Pioneer VSX-S300-K Service manual
2011
VSX-S300-K
AUDIO/VIDEO MULTI-CHANNEL RECEIVER
VSX-S300-K
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
Model Type Power Requirement Remarks
VSX-S300-K SYXCN8 AC 220 V to 230 V
VSX-S300-K DLXCN AC 220 V to 240 V
VSX-S300-K AXCN5 AC 220 V
ORDER NO.
RRV4197
PIONEER CORPORATION 1-1, Shin-ogura, Saiwai-ku, Kawasaki-shi, Kanagawa 212-0031, Japan
PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936
PIONEER CORPORATION
K-IZV AUG.
2011 Printed in Japan
1
WARNING
This product may contain a chemical known to the State of California to cause cancer, or birth defects or other reproductive
harm.
Health & Safety Code Section 25249.6 - Proposition 65
This service manual is intended for qualified service technicians; it is not meant for the casual do-ityourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained
to properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may
void the warranty. If you are not qualified to perform the repair of this product properly and safely, you
should not risk trying to do so and refer the repair to a qualified service technician.
1. SAFETY PRECAUTIONS
The following check should be performed for the
continued protection of the customer and service
technician.
LEAKAGE CURRENT CHECK
Measure leakage current to a known earth ground
(water pipe, conduit, etc.) by connecting a leakage
current tester such as Simpson Model 229-2 or
equivalent between the earth ground and all exposed
metal parts of the appliance (input/output terminals,
screwheads, metal overlays, control shaft, etc.). Plug
the AC line cord of the appliance directly into a 120 V
AC 60 Hz outlet and turn the AC power switch on. Any
current measured must not exceed 0.5 mA.
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL
SHOCK HAZARD AND MUST BE CORRECTED BEFORE
RETURNING THE APPLIANCE TO THE CUSTOMER.
2. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are
often not evident from visual inspection nor the protection
afforded by them necessarily can be obtained by using
replacement components rated for voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this Service Manual.
Electrical components having such features are
identified by marking with a > on the schematics and on
the parts list in this Service Manual.
The use of a substitute replacement component which
does not have the same safety characteristics as the
PIONEER recommended replacement one, shown in the
parts list in this Service Manual, may create shock, fire,
or other hazards.
Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PIONEER Service
Manual. A subscription to, or additional copies of,
PIONEER Service Manual may be obtained at a nominal
charge from PIONEER.
Leakage
current
tester
Reading should
not be above
0.5 mA
Device
under
test
Test all
exposed metal
surfaces
Also test with
plug reversed
(Using AC adapter
plug as required)
Earth
ground
AC Leakage Test
(FOR USA MODEL ONLY)
2 3 4
SAFETY INFORMATION
A
B
C
D
E
F
2
1
2 3 4
VSX-S300-K
5
6 7 8
CONTENTS
1. SERVICE PRECAUTIONS ....................................................................................................................................................4
1.1 NOTES ON SOLDERING...............................................................................................................................................4
1.2 NOTES ON REPLACING PARTS ................................................................................................................................... 4
2. SPECIFICATIONS ................................................................................................................................................................. 5
3. BASIC ITEMS FOR SERVICE .............................................................................................................................................. 6
3.1 CHECK POINTS AFTER SERVICING ........................................................................................................................... 6
3.2 JIGS LIST ....................................................................................................................................................................... 6
3.3 PCB LOCATIONS ...........................................................................................................................................................7
4. BLOCK DIAGRAM ................................................................................................................................................................8
4.1 OVERALL WIRING DIAGRAM ....................................................................................................................................... 8
4.2 OVERALL BLOCK DIAGRAM....................................................................................................................................... 10
4.3 D-MAIN BLOCK DIAGRAM ..........................................................................................................................................12
4.4 POWER SUPPLY BLOCK DIAGRAM........................................................................................................................... 14
5. DIAGNOSIS ........................................................................................................................................................................ 15
5.1 TROUBLESHOOTING..................................................................................................................................................15
5.2 PROTECT CIRCUIT .....................................................................................................................................................28
6. SERVICE MODE................................................................................................................................................................. 30
6.1 SERVICE MODE ..........................................................................................................................................................30
7. DISASSEMBLY ................................................................................................................................................................... 34
8. EACH SETTING AND ADJUSTMENT................................................................................................................................39
8.1 UPDATING OF THE FIRMWARE .................................................................................................................................39
9. EXPLODED VIEWS AND PARTS LIST............................................................................................................................... 44
9.1 PACKING SECTION .....................................................................................................................................................44
9.2 EXTERIOR SECTION .................................................................................................................................................. 46
10. SCHEMATIC DIAGRAM .................................................................................................................................................... 50
10.1 TUNER, BRIDGE2 and GUIDE ASSYS ..................................................................................................................... 50
10.2 MAIN ASSY (1/2)........................................................................................................................................................52
10.3 MAIN (2/2) and BRIDGE1 ASSYS.............................................................................................................................. 54
10.4 D-MAIN ASSY (1/4) .................................................................................................................................................... 56
10.5 D-MAIN ASSY (2/4) .................................................................................................................................................... 58
10.6 D-MAIN ASSY (3/4) .................................................................................................................................................... 60
10.7 D-M
10.8 D-AMP ASSY..............................................................................................................................................................64
10.9 FRONT, POWER and MIC ASSYS............................................................................................................................. 66
10.10 POWER TRANS ASSY............................................................................................................................................. 68
10.11 BT ASSY...................................................................................................................................................................70
11. PCB CONNECTION DIAGRAM........................................................................................................................................ 71
11.1 TUNER ASSY............................................................................................................................................................. 71
11.2 BRIDGE2 ASSY ......................................................................................................................................................... 72
11.3 GUIDE ASSY..............................................................................................................................................................73
11.4 MAIN and BRIDGE1 ASSYS...................................................................................................................................... 74
11.5 D-MAIN and UPDATE ASSYS .................................................................................................................................... 78
11.6 D-AMP ASSY..............................................................................................................................................................82
11.7 FRONT, POWER and MIC ASSYS............................................................................................................................. 86
11.8 P
11.9 BT ASSY.....................................................................................................................................................................90
11.10 CABLE and SHIELD ASSYS .................................................................................................................................... 91
12. PCB PARTS LIST .............................................................................................................................................................. 92
AIN (4/4) and UPDATE ASSYS............................................................................................................................ 62
OWER TRANS ASSY............................................................................................................................................... 88
A
B
C
D
E
F
VSX-S300-K
5
6 7 8
3
1
• For environmental protection, lead-free solder is used on the printed circuit boards mounted in this unit.
Be sure to use lead-free solder and a soldering iron that can meet specifications for use with lead-free solders for repairs
accompanied by reworking of soldering.
• Compared with conventional eutectic solders, lead-free solders have higher melting points, by approximately 40 ºC.
Therefore, for lead-free soldering, the tip temperature of a soldering iron must be set to around 373 ºC in general, although
the temperature depends on the heat capacity of the PC board on which reworking is required and the weight of the tip of
the soldering iron.
Do NOT use a soldering iron whose tip temperature cannot be controlled.
