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.
AVR-1806 / AVR-1816
CAUTION
Please heed the points listed below during servicing and inspection.
◎ Heed the cautions!
Spots requiring particular attention when servicing, such as
the cabinet, parts, chassis, etc., have cautions indicated on
labels or seals. Be sure to heed these cautions and the cautions indicated in the handling instructions.
◎ Caution concerning electric shock!
(1) An AC voltage is im pres se d on this set, so touching i nte r-
nal metal parts when the set is energized could cause
electric shock. T ake care to avoi d electric shock, by for example using an isolating transformer and gloves when
servicing while th e set is energ ized, unp lugging the powe r
cord when replacing parts, etc.
(2)There are high voltage parts i nside. Han dle with ex tra care
when the set is energized.
◎
Caution concerning disassembly and assembly!
Though grea t care is taken wh en manufacturin g parts from
sheet metal, there may in some rare cases be burrs on the
edges of parts which could cause injury if fingers are moved
across them. Use gloves to protect your hands.
◎ Only use designated parts!
The set's parts have specific safety properties (fire resistance, voltage resistance, etc.). For replacement parts, be
sure to use parts which have the sa me pro pert ies . In particular, for the important s afety parts that are marked ! on wiring
diagrams and parts li sts, be sure t o use t he d esignate d parts .
◎ Be sure to mount parts and arrange the
wires as they were originally!
For safety reasons, some parts use tape, tubes or other insulating materials, and some parts are mounted away from the
surface of printed circuit boards. Care is also taken with the
positions of the wires inside and clamps are used to keep
wires away from hea ting and h igh volta ge parts, so be sure to
set everything back as it was originally.
◎ Inspect for safety after servicing!
Check that all screws, parts and wires removed or disconnected for servicing hav e be en p ut ba ck in th ei r or ig ina l po si tions, inspect that no parts around the area that has been
serviced have been nega tively affected, c onduct an insulat ion
check on the external metal connectors and between the
blades of the power plug, and otherwise check that safety is
ensured.
(Insulation check procedure)
Unplug the power cord from the power outlet, disconnect the
antenna, plugs, etc., and turn the power switch on. Using a
500V insulation resis tance tester, check that t he insulation re sistance between t he term ina ls of the power plug and the ex ternally exposed metal parts (antenna terminal, headphones
terminal, microphone term inal, input ter minal, etc. ) is 1MΩ or
greater. If it is less, the set must be inspected and repaired.
CAUTION
Many of the electric and structural parts used in the set have
special safety properties. In most cases these properties are
difficult to distinguish by sight, and using replacement parts
with higher ratings (rated power and withstand voltage) does
not necessarily guara ntee that saf ety performance will be preserved. Parts with safety properties are indicated as shown
below on the wiring diagrams and parts lists is this service
manual. Be sure to replace them with pa rts with the des ignated part number.
(1) Schematic diagrams ... Indicated by the ! mark.
(2) Parts lists ... Indicated by the ! mark.
Concerning important safety parts
Using parts ot her than th e designat ed parts
could result in electric shock, fires or other
dangerous situations.
AV SURROUND RECEIVER initialization should be performed
when the µcom, peripheral parts of µcom , and Digital P.W.B. are
replaced.
1. Switch off the unit.
2. Hold the following SPEAKERS-A button and SPEAKERS-B
button, and switch on the unit.
3. Check that the entire display is flashing with an interval of
about 1 second, and rel ease you r fing ers from the 2 butto ns
and the microprocessor will be initialized.
Note:・If step 3 does not work, start over from step 1.
・ All user settings will be lost and this factory setting will
be recovered when this initialization mode.
So make sure to memorize your se ttin g for res tori ng
after the initialization.
34CKSTI/OClock switch transition period output/Demodulation master or slave function switching terminal
35INTI/OInterrupt output for µcom (Interrupt factor selectable)/Modulation or general I/O switching terminal
36RERROPLL lock error, data error flag output
37DOOµcom I/F, read out data output terminal (3-state)
38DIIµcom I/F, write data input terminal
39CEIµcom I/F, chip enable input terminal
40CLIµcom I/F, clock input terminal
41XMODEISystem reset input terminal
42DGND—Digital GND
43DVDD—Digital power
44TMCK/PIO0I/O256fs system clock input for modulation/General I/O in/output terminal
45TBCK/PIO1I/O64fs bit clock input for modulation/General I/O in/output terminal
46TLRCK/PIO2I/Ofs clock input for modulation/General I/O in/output terminal
47TDATA/PIO3I/OSerial audio data input for modulation/General I/O in/output terminal
48TXO/PIOENO/IModulation data output/ General I/O enable input terminal
* For latch-up countermeasure, perform each power supply ON/OFF in the same timing.
