Read the following information before using the service manual.
What you can do with this manual
Search for a Ref. No. (phrase)
(Ctrl+Shift+F)
You can use the search function in Acrobat Reader to
search for a Ref. No. in schematic diagrams, printed
wiring circuit diagrams, block diagrams, and parts
lists.
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 set is defective.
Be sure to test for leakage current with the AC plug in both polarities, in addition, when the set's power is in each state
(on,offandstandbymode),ifapplicable.
CAUTION
Please heed the following cautions and instructions during servicing and
inspection.
◎Heed the cautions!
Cautions which are delicate in particular for servicing
are labeled on the cabinets, the parts and the chassis,
etc. Be sure to heed these cautions and the cautions
described in the handling instructions.
Check that all screws, parts and wires removed or
disconnected when servicing have been put back in their
original positions, check that no serviced parts have
deteriorate the area around. Then make an insulation
check on the external metal connectors and between
the blades of the power plug, and otherwise check that
safetyisensured.
(Insulationcheckprocedure)
Unplug the power cord from the power outlet, disconnect
the antenna, plugs, etc., and on the power. Using a 500V
insulation resistance tester, check that the insulation
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
set is defective.
Power supply :(for E3) : AC 120 V, 60 Hz(for E1C) : AC 220 V, 50 Hz
Power consumption :310W
Power consumption in standby mode: 0.1 W
Power consumption in CEC standby mode: 0.5W
Power consumption when Bluetooth standby is used: 1W
(Enhanced Data Rate)
AVRCP (Audio Video Remote Control Prole)1.4
DIMENSION
Unit : in. (mm) Weight : 16 lbs 9 oz (7.5 kg)
17 3/32 (434)
(12)
15/32
12 9/16 (319)
11 11/32 (288)
3/4
(19)
(47)
1 27/32
7 3/4 (197)
(44)
1 47/64
5 23/64 (136)
5 15/16 (151)
2 23/64
(60)
1 49/64 (45)1 49/64 (45)
13 35/64 (344)
(15)
19/32
9
TECHNICAL SPECIFICATIONS FOR AVR-X510BT
nAudio Section
• Power amplifier
Rated output :
Front :
70 W + 70 W (8 Ω/ohms, 20 Hz – 20 kHz with 0.08 % T.H.D.)
90 W + 90 W (6 Ω/ohms, 1 kHz with 0.7 % T.H.D.)
Center :
70 W (8 Ω/ohms, 20 Hz – 20 kHz with 0.08 % T.H.D.)
90 W (6 Ω/ohms, 1 kHz with 0.7 % T.H.D.)
Surround :
70 W + 70 W (8 Ω/ohms, 20 Hz – 20 kHz with 0.08 % T.H.D.)
90 W + 90 W (6 Ω/ohms, 1 kHz with 0.7 % T.H.D.)
Output connectors : 6 – 16 Ω/ohms
• Analog
Input sensitivity/Input impedance : 200 mV/47 kΩ
Frequency response: 10 Hz – 100 kHz — +1, –3 dB (Direct mode)
S/N : 98 dB (IHF–A weighted, Direct mode)
nTuner section
[FM](Note: μV at 75 Ω, 0 dBf = 1 x 10
Reception frequency range (for E1 / E1C) :
[FM] 87.5 MHz – 108.0 MHz [AM]522 kHz – 1611 kHz
Effective sensitivity :
[FM]1.2 μV (12.8 dBf) [AM]18 μV
50 dB sensitivity :
[FM]MONO 2.8 μV (20.2 dBf)
S/N ratio:
[FM]MONO 70 dB (IHF–A weighted, Direct mode)
STEREO 67 dB (IHF–A weighted, Direct mode)
Distortion (at 1 kHz) :
[FM]MONO 0.7 %
STEREO 1.0 %
–15
W)
nBluetooth Section
Communications system : Bluetooth Version 2.1 + EDR
Transmission power : Maximum 2.5 mW (Class 2)
Maximum communication range : Approx. 10m 2 in line of sight
Frequency band : 2.4 GHz band
Modulation scheme : FHSS (Frequency-Hopping Spread Spectrum)
Supported proles : A2DP (Advanced Audio Distribution Prole)1.2
Power supply :(for E1) : AC 230 V, 50 Hz / 60Hz (for E1C) : AC 220 V, 50 Hz
Power consumption :310W
Power consumption in standby mode: 0.1 W
Power consumption in CEC standby mode: 0.5W
Power consumption when Bluetooth standby is used: 1W
(Enhanced Data Rate)
AVRCP (Audio Video Remote Control Prole)1.4
DIMENSION
Unit : in. (mm) Weight : 16 lbs 9 oz (7.5 kg)
17 3/32 (434)
(12)
15/32
12 9/16 (319)
11 11/32 (288)
3/4
(19)
(47)
1 27/32
7 3/4 (197)
(44)
1 47/64
5 23/64 (136)
2 23/64
(60)
1 49/64 (45)1 49/64 (45)
13 35/64 (344)
(15)
19/32
10
5 15/16 (151)
PRECAUTIONS DURING SERVICE
Initializing This Unit
Initialize this unit if you have replaced the microcomputer, one of the parts around the microcomputer, or the digital PCB.