Compared with eutectic solders, lead-free solders have higher bond strengths but slower wetting times and higher melting
temperatures (hard to melt/easy to harden).
The following lead-free solders are available as service parts:
• Parts numbers of lead-free solder:
GYP1006 1.0 in dia.
GYP1007 0.6 in dia.
GYP1008 0.3 in dia.
The part listed below is difficult to replace as a discrete component part.
When the part listed in the table is defective, replace whole Assy.
HDMI Receiver ——————
J080320788010-IL
IC with heat-pad
IC1324 Audio DSP System IC IC with heat-pad
Assy Name
D-MAIN Assy
IC1303
Ref No. Function Part No.
Parts that is Difficult to Replace
Remarks
2 3 4
1. SERVICE PRECAUTIONS
1.1 NOTES ON SOLDERING
A
B
C
D
1.2 NOTES ON REPLACING PARTS
E
F
4
1
2 3 4
VSX-S300-K
5
Audio section
Rated power output
Front, Center, Surround
..............................100 W per channel (1 kHz, 4 Ω, 1 %)
Subwoofer ............................... 100 W (30 Hz, 4 Ω, 1 %)
Total Harmonic Distortion
.............................. 0.06 % (20 Hz to 20 kHz, 8 Ω, 50 W/ch)
Frequency response (ANALOG Pure Direct mode)
.............................................................. 10 Hz to 20 kHz dB
Guaranteed speaker impedance ........................ 4 Ω to 16 Ω
Input (Sensitivity/Impedance) ....................... 200 mV/47 kΩ
Signal-to-Noise Ratio (IHF, short circuited, A network)
.................................................................................... 90 dB
Video section
Signal level (Composite).................................1 Vp-p (75 Ω)
Tuner section
Frequency Range (FM) .....................87.5 MHz to 108 MHz
Antenna Input (FM)................................... 75 Ω unbalanced
Frequency Range (AM) ...................... 531 kHz to 1602 kHz
Antenna (AM) ................................................ Loop antenna
Digital In/Out section
HDMI terminal .............................................. Type A (19-pin)
HDMI output type............................................... 5 V, 100 mA
ADAPTER PORT terminal................................. 5 V, 100 mA
Miscellaneous
Power Requirements
.................... AC 220 V to 230 V, 50 Hz/60 Hz (SYXCN8)
AC 220 V to 240 V, 50 Hz/60 Hz (DLXCN)
AC 220 V, 50 Hz/60 Hz (AXCN5)
Power Consumption ..................................................... 70 W
In standby..........0.5 W (Control with HDMI function: ON)
0.45 W (Control with HDMI function: OFF)
Dimensions............ 435 mm (W) x 85 mm (H) x 317 mm (D)
Weight (without package)..........................4.2 kg (SYXCN8)
4.2 kg (DLXCN)
4.3 kg (AXCN5)
Furnished P
arts (for SYXCN8)
Microphone (for Auto MCACC setup) ................................. 1
Remote control ................................................................... 1
Dry cell batteries (AAA size IEC R03) ................................ 2
AM loop antenna ................................................................ 1
FM wire antenna................................................................. 1
Warranty card..................................................................... 1
Power cord.......................................................................... 1
Quick start guide ................................................................ 1
Safety Brochure.................................................................. 1
Operating instructions ........................................................ 1
Note
• The specifications are applicable when the power supply
is 230 V/50 Hz.
• Specifications and the design are subject to possible
modifications without notice, due to improvements.
Accessories
Remote control
(8300763100010-IL)
AM loop antenna
(E601019000010-IL)
FM wire antenna
(E605010140010-IL)
Power cord (SYXCN8, DLXCN only)
(L068250160020-IL)
Dry cell batteries
(AAA size IEC R03) x2
Operating instructions
(DLXCN: 5707000005660-IL)
(AXCN5: 5707000005650-IL)
Safety Brochure (SYXCN8 only)
(5707000005850-IL)
Warranty card EU
(SYXCN8, AXCN5 only)
Quick start guide (SYXCN8 only)
(5707000005630-IL)
Disk CD Manual (SYXCN8 only)
(6517000000331-IL)
Microphone (for Auto MCACC setup)
(APM7008)
2. SPECIFICATIONS
6 7 8
A
B
C
D
E
5
VSX-S300-K
6 7 8
F
5
1
Items to be checked after servicing
To keep the product quality after servicing, confirm recommended check points shown below.
See the table below for the items to be checked regarding video and audio.
No.
Item to be checked regarding video Item to be checked regarding audio
Procedures Check points
1 Confirm whether the customer complain has been solved.
If the customer complain occurs with the particular source, such
as Dolby Digital, DTS, AAC, DVD-A and HDMI, input it for the
operation check.
The customer complain must not be reappeared.
Video, Audio and operations must be normal.
2 Check the analog audio playback.
(Make the analog connections with a DVD player.)
Each channel audio and operations must be normal.
3 Check the digital audio playback.
(Make the digital connections with a DVD player.)
Each channel audio and operations must be normal.
4 Check surround playback.
(Select Surround mode and check the multichannel operations
via the DSP circuit.)
Each channel audio and operations must be normal.
5 Check the video outputs.
(Connect with a DVD player.)
Video and operations must be normal.
6 Check the tuner (AM and FM) operations. Audio and operations must be normal.
7 Check the sound from headphone output. Sound must be normal, without noise.
8 Check the appearance of the product.
Block noise Distortion
Horizontal noise Noise
Flicker Volume too low
Disturbed image (video jumpiness) Volume too high
Too dark Volume fluctuating
Too bright Sound interrupted
Mottled color
No scratches or dirt on its appearance after receiving it for
service.
