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-1707/1507/687/587/487
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 impressed on this set, so touching inter-
nal metal parts when the set is energized could cause
electric shock. Take care to avoid electric shock, by for example using an isolating transformer and gloves when
servicing while the set is energized, unplugging the power
cord when replacing parts, etc.
(2)There are high voltage parts inside. Handle with extra care
when the set is energized.
◎
Caution concerning disassembly and assembly!
Though great care is taken when manufacturing 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 same properties. In particular, for the important safety parts that are marked ! on wiring
diagrams and parts lists, be sure to use the designated 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 heating and high voltage 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 have been put back in their original positions, inspect that no parts around the area that has been
serviced have been negatively affected, conduct an insulation
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 resistance tester, check that the insulation resistance between the terminals of the power plug and the externally exposed metal parts (antenna terminal, headphones
terminal, microphone terminal, input terminal, 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 guarantee that safety 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 parts with the designated part number.
(1) Schematic diagrams ... Indicated by the ! mark.
(2) Parts lists ... Indicated by the ! mark.
Concerning important safety parts
Using parts other than the designated 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 release your fingers from the 2 buttons
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 setting for restoring
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.
LC75721E (IC301) BU2090F (IC302,1005,1008)
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
V
DD
Vss
AM 17
V
FL
AM 18
AM 19
AM 20
DI
AM 21
CL
AM 22
AM 23
CE
AM 24
AM 25
AM 26
OSCI
AM 27
OSCO
AM 28
AM 29
RES
AM 30
AM 31
AM1~AM35
AM 32
AA1~AA3
AA4/G16
AA5/G15
AA6/G14
AA7/G13
AA8/G12
G1~G11Grid output terminal
TESTLSI test terminal
Power terminal +5V
Power terminal GND
Power terminal FL drive
Serial data transfer terminal
DI: Data
CL: Clock
CE: Chip enable
External CR connecting terminal
System reset terminal
Anode output terminal
Anode/Grid output terminal
Function
VSS
DATA
CLOCK
LCK
1
CONTROL CIRCUIT
2
12-bi t SHIFT REGI STER
3
4
5
6
7
8
9
12- bit STRAGE REGI STER
OUTPUT BUFF ER (OPE N DRAI N)
Q0
Q1
Q2
Q4
18
17
16
15
14
13
12
11Q3
10
MM74LCX244 (IC809-811)
TOP VIEW
1
OE
2
I0
3
O4
4
I1
5
O5
6
I2
7
O6
8
I3
912
O7O3
1011
GND
20
VCC
19
OE2
18
O0
17
I4
16
O1
15
I5
14
O2
13
I6
I7
VDD
OE
Q11
Q10
Q9
Q8
Q7
Q6
Q5
19
AD1837AAS (IC808)
AVR-1707/1507/687/587/487
DSDATA2
DSDATA1
NC
AGND
CLOCK
DIGITAL
FILTER
DIGITAL
FILTER
DIGITAL
FILTER
DIGITAL
FILTER
DGND
DVDD
39
38
DBCLK
37
DLRCLK
M/S
36
AGND
35
34
OUTR4
33
NC
32
OUTL4
31
NC
30
AGND
29
AVDD
28
OUTR3
NC
27
OUTL3
MCLKASDATAABCLKALRCLKODVDDDVDD DVDD
PD/RST M/S AVDD AVDD
DescriptionPin No.
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
Σ-∆
ADC
Σ-∆
ADC
AD1837
Input/
Output
DVDD
CIN
PD/RST
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
CONTROL PORT
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
VOLUME
DSDATA3
ADCRP
CINCLATCHCCLKCOUT
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
20
BA7626 (IC1004,1016,1019 : for AVR1707/687 model)
2
SERIAL
IN
STROBE
Q
1
Q2
Q3
Q4
CLOCK
3
4
5
6
7
8
15
14
13
12
11
10
9
V
SS
1
OUTPUT
ENABLE
V
DD
Q6
Q7
Q8
Q'S
Q5
QS
16
(IC652,653 : for AVR1507/487 model)
BA7625 (IC651 : for AVR1507/487 model)
AVR-1707/1507/687/587/487
Monitor OUT
ABE
MONITOR OUT
LL*IN 1LL*
HL*IN 2HL*IN 2HL*
GND
IN5
GND
IN4
CTL E
IN3
CTL D
1
2
3
6dB
LOGIC
4
5
6
7
6dB
LOGIC
8
16
15
14
13
12
11
10
9
IN1
CTL A
V OUT1
Vcc
IN2
CTL B
V OUT2
CTL C
CDEV OUT 1CDEV OUT 2
⎯
LL*IN 1
⎯
LH*IN 3LH*IN 3LH*IN 3
HHLIN 4HHLIN 4HHLIN 4
HHHIN 5HHHIN 5HHHIN 5
Note 1: * mark means that feasible for either H or L.
Note 2: Each input terminal is provided with sink chip clamp (BA7625).
Each input terminal takes 20kohm at the end (BA7626).