1. Press the power button (X) to turn off the power.
2. AVR-S500BT: Hold down buttons "SOUND MODE 1" and "PRESET +" at the same time and press the power button
to turn on the power.
AVR-X510BT: Hold down buttons "PRESET +" and "TUNE +" at the same time and press the power button to turn on
• Remove each part in the order of the arrows below.
• Reassemble removed parts in the reverse order.
• Read“ SAFETY PRECAUTION” before reassembling removed parts.
• If wire bundles are removed or moved during adjustment or part replacement, reshape the wires after completing the
work. Failure to shape the wires correctly may cause problems such as noise.
TOP CABINET
FRONT PANEL ASSY
See "DISASSEMBLY
1. FRONT PANEL ASSY"
and "EXPLODED VIEW"
FRONT PCB
(Ref. No. of EXPLODED VIEW : P1)
STANDBY PCB
(Ref. No. of EXPLODED VIEW : P2)
PHONE PCB
(Ref. No. of EXPLODED VIEW : P3)
USB & MIC PCB
(Ref. No. of EXPLODED VIEW : P4)
MODULE BLUETOOTH
(Ref. No. of EXPLODED VIEW : P5)
DIGITAL PCB
See "DISASSEMBLY
2. DIGITAL PCB ASSY"
and "EXPLODED VIEW"
VIDEO PCB
(Ref. No. of EXPLODED VIEW : P10)
DIGITAL PCB
(Ref. No. of EXPLODED VIEW : P8)
TUNER PCB
(Ref. No. of EXPLODED VIEW : P9)
RADIATOR ASSY
See "DISASSEMBLY
3. RADIATOR ASSY"
and "EXPLODED VIEW"
MAIN PCB
(Ref. No. of EXPLODED VIEW : P6)
SMPS PCB
See "DISASSEMBLY
4. SMPS PCB
and "EXPLODED VIEW"
SMPS PCB
(Ref. No. of EXPLODED VIEW : P12)
REGULATOR PCB
See "DISASSEMBLY
5. REGULATOR PCB"
and "EXPLODED VIEW"
REGULATOR PCB
(Ref. No. of EXPLODED VIEW : P11)
TRANS POWER
See "DISASSEMBLY
6. TRANS POWER"
and "EXPLODED VIEW"
TRANS POWER
(Ref. No. of EXPLODED VIEW : P15 )
12
Explanatory Photos for“ DISASSEMBLY”
• The angles from which the photos are taken are shown by“ Photo angle: A, B, C, D“ .
• See the diagram below about the shooting direction of each photograph.
• Photographs with no shooting direction indicated were taken from the top of the set.
• The photograph is AVR-S500BT E3 model.
The viewpoint of each photograph
(Shooting direction)
Shooting direction: B
Front side
Shooting direction: C
Shooting direction: A
Note: • Before disassembling this unit, be sure to discharge the power line (the colored line in the
schematic diagram).
• FFC cables with one end disconnected should be insulated by using tapes, etc.
Shooting direction: D
13
1. FRONT PANEL ASSY
Proceeding : CABINET TOP
(1) Remove the screws.
View from the bottom
(2) Remove the screws and disconnect the FFC.
FRONT PANEL ASSY
→
FRONT PANEL ASSY
CN713
CN752
(3) Disconnect the connector wires.