Jigs List
Jig Name Part No. Remarks
RS-232C update jig (Jig + 10P FFC) GGF1642
10P to 8P FFC GGD1676
Firmware update (RS-232C ↔ Rear panel)
RS-232C cable (9-pin to 9-pin, straight cable)
Board to board extension jig cable (29P + 15P) GGD1755 Diagnosis (D-MAIN Assy ↔ TUNER Assy)
Board to board extension jig cable (19P + 9P) GGD1756 Diagnosis (D-MAIN Assy ↔ MAIN Assy)
Board to board extension jig cable (13P) GGD1757 Diagnosis (MAIN Assy ↔ POWER TRANS Assy)
Board to board extension jig cable (11P) GGD1758 Diagnosis (MAIN Assy ↔ D-AMP Assy)
2 3 4
3. BASIC ITEMS FOR SERVICE
3.1 CHECK POINTS AFTER SERVICING
A
B
C
D
3.2 JIGS LIST
E
F
6
1
2 3 4
VSX-S300-K
5
D
MAIN ASSY
A
TUNER
ASSY
I
FRONT ASSY
K
MIC ASSY
N
CABLE ASSY
F
D-MAIN ASSY
B
BRIDGE2 ASSY
H
D-AMP
ASSY
O
SHIELD
ASSY
C
GUIDE ASSY
M
BT ASSY
E
BRIDGE1 ASSY
G
UPDATE ASSY
L
POWER
TRANS
ASSY
J
POWER
ASSY
NSP 1..PCB TTL Assy D-AMP 7025HK1022011-IL
2..D-AMP Assy 7028070661020-IL
2..UPDATE Assy 7028070663010-IL
NSP 1..PCB TTL Assy FRONT 7025HK1022014-IL
2..FRONT Assy 7028070651020-IL
2..POWER Assy 7028070652020-IL
2..MIC Assy 7028070653020-IL
NSP 1..PCB TTL Assy MAIN (SYXCN8) 7025HK1022040-IL
NSP 1..PCB TTL Assy MAIN (DLXCN, AXCN5) 7025HK1022010-IL
2..MAIN Assy (SYXCN8) 7028070671070-IL
2..MAIN Assy (DLXCN, AXCN5) 7028070671040-IL
2..BRIDGE1 Assy 7028070672020-IL
2..CABLE Assy 7028070673020-IL
2..SHIELD Assy 7028070674010-IL
NSP 1..PCB TTL Assy TUNER (SYXCN8) 7025HK1022043-IL
NSP 1..PCB TTL Assy TUNER (DLXCN, AXCN5) 7025HK1022013-IL
2..TUNER Assy (SYXCN8) 7028070691040-IL
2..TUNER Assy (DLXCN, AXCN5) 7028070691030-IL
2..GUIDE Assy 7028070693010-IL
2..BRIDGE2 Assy 7028070694010-IL
NSP 1..PCB TTL Assy D-MAIN 7025HK1022046-IL
2..D-MAIN Assy 7028070684010-IL
NSP 1..PCB TTL Assy BT 7025HK1023015-IL
2..BT Assy 7028070231070-IL
> 1..POWER TRANS Assy 8208000920022-IL
Mark No. Description Part No. Mark No. Description Part No.
LIST OF ASSEMBLIES
NOTES: - Parts marked by “NSP” are generally unavailable because they are not in our Master Spare Parts List.
-
The > mark found on some component parts indicates the importance of the safety factor of the part.
Therefore, when replacing, be sure to use parts of identical designation.
3.3 PCB LOCATIONS
6 7 8
A
B
C
5
VSX-S300-K
6 7 8
D
E
F
7
1
D
M
(S
(D
H
D-AMP ASSY
(7028070661020-IL)
I
FRONT ASSY
(7028070651020-IL)
L
POWER TRANS ASSY
(8208000920022-IL)
N
CABLE ASSY
(70280706730
O
SHIELD ASSY
(7028070674010-IL)
AC IN
CN1
CN117
CN403
CN241
CN811
CN243 CN242
CN111
CP105
CP106
CP107
CN119
CN108
CN102
CN101
CN104
CN281
CN704A
CN702
CN704B
CP706
CN402
CN601
CN108
(702807
B
BRIDGE2 ASSY
(7028070694010-IL)
J
POWER ASSY
(7028070652020-IL)
K
MIC ASSY
(7028070653020-IL)
C
GUIDE ASSY
(7028070693010-IL)
2 3 4
4. BLOCK DIAGRAM
4.1 OVERALL WIRING DIAGRAM
A
B
C
D
E
F
8
1
2 3 4
VSX-S300-K
5
F
D-MAIN ASSY
(7028070684010-IL)
F
1/4-F4/4
D
MAIN ASSY
(SYXCN8: 7028070671070-IL)
(DLXCN, AXCN5: 7028070671040-IL)
D
1/2-D2/2
A
TUNER ASSY
(SYXCN8: 7028070691040-IL)
(DLXCN, AXCN5: 7028070691030-IL)
E
BRIDGE1 ASSY
(7028070672020-IL)
CABLE ASSY
(7028070673020-IL)
CP105
CP106
CP107
CN119
CP603
CN106
CN120
CN121
CN110
CN109
CN112
CP101
CN103
CN118
CP1300
CN115
CP1306
CP1307 CP1305
CP1304
CP104 CP102
CN108
CN102
CN101
CP705
M
BT ASSY
(7028070231070-IL)
G
UPDATE ASSY
(7028070663010-IL)
-
When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".
-
The > mark found on some component parts indicates the impor tance of the safety factor of the part.
Therefore, when replacing, be sure to use parts of identical designation.
-
: The power supply is shown with the marked box.
6 7 8
A
B
C
D
E
F
5
6 7 8
VSX-S300-K
9
1
F
D-MAIN ASSY
D
MAIN ASSY
I
FRONT ASSY
2 3 4
4.2 OVERALL BLOCK DIAGRAM
A
B
C
D
E
F
10
1
2 3 4
VSX-S300-K
H
D-AMP ASSY
FRONT ASSY
K
MIC ASSY
5
6 7 8
A
B
C
D
E
F
VSX-S300-K
5
6 7 8
11
1
4.3 D-MAIN BLOCK DIAGRAM
A
B
2 3 4
C
D
E
F
12
1
2 3 4
VSX-S300-K
5
F
D-MAIN ASSY
6 7 8
A
B
C
D
E
F
VSX-S300-K
5
6 7 8
13
1
MAIN POWER
PVDD(36V/7A)
BT/USB_+5.6V(1A)
SUB POWER
RLY/ADC/AMP +12V(0.2A)
AUDIO_-12V(0.1A)
-12V REGULATOR
+12V_VIDEO/+12V(0.2A)
DSP_+5V(0.5A)
VFD
FL_+42V
FL_ +/- AC3.8V
POWER
MAIN_MICOM_+3.3V(0.1A)
HDMI_+3.3V(1.5A)
DSP_+3.3V(1A)
CPU_+5V(0.1A)
MAIN_CONTROL_1
MAIN_CONTROL_2
MAIN_CONTROL_3
HDMI_+5V(0.5A)
FET_SWITCH
FET_SWITCH
FET_SWITCH
TR_SWITCH
FET_SWITCH
+12V REGULATOR
+3.3V REGULATOR
FET_SWITCH
CHOPPER
(+3.3V)
POWER SENSE
AC-LINE
PHOTO COUPLER
+5.6V
+15V
FET_SWITCH
MAIN_CONTROL_4
1 2
1 2
1 2
L
POWER TRANS ASSY
2 3 4
4.4 POWER SUPPLY BLOCK DIAGRAM
A
B
C
D
E
F
14
VSX-S300-K
1
2 3 4
5. DIAGNOSIS
The unit does not operate.
Ye s
Ye s
Failure in the infrared receiver for the remote control unit
or the path from the infrared receiver to the MAIN UCOM
In rare cases, failure in the remote control unit
Insert the update jig to the write terminal of
the MAIN UCOM with the device’ s power
set to OFF.
Then, after holding the Reset button on the
board of the update jig pressed for 10 sec or
more, pull the device out while still holding
the Reset button pressed, in order to discharge
the unit’ s internal electrical charge.
Perform the same procedure for the SUB UCOM.
Ye s
Keys on the remote
control unit
Failure in the switches for the main unit’ s keys or
failure on the path from the keys to the MAIN UCOM
Keys on the main unit
To “No power” on the Initial Check sheet
Reset the unit
(possibility of microcomputer runaway).
Ye s
To the corrective actions against PVDD errors
Finished
Check the operation log then finish.
