Yamaha CD-C600 User manual

CD-C600
Copyright © 2009 All rights reserved.
This manual is copyrighted by YAMAHA and may not be copied or
redistributed either in print or electronically without permission.
101145
SERVICE MANUAL
IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already known
and understood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury,
destruction of expensive components, and failure of the product to perform as specified. For these reasons, we advise
all YAMAHA product owners that any service required should be performed by an authorized YAMAHA Retailer or
the appointed service representative.
IMPORTANT:The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or
recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service
departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable and
specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the
distributor's Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body may have
accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).
IMPORTANT:Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit.
■CONTENTS
TO SERVICE PERSONNEL ........................................2–3
PREVENTION OF ELECTROSTATIC DISCHARGE ......4
FRONT PANEL ...............................................................5
REAR PANELS ...........................................................5–6
REMOTE CONTROL PANEL ..........................................7
SPECIFICATIONS ...........................................................8
INTERNAL VIEW ............................................................9
DISASSEMBLY PROCEDURES ............................. 10–14
STANDARD OPERATION CHART ......................... 15–16
TEST MODE .................................................................. 17
FACTORY MODE .......................................................... 18
UPDATING FIRMWARE .......................................... 19–23
DISPLAY DATA .............................................................24
IC DATA ...................................................................25–33
PIN CONNECTION DIAGRAMS .............................34–35
BLOCK DIAGRAM ........................................................37
PRINTED CIRCUIT BOARDS .................................38–46
SCHEMATIC DIAGRAMS .......................................47–52
REPLACEMENT PARTS LIST ................................53–61
REMOTE CONTROL .....................................................62
'09.09
P.O.Box 1, Hamamatsu, Japan
COMPACT DISC PLAYER
CD-C600

2
CD-C600
CD-C600
For U model
“CAUTION”
“F801: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 500mA,
250V FUSE.”
For C model
CAUTION
F801: REPLACE WITH SAME TYPE 500mA, 250V FUSE.
ATTENTION
F801: UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE 500mA, 250V.
This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive
harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON
WHATSOEVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or
expose eyes to solder/flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before
handling food.
1. Critical Components Information
Components having special characteristics are marked ⚠and
must be replaced with parts having specifications equal to those
originally installed.
2. Leakage Current Measurement (For 120V Models Only)
When service has been completed, it is imperative to verify
that all exposed conductive surfaces are properly insulated
from supply circuits.
• Meter impedance should be equivalent to 1500 ohms shunted
by 0.15 μF.
All of the P.C.B.s installed in this unit and solder joints are soldered using the lead free solder.
Among some types of lead free solder currently available, it is recommended to use one of the following types for the
repair work.
• Sn + Ag + Cu (tin + silver + copper)
• Sn + Cu (tin + copper)
• Sn + Zn + Bi (tin + zinc + bismuth)
Caution:
As the melting point temperature of the lead free solder is about 30°C to 40°C (50°F to 70°F) higher than that of the lead
solder, be sure to use a soldering iron suitable to each solder.
■TO SERVICE PERSONNEL
• Leakage current must not exceed 0.5mA.
• Be sure to test for leakage with the AC plug in both polarities.
WALL
OUTLET EQUIPMENT UNDER TEST
AC LEAKAGE
TESTER OR
EQUIVALENT
INSULATING
TABLE
WARNING: CHEMICAL CONTENT NOTICE!
About lead free solder
WARNING: Laser Safety
This product contains a laser beam component. This component may emit invisible, as well as visible radiation,
which may cause eye damage. To protect your eyes and skin from laser radiation, the following precautions must
be used during servicing of the unit.
1) When testing and/or repairing any component within the product, keep your eyes and skin more than 30 cm/1 feet
away from the laser pick-up unit at all times. Do not stare at the laser beam at any time.
2) Do not attempt to readjust, disassemble or repair the laser pick-up, unless noted elsewhere in this manual.
3) CAUTION: Use of controls, adjustments or performance of procedures other than those specified herein may result in
hazardous radiation exposure.