FFC
CN102
CN104
See "EXPLODED VIEW" for the disassembly method of each PCB included in FRONT PANEL ASSY.
14
2. DIGITAL PCB
Proceeding : CABINET TOP
(1) Remove the screws.
Shooting direction: A
(2) Remove the screws.
Disconnect the connector wires and FFC.
DIGITAL PCB
→
CN751
CN712
CN713
CN752
CN772
FFC
VIDEO/OPT PCB
FFC
DIGITAL PCB
CN771
15
3. RADIATOR ASSY
CN503
Proceeding : TOP COVER
(1) Remove the screws.
Shooting direction: A
(2) Remove the screws then disconnect the connector wire.
Remove the RADIATOR ASSY from the CHASSIS BOTTOM.
MAIN PCB
DIGITAL PCB
→
→
RADIATOR ASSY
16
4. SMPS PCB
Proceeding : CABINET TOP
See "EXPLODED VIEW" for the disassembly method of SMPS PCB.
→
SMPS PCB
5. REGULATOR PCB
Proceeding : CABINET TOP
See "EXPLODED VIEW" for the disassembly method of REGULATOR PCB.
REGULATOR PCB
→
6. TRANS POWER
Proceeding : CABINET TOP
See "EXPLODED VIEW" for the disassembly method of TRANS POWER.
TRANS POWER
→
17
SPECIAL MODE
Special mode setting button
No. 1, 2 : Hold down buttons A and B at the same time and press the power button (
b
No. 3, 4 : Hold down buttons A, B and C for at least 3 seconds while the power is on.
AVR-S500BT
ModeButton AButton BButton CContents
1InitializationSOUND MODE
1
PRESET +
2Version DisplayPRESET +TUNE -
Chang Video Format
3
and Display Languge
4Product ModeSOUND MODE
PRESET
-
PRESET +TUNE -
PRESET
1
PRESET
-
Backup data initialization is carried out.
(See 11 page.)
Firmware versions such as Main, DSP or OSD
are displayed in the FL display. Errors are
displayed or when they occur.
(See 20 page.)
Update", "Protection History Display" and "Mic
Mode".
)
to turn on the power.
X
X
SOURCE SELECT
SOUND MODE 1
SOUND MODE
PRESET -, +
TUNER
PRESET CH
CBL/SAT
1
BASS /
ON / OFF
TREBLE
TONE CONTROL
TUNE-
DVD/Blu-ray
2
ADJUST
QUICK SELECT
TUNE
GAME
3
4
MASTER VOLUME
BANDMODE DIMMER STATUS
Bluetooth
SETUP MICPHONES
5V/1A
18
No. 1, 2 : Hold down buttons A and B at the same time and press the power button (
b
No. 3, 4 : Hold down buttons A, B and C for at least 3 seconds while the power is on.
AVR-X510BT
ModeButton AButton BButton CContents
1InitializationPRESET +TUNE +
2Version DisplayTUNE +DIMMER
Chang Video Format
3
and Display Languge
TUNE -TUNE +DIMMER
4Product ModePRESET +TUNE -TUNE +
Backup data initialization is carried out.
(See 11 page.)
Firmware versions such as Main, DSP or OSD
are displayed in the FL display. Errors are
displayed or when they occur.
(See 20 page.)
Select the mode shown below.
"Remote Lock", "Tuning Step Change", "OSD
Update", "Protection History Display" and "Mic
Mode".
)
to turn on the power.
X
X
SOURCE SELECT
PRESET +
TUNER
PRESET CH
TUNE -, +
TUNE
DIMMER
DIMMER STATUS
MASTER VOLUME
Bluetooth
GAMECBL/SAT
DVD/Blu-ray
31
2
4
QUICK SELECT
SETUP MICPHONES
5V/1A
19
1. Initialization Mode
1.1. Operations
Hold down buttons below at the same time and press the power button to turn on the power.
"SOUND MODE 1", "PRESET +" (AVR-S500BT)
"PRESET +", "TUNE +" (AVR-X510BT)
Release the buttons after conrming that the display ashes in intervals of approximately 1 second.
1.2. Actions
Initialize this unit.
Note:Settings for the tuner step are not initialized.
2. Version Display Mode
2.1. Operations
Hold down buttons below at the same time and press the power button to turn on the power.
