NAD C 546BEE User manual

NAD
C 546BEE
COMPACT
DISC PLAYER C 546BEE COMPACT DISC PLAYER
SERVICE MANUAL

- 2 -
SAFETY INFORMATION
CAUTION
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS:-
(1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND
(2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED,
INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED
OPERATION.
The lightning flash with arrowhead, within an equilateral tri-
angle is intended to alert the user of the presence of
uninsulated "dangerous voltage" within the product's
enclosure; that may be of sufficient magnitude to consti-
tute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intend-
ed to alert the user of the presence of important operating
and maintenance (servicing) instructions in the literature
accompanying the appliance.
CLASS 1
LASER PRODUCT

- 3 -
SERVICE SAFETY PRECAUTIONS
1. Replacing the fuses
CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE
OF FUSE.
Reference No Part Number Description
FC201 5120-0050+0 FUSE T1.6A/250V 5X20
FC202, FC204, FC205 5120-0018+0 FUSE T1A 250V 5X20
FC203 5120-0035+0 FU T100MA 250V
F101 5120-1169+0-C FUSE 0.8A 250V 8.35X4.3
2. Safety check out
(Only U.S.A. model)
Before returning the product to the customer, make leakage current or resistance measurements to determine that
exposed parts are acceptably insulated from the supply circuit.
Parts marked with the symbol are critical with regard to the risk of fire and electric shock.
Replace only with parts recommended by the manufacturer.
CONTENTS
DESCRIPTION PAGE
SPECIFICATIONS .............................................................4
REAR PANEL / FRONT PANEL...................................................5
DISASSEMBLY INSTRUCTIONS .................................................6
BLOCK DIAGRAM .............................................................7
WIRING DIAGRAM ............................................................8
RF PATTERN TESTING.........................................................9
IMPORTANT NOTES........................................................10-12
MCU UPGRADE PROCEDURE ...............................................13-19
SERVO UPGRADE PROCEDURE ...............................................20
PCB LAYOUT..............................................................21-24
SCHEMATIC DIAGRAM......................................................25-30
IC BLOCK DIAGRAM........................................................31-37
TROUBLESHOOTING GUIDE...................................................38
ELECTRICAL PARTS LIST ...................................................39-53
TRAVERSE EXPLODED VIEW..................................................54
TRAVERSE EXPLODED VIEW PARTS LIST.......................................55
EXPLODED VIEW ............................................................56
EXPLODED VIEW PARTS LIST ...............................................57-58
PACKING DIAGRAM ..........................................................59
HISTORY CHANGE...........................................................60

- 4 -
SPECIFICATIONS
GENERAL PARAMETERS
Output level Analog: 2.2 ± 0.1 V
Optical: -22.5 ± 3.5 dBm
Coaxial: 950 ± 100 mV
Frequency response ±0.3 dB (ref. 0 dB 20 Hz-1 kHz)
±0.5 dB (ref. 0 dB 5 kHz-20 kHz)
Total harmonic distortion <0.01% (ref. 1 kHz, Audio LPF)
Signal/Noise ratio 118 dB
(ref. 1 kHz, A-weighted LPF Stop, Pause)
Channel balance ±0.5 dB (ref. 0dB 1kHz)
Dynamic range 95 dB
Channel separation >90 dB
De-emphasis -3.73 to -5.33 dB (ref. 0dB 1 kHz, 5 kHz)
-8.04 to -10.04 dB (ref. 0dB 1 kHz, 16 kHz)
Linearity ±0.01 dB (ref. 0dB 1 kHz at -3 dB)
±0.02 dB (ref. 0dB 1 kHz at -6 dB)
±0.02 dB (ref. 0dB 1 kHz at -10 dB)
±0.05 dB (ref. 0dB 1 kHz at -20 dB)
±0.15 dB (ref. 0dB 1 kHz at -60 dB)
Standby power <0.5W
USB
Output level 2.2 ± 0.2 V
Frequency response ±1 dB (ref. 0 dB 20 Hz - 16 kHz)
Total harmonic distortion <0.03% (ref. 0 dB 1 kHz, Audio LPF)
Signal/Noise ratio 118 dB
(ref. 0 dB 1 kHz, A-weighted Pause)
DIMENSION AND WEIGHT
Unit Dimensions (W x H x D) 435 x 306 x 89 mm (Gross)*
17 1/8x 12 ¹¹/16 x 3 9/16 inches
Net weight 4.9 kg
10.8 lbs
Shipping weight 6.3 kg
13.9 lbs
* - Gross dimensions include feet, extended buttons and rear panel terminals.
Specications are subject to change without notice. For updated documentation and features, please log onto www.
NADelectronics.com for the latest information about C 546BEE.

