
SPK OUT
CD IN + - - A/D DSP D/A + - - +
FRONT
ATT H/P OUT
MUTE SUM S/W MUTE
6CH IN
40dB
FRONT
30dB
SPK OUT
20dB A/D D/A FRONT
2.83V
(1W/8ohm)
0dBFS 0dBFS
10dB
25.5dB
-10dBFS -10dBFS
6CH IN
0dB
-35.5dB
6CH IN (200mV) CD IN
-12dB
6dB
-20dBFS
-20dBFS
D/A OUT
-18dB
100mV REF 15.5dB
-10dB H/P OUT
47mV
(1W 8ohm)
-30dBFS -30dBFS
VOL 00
-20dB
6CH IN
SPK OUT
DSP OUT D/A + + CENTER
SURROUND
40dB
CENTER
SURROUND
30dB SURROUND BACK MUTE MUTE
20dB D/A SPK OUT
2.83V
(1W/8ohm)
0dBFS
10dB
-10dBFS 25.5dB
CENTER
6CH IN 0dB
6dB
(200mV) SURR/SB
-18dB
-20dBFS
D/A OUT
100mV REF 6dB
-23dBFS -15dB
-10dB 15.5dB
D/A OUT
70.8mV REF
-30dBFS
VOL 00
-20dB
3
AVR-1804/884 / AVC-1880 4
SUB WOORER
D/A OUT
SW SUM ELECTRIC
LPF REV AMP PRE AMP
REV AMP VOLUME
SUB_WOOFER
6CH INPUT
SUB WOOFER
DSP OUT D/A + - - +
PRE OUT
MUTE MUTE
30dB
D/A
20dB
0dBFS
10dB
Front D/A Out
200mV ref
TO FRONT CH
-10dBFS
10.5dB SUB WOOFER
(200mV) OdB PRE OUT
150mV
6CH IN (112mV) -5dB
-20dBFS
6dB
-10dB
21.5dB
Config2 -28dBFS
LFE -15dB
-30dBFS 10dB
6dB
-20dB
Config1 -38dBFS 6dB
LFE VOL 00
-30dB
4
AVR-1804/884 / AVC-1880 5
BLOCK DIAGRAM
ROM RAM
512K X 8 64K X 16
BUFFER
REMOTE CONT
74LV244
IN/OUT
DIR 64fs RESONATOR KEY_MATRIX
DIGITAL OUT
TCLK2(47) 12MHz
LC89057W-VF4 64fs TCLK1(65)
RCLK1(68)
64fs RBCK(17) DIGITAL AUDIO DECODER
OPTICAL_1 fs
RFS1(69) MELODY 32 SPEAKER OUT
OPTICAL_2 fs RLRCK(20) fs
OPTICAL_3
DEMODULATION
DATA
256fs RMCK(16) 256fs
PF6(41)
RCLK0(61)
TUNER PLL u-COM FLT DRIVER FL DRIVER FL DISPLAY +
CLK_IN(132)
INPUT & FRONT A L
TCLK0(57) DATA CXP740096 DATA LC75721NE -
OPTICAL_4 Selector Lock Detect Selector 16-ST-42GNK
DT0(56)
RDATA(21)
COAXIAL DR1(67)
XMCK DR0(60)
DIGITAL AUDIO
CONTROL DATA
+
FL/FR/C/SL/SR/SW/SB FRONT A R
-
TONE SPK A
POWER AMP
TC9184
AUDIO SWITCHING
+ +
TC9164
VOLUME FRONT B L
CONTROL PORT CLOCK
DSDATA1
TC9482 -
ALRCK
MCLK
ASDATA
ABCLK
ANA_IN
DIGITAL IN TC9274-011 TC9273-004 CCLK
ANA_HFP TONE DFT CON.
REC_SWITCHIG INPUT_SWITCHIG CLATCH
DSP_FL
ANALOG IN FROM MICOM CIN + - -
VOLUME EX_FL
COUT SERIAL DATA + +
PHONO DIGITAL
+
I/O PORT DAC FRONT B R
FILTER ANA_IN
-
CD ANA_HFP
VOLUME + - SPK B
DSP_FR
CDR/TAPE -
EX_FR
DVD/VDP
TV/DBS SL
+ + +
VOLUME EX_SL SURR L
VCR1
-
DIGITAL
DAC
VCR2 FILTER
SR
V.AUX VOLUME +
EX_SR
TUNER
(JAPAN ONLY) + +
DIGITAL SURR R
ADC FILTER SW F SUM CENTER
+ -
VOLUME EX_C
ANALOG OUT
DIGITAL
DAC
FILTER
CDR/TAPE OUT
SW
-
VOLUME + - -
VCR1 OUT EX_SW + +
CENTER
-
DIGITAL
VCR2 OUT ADC
FILTER
+ VOLUME +
DIGITAL
-
DAC
FILTER
+
MULTI OUT VOLUME MUTE
CODEC
AD1837
+
KIC9459 H/P OUT
HPF
+
L/R SUM BUFF
L
- - SW
E3 ONLY R
CXA1511M