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CD-C600
CD-C600
Laser Emitting conditions:
1) When the Top Cover is removed, and the STANDBY/ON SW is turned to the “ON” position, the laser component will
emit a beam for several seconds to detect if a disc is present. During this time (5-10 sec.) the laser may radiate
through the lens of the laser pick-up unit. Do not attempt any servicing during this period!
If no disc is detected, the laser will stop emitting the beam. When a disc is loaded, you will not be exposed to any
laser emissions.
2) The laser power level can be adjusted with the VR on the pick-up PWB, however, this level has been set by the factory
prior to shipping from the factory. Do not adjust this laser level control unless instruction is provided elsewhere in this
manual. Adjustment of this control can increase the laser emission level from the device.
Type: GaAlAs
Wavelength: 790 nm
Laser output: max. 1.23 μW *
*This output is the value measured at a distance of about 200 mm from the objective lens surface
on the Optical Pick-up Block.
Laser Diode Properties
The primary side of the power supply carries live mains voltage when the player is connected to the mains even
when the player is switched off !
This primary area is not shielded so it is possible to accidentally touch copper tracks and/or components when servicing
the player.
Service personnel have to take precautions to prevent touching this area or components in this area.
Note:
The screws on the DVD mechanism may never be touched, removed or re-adjusted.
Handle the DVD mechanism with care when the unit has to be exchanged!
The DVD mechanism is very sensitive for dropping or giving shocks.
Warning for power supply

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CD-C600
CD-C600
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect
transistors and semiconductor “chip” components. The following techniques should be used to help reduce the incidence
of component damage caused by electrostatic discharge (ESD).
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD
on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging
ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static (ESD
protected)” can generate electrical charge sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil
or comparable conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the device will be installed.
CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as
brushing together of your fabric clothes or lifting of your foot from a carpeted floor can generate static electricity (ESD)
sufficient to damage an ES device).
Grounding for electrostatic breakdown prevention
1. Human body grounding.
Use the antistatic wrist strap to discharge the static electricity from your body.
2. Work table grounding.
Put a conductive material (sheet) or steel sheet on the area where the optical pickup is placed and ground the sheet.
Caution:
The static electricity of your clothes will not be grounded through the wrist strap. So take care not to let your clothes touch
the optical pickup.
■PREVENTION OF ELECTROSTATIC DISCHARGE
1M-ohms
Conductive material
(sheet) or steel sheet
Anti-static wrist strap

5
CD-C600
CD-C600
■FRONT PANEL
U, C, R, A, G, L models
U, C models
R, L models
■REAR PANELS

6
CD-C600
CD-C600
A model
G model

7
CD-C600
CD-C600
■REMOTE CONTROL PANEL
CDC9

8
CD-C600
CD-C600
“iPod” is a trademark of Apple Inc., registered in U.S. and other countries.
“Made for iPod” means that an electronic accessory has been designed
to connect specifically to iPod and has been certified by the developer to
meet Apple performance standards.
Apple is not responsible for the operation of this device or its compliance
with safety and regulatory standards.
■Audio Section
Output Level (1 kHz, 0 dB)
..........................................................................................2.0 ±0.3 V
Signal to Noise Ratio
................................................................................. 105 dB or more
Dynamic Range
................................................................................... 96 dB or more
Total Harmonic Distortion (1 kHz)
..................................................................................0.003 % or less
Frequency Response (2 Hz to 20 kHz)
............................................................................................. ±0.5 dB
Digital Output Terminal
.........................................................................................Optical x 1
Other Input/Output Terminal
...................................................................................Analog out L/R
USB
RS-232C
Remote control IN/OUT
■General
Power Supply
U, C models ............................................................ AC 120 V, 60 Hz
R, L models ........................... AC 110/120/220/230–240 V, 50/60 Hz
A model .................................................................. AC 240 V, 50 Hz
G model .................................................................. AC 230 V, 50 Hz
Power Consumption
.................................................................................................. 16 W
Standby Power Consumption
......................................................................................0.5 W or less
Dimensions (W x H x D)
..................................... 435 x 116 x 405 mm (17-1/8" x 4-5/8" x 16")
Weight
............................................................................... 6.2 kg (13.7 lbs.)
Finish
Black color ...................................................U, C, R, A, G, L models
Silver color.................................................................R, A, G models
Accessories
Remote control (CDC9) ................................................................x 1
Battery (R6, AA, UM-3) .................................................................x 1
Audio pin cable (1.0 m) ................................................................x 1
Power cable (1.5 m) .....................................................................x 1
*Specifications are subject to change without notice due to
product improvements.
■SPECIFICATIONS
U .......................U.S.A. model
C .................Canadian model
R ....................General model
A ................Australian model
G .................European model
L .................Singapore model
•DIMENSIONS
395 (15-1/2")
435 (17-1/8")
100 (3-7/8")
313 (12-3/8")16
(5/8") 116
(4-5/8")
405 (16")
Unit: mm (inch)