- 5 -
1. LINE OUT
2. DIGITAL OUT (COAXIAL, OPTICAL)
3. +12V TRIGGER IN
4. IR IN
5. AC MAINS INPUT
1. STANDBY BUTTON
2. STANDBY LED
3. DISC TRAY
4. STOP/OPEN
5. SOURCE
6. RANDOM
7. DISPLAY
8. SCAN
9. USB INPUT
10. PLAY/PAUSE/SKIP
11. VFD
12. REMOTE SENSOR
REAR PANEL / FRONT PANEL
REAR PANEL
FRONT PANEL
1 2 3 4 5
1 2 3 4 5 6 7 8 9 10
11 12

- 6 -
7
6
6
5
4
3
1
2
DISASSEMBLY INSTRUCTIONS
1. Remove machine screws M 4.0 x 6.0 ( 1 to 4 ) from the side panels.
Remove tapping screw 3.0 x 8.5 ( 5 )from the back panel.
Refer to Figure No.1.
Figure No.1
2. Pull both sides of the TOP COVER slightly outwards 6 and tilt approx. 35˚ and then remove
in the direction as indicated by the arrow 7 . Refer to Figure No.2.
Figure No.2.

- 7 -
BLOCK DIAGRAM
VFD Key
Keyboard
MCU IC206
TMP86FS49
VFD, Key, DAC
U202
Electromotor drive
And loader control
U209
DAC WM8740
TA7291
IR in Trigger in Coaxial out
Optical out RCA R/L out
U201
74HCU04
SPDIF
IR
U3
74HC86
TransformerAC in
EMI inductor
+12V -12V -28V D+5V +5V +8V
7805/7809/7812/7912
Loader MM1669
Motor drive
IC3
IC703
T5CJ3-7D13 IC701
TC94A93
SERVO
Mainboard Servoboard