Ye s
Ye s
A temporary error, such as overheating
and short-circuiting of a speaker cable,
may be the case.
Failure in updating of the microcomputer
in the past may be the case.
No
No
No
No
[1] Initial Check
Does the unit respond
to the keys on either the remote
control unit or on the unit?
Can the unit be
reset by pressing the specified keys
simultaneously?
Can the unit be turned on
forcibly?
No
Can a protection-operation log be
displayed? (See the list of keys to
be pressed simultaneously.)
No
Can the unit be turned on
forcibly? (See the list of keys to
be pressed simultaneously.)
To which keys does the unit
not respond?
Can the unit be operated?
No power
Ye s
Ye s
Abnormal power voltage (PVDD: +36 V
or ±12 V) may be the case.
To corrective actions against errors
recorded in each log
Ye s
To the corrective actions against
PVDD errors
To “[5] No power”
Check the protection-operation
log then finish.
No
No
No
Can the unit be
turned off then back on again,
repeatedly?
Ye s
Has the value of the
counter increased?
Can the unit be turned on
when the bonnet of the unit
cools down?
After resetting, can the unit be
turned on? (See the list of keys to
be pressed simultaneously.)
Ye s
5.1 TROUBLESHOOTING
5
6 7 8
A
B
C
D
5
VSX-S300-K
6 7 8
E
F
15
A
No audio/video
Ye s
Ye s
Correct the settings.
DC-2
A protection operation is prone to be activated if the volume is 0 or higher or
the CH level of the subwoofer is set to high.
As the DC is slightly prone to be detected when the SP-B or Bi-Amp is set to
other than Normal, give advice to the user to return those settings to Normal.
No
Correct the settings.
The peripheral device, after replacement of
which the signal can be output, is defective.
Disconnect the speakers.
Replace the MAIN Assy.
Product exchange
DC
The unit is defective.
DC-
3
Replace the corresponding connector.
No
No
Are the I/O settings for the
receiver correct?
Are the settings
for the source equipment and
monitor correct?
No No
No
Ye s
DC-
1
Replace the AMP IC of the corresponding channel.
Ye s
*Points to be checked for DC
Replace the D-AMP Assy.
Ye s
Is there breakage in the connected
connector? (Check conduction
between Surfaces B of the boards.)
Is DC output from the SP terminal?
(Attach a probe then observe the
probe as soon as forcibly turning
the unit on.)*
No
Does the unit
operate properly if no signal
is input?
Is the problem
resolved after the D-AMP Assy
is replaced?
Replace the MAIN UCOM.
No
No
No
Is the problem
resolved after the MAIN Assy
is replaced?
Is the problem
resolved after the MAIN UCOM
is replaced?
Is it OK to input the
signals with the volume set to
approx. -20?
Ye s
Ye s
Ye s
Ye s
Ye s
Can the signal be output after any
of the following is replaced:
Monitor TV,
source equipment,
source media (disc, etc.),
speakers, cables,
and Bluetooth adapter?
Corrective Actions to be Taken against Each Error Indication on the Protection-Operation Log
1 The Amp IC was damaged and DC is output to the SP terminal.
2 Excessively strong signals were output successively.
3 Improper connection
4 Other failure
[2] Solution of error
1
2 3 4
B
C
D
E
F
16
1
VSX-S300-K
2 3 4
5
SLSL SRSR SWSW C FLFL FRFR
This error may not be the main cause of
the problem, and there may be other
abnormality.
TEMP
TEMP-2
Replace the corresponding connector.
No
*Points to be checked for DC
Ye s
TEMP-1
To corrective actions against items other than
TEMP in the protection-operation log (A log of SD may exist.)
Ye s
Is there breakage in the connected
connector? (Check conduction
between Surfaces B of the boards.)
TEMP-1
The unit may have been successively used in a
high-temperature environment. Give advice to the user about
ventilation of the unit at the installation location and normal
volume level.
No
Ye s
Did the user complain that the
volume had automatically decreased
to -20 dB while listening?
Is there any abnormality other than
that of the temperature recorded in
the protection-operation log?
No
1 Overheating (increase in the temperature of the
IC from 125°C to 155°C) was detected.
2 Improper connection
Note: With the above abnormalities, the unit can be turned on.
6 7 8
A
B
C
D
E
F
VSX-S300-K
5
6 7 8
17
1
SD-4
Replace the D-AMP Assy.
SD
No
No
No
Ye s
Ye s
Ye s
SD-3
Replace the corresponding connector.
Ye s
Short-circuiting of core wires of the SP cable:
Several of the core wires (intertwined fine
conducting wires) of an SP cable are frayed
and touching the SP terminals or the chassis,
causing short-circuiting.
SD-2
Remove the cause of the error.
SD-2
Replace the corresponding AMP IC.
Ye s
Ye s
SD-2
Recommend that the user use a speaker
whose impedance is 4 ohms or higher or give
the user advice to use the amp at decreased
volume level.
SD-3
Replace the corresponding connector.
SD-4
As the corresponding ICs may be defective,
replace the Amp IC.
Ye s
Ye s
SD-1
Advice on how to use
Is there breakage in the connected
connector? (Check conduction
between Surfaces B of the boards.)
Ye s
Ye s
Replace the MAIN UCOM.
Ye s
Remove the series resistors of
the SD port of the AMP ICs, one by
one, then check if the unit can be
turned on (three ICs).
No
No
Is there a log on activation
of the protection operation against
high temperature.
Is the impedance
of the connected speaker less
than 4 ohms?
No
No
No
Replace the MAIN Assy.
No
Product exchange
No
Is the problem
resolved after the D-AMP Assy is
replaced?
Is the problem
resolved after the MAIN Assy is
replaced?
Is the problem
resolved after the MAIN UCOM is
replaced?
Are the SP terminals or the SP terminal
and GND (or the chassis) short-circuited
by an SP cable or any foreign object?
(Including short-circuiting of core wires
of the SP cable)
Is the installation location appropriate
from the viewpoint of heat dissipation?
Is the volume too high during
operation? (Is the level too high, and
will sound be distorted because
of output saturation?)
Is the production lot No. of the
product 3000 or lower and does the
lot No. of the Amp IC begin with 12?
(only SYXCN8, DLXCN model)
1 An abnormally high temperature (temperature of the IC of 155°C or higher) was detected.
2 Excess current was detected.
3 Improper connection
4 Other failure
No
0
0
R772
100
R773
100
111213141516
1718192021
INPUT_D
FREQ_ADJ
OSC_IO+
OSC_IO-
M2
M1
SD
OTW1
CLIP
READY
17:OTW2
R624
R627
100
R629
100
R631
100
R637
-
Is there breakage in the connected
connector? (Check conduction
between Surfaces B of the boards.)
2 3 4
A
B
C
D
E
F
18
1
2 3 4
VSX-S300-K
5
PVDD
Ye s
PVDD-4
Replace the corresponding connector.
Ye s
PVDD-4
Replace the corresponding connector.
Ye s
Ye s Yes
PVDD-12
Replace the POWER TRANS Assy.
PVDD-1
Replace all three AMP ICs, since identifying
a defective IC is difficult.