9
CD-C600
CD-C600
■INTERNAL VIEW
OPERATION (13) P.C.B. (R, L models)
OPERATION (10) P.C.B.
CM-230B UNIT
CLAMP ASS’Y
OPERATION (6) P.C.B.
MAIN P.C.B.
OPERATION (9) P.C.B.
OPERATION (14) P.C.B.
TRAY ASS’Y
OPERATION (5) P.C.B.
OPERATION (8) P.C.B.
OPERATION (7) P.C.B.
OPERATION (11) P.C.B.
OPERATION (12) P.C.B.
OPERATION (3) P.C.B.
OPERATION (2) P.C.B.
OPERATION (4) P.C.B.
OPERATION (1) P.C.B.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
12
11
1089
1
14
75
13
24
15 16 17 18
36

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CD-C600
CD-C600
Disc tray ass'y
Gear/L0
Front panel unit
Top cover
Plate / Table
Ta b l e
Clamp ass'y
Support / T
Disc tray ass'y
1
2
1
5
3
6
4
Fig. 1 Fig. 2
■DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
1. Removal of Top Cover
a. Remove 4 screws (①) and 3 screws (②). (Fig. 1)
b. Lift the top cover at the rear and move it rearward slantingly.
2. Removal of Clamp Ass’y
a. Remove 2 screws (③). (Fig. 1)
b. Remove the clamp ass’y. (Fig. 1)
3. Removal of Disc Tray Ass’y
a. Remove screw (④). (Fig. 1)
b. Turn gear/L0 counter clockwise gradually and stop before the disc tray starts to move. (Fig. 2)
CAUTION:
Gear/L0, if turned counter clockwise continuously, will mesh with the gear of the disc tray and the disc tray will come
out. When removing the disc tray, use care so that gear/L0 will not mesh with the gear of the tray.
c. Pull out the disc tray ass’y.
4. Removal of Table
a. Remove screw (⑤) and then remove the support/T. (Fig. 1)
b. Remove the plate/table. (Fig. 1)
*The plate/table cannot be reused. When removed, be sure to replace them with new ones.
c. Remove screw (⑥) and then take off the table. (Fig. 1)

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CD-C600
CD-C600
Fig. 3
Fig. 6
Fig. 7
Fig. 4
Fig. 5
• Precaution for installation of the Disc Tray Ass’y.
On disc tray ass’y setting.
Check the direction of marking “▲” on gear according
to this drawing. (Fig. 3)
CM-230B unit can not be removed without
removing the Front Panel Unit.
5-A. Removal of Front Panel Unit
a. Remove 2 screws (⑦) and 3 screws (⑧). (Fig. 6)
b. Remove CB6, CB304, CB804 and CB809. (Fig. 7)
c. Remove the front panel unit. (Fig. 6)
• IMPORTANCE: Installation of Table.
Install the table according to the following procedure.
a. Slide the lever so that the gear/RT1 becomes
free. (Fig. 4)
b. With the “▲” mark on the gear/RT1 aligned with
the same mark on the disc tray, lock it with the
lever. (Fig. 4)
c. Install the table by aligning it to the thick line on “ /”
mark. (Fig. 5)