- 8 -
WIRING DIAGRAM
1 2 3
Reset
RXD
TXD GND
CPU_5V
L
R
120V
230V
CD8V
GND
1.5V
CL_SW
JGND
OP_SW
LM_CL
LM_OP
SPDIF
DATA
BCLK
LRCLK
MCLK
GND
USB_DET
USB_UPDATE
ACK
AM1
DETECT
USB_RST
MCU_RST
AC1
AC2
-28V
D+5V
KGND
KEY1
KEY0
V_R2
V_R1
VFD_CLK
VFD_DATA
VFD_CE
VFD_INH
CPU_5V
DGND
LED
REMOTE
2
17
18
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.15.
16.
17.
18.DGND
1
PCB-C54626+MAIN
1726-072A+000B
Issue B
RESET
DET
T1.6AL250V
T1AL250V
T1AL250V
100mAL250V
T1AL250V
P217
P218P219
JGND
JGND
JGND
JGND
JGND
J222
Remote toMCU
Remote fromKeyboard
DGND
DETECT
CPU_5V
TXD RXD
DGND
CPU_5V
USB_TX
USB_RX
T800mAL 250V
RCA_CH
X201
C216
C219
Q216
C220 C223
C203
C312
C314
C316
C310
C264
C265
C266
C267
C268
Q205
Q202
C269
C270
C271
Q203
C273
L201
Q204
C226
C230
C233C237
C238C240
Q210
Q211
Q212
Q213
C245
C247C249
C251
C253
D210
C254
Q206 C255
Q207
C257
D213D214
C258
C259
C208
C214
Q201
D202
L202
D204
D205
D208
C235
C272
H207
H202
H203
H204H206
H201
C277
C285
D218
C323
C324
P202
P203
R289
R241
R335
R334
R243
R302
R306
Q208
Q209
J219
P204
P205
L2
C15
R290
D209
CN103
R24
C115
D6
C113
D7
D11
Q10
D8
D13
D14
D15
R264
Q9
C16
D12
X202
L203
J220
D203
U203
D206
J217
J218
D211R262
RL202
RL201
J209
J210
FC201
FC202
FC203
FC204
FC205
U210
U211
AC201
U202
IC202
IC203
U205
U206
U207
J214
C210
C211
CON201
J201
J202
J203
J204
J207
RCA201
U204
R243
D201
D1
C243
RCA202
J215
C201
C10
L1
C11
U2
C12
C13
C14
J205
JMP120
JMP46
JMP121
JMP83
JMP88
JMP92 JMP82
JMP47
JMP84
JMP90
JMP40
JMP22
JMP24
JMP43
JMP76
JMP72 JMP51
JMP2
JMP13
JMP26
JMP27
JMP30
JMP25
JMP28
JMP32
D239
R140
JMP38
JMP33
JMP48
JMP49
JMP54
JMP52
JMP50
JMP57
JMP59
JMP56JMP55 JMP62
JMP99
JMP78
JMP29
JMP60
JMP71
JMP100
JMP73
D238
JMP18
JMP94
JMP63
JMP61
JMP19
JMP91
JMP53
JMP58
JMP69
JMP77
J216
JMP11
JMP10
JMP131
JMP133 JMP139
JMP75
JMP132
JMP21
JMP45 JMP124 JMP115
JMP86
JMP80
JMP6
JMP14
JMP15
JMP16
JMP17
JMP7
JMP68
JMP67
JMP119
JMP41
JMP42
JMP1
JMP5
JMP3
JMP128
JMP122
JMP98 JMP125
JMP102
JMP126
JMP113
JMP36
JMP34
JMP31
JMP123
JMP127
JMP135
JMP136
JMP85
JMP81
JMP70
JMP37
JMP66
JMP74
JMP12
JMP137
JMP138
JMP35
SW201
D21
D23
D22
D24
L102
C114
D107
R21
D105
R22
C17
U116
R23
D108
C18
C110
C109
R117
R27
L103
C116
C112
C111
U101
JMP64 JMP20
CN1A
JMP9
JMP4
JMP93
JMP8
JMP106
JMP129
JMP130
JMP141
JMP142
JMP143
JMP114
JMP87
JMP144
JMP145
JMP146
JMP147
JMP148
JMP151
JMP152
JMP140
JMP79
JMP153
JMP44
JMP134
JMP158
D16
JMP155
D17
R33
D2
JMP150
F101
JMP156
JMP157
JMP159
JMP163
JMP164
D5
T100
AC1
AC2
-28V
+5V
GND
KEY1
KEY0 V_R2
VR_1 VFE_CLK
VFD_DATA
VFD_CE
VFD_INH VFD_5V
GND
LED
REMOTE GND
STOP/OPEN SOURCE RANDOM DISPLAY SCAN LEFT SCAN RIGHT
GND
1726-072A+000B
PCB-C54626+KEY
Issue B
CN102B
R105
R104
R115
C104
REMO101
C102
Z101
JMP39
JMP117
JMP105
JMP108
JMP111
JMP110
JMP109
JMP97
JMP107
JMP112
JMP104
JMP95
JMP101
JMP89
JMP23
S105
S103S104
S107S108
S109S1
S2
JP110
CON101
JMP154
JMP65
JMP160
JMP116
JMP96
JMP161
JMP162
JMP118
JMP103
JMP149
GND
POWER
1726-072A+000B
PCB-C54626+SKIP
Issue B
JP109
T1
PCB-C54626+SW1 1726-072A+000B
Issue B
3-BLUE
1-AMBER
CN102A
D4
S3
1726-072A+000B PCB-C54626+USB
Issue B
CN2
JP108
GN_CH
1 3
4 6
SLT-
SLT+
FM-
FM+
DM-
DM+
FE-
TE-
TE+
FE+
PD
VR
LD
GND
F
C
B
A
D
E
SVCC
VREF
T5CJ3-7D13
TC94A93FG
CL-SW
OP/CL-COM
OP-SW
LM-CL
LLM-OP
GND
USB-
USB-
USB-
DET
UPDATE
POWER
AM1
MCU-
TEST
USB-
RST
MCU-
RST
USB-
RX
USB-
TX
VCC
D-
D+
DGND
PCB-C54626+SERVO
1725-970B+000B
Q701
Q71
Q2
C707 C708
C712
C715
C717
C734
C735
C743
C744
C745
C746
C27
C28
C29 C52
C56
C6
C7
C701
C702
C705
C706
C710
C713
C714
C716
C719
C721
C723
C724
C728
C731 C733
C737
C738
C740
C742
C756
C760
C761
C765
C768
C770
C771
C772
C774
C775
C777
C781
C783
C757
C791
C711
C718
C726 C727
C763 C764
C703
C704
C720
C722
C725
C730
C732
C741
C766
C767
C769
C773
C776
C778
C779
C780
C782
C25
C51
C76
C60
C75
C739
C785
C26
C8
C758
C759
C762
C53
C54
C59
C74
C77
C78
D5
D6
L703
L705
L706
L707
L708
L709
CN701
L10
L11
U11
IC3
CN08
JR0
JR701
R1
R10
R11
R16
R19
R2
R23
R3 R4
R46
R50
R52
R53
R55
R56
R57
R63
R64
R65
R66
R67
R7
R701
R702
R703
R704
R705
R706
R707
R708
R709
R710
R711
R712
R713
R714
R715
R716
R717
R718
R719
R720
R721
R722
R723
R724
R725
R727
R728 R729
R730 R731 R732
R733
R734
R735 R736
R737
R738
R739
R740
R741
R742
R743
R744
R745
R746
R747
R748
R749
R750 R751 R752R753
R756
R757
R758
R759
R760
R761
R762
R763
R764
R765
R766
R767
R768
R769
R770
R771R772
R773
R774
R775 R776
R777 R778
R779 R780
R781
R782
R783
R8
R823
R824
R825
R826
R827
R828
R829
R51
R54
R20
R21
R22
R48
R49
R13 R14
CN4
IC707
IC4
IC6
IC701
IC703
X702
R15
R30
C729
C736
X701
R31
R32
R33
R34
R35
R36
C784
C2 C5
C1
J215
IC1
Q220
C3 C4
R17
R18 R25
R27
R5
R6
R9
CN1B
Q1
R12
R24
R26
R830
R28
R29
R37
JP108
1V5
8V
BCLK
DATA
GND
LRCLK
MCLK
SPDIF
J220
J1
CD MECHANISM
SWITCH Board
KEY Board
SERVO Board
SKIP Board
USB Board
MAIN Board
TRANSFORMER
AC IN