No
No
No
No
No
Is there breakage in the connector
that connects the POWER TRANS
Assy and MAIN Assy (pins for ±12 V,
PVDD, and GND)? (Check conduction
between Surfaces B of the boards.)
Is there breakage in the connector
(wire) that connects the POWER
TRANS Assy and D-AMP Assy
(pins for ±12 V, PVDD, and GND)?
(Check conduction between Surfaces
B of the boards.)
Is the problem
resolved after the POWER TRANS
Assy is replaced?
PVDD-5
Replace the D-AMP Assy.
Replace the MAIN UCOM.
Product exchange
±12V
Check Point
No
No
No
No
No
Ye s
Ye s
Replace the MAIN Assy.
PVDD-2
Replace the corresponding IC.
Ye s
Is the problem
resolved after the MAIN UCOM is
replaced?
As the unit may not be turned on in a normal way during
analysis, the unit must be forcibly turned on by pressing the
corresponding keys simultaneously, after which an instant
check is required.
Is the problem
resolved after the D-AMP Assy is
replaced?
Is the problem
resolved after the MAIN Assy is
replaced?
Is the problem
resolved after the AMP IC is
replaced?
Ye s
Is the voltage of ±12 V
power OK?
Is there any IC whose temperature
is abnormally high among the ICs
that are connected to ±12-V power?
R487
100
R485
4K7
R481
4K7
C460 47/25
C462
-
C459 10N-K
C458-C457
47/25
C456
10N-K
R483100
D2401
UDZ7.5B
D2402
UDZ7.5B
470K
470K
R223
0
R227
470
C453
470P-J
C450
-
Q156
KTA1281Y
C451
-
C454
2.2/50
C455
2.2/50
470K
C452
470P-J
Q154
KTC3209Y
Ye s
PVDD-3
Abnormal temperature detected in the
POWER TRANS Assy
Is the unit turned ON and
does it continue to be ON by
forced power-on?
Decrease the volume.
Check the installation conditions of the
unit and correct any problem found.
This is not a failure.
1 Voltage error of the power PVDD (+36 V) for the amp
2 Voltage error of ±12 V
3 Temperature abnormality in the POWER TRANS Assy
4 Failure in connectors
5 Other failure
6 7 8
A
B
C
5
VSX-S300-K
6 7 8
D
E
F
19
1
No sound
No No
No
No
No
No
No
No
No
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Sound output, depending
on the type of input signals
SP setting
FRONT: LARGE
Other settings: NO
Audio mode
Analog AUX in
Pure Direct Mode
SP switching
SP-AB: A
SP setting
FRONT: SMALL
SW: YES
Audio mode
Analog AUX in
AUTO SURR
The problem is not caused by
the input sources.
[Failure on the common paths]
• Power Amp (D-AMP Assy)
• AMP input buffer
• E-VOL IC (MAIN Assy)
Sound of any
signal not output
VSX-S500 only
Sound of all
signals output
[Failure in the individual analog-signal paths]
• Failure in an individual input board
• Defective connection on the path from each input
board to the MAIN Assy (E-VOL IC)
• In rare cases, failure in the E-VOL IC
[Failure on the ARC path]
• HDMI TRANSMITTER: IC1308
• CODEC
• Failure on the path between the above-mentioned
ICs (D-MAIN Assy)
[Failure on the NETWORK-system common paths]
• Periphery of the UBICOM IC (Replace the whole
ASSY, because the UBICOM IC alone cannot be
supplied.)
• Peripheries of the path from the UBICOM to
CODEC ICs (D-MAIN Assy)
[Failure on the HDMI common paths]
• HDMI RECEIVER (D-MAIN Assy)
Sound output, depending
on the type of input signals
[Failure on the A/D path]
• Failure in connection between the MAIN Assy and
D-MAIN Assy
• Peripheries of CODEC and DSP ICs (D-MAIN Assy)
• DAC filter circuit (MAIN Assy)
No sound (diagnosis from the input side)
Is sound of the analog AUX
input signal not output?
Is sound of the
analog AUX, TUNER, BT, Portable
input signals output?
Is sound of the
OPT/COAX (Digital In)
signal output?
Which is the HDMI audio
output mode?
Is sound of the NETWORK,
USB, iPod input signals
output?
Sound of which input signal
is not output?
Is sound output from the
front speaker?
[Failure on the DSP or D/A path]
• Failure in connection between the MAIN Assy and
D-MAIN Assy
• Peripheries of CODEC and DSP ICs (D-MAIN Assy)
• DAC filter circuit (MAIN Assy)
AMP
[Failure on the HDMI audio paths]
• DSP input switch
• Peripheries of the path from the HDMI RECEIVER
to CODEC ICs (D-MAIN Assy)
[Failure on the digital input path]
• Periphery of the input buffer
• CODEC (D-MAIN Assy)
Is sound output from the
front speaker?
[Problem in use]
Change to AMP mode.
THRUOGH
iPod USB
[Failure on the USB input path]
• Failure in connection between the USB Assy and
D-MAIN Assy
• Failure in the USB Assy
• Failure in USB power (POWER TRANS Assy)
[Failure on the Ethernet input path]
• Periphery of the Ethernet IC (D-MAIN Assy)
Ethernet
[Failure in Consumer Electronics Control]
See “Failure in Consumer Electronics Control.”
Is the audio signal input
to each HDMI connector
output?
Is sound of the ARC signal
(signal from the TV that is
connected via HDMI) output?
Is sound of the signal from the
TV input (OPT) connector that is
interlocked with the HDMI CTRL
output?
Is a video signal
of the HDMI input
displayed?
[3] No Sound
A
2 3 4
B
C
D
E
F
20
1
2 3 4
VSX-S300-K
[Failure in the HP relay or the control system]
• Periphery of the HP Relay (MAIN Assy)
• Periphery of the HP Detect (MAIN Assy)
• Failure in connection between the HP Assy and
MAIN Assy
No sound from the headphones
No
No
[Failure in the HP Amp or the output path]
• HP Amp IC (MAIN Assy)
• Failure in connection between the HP Assy and
MAIN Assy
Ye s
Ye s
No
Ye s
No
Ye s
No sound (diagnosis from the output side)
Is an operation sound (click) of the HP relay heard
when the headphones plug is connected?
(Only the HP relay sound must be
heard when SP-AB is set to OFF.)
[Problem in use]
Change to the proper settings, referring to the operating
instructions.
Only the sound of a particular channel
cannot be output [Common]
(SP-AB: Other than OFF)
[Failure in individual channels]
• Peripheries of the DSP and CODEC ICs
(D-MAIN Assy)
• D/A filter, E-Vol, Amp Buffer (MAIN Assy)
• D-Amp IC, SP Relay (D-AMP Assy)
In the SP SYSTEM and SP SETTING
settings, are the channels whose audio
signals you wish to output from PRE OUT
connectors assigned?
[Problem in use]
Change to the proper settings, referring to the operating
instructions.
No sound from PRE OUT
AMP
THRUOGH
[Problem of the PRE OUT path]
• Failure on the path from the E-VOL IC to the
PRE OUT jack (MAIN Assy)
Which is the HDMI audio output mode?