"PRESET +", "TUNE -" (AVR-S500BT)
"TUNE +", "DIMMER" (AVR-X510BT)
Press the button "STATUS" to display the versions.
2.2. Actions
Press the "STATUS" button to display the versions in the following order.
Error information(See 2.4. Error display) →q Model destination information → w Main-µcom version → e Main IAP →
DSP version →
r
When an error has occurred in this unit, the error information is displayed initially when entering this mode. (5 seconds)
OSD version
t
→
USB version
y
→ Nomal display
DisplayState
Model destination information
q
AVR-S500BT
AVR-X510BT E1 model
AVR-X510BT E1C model
AVR-S500BT E1C model
Main-µcom version
w
Main IAP
e
DSP version
r
OSD version
t
USB version
y
E3 model
A V R - S 5 0 0E 3
A V R - X 5 1 0E 1
A V R - X 5 1 0E 1 C
A V R - S 5 0 0E 1 C
M a i n . * * * * - V * . * *
M a i nI A PV * * . * *
D S P . * . * . *
O S D: * * . * *
U S B . * * . * * . * *
2.3. Canceling the mode:
Press the X button to turn the power off.
2.4. Error display
See the following table for each "Error information" display and its contents (status).
Condition-State
DSP NGWhen DSP boot, executing DSP reset makes to becomes error.
DSP OK(No error display, version display only)
20
D S PE R R O R0 1
3. Change Video Format and Display Language Mode
3.1. Operations
Hold down buttons below for at least 3 seconds while the power is on.
"PRESET -", "PRESET +", "TUNE -" (AVR-S500BT)
"TUNE -", "TUNE +", "DIMMER" (AVR-X510BT)
Note: Do not start in this mode when displaying the OSD MENU using the MENU button.
3.2. Actions
This unit is in VIDEO Format at startup.
Press the button below to switch between Video Format and Display Language.
"TUNE +" AVR-S500BT
"STATUS" AVR-X510BT
3.2.1. Video Format
Press the button below to switch between NTSC and PAL.
"PRESET +" or "TUNE -" AVR-S500BT
"PRESET +" or "DIMMER" AVR-X510BT
FLD
V .F o r m a t : < N T S C >
↓↑
FLD
V . F o r m a t : < P A L>
↓↑
Return to top.
Press the "Preset -" button to set format. The display then return to the normal mode.
3.2.1.Language
Press the button below to switch display language.
"PRESET +" or "TUNE -" AVR-S500BT
"PRESET +" or "DIMMER" AVR-X510BT
FLD
L a n g . : < E N G L I S H >
↓↑
FLD
L a n g . : < S P A N I S H >
↓↑
FLD
L a n g . : < F R E N C H>
↓↑
FLD
L a n g . : < C H I N E S E >
↓↑
Return to top.
Press the "Preset -" button to set display language. The display then return to the normal mode.
21
4. Product Mode
Select "Remote Lock", "Tuner Step", "OSD update", "Protection History Display" or "Mic Mode" .
4.1. Operations
Hold down buttons below for at least 3 seconds while the power is on.
"SOUND MODE1", "PRESET -", "PRESET +" (AVR-S500BT)
"PRESET +", "TUNE -", "TUNE +" (AVR-X510BT)
Each mode shown on the display changes each time the button below is pressed.
"TUNE +" (AVR-S500BT)
"STATUS" (AVR-X510BT)
Press the buttons below to switch the display "On"/"Off".
"PRESET +", "TUNE -" (AVR-S500BT)
"PRESET +", "DIMMER" (AVR-X510BT)
Press the button below to set the displayed "On"/"Off".
"PRESET -" (AVR-S500BT)
"TUNE -" (AVR-X510BT)
4.2. Displaying and Selecting Each Mode
Remote Lock Mode
FLD
R E M O T EL O C K : O f f
Press the "TUNE +"(AVR-S500BT) button.
Press the "STATUS"(AVR-X510BT) button.
Tuner Step Change Mode
FLD
T U N E R : A M 9 / F M 5 0
OSD Update Mode
FLD
O S DU p d a t e : O f f
Protection History Display Mode
FLD
N OP R O T E C T
Mic Mode
FLD
M I C M o d e
Return to top.
4.3. Canceling Each Mode
See the actions of each mode.