- 9 -
RF PATTERN TESTING
NAD - C 546BEE PCB TESTING POINTS DIAGRAM
TESTING PROCEDURE
(1) Load the test disc (Sony Test CD YEDS-7) and set the unit into PLAY mode.
(2) Connect the scope to C3 (Pin 4 of IC701) and DGND (J215).
Scope setting: Coupling : AC.
Vertical sensitivity : 0.2 V/ div.
Horizontal time base : 0.5 µS/div.
(3) Observe the waveform is 1.5V p-p +/-5% and the eye pattern is at its best shape (see FIG. 1).
FIG. 1 (a) FIG. 1 (b) Poor eye pattern
FIG. 1 (C) Good eye pattern
3T 4T 5T – 11T
1 3
4 6
SLT-
SLT+
FM-
FM+
DM-
DM+
FE-
TE-
TE+
FE+
PD
VR
LD
GND
F
C
B
A
D
E
SVCC
VREF
T5CJ3-7D13
TC94A93FG
CL-SW
OP/CL-COM
OP-SW
LM-CL
LLM-OP
GND
USB-
USB-
USB-
DET
UPDATE
POWER
AM1
MCU-
TEST
USB-
RST
MCU-
RST
USB-
RX
USB-
TX
VCC
D-
D+
DGND
PCB-C54626+SERVO
1725-970B+000B
Q701
Q71
Q2
C707 C708
C712
C715
C717
C734
C735
C743
C744
C745
C746
C27
C28
C29 C52
C56
C6
C7
C701
C702
C705
C706
C710
C713
C714
C716
C719
C721
C723
C724
C728
C731 C733
C737
C738
C740
C742
C756
C760
C761
C765
C768
C770
C771
C772
C774
C775
C777
C781
C783
C757
C791
C711
C718
C726 C727
C763 C764
C703
C704
C720
C722
C725
C730
C732
C741
C766
C767
C769
C773
C776
C778
C779
C780
C782
C25
C51
C76
C60
C75
C739
C785
C26
C8
C758
C759
C762
C53
C54
C59
C74
C77
C78
D5
D6
L703
L705
L706
L707
L708
L709
CN701
L10
L11
U11
IC3
CN08
JR0
JR701
R1
R10
R11
R16
R19
R2
R23
R3 R4
R46
R50
R52
R53
R55
R56
R57
R63
R64
R65
R66
R67
R7
R701
R702
R703
R704
R705
R706
R707
R708
R709
R710
R711
R712
R713
R714
R715
R716
R717
R718
R719
R720
R721
R722
R723
R724
R725
R727
R728 R729
R730 R731 R732
R733
R734
R735 R736
R737
R738
R739
R740
R741
R742
R743
R744
R745
R746
R747
R748
R749
R750 R751 R752R753
R756
R757
R758
R759
R760
R761
R762
R763
R764
R765
R766
R767
R768
R769
R770
R771R772
R773
R774
R775 R776
R777 R778
R779 R780
R781
R782
R783
R8
R823
R824
R825
R826
R827
R828
R829
R51
R54
R20
R21
R22
R48
R49
R13 R14
CN4
IC707
IC4
IC6
IC701
IC703
X702
R15
R30
C729
C736
X701
R31
R32
R33
R34
R35
R36
C784
C2 C5
C1
J215
IC1
Q220
C3 C4
R17
R18 R25
R27
R5
R6
R9
CN1B
Q1
R12
R24
R26
R830
R28
R29
R37
JP108
1V5
8V
BCLK
DATA
GND
LRCLK
MCLK
SPDIF
J220
J1
Test Point