Is the Digital Video Converter set to ON?
No sound only from the subwoofer
[specific problem]
[Failure on the common paths of the subwoofer]
• Periphery of the SW Gain Amp (IC122)
• Peripheries of the LFE Mix Amp (IC103, 104)
(MAIN Assy)
[Failure on the SW AMP path]
• Periphery of the diode limiter
• PreGain Buffer (IC107)
• Periphery of the SP Assign IC (IC108)
(MAIN Assy)
Is a signal output from the
SUBWOOFER PRE OUT connector?
No sound only from the FRONT
L/R connectors [specific problem]
[Failure in the LFE Mix Amp]
• Peripheries of the LFE Mix Amp (IC103, 104)
(MAIN Assy)
Only sound of the specific channels
cannot be heard when Bi-AMP or SB
Normal is set [specific problem]
[Failure on the AMP Assign path]
• Periphery of the SP Assign IC (IC108)
(MAIN Assy)
No sound of the audio input other than
HDMI input from the TV which is
connected with this unit using the
HDMI cable
[Problem in use]
Change to THROUGH mode.
OFF
[Problem in use]
Set the DVC to ON. (Note that the audio input
signals other than HDMI input are interlocked with
the DVC.)
[Failure on the ARC path]
• HDMI TRANSMITTER: IC1308
• CODEC
• Failure on the path between the
above-mentioned ICs (D-MAIN Assy)
ON
VSX-S500 only
In the SP SYSTEM and SP SETTING
settings, are the channels whose audio
signals you wish to output from PRE OUT
connectors assigned?
5
6 7 8
A
B
C
D
5
VSX-S300-K
6 7 8
E
F
21
1
No image
Diagnosis with the Digital Video Converter set to OFF
or on the VSX-S300
[4] No Picture
[Failure common to all analog video signals]
• Analog Video IC: IC101
• Power for Video IC: IC115 (MAIN Assy)
Composite Monitor Out
Neither displayed
No No
Ye s
[Failure on the input paths]
• Failure on the path from the Video IC to
the Composite Video In jack
• Analog Video IC: IC101 (MAIN Assy)
[Failure in the OSD IC]
• OSD IC : IC102 (MAIN Assy)
OSD
[Failure in the HDMI input IC]
• HDMI RECEIVER: IC1303
(D-MAIN Assy)
[Failure in the HDMI video output]
• HDMI TRANSMITTER: IC1308
(D-MAIN Assy)
No image from
some HDMI input
connectors
[Failure on the HDMI input path]
• Failure on the path from the input
connector to the HDMI receiver
(D-MAIN Assy)
[Failure in the Video Scaler]
• Video Scaler IC: IC1311
(D-MAIN Assy)
Are neither the signal of
Composite Video In nor OSD
for Setup displayed?
HDMI Out
Are images of input
signals to any HDMI
connector not displayed?
Is the audio signal
input to each HDMI
connector output?
Which one is not displayed?
One displayed
Is the Input Assign
setting for the composite video
correct?
Composite Video In
[Problem in use]
Change to the proper settings, referring to the
operating instructions.
NG
OK
[Failure on the NETWORK-system common paths]
• Periphery of the UBICOM IC (Replace the whole
ASSY, because the UBICOM IC alone cannot be
supplied.)(D-MAIN Assy)
GUI display for controls for
NETWORK, iPod, and USB
Neither displayed
[Failure on the input paths]
• Failure on the path from the Video IC to the
Composite Video In jack
• Analog Video IC: IC101 (MAIN Assy)
[Failure in the Video D/A]
• Video Encorder IC: IC3011 (D-MAIN Assy)
• Failure on the path from the D-MAIN Assy
(IC3011) to the MAIN Assy (IC102)
Composite
Are video signals from neither
the HDMI OUT nor Composite
Monitor OUT displayed?
Which one is not displayed?
One displayed
Is the Input Assign setting
for the composite video
correct?
HDMI
[Problem in use]
Change to the proper settings, referring to the
operating instructions.
NG
OK
Diagnosis with the Digital Video Converter set to ON or only on the VSX-S500 (This
section must be performed after a diagnosis performed with the DVC set to OFF.)
HDMI in → HDMI Out
[Failure in the Video A/D]
• Video Decorder IC: IC1302 (D-MAIN Assy)
• Failure on the path from the D-MAIN Assy
(IC3011) to the MAIN Assy (IC102)
Analog (Video In, OSD)
→ HDMI Out
A
2 3 4
B
C
D
E
F
22
1
2 3 4
VSX-S300-K
5
[5] No Power
No power (or Voltage Error)
Ye s
Ye s
Ye s
Ye s
No Power
(Before this diagnosis, be sure to perform the Initial Check.)
Remove the foreign object.
Product exchange
After replacement of the POWER
TRANS Assy, turn the unit on.
Replace the D-AMP and POWER
TRANS Assys.
Ye s
Replace all three AMP ICs, since
identifying a defective IC is difficult.
No
No
No
No
Product exchange
Product exchange
No
No
No
Replace the D-AMP Assy.
Replace the POWER TRANS Assy.
No
Replace the corresponding
connector.
Repair the corresponding circuit.
Replace the peripheral circuits of
the MAIN UCOM or X’ tal.
NG
NG
Replace the MAIN Assy.
OK
Replace the MAIN Assy.
No
No
Replace the D-MAIN Assy.
No
Finished
No
Does the fuse (F811)
become open on the POWER
TRANS Assy?
Has any foreign object
entered inside the unit?
Ye s
Ye s
Is the problem resolved
after the D-AMP Assy
is replaced?
Ye s
Ye s
Ye s
Repair the corresponding circuit.
Ye s
Replace the TUNER Assy.
Ye s
OK
Is there breakage in the connector
that connects the POWER TRANS
and MAIN Assys? (Check conduction
between Surfaces B of the boards.)
Ye s
Ye s
Can the unit be turned on after
disconnecting the cable between
the POWER TRANS Assy and
D-AMP Assy?
Does the fuse become
open again?
Is the problem resolved
after the D-AMP Assy is
also replaced?
Is the problem resolved
after the POWER TRANS
Assy is replaced?
Is the problem resolved
after the MAIN Assy
is replaced?
No
Is the problem resolved
after the D-MAIN Assy
is replaced?
Is the problem resolved
after the TUNER Assy
is replaced?
No
No
Replace the FRONT Assy.
Ye s
Is the problem resolved
after the FRONT Assy
is replaced?
Is the voltage of ±12 V
power OK?
Is the clock of the MAIN UCOM
oscillating at a level higher
than 2.5 Vp-p?
Is any IC (incl. a regulator)
connected to ±12 V power
abnormally hot or burned out?
Is any IC (incl. a regulator)
on the D-MAIN Assy abnormally
hot or burned out?
Is the problem resolved
after the AMP IC
is replaced?
6 7 8
A
B
C
D
5
VSX-S300-K
6 7 8
E
F
23
1
[6] Others (FL, MCACC etc)
FL Display Error
NG
Ye s
Replace the POWER TRANS Assy.
