• HCD-GTR6/GTR7/GTR8
are the tuner, CD and
amplifi er section in
MHC-GTR6/GTR7/GTR8
• HCD-GTR6B/GTR8B
are the tuner, deck, CD and
amplifi er section in
MHC-GTR6/GTR7/GTR8
CD
Section
Tape Deck Section
only for HCD-GTR6B/GTR8B
Photo : HCD-GTR8B (E Model)
Model Name Using Similar MechanismNEW
CD Mechanism TypeCDM74HF-DVBU101//M
Optical Pick-up NameKHM-313CAB/C2NP
Model Name Using Similar MechanismHCD-GTX777/GTX787/GTX888
Tape Mechanism TypeCFP42608
E Model
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
Australian Model
HCD-GTR6B/GTR8B
AUDIO POWER SPECIFICATION
Amplifi er section
MHC-GTR8 (HCD-GTR8/HCD-GTR8B)
The following are measured at
Mexican model: AC 127 V, 60 Hz
Other models: AC 120, 220, 240 V, 50/60 Hz
Front/Surround speaker
Power Output (rated): 210 W + 210 W (at 6 Ω, 1 kHz, 1% THD,
at LINK MODE)
Front speaker
RMS output power (reference):
280 W + 280 W (per channel at 8 Ω,
1 kHz, 10% THD)
Surround speaker
RMS output power (reference):
110 W + 110 W (per channel at 24 Ω,
1 kHz, 10% THD)
Subwoofer
RMS output power (reference):
160 W + 160 W (per channel at 6 Ω,
100 Hz, 10% THD)
SPECIFICATIONS
MHC-GTR7 (HCD-GTR7)
The following are measured at
Mexican model: AC 127 V, 60 Hz
Other models: AC 120, 220, 240 V, 50/60 Hz
Front/Surround speaker
Power Output (rated): 215 W + 215 W (at 6 Ω, 1 kHz, 1% THD, at LINK MODE)
Front speaker
RMS output power (reference):
285 W + 285 W (per channel at 8 Ω, 1 kHz, 10% THD)
Surround speaker
RMS output power (reference): 110 W + 110 W (per channel at 24 Ω,
1 kHz, 10% THD)
Subwoofer
RMS output power (reference): 210 W (at 8 Ω, 100 Hz, 10% THD)
The following are measured at
AC 120, 220, 240 V, 50/60 Hz
Front/Surround speaker
Power Output (rated): 200 W + 200 W (at 4 Ω, 1 kHz, 1% THD, at LINK MODE)
Front speaker
RMS output power (reference):
225 W + 225 W (per channel at 8 Ω, 1 kHz, 10% THD)
Surround speaker
RMS output power (reference):
225 W + 225 W (per channel at 8 Ω, 1 kHz, 10% THD)
Inputs
VIDEO (AUDIO IN) L/R:
Voltage 250 mV, impedance 47 kilohms
PC IN L/R: Voltage 700 mV, impedance 47 kilohms
MIC: Sensitivity 1 mV, impedance 10 kilohms
(USB) port: Type A
Outputs
PHONES: Accepts headphones of 8 Ω or more
Disc player section
System Compact disc and digital audio system
Laser Diode Properties Emission Duration: Continuous
Laser Output*: Less than 44.6 µW
* This output is the value measurement
at a distance of 200 mm from the
objective lens surface on the Optical
Pick-up Block with 7 mm aperture.
Frequency response 20 Hz – 20 kHz
Signal-to-noise ratio More than 90 dB
Dynamic range More than 88 dB
Tape deck section
(Except for Latin American and Mexican models)
Recording system 4-track 2-channel stereo
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
North American models:
87.5 – 108.0 MHz (100 kHz step)
Other models: 87.5 – 108.0 MHz (50 kHz step)
Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range Pan-American and Oceanian models:
530 – 1,710 kHz (with the interval set at 10 kHz)
531 – 1,710 kHz (with the interval set at 9 kHz)
Other models: 530 – 1,610 kHz (with the interval set at 10 kHz)
531 – 1,602 kHz (with the interval set at 9 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
USB section
Supported bit rate MP3 (MPEG 1 Audio Layer 3): 32 – 320 kbps, VBR
WMA: 48 – 192 kbps AAC: 48 – 320 kbps
Sampling frequencies MP3 (MPEG 1 Audio Layer 3): 32/44.1/48 kHz
WMA: 44.1 kHz
AAC: 44.1 kHz
Transfer speed Full-Speed
Supported USB device Mass Storage Class
Maximum current 500 mA
General
Power requirements
Mexican model: 127 V AC, 60 Hz
Australian model: 230 – 240 V AC, 50/60 Hz
Argentina model: 220 V AC, 50/60 Hz
Other models: 120 V, 220 V or 230 – 240 V AC, 50/60 Hz,
adjustable with voltage selector
Power consumption MHC-GTR8: 460 W
MHC-GTR7: 440 W
MHC-GTR6: 300 W
Mass (Approx.) HCD-GTR8B: 16.5 kg
HCD-GTR8/HCD-GTR7: 15.8 kg
HCD-GTR6B: 14.5 kg
HCD-GTR6: 13.8 kg
Design and specifi cations are subject to change without notice.