- 10 -
IMPORTANT NOTES
INSTRUCTION FOR HANDLING OPTICAL SYSTEM BLOCK PICK-UP
Electrostatic breakdown of the laser diode in the optical system block may occur due to a potential difference caused
by electrostatic charge accumulated on clothing, human body, etc. A ground must be provided as follows to prevent
any electrostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a ground band (1M ohm) that is properly to remove any static electricity that may be charged on the
body.
2. Ground for Work Bench
Be sure to place a conductive sheet (1M ohm) or copper plate with proper grounding on the work bench or other sur-
face on which the pick-up is to be placed.
3. Because the static electricity charge on the clothing does not discharge through the body grounding band, do not
let clothing to get in contact with the pick-up unit.
PRECAUTIONS FOR CHECKING BEAM EMISSION
The laser beam of this unit is focused on the reflecting surface of the objective lens in the optical system block.
Therefore, keep your eyes at least 12 inches (30 cm) away from the objective lens when the laser diode is ON.
(Operation Check Method for Laser Diode and Focus Search Function.)
When the POWER switch is turned ON after the chucking plate is removed, observe the objective lens and confirm
that the following operations are performed properly.
(The optical system should be at the lead-in area position when it is checked at this time.)
(1) The laser should be at the innermost position after the chucking plate is removed.
(2) The diffused light of the laser beam can be seen when the POWER switch is turned ON.
(3) Vertical (up and down) movement of the objective lens (2 or 3 times) will take place.
INCORRECT CORRECT
NOTE: Laser diodes are so susceptible to damage from
static electricity that even if a static discharge does not
ruin the diode, it can shorten its life or cause it to work
improperly.
1.Grounding band
1M ohm
1M ohm
2.Conductive Sheet
or Copper Plate

- 11 -
PRECAUTIONS WHEN CHANGING LASER PICK-UP
When removing the pick-up assembly, short circuit the PCB tracks on the optical block as show in the drawing in
order to protect the pick-up before removal.
NOTE: Replacement pick-up assemblies are supplied with the PCB pattern already protected.
DO NOT REMOVE THE SHORT CIRCUITS UNTIL YOU HAVE FINISHED FITTING THE PICK-UP.
Caution:
Laser diodes are extremely susceptible to damage from static electricity. Even if a static discharge does not ruin
the diode, it can shorten its life or cause it to work improperly. When replacing the pick-up, use a conductive mat, a
grounded soldering iron, and so on, to protect the laser diode from static damage.
Ground Conductive
Wrist Band for Body
Ground Line
Less than
10 ohm
Conductive Gum Mat
Soldering
Iron with
Ground
wire
Protective soldering place
for laser diode