Ye s
Dark
No display
Resistor
Jumper
Dimmer OFF
Replace the resistor to jumper.
No
FL
Replace the corresponding
connector.
Replace the corresponding
connector.
0 V
Repair arround Q709.
Replace the FL display.
Replace the FRONT Assy.
Dimmer?
Dark?
No display?
No
No
Is the problem resolved
after the FRONT Assy
is replaced?
OK
3 V
FLT #13 VDD pin
3V? 0V?
Is the problem
resolved after the FL display
is replaced?
Is the problem resolved
after the POWER TRANS Assy
is replaced?
R734,R735
on FRONT Assy:
Jumper? Resistor?
Ye s
Ye s
Is there breakage in the connector
that connects the FRONT and MAIN,
FRONT and POWER TRANS Assys?
(Check conduction between Surfaces
B of the boards.)
NG
Replace the IC122.
Replace the MAIN UCOM and
X’ tal circuit.
Replace the MAIN Assy.
No
No
No
Is the problem resolved
after the MAIN Assy
is replaced?
OK
Is the problem
resolved after repairing the IC122
and its periphery?
Is the problem resolved by
replacing the MAIN UCOM and its
peripheral circuit?
Ye s
Ye s
Ye s
Is there breakage in the connector
that connects the MAIN and POWER
TRANS Assys? (Check conduction
between Surfaces B of the boards.)
Product exchange
No
A
2 3 4
B
C
D
E
F
24
VSX-S300-K
1
2 3 4
LED Error
Ye s
Correct the LED attachment
position.
Ye s
Dimmer OFF
Replace the LED or LED-drive
transistor.
Replace the FRONT Assy.
No
No
OK
No
No
LED
Replace the corresponding
connector.
Dimmer?
Is the LED obliquely
attached?
Is there a 0-3 V PWM
signal at the LED-drive
transistor?
OK
Is the problem resolved
after the MAIN (or D-MAIN)
Assy is replaced?
Is the problem resolved
after replacing either the LED
or the LED-drive transistor?
Ye s
NG
Replace the UCOM.
NG
Replace the MAIN Assy
(or D-MAIN Assy).
Ye s
Ye s
Check the UCOM
IC110 pin 26 on MAIN Assy
(Power LED) and
IC1316 pin 26,30 on D-MAIN Assy
(MCACC/HDMI)
?
Product exchange
No
Is there breakage in the connector
that connects the POWER TRANS
and MAIN (Power LED),
FRONT and D-MAIN (MCACC/HDMI)
Assys? (Check conduction
between Surfaces B of the boards.)
5
6 7 8
A
B
C
D
E
F
VSX-S300-K
5
6 7 8
25
1
Multi-Channel ACoustic Calibration function (MCACC) not performed or results in abnormal values
Ye s
Replace the MIC Assy.
Replace the MIC Assy.
Replace IC702 (MIC/PORTA. switching IC).
Ye s
Retighten the screw. (Defective grounding)
Ye s
No (MCACC not started)
[Failure on the MIC Det path]
• Failure in connection between the MIC Assy
and MAIN Assy
• Peripheral circuit of the MIC jack
• Peripheral circuit of the MIC Det path (MIC Assy)
• Peripheral circuit of the MAIN UCOM (MAIN Assy)
[Failure on the MIC audio path]
• Defective connection on the path from the
MIC jack to the MAIN Assy (E-VOL)
• Defective connection of the MIC SEL signal
(MAIN UCOM)
Yes (But resulted in abnormal value)
No
No
No
No
No
Replace the Mic Amp IC.
Replace the D-MAIN Assy.
No
Can the MCACC function
be started when a microphone is
plugged in?
Is the problem
resolved after the MIC Assy
is replaced?
Is the problem
resolved after the MIC Assy
is replaced?
No
Is the problem
resolved after the MAIN Assy
is replaced?
Is the problem
resolved after the D-MAIN Assy
is replaced?
Is the problem resolved after
the screw on the rear panel
is retightened?
Is the problem resolved after
the second screw from the left
located at the lower part of the
front panel (lower right of the
MIC jack) is retightened?
Is there a signal at
Pin No. 1 of IC702?
Is a signal output from
Mic Amp Out?
Ye s
Ye s
Ye s
Ye s
Ye s
Product exchange
No
A
2 3 4
B
C
D
E
F
26
1
2 3 4
VSX-S300-K
5
How to Distinguish Causes of Failure Regarding HDMI Connection and HDMI Control
A source device that is connected via the HDMI input connector is not
recognized. (The HDMI LED is not lit.)
[Problem in use]
• Turn the source device ON.
Although some source devices output a hot-plug
(equipment connection detection) signal even
when in STANDBY mode, others don’ t and are
thus not recognized.
OFF or STANDBY
[Problem in use]
• Set the Output setting to HDMI.
On some devices, even if you do not set the HDMI
Output setting to OFF, if an output other than HDMI
is set to ON, the HDMI Output setting will be
automatically set to OFF.
No
No
Is the source device’s
power OFF?
Is the Output setting of
the source device set
to HDMI?
ON
Ye s
Ye s
[Failure in SCL/SDA of the corresponding input connector]
• Pins 15 and 16 of each input connector
• HDMI RECEIVER: IC1303
• Failure on the path from the input connector to the
HDMI receiver (D-MAIN Assy)
Although connection is recognized,
the connected equipment cannot
be identified.
Is the HDMI icon flashing
on the FL display?
No
Does the HDMI icon flash
when a signal is input through
any of other HDMI input
connectors?
This unit cannot be recognized by a TV that is connected via the HDMI
output connector of this unit.
Ye s
Connection to a particular
connector cannot be recognized.
[Failure in hot-plug signal detection or SCL/SDA of the
output connector]
•
Pins 15, 16, and 19 of the output connector
•
HDMI TRANSMITTER: IC1308
•
Failure on the path from the input connector to the
HDMI transmitter (D-MAIN Assy)
Distinguish if the problem is caused by
failure in hot-plug signal detection or
SCL/SDA, from the TV's indication of
connection recognition.
HDMI Control (** Link) does not function.
[Failure in Consumer Electronics Control]
• Failure in the CEC block (Q1320-1322, D1358)
• Failure in the SUB UCOM (IC1316 )
(D-MAIN Assy)
It is assumed that the HDMI Control
setting is set to ON.
[Failure in hot-plug signal detection of the corresponding
input connector]
•
Pin 19 of the corresponding input connector
•
HDMI RECEIVER: IC1303
• Failure on the path from the input connector to the
HDMI receiver (D-MAIN Assy)
Connection to all connectors
cannot be recognized.