• Standby power consumption: 0.5 W
• Halogenated fl ame retardants are not
used in the certain printed wiring boards.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
2
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
Notes on Chip Component Replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270°C during
repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering or
unsoldering.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to fl ow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may also
be added to ordinary solder.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc refl ective surface by the objective lens in the optical pick-up
block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.
This appliance is
claassifi ed as a CLASS 1
LASER product. This
label is located on the
rear exterior.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specifi ed herein may result in hazardous
radiation exposure.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The fl exible board is easily damaged and should be handled with
care.
3
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
MODEL IDENTIFICATION
– MODEL NUMBER LABEL –
MODELParts No
GTR8B: E3
GTR8: E2/E51
GTR8: AR
GTR8B: AUS
GTR8: MX
GTR7: E2/E51
GTR7: AR
GTR7: MX
GTR6B: E3
GTR6: E2/E51
GTR6B: AR
GTR6B: AUS
4-126-681-0s
4-126-681-1s
4-126-681-3s
4-126-681-5s
4-126-681-6s
4-135-808-1s
4-135-808-3s
4-135-808-4s
4-135-809-0s
4-135-809-1s
4-135-809-3s
4-135-809-4s
• Abbreviation
E2 : 120V AC area in E model
E3 : 240V AC area in E model
E51 : Chilean and Peruvian model
AR : Argentina model
AUS : Australian model
MX : Mexican model
PART NO
4
TABLE OF CONTENTS
1. DISASSEMBLY
1-1. Case (Top) ............................................................................ 7
2. All LEDs and segments in fl uorescent indicator tube are light-
ed up. All LEDs are lighted up in red color except for [
LED where the LED is lighted up in red and blue color,
[ A] LED in blue color and SUBWOOFER ON/OFF in
green color.
3. When you want to enter to the model version and destination
display mode, press [DISC 1] button. The model information
appears on the fl uorescent indicator tube.
4. Each time [DISC 1] button is pressed, the display changes to
display software version and date of the software creation.
The sequence is model destination, SC, MDK, GC, SYS, CD,
CDMA, CDMB, ST, TC, TA, TM and MTR in this order, and
returns to the model destination display.
5. Press [DISC 2] button, the key check mode is activated.
6. In the key check mode, the fl uorescent indicator tube displays
“K 0 J0 V0”.
Turn the [OPERATIONAL DIAL] clockwise; ”J” value in-
creases by one. Turn the [OPERATIONAL DIAL] counterclockwise; “J” value decreases by one. Each time a button is
pressed, “K” value increases. Press other keys on main unit
to check whether the key is detected. However, once a button
has been pressed, it is no longer taken into account.
“V” value increases in the manner of 0,1, 2, 3 ... if [VOLUME]
kno b is t urned clo ckwise, or it decrea ses in the manne r of 0 , 9,
8, 7 ... if [VOLUME] knob is turned counterclockwise.
7. When [DISC SKIP/EX-CHANGE] button is pressed after
all LEDs and segments in fl uorescent indicator tube light
up, alternate segments in fl uorescent indicator tube and LED
would light up. If you press [DISC SKIP/EX-CHANGE] button again, another half of alternate segments in fl uorescent
indicator tube and LED would light up. Press [DISC SKIP/
EX-CHANGE] button again would cause all segments will
lights off and press [DISC SKIP/EX-CHANGE] button again
all segments will lights up.
8. To release from this mode, press three buttons in the same
manner as step 1, or disconnect the power cord.
B]
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
4. When the [VOLUME] knob is tur ned clockwise even slightly,
the sound volume increases to its maximum and a message
“VOLUME MAX” appears on the fl uorescent indicator tube.
5. When the [VOLUME] knob is tur ned counterclockwise even
slightly, the sound volume decreases to its minimum and a
message “VOLUME MIN” appears on the fl uorescent indica-
tor tube.
• Tape function (only for HCD-GTR6B/GTR8B)
1. Inserted a tape in deck. The function is changed to VIDEO
automatically when the recording is started by pressing [REC
TO TAPE] then press [ENTER] button. During recording the
ALC (Automatic Logic Control) is turned on.