BD3811K1 (IC701)
IN31
IN32
IN41
IN42
IN51
IN52
IN61
IN62
IN71
IN72
IN81
IN82
INDVDSR
INDVDSL
INDVDC
INDVDSW
OUT2(+)
OUT2(-)
OUT1(+)
OUT1(-)
IN1DSP
IN1MIX
IN2DSP
IN2MIX
IN22
IN21
IN12
IN11
ROUT32
ROUT31
ROUT22
ROUT21
ROUT12
ROUT11
AGND10
GOUT2
OUTC
VIN2
LOGIC
OUTSL
80797877767574737271706968676665
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
2526
INDSPSR
5.1ch Mode SW2 DSP
2728293031323334353637383940
INDSPC
INDSPSL
5.1ch Mode SW2 DVD
AGND1
INDSPSW
GOUTSW
VINSW
AGND2
5.1ch Mode SW1
VINC
GOUTC
OUTSW
AGND9
TREBLE
BASS
BASS
BOOST
OUTSR
GOUT1
VINSL
VIN1
GOUTSL
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
TNF2
TNF1
BNF11
BNF21
BNF12
BNF22
BBNF2
OUT2
BBNF1
OUT1
AGND8
AGND7
VCC
AGND6
VEE
AGND5
MUTE
CL
DA
DGND
AGND4
GOUTSR
VINSR
AGND3
14
AD1837 (IC808)
AVR-1806 / AVR-1816
DSDATA3
DSDATA2
AGND
DGND
DSDATA1
39
38
37
36
35
34
33
32
31
30
29
28
27
NC
OUTL3
MCLKASDATAABCLKALRCLKODVDDDVDD DVDD
PD/RST M/S AVDD AVDD
CLOCK
DIGITAL
FILTER
DIGITAL
FILTER
DIGITAL
FILTER
DIGITAL
FILTER
DescriptionPin No.
DVDD
DBCLK
DLRCLK
M/S
AGND
OUTR4
NC
OUTL4
NC
AGND
AVDD
OUTR3
NC
V
Σ-∆
DAC
Σ-∆
DAC
Σ-∆
DAC
Σ-∆
DAC
REF
OUTL1
OUTR1
OUTL2
OUTR2
OUTL3
OUTR3
OUTL4
OUTR4
FILTD
FILTR
DLRCLK
DBCLK
DSDATA1
DSDATA2
DSDATA3
DSDATA4
ADCLP
ADCLN
ADCRP
ADCRN
AD1837 Terminal Function
Pin Name
CLATCH
PD/RST
Σ-∆
ADC
Σ-∆
ADC
AD1837
Input/
Output
DVDD
CIN
AGND
NC
OUTL1
NC
OUTR1
AGND
AVDD
NC
OUTL2
DGND
CCLK
COUT
ASDATA
ODVDD
MCLK
ALRCLK
ABCLK
50 494847 46 45 44 43 42 41 40
51
52
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15 16 17 18 19 20 21 22 23 24 25 26
NC
OUTR2
SERIAL DATA
I/O PORT
DIGITAL
FILTER
DIGITAL
FILTER
TOP VIEW
FILTD
FILTR
AGND
DGND AGND AGND AGND AGNDDGND
AVDD
DSDATA4
ADCLP
ADCLN
ADCRN
CINCLATCHCCLKCOUT
CONTROL PORT
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
ADCRP
1,39DVDDDigital Power Supply. Connect to digital 5V supply.
2CLATCHILatch Input for Control Data
33CINISerial Control Input
4PD/RSTIPower-Down/Reset
5,10,16,24,30,35AGNDAnalog Ground
6,12,25,31NCNot connected
7,13,26,32OUTLxODACx Left Channel Output
8,14,27,33NCNot connected
9,15,28,34OUTRxODACx Right Channel Output
11,19,29AVDDAnalog Power Supply. Connect to analog 5V supply.
17FILTDFilter Capacitor Connection. Recommend 10µF/100nF.
18FILTRReference Filter Capacitor Connection. Recommended 10µF/100nF.
20ADCLNIADC Left Channel Negative Input
21ADCLPIADC Left Channel Positive Input
22ADCRNIADC Right Channel Negative Input
23ADCRPIADC Right Channel Positive Input
36M/SIADC Master/Slave Select
37DLRCLKI/ODAC LR Clock
38DBCLKI/ODAC Bit Clock
40,52DGNDDigital Ground
41-44DSDATAxIDACx Input Data (Left and Right Supply)
45ABCLKI/OADC Bit Clock
46ALRCLKI/OADC LR Clock
47MCLKIMaster Clock Input
48ADVDDDigital Output Driver Power Supply
49ASDATAOADC Serial Data Output
50COUTOOutput for Control Data
51CCLKIControl Clock Input for Control Data
15
AVR-1806 / AVR-1816
LC75721E (IC 301) BU2090F (IC 302)
G7 G8G9
4833
49
DI
CL
CE
RES
DD
V
OSCI
OSCO
Vss
TEST
FL
V
G1
G2
G3
G4
G5
G6
64
AM 1
AM 2
AM 3
G10
G11
AA8/G12
AA7/G13
AA6/G14
AA5/G15
AA4/G16
AA3
AA2
AA1
AM35
AM34
AM33
161
AM 4
AM 5
AM 6
AM 7
AM 8
AM 9
AM 10
AM 11
AM 12
AM 13
AM 14
AM 15
AM 16
LC75721E Terminal Function
Symbol
32
17
AM 17
AM 18
AM 19
AM 20
AM 21
AM 22
AM 23
AM 24
AM 25
AM 26
AM 27
AM 28
AM 29
AM 30
AM 31
AM 32
V
DD
Vss
V
FL
DI
CL
CE
OSCI
OSCO
RES
AM1~AM35
AA1~AA3
AA4/G16
AA5/G15
AA6/G14
AA7/G13
AA8/G12
Power terminal +5V
Power terminal GND
Power terminal FL drive
Serial data transfer terminal