[Failure in the section common to all HDMI inputs]
• HDMI RECEIVER: IC1303
• Failure in the whole D-MAIN Assy
6 7 8
A
B
C
D
E
F
VSX-S300-K
5
6 7 8
27
1
MAIN POWER
PVDD(36V/7A)
BT/USB_+5.6V(1A)
SUB POWER
RLY/ADC/AMP +12V(0.2A)
AUDIO_-12V(0.1A)
-12V REGULATOR
+12V_VIDEO/+12V(0.2A)
DSP_+5V(0.5A)
VFD
FL_+42V
FL_ +/- AC3.8V
POWER
MAIN_MICOM_+3.3V(0.1A)
HDMI_+3.3V(1.5A)
DSP_+3.3V(1A)
CPU_+5V(0.1A)
MAIN_CONTROL_1
MAIN_CONTROL_2
MAIN_CONTROL_3
HDMI_+5V(0.5A)
FET_SWITCH
FET_SWITCH
FET_SWITCH
TR_SWITCH
FET_SWITCH
+12V REGULATOR
+3.3V REGULATOR
FET_SWITCH
SW FET
IC821
Detect temperature of pattern of
side A arround the Q821.
TH841
TH842
1
REF VCC
CHOPPER
(+3.3V)
POWER SENSE
AC-LINE
PHOTO COUPLER
+5.6V
+15V
FET_SWITCH
MAIN_CONTROL_4
1 2
1 2
1 2
T821
1
2
3
4
5
7
6
10
9
T871
1
2
3
7
6
14
8
11
9
12
13
10
D811
FU811
250V/6.3A
++
++
SW IC
-> Oscillation stop
2
Q821
HSQ821
L
POWER TRANS ASSY
J model only
ACTIVE
Signal name in
the circuit diagram
Item to be controlled
(input destination)
Detection specifications
(temperature, level, time, etc.)
— — VCC terminal of IC821 Detection of 95°C at TH841
L DC PROTECT IC110 pin 88 Detection of DC for 3 sec or more will be treated as an error.
— —
— LIMIT+
LIMIT-
VEF terminal of IC821 Detection of 95°C at TH842
L BT_/OC IC110 pin 66 Detection of 780 mA
L SD IC110 pin 83 Detection of 155°C
L OTW2 IC110 pin 85 Detection of 125°C at intervals of 2 min
L
L UBI_BD2226 _/OC IC1316 pin 4 Detection of 1 A
DC1_PROTECTION IC110 pin 39 PVDD power voltage: +38 V or higher, or 14.7 V or lower
D140 - D151
Difference in the absolute values of electrical potentials between the
positive and negative electrodes of ±12 V: 0.6 V or higher
PVDD current: 4.2 A
No.
1
7
2
4
8
5
6
3
9
Function
Q821 PCB temperature detection
DC detection
Q821 PCB temperature detection
PVDD excess current detection
BT excess current detection
AMP shutdown
AMP temperature detection
Wi-fi USB excess current detection
PVDD voltage error detection
±12V voltage drop detection
5.2 PROTECT CIRCUIT
A
B
C
2 3 4
D
E
F
28
1
2 3 4
VSX-S300-K
±12 V voltage drop
detection circuit
PVDD voltage drop
detection circuit
PVDD Over voltage
detection circuit
AF signal voltage limit
DifferentialBuffer IN
BT over current
detect
AMP output over current,
AMP IC temperature detect
PVDD, ±12 V voltage
abnormal detect
MAIN UCOM
PVDD Over current
detection circuit
3
E-VOL OUT
D-AMP IC
PV D D
SR/C/SW
FL/FR/S
+3 .3V
Wi-fi USB over current detect
DC detect
MAIN UCOM
-12V
AC detect
SUB UCOM
Current
Limiter IC
Current
Limiter IC
+3.3V
+12V -12V
POWER DOWN
CONTROL1
UBI_BD2226 _/OC
UBI_BD2226 _/EN
SD
OTW2
DC PROTECT
DC PROTECT
DC1_PROTECTION
BT_/OC
BT_ON/CE
SD
OTW2
8
9
R705
47K
R707
47K
R709
47K
R712
47K
R743
100K
R732
100K
C827
1N-J
D609
KDS4148U
R733
100K
R723
100K
R749
10K
D611
KDS4148U
R735
100K
R724
100K
R750
10K
C826
100N-K
D608
KDS4148U
Q609
2SC3052
R704
47K
D610
KDS4148U
R711
47K
R706
47K
R715
47K
R708
47K
R710
47K
R714
47K
R713
47K
R742
100K
R730
47K
Q606
ISA1530AC1
C794
1N-J
C828
1N-J
R731
47K
Q607
ISA1530AC1
R734
0
R736
0
C798
220/25(8*11.5)
C795
1N-J
C800
220/25(8*11.5)
Q608
Q604
ISA1530AC1
C799
220/25(8*11.5)
Q610
2SC3052
C801
220/25(8*11.5)
Q605
ISA1530AC1
546
7
R185
1K5
R153
2K2
R154
33K
R156
220
D104
1SS133T
C13210N-K-100V
R179
3K6
R180
22K
R181
430
R186
330
R727
10K
R155
4K7
Q122
RT1N141C
C143
10N-K-100V
R182
910
R184
-
Q120
ISA1530AC1
Q119
ISA1530AC1
R172
560K
Q114
2SC3052
R183
560K
+3.3V
R726
4K7
Q121
RT1P141C
R728
C140
4.7/50
Q118
ISA1530AC1
Q113
ISA1530AC1
R164
2K2
D
MAIN ASSY
H
D-AMP ASSY
M
BT ASSY
F
D-MAIN ASSY
A
TUNER ASSY
Operation of the unit after detection Recovery method Remarks
Indication on
the FL display
Microcomputer
error log
No particular
indication
No particular
indication
No particular
indication
No particular
indication
DC
PVDD
PVDD
Forced power-on
Forced power-on
If DC is detected even for an instant, the protection relay
(speaker relay) will be immediately turned off. Monitoring
of DC continues, and if DC is successively detected for
3 sec or more, the unit will shut itself off. If DC is detected
for less than 3 sec, the protection relay will go back ON
again and the unit will return to Play mode.
If DC is detected for less than 3 sec, the unit
can be used continuously.
With DC detection 3 sec or longer, the unit
cannot be restarted after shutdown.
The unit can be recovered by forced power-on.
—
—
The unit will stop supplying +5-V power for the BT Adaptor.
"ADP ERR" POWER OFF/ON—
"OVER HEAT" SD Set the POWER button to ON after letting
the unit sit for cool-down.
After detection, the unit will immediately shut itself off.
"OVER TEMP" TEMP Use the unit at lower volume.The volume will be decreased by 3 dB if the same high
temperature is detected again 2 min after the first
detection. In the same way, at each detection of the
high temperature, which is performed at intervals of 2 min,
the volume will be decreased by 3 dB.
After the volume falls down to -20 dB, that level will be
maintained.
PVDD Forced power-on —
—
The unit will stop supplying +5-V power for the Wi-fi Dongle.
— POWER OFF/ON—
—
—
No particular
indication
— — —
Check the error history. If the error
codes are “TEMP 000,SD 001,” the
unit will shut itself off because of
excess current detection. Check the
connection at the speaker terminals
for short-circuiting.
POWER OFF
To limit the level of the signal to be input to the AMP IC,
power of the operational amp on the differential buffer
circuit is controlled.
As a result of oscillation stop of PVDD power, the PVDD
voltage is decreased, DC1_PROTECTION is activated,
then the unit shuts itself off.
5
6 7 8
A
B
C
5
6 7 8
VSX-S300-K
D
E
F
29
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