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SERVICE MANUAL
MODEL AVR-2105/885
AVC-1890
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.
Tokyo, Japan
X0206V.01 DE/CDM 0407
AVR2105/885 / AVC-1890
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-2105/885 / AVC-1890
LEVEL DIAGRAMS
FRONT/CENTR/SURROUND/SURROUND BACK
INPUT D/A OUT
A/D IN A/D IN SW SUM
BUFFER LPF REV AMP PRE AMP POWER AMP
REV AMP REV AMP REV AMP
AMP
HPF
+
DIGITAL
DIR
SPK OUT
CD IN + - - A/D DSP D/A + - - +
FRONT
TONE CONTROL
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
(0.27mW/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-2105/885 / AVC-1890
SUB WOORER
D/A OUT
SW SUM
LPF REV AMP PRE AMP
REV AMP
SUB_WOOFER
6CH INPUT
SUB WOOFER
DSP OUT D/A + - - +
PRE OUT
MUTE MUTE
30dB
D/A
20dB
0dBFS
10dB
Front D/A Out
100mV ref
TO FRONT CH
-10dBFS
10.5dB SUB WOOFER
(200mV) OdB PRE OUT
373mV
6CH IN (112mV) -5dB
-20dBFS
6dB
-10dB
21.5dB
Config2 -28dBFS
LFE
-30dBFS 10dB -18dB
-20dB
6dB
Config1 -38dBFS
LFE VOL 00
-30dB
4
AVR-2105/885 / AVC-1890
FRONT VS SW
FRONT VS SW
INPUT D/A OUT
A/D IN A/D IN SW SUM ELECTRIC
BUFFER LPF REV AMP PRE AMP POWER AMP
REV AMP REV AMP REV AMP VOLUME
AMP
HPF
+
DIGITAL
DIR
DSP with SPK OUT
CD IN + - - A/D D/A + - - +
Tone control FRONT
ATT H/P OUT
MUTE SUM S/W MUTE
6CH IN
40dB
FRONT
30dB
20dB A/D D/A SPK OUT
FRONT
4.35V
0dBFS 0dBFS
10dB
26.02 dB up
-10dBFS -10dBFS
6CH IN
-13.2dB -11.66dB -35.5dB down
0dB
1.54dB up -13.06dB
6CH IN (200mV) CD IN
-12dB
6.8dB up -16.7dB 18dB down
Front -20dBFS
-20dBFS D/A OUT
16.6dB up -13.14dB
100mV REF
-10dB
14.5dB up H/P OUT
18dB down 21.56dB up 73mV
-31.2dB -29.66dB
-30dBFS -30dBFS
6.8dB up -34.7dB
-20dB Config1 SW -38dBFS
5
AVR-2105/885 / AVC-1890
BLOCK DIAGRAM
PRE OUT
REMOTE CONT
FL
IN/OUT
FR
ROM RAM RESONATOR KEY_MATRIX C
128K X 8 128K X 8 12MHz
SL
SR
SBL
DIGITAL OUT DIR BUFFER
DIGITAL AUDIO DECODER SBR
74LCX244
LC89057W-VF4 ADSP-21266 TUNER PLL u-COM FLT DRIVER FL DRIVER FL DISPLAY SW
DATA CXP 740010 DATA LC75721NE
OPTICAL_1 fs RLRCK(20) fs
DAI_P10(77) 16-ST-66GNK SPEAKER OUT
OPTICAL_2 64fs RBCK(17) 64fs
DEMODULATION DAI_P9(71)
DATA
DAI_P16(86)
DAI_P15(82)
DAI_P14(81)
DAI_P13(80)
OPTICAL_3 256fs RMCK(16) 64fs
CLK_IN(142)
INPUT & DAI_P12(79) DIGITAL AUDIO
OPTICAL_4 RDATA(21) H/P OUT
Selector Lock Detect Selector CONTROL DATA
DAI_P20(94)
COAXIAL SBCK(22)
DAI_P11(78)
XIN
FCX10-03 SELECTOR
+
SLRCK(23)
ADIN(24)
25MHz 74LVX157 FRONT A L
-
12.288MHz
AUDIO SWITCHING POWER AMP
TC9164 VOLUME
TC94A27UG
ANA_IN +
ANA_HFP FRONT A R
-
DSDATA1
CONTROL PORT CLOCK
DSDATA4
DSDATA3
DSDATA2
DSP_FL
ABCLK
SPK A
ALRCLK/FSTDM
EX_FL
DIGITAL IN TC9274-011 TC9273-004
REC_SWITCHIG INPUT_SWITCHIG
+ +
ANALOG IN + - - FRONT B L
DBCLK VOLUME
-
DIGITAL
+
PHONO MCLK ANA_IN
FILTER DAC
ASDATA ANA_HFP
CD
DLRCLK VOLUME DSP_FR
+ -
CDR/TAPE EX_FR
- + +
SERIAL DATA FRONT B R
DVD/VDP
PD/RST I/O PORT -
TV/DBS FROM MICOM SL SPK B
+
VOLUME EX_SL
VCR1
DIGITAL
DAC
VCR2 FILTER + +