- 12 -
MULTI-KEY TABLE FOR C546BEE
Item Content Multi-key
1 MCU Ver Display + <<
2 Servo Ver Display + >>
3 Factory Test Display + K_PANEL_PLAY
4 TRAY COUNT RANDOM + <<
5 PLAY TIME RANDOM + >>
6 AUTOSTANDBY ENABLE/DISABLE RANDOM + K_PANEL_PLAY
7 CLEAR ALL Source + <<. Then input password “546546”

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MCU UPGRADE PROCEDURE - TMP86FS49(MCU)
1. Upgrade via USB interface on C546BEE unit
Upgrading via USB interface is available for units with MCU ver 0.4.4 or later version. And every unit with any version
can be upgrade via UART interface, maybe with different passwords.
Put the software le for upgrade into the root folder of a USB device and rename it as ‘host.h16’, and upgrade as
following procedure:
1). Power on C546BEE, Long press the panel key ‘Display + << (fast backward)’,not at reading or playing status is
better. The VFD will display the MCU software version such as ‘MCU Ver 0.4.4’as below:
2). Press the panel ‘Play’ key while displaying the MCU software version, then the VFD will display ‘Updt MCU SW?’.
3). Press panel ‘Play’ again and the VFD will display ‘MCU Updating’.
MCU upgrading starts and it would last about 1 to 2 minutes. If upgrading is not successful or no le for upgrade in the
USB device, the VFD will display ‘MCU Updt Fail’. The unit will enter standby status after successfully upgrading.

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2. Upgrade via UART interface
2.1 Hardware connection
1). Connect the programmer board to the unit through the FFC connector at the rear panel, shown as below picture:
2.2 Software setup
Password setting is different for different version and other setting is the same as describe below:
2.2.1 Upgrade from Ver0.4.3 to Ver 0.4.4 or later versions
2.2.1.1 Open Flash Programmer, click Setup, select Device, shown as below:

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2.2.1.2 Browse to the le for upgrade.

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2.2.1.3 Setup communication Port and data rate.
2.2.1.4 Setup password, Shown as below:

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2.2.2 Upgrade from Ver0.4.4 or later versions to another later version
2.2.2.1 Setup Password, Shown as below:
Click Auto(Search from Password Log File), then click Search from le, shown as below:
Then a pop up window would require you choose the le for upgrade, browse to the le and select it.

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Click OK and it will show as below.
2.3 Upgrade procedure
1). Open Flash Programmer and plug in C546BEE, the buttons will be illuminated. If the buttons are still grey, try to
unplug and plug in the unit again.

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2). Click A button, it will start auto programming.
3). When the programming nishes, it will pop up the below window, Click No to nish the upgrading.
4). User can press the panel keys to check the MCU version as below for different software version:
Source + << (fast backward): Ver 0.4.3 and elder versions.
Display + << (fast backward): Ver 0.4.4 and later versions.

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SERVO UPGRADE PROCEDURE
1. Upgrade servo software via USB interface
Put the software le for upgrade into the root folder of a USB device and rename it as ‘bp2.s24’, plug the USB device
into the unit, and upgrade as following procedure:
1). Power on C546BEE, Long press the panel key ‘Display + >> (fast forward)’,not at reading or playing status is better.
The VFD will display the servo software version such as ‘Servo Ver 0.7’as below:
2). Press the panel ‘Play’ key while displaying the servo software version, then the VFD will display ‘Updt BP SW?’
3). Press panel ‘Play’ again and the VFD will display ‘BP Updating’.
Servo upgrading starts and the whole procedure would last about 1 to 2 minutes. If there is no USB device, the VFD
will display ‘USB Not Ready’, and display ‘No File’ when there is no le for upgrade. The system will enter standby state
when it nishes upgrading.