Press the "TUNE +"(AVR-S500BT) button.
Press the "STATUS"(AVR-X510BT) button.
Press the "TUNE +"(AVR-S500BT) button.
Press the "STATUS"(AVR-X510BT) button.
Press the "TUNE +"(AVR-S500BT) button.
Press the "STATUS"(AVR-X510BT) button.
Press the "TUNE +"(AVR-S500BT) button.
Press the "STATUS"(AVR-X510BT) button.
22
4.4.1. Remote Lock Mode
To enter the Product Mode, to display the Remote Lock Mode.
Press the button below to switch between On and Off.
"PRESET +" / "TUNE -" (AVR-S500BT)
"PRESET +" / "DIMMER" (AVR-X510BT)
FLD
R E M O T EL O C K : O f f
↓↑
FLD
R E M O T EL O C K : O n
Press the button below to set On/Off. The display then return to the normal mode.
"PRESET -" (AVR-S500BT)
"TUNE -" (AVR-X510BT)
4.4.2. Tuner Step Change Mode
To enter the Product Mode, to display the Tuner Step Change mode.
Press the button below to switch between AM9/FM50 and AM10/FM200.
"PRESET +" / "TUNE -" (AVR-S500BT)
"PRESET +" / "DIMMER" (AVR-X510BT)
FLD
R E M O T EL O C K : O f f
↓↑
FLD
R E M O T EL O C K : O n
Press the button below to set On/Off. The display then return to the normal mode.
"PRESET -" (AVR-S500BT)
"TUNE -" (AVR-X510BT)
To operate this unit in the set step, either remove the power plug from the power outlet or press the power button to turn off
the power, and then turn the power on again.
*The initialization will not initialize the tuner step frequency.
4.4.3. OSD Update Mode
Not for service. Do not operate.
Cancellation of the mode
Disconnect the AC plug of this unit to turn the power off.
23
4.4.4. Protection History Display Mode
To enter the Product Mode, to display the Protection History Display Mode.
(1) If no protections have occurred.
FLD
N OP R O T E C T
(2) For THERMAL (when the last protection incident was THERMAL(A) or THERMAL(B) protection)
FLD
P R T : T H E R M A LA
FLD
P R T : T H E R M A LB
Cause: The temperature of the heat sink is excessive.
If the power is turned on without correcting the abnormality, the protection function will work about 4 minutes later
and the power supply will be shut off.
(3) For ASO (when the last protection incident was ASO protection)
FLD
P R T : A S O
Cause: The line between speaker terminals is shorted, or speakers with impedance of less than the rated value.
Supplementary information: As the excess current is detected after operation of the speaker relay, a short on the
speaker terminal and the connected speaker can be identied.
(4) For DC (when the last protection incident was DC protection)
FLD
P R T : D C
Cause: DC output of the power amplier is abnormal.
If the power is turned on without correcting the abnormality, the protection function will work about 6 seconds later
and the power supply will be shut off.
(5) For Power(when the last protection incident was Power protection)
FLD
P R T : P o w e r
Cause: The Power Supply(±12V) is abnormal.
Additional causes of protection can be due to loose connections, associated components, Microprocessor, etc.
b
Press the button below to set On/Off. The display then return to the normal mode.
"PRESET -" (AVR-S500BT)
"TUNE -" (AVR-X510BT)
Clearing the protection history
There are two ways to clear the protection history, as described below.
(1) Start up the set in error (protection display) mode and display the error, then press and hold down the below button for
3 seconds.
FLD
P R T : D C
Press the button for 3 seconds.
FLD
P R T : C L E A R
FLD
N OP R O T E C T
(2) Initialize. ( 20 page.)
The above is displayed and the protection history is cleared.
24
4.4.5. Mic Mode
Not for service. Do not operate.
Cancellation of the mode
Press the power button to turn off the power or disconnect the AC plug of this unit to turn the power off.
25
PROCEDURE AFTER REPLACING THE MICROPROCESSOR, ETC
The procedure after replacing the u-COM (Microprocessor), ash ROM, etc. is as follows.
PCB Name Ref. No.Description
DigitalIC711 STM32F101ZGBSOFTWARE: Main
Digital
Digital
IC722 MX25L3206EM2I-12GBSOFTWARE: GUI ROM
IC742 MX25L8006EM2I-12GBSOFTWARE: DSP ROM
After replacing
A : The software has been written. The software is not written at the time of replacement.