2. During recording, press ALBUM - will stop the recording
and the function is changed to TAPE and rewind the tape in
Deck until the recording star t position and playback of the
tape in Deck is started.
• To release from MC Test mode
1. To release from this mode, press [POWER] button.
2. The cold reset is enforced at the same time.
[COLD RESET]
• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning the
set to the customer.
Procedure:
1. Press [x] button, [ENTER] button, and [POWER] button simultaneously.
2. The fl uorescent indicator tube becomes blank for a while, and
the set is reset.
[VACS ON/OFF]
• This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
1. Press [POWER] button to turn the set ON.
2. Press [x] button and [OPTIONS] button simultaneously. The
message “VACS OFF” or “VACS ON” appears on the fl uores-
cent indicator tube.
[MC TEST MODE]
• This mode is used to check operations of the respective sections
of Amplifi er and Tape.
2. The CD number indicators fl ash on the fl uorescent indicator
tube. The function is changed to VIDEO.
• Check of Amplifi er
1. Press [EQ BAND] button repeatedly until a message “GEQ
MAX” appears on the fl uorescent indicator tube. GEQ in-
creases to its maximum.
2. Press [EQ BAND] button repeatedly until a message “GEQ
MIN” appears on the fl uorescent indicator tube. GEQ de-
creases to its minimum.
3. Press [EQ BAND] button repeatedly until a message “GEQ
FLAT” appears on the fl uorescent indicator tube. GEQ is set
to fl at.
[TUNER STEP CHANGE]
• The step interval of AM channels can be toggled between 9 KHz
and 10 KHz. This mode is not available for Saudi Arabian models.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Press [TUNER/BAND] / [TU NER AM] button to select the
“A M”.
3. Press [POWER] button to turn the set OFF.
4. Press [ENTER] button and [POWER] button simultaneously.
The system will turn ON automatically. The message “AM
9K STEP” or “AM 10K STEP” appears on the fl uorescent in-
dicator tube and thus the channel step is changed.
17
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
[CD SHIP MODE (WITH MEMORY CLEAR)]
• This mode moves the optical pick-up to the position durable to
vibration and clears all data including preset data stored in the
RAM to initial conditions. Use this mode when returning the set
to the customer after repair.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Select CD function and waiting until CD no disc confi rm.
3. Press [x] button, [SOUND FLASH] button and [POWER]
button simultaneously. The set will power off automatically.
4. After the “STANDBY” blinking display fi nishes, a message
“MECHA LOCK” is displayed on the fl uorescent indicator
tube and the CD ship mode is set.
5. Then AC power OFF.
[CD SHIP MODE (WITHOUT MEMORY CLEAR)]
• This mode moves the optical pick-up to the position durable to
vibration. Use this mode when returning the set to the customer
after repair.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Select CD function.
3. Press [CD] button and [POWER] button simultaneously. The
set will power off automatically.
4. After the “STANDBY” blinking display fi n i s h e s , a m e s s a g e
“MECHA LOCK” is displayed on the fl uorescent indicator
tube and the CD ship mode is set.
5. The AC power OFF.
3. The VACS Level Display, the fl uorescent indicator tube dis-
plays “VATB F APC”. “V” represent VACS , A represent
VACS level which is triggered by signal level, “T” represent
Thermal VACS NEO, B represent VACS level which is triggered by temperature, “F” represent FAN is triggered by
software to turn in to high speed, “AP” represent APVACS
(Abuse Protection VACS) and “C” represent APVACS level
which is triggered.
[METER AGING TEST MODE]
• This mode use in factory to perform the non-stop aging mode for
meter device.
Procedure:
1. Press [POWER] button to turn on the system.
2. Press [EQ BAND/MEMORY] button and [METER MODE]
button simultaneously.
[ERROR MESSAGE]
1. METER ERROR CODE CHECK
• This mode is used to check the number of trigger for Meter Pointer
to initial switch and end switch. The switches will trigger during
meter initialize in AC supply on condition.
• This mode let you lock the disc tray. When this mode is activated,
the disc tray will not open when [OPEN/CLOSE] button or [EXCHANGE] button is pressed. The message “LOCKED” will be
displayed on the fl uorescent indicator tube.
Procedure:
1. Press [POWER] button to turn the set ON.
2. Select CD function.
3. Press [x] button and [OPEN/CLOSE] button simultaneously
and hold down until “LOCKED” or “UNLOCKED” displayed on the fl uorescent indicator tube (around 5 seconds).
[TCM OFFLINE MODE]
(only for HCD-GTR6B/GTR8B)
• This mode prevents set from power off automatically when TCM
is not connected. Therefore, measurements can be done even when
TCM is not connected.
Procedure:
1. When the system in turned off, press [EQ BAND/MEMORY]
button, [STOP] button and [POWER] button simultaneously.
The set will power on automatically.
2. The message “TCM OFFLINE” will be displayed on the fl uo-
rescent indicator tube.
The Meter Er ror Code will appear on the fl uorescent indicator
tube displays
• Display
Display on fl uorescent indicator tube,
IxxxxxMyyyyy
Ixxxxx = total number of Initial Switch touch by Meter
pointer. The Initial Switch will touch twice during meter
initialized process.
Myyyyy = total number of End Switch touch by Meter
pointer. The End Switch will touch one times during meter
initialized process.
[VACS DISPLAY]
• This mode is used to check the VACS level.
Procedure:
1. Press [POWER] button to turn on the system.
2. Press [x] button, [SOUND FLASH] button and [DISC SKIP/
EX-CHANGE] button simultaneously.
18
SECTION 3
MECHANICAL ADJUSTMENTS
(only for HCD-GTR6B/GTR8B)
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
2.9m N • m to 6.9m N • m
FWD CQ-102C 30 to 70 g • cm
(0.42 – 0.97 oz • inch)
FWD 0.15m N • m to 0.59m N • m
back tension CQ-102C 2 to 6 g • cm
(0.03 – 0.08 oz • inch)
2.9m N • m to 6.9m N • m
REV CQ-102RC 30 to 70 g • cm
(0.42 – 0.97 oz • inch)
0.15m N • m to 0.59m N • m
REV
CQ-102RC 2 to 6 g • cm
back tension
4.8m N • m to 16.7m N • m
FF/REW CQ-201B 49 to 170 g • cm
(0.68 – 2.36 oz • inch)
(0.03 – 0.08 oz • inch)
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
19
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
SECTION 4
ELECTRICAL ADJUSTMENTS
TUNER SECTION 0 dB = 1 µV
[FM Tune Level Check]
FM signal generator
SET
Procedure:
1. Turn the power on.
2. Input the following signal from Signal Generator to FM antenna input directly.
* Carrier Freq : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note: Please use 75 ohm “coaxial cable” to connect SG and the set. You
cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confi rm “TUNED” is lit on the display for A, B and C sig-
nals.
The mark of “TUNED” means “The selected station signal is
received in good condition.”
OUT (75 7)
DECK SECTION 0 dB = 0.775 V
(only for HCD-GTR6B/GTR8B)
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and RCH.
7. Switches and controls should be set as follows unless otherwise
specifi ed.
• Test Tape
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
[RECORD/PLAYBACK HEAD AZIMUTH
ADJUST-MENT]
Note: Perform this adjustments for Single deck
Procedure:
1. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
(L-CH & R-CH)
set
level meter
+
–
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
output
level
within
1dB
L-CH
peak
R-CH
peak
within
1dB
screw
position
L-CH
peak
screw
position
R-CH
peak
20
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
R-CH
oscilloscope
L
R
waveform of oscilloscope
HCD-GTR6/GTR6B/GTR7/GTR8/GTR8B
H
V
in phase
45o 90o 135o 180o
good
wrong
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
• Note For Printed Wiring Boards And Schematic Diagrams
Note on Printed Wiring Board:
• X: parts extracted from the component side.
• Y: parts extracted from the conductor side.
• : Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
• Indication of transistor.
• A : B+ Line.
• B : B– Line.
• Voltage and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• BD93 and Driver sections.
no mark : CD PLAY
• Except BD93 and Driver sections.
no mark : FM
( ) : CD PLAY
< > : TAPE PLAY
[ ] : TAPE REC
∗: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10
MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F : AUDIO
f : TUNER
E : TAPE PLAY
G : TAPE REC
N : MIC
J : CD PLAY
c : DIGITAL
I : USB
• Abbreviation
E2 : 120V AC area in E model
E3 : 240V AC area in E model
E51 : Chilean and Peruvian model
AR : Argentina model
AUS : Australian model
MX : Mexican model
Note: The components identifi ed by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specifi ed.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to fl ow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may also
be added to ordinary solder.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
4
W or less unless otherwise
specifi ed.
• 2 : nonfl ammable resistor.
• C : panel designation.
• Abbreviation
MX : Mexican model
TRANS board
SUBTRANS board
TUNER PACK
FRONT board
SUBWOOFER board
DMB19 board
C
Q
B
B
B
These are omitted.
E
Q
CE
These are omitted.
Q
CE
These are omitted.
HUB board
SW board
MOTOR (LD) board
MOTOR (TB) board
SENSOR board
DRIVER board
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