B : The software has been written. The software may need to be rewritten by version updates. Check the version.
C : The software has not been written. The software needs to be written after replacement. See “Firmware Update
Procedure” for information on writing the software.
D : The software has been written. Be sure to rewrite with the latest software for your service region. See “Firmware Update
Procedure” for information on writing the software.
Firmware Update Procedure
1. Updating by USB
The latest rmware can be downloaded to a USB Memory for updates.
1.1. Connecting to the USB Memory
(1) Prepared
• USB format: Prepare a USB memory formatted in FAT16 or FAT32.
• Do not run the USB memory through a hub.
• Do not connect a computer to the USB port of this unit using a USB cable.
• Do not use an extension cable when connecting the USB memory.
After
replaced
Remark
1.2. Unzip Download File
Unzip the downloaded le on your computer.
You can nd "S500BT_USB_V**_**.fw" fole after unzipped. Copy that le to USB ash drive.
You have to put "S500BT_USB_V**_**.fw" le on root directly on USB ash drive(memory).
1.3. Insert the USB memory device in the USB port
Download the
firmware to a USB
memory.
CBL/SAT
S
2
DVD/Blu-ray
QUICK SELECT
5V/1A
Bluetooth
GAME
31
4
SETUP MIC
MASTER VOLUME
26
1.5. Start the update
TV AUDIO
QUICK SELECT
POWER
MODE
AM
MEMORY
CHANNEL
TUNE
FMCBL/SAT
Blu-ray
GAME
Bluetooth
USB
ECO
2134
Turn on the power of this unit. Then, push "SETUP" and select.
RESTORER
CH LEVEL
SLEEP
SEARCH
PUSH "SETUP"
(1) Select "General"
FLD
G e n e r a l
INFOOPTION
ENTER
BACK
SETUP
VOLUME
MUTE
(2) Select "Firmware"
FLD
F i r m w a r e
27
(3) Push "ENTER"
FLD
F i r m w a r e: S t a r t
(4) Select "Yes", then, Push "ENTER"
FLD
F i r m w a r e: • Y e s –
FLD
U p d a t eT i m e * * : * *
--- Precautions for Updates ---
• Never remove the USB memory before the update is nished.
• Never turn off the power before an update is completed.
• It takes around about 35 minutes to complete the update even with a broadband connection.
Once an update is started, normal operations cannot be performed until it is completed.
The GUI menu settings and image adjustment settings of this unit may be initialized.
Take note of your settings beforehand and recongure them after the update.
28
1.6. About the error code
No FirmwareFile in USB.
FirmwareFile in USB for unsupported Model name/area
29
ADJUSTMENT
Audio Section
Adjusting Idling Current
Required measurement equipment: DC Voltmeter
1. Preparation
(1) Avoid direct blow from an air conditioner or an electric fan and humidity should be moderate, and place the set at
normal usage environment.
Temperature should be at 15 °C ~ 30 °C (59 °F ~ 86 °F).
(2) Presetting
• POWER (Power source switch) OFF
• SPEAKER (Speaker terminal) No load
(Do not connect speaker, dummy resistor, etc.)
2. Adjustment
(1) Remove the top cover and set VR510(FL), VR550(FR), VR530(C), VR520(SL), VR540(SR), on MAIN PCB at fully
counterclockwise (c) position.
(2) Connect DC Voltmeter to test points (FRONT-Lch: CN510, FRONT-Rch: CN550, CENTER ch: CN530, SURROUND-
Lch: CN520, SURROUND-Rch: CN540).
(3) Connect the power cord to AC Line, and set the power switch to "ON".
(4) Presetting.
MASTER VOLUME : c minimum
SPEAKER (Speaker terminal) : No load
(Do not connect speaker, dummy resistor, etc.)
MODE : MCH STEREO
FUNCTION : CBL/SAT
(5) Within 2 minutes after the power on, turn VR510 clockwise (x) to adjust the TEST POINT voltage at
1.5mV ± 0.5mV DC.
(6) After 10 minutes from the preset above, turn VR510 to set the voltage to 2.0mV ± 0.5mV DC.
(7) Adjust the Variable Resistors of each channel(VR520-VR550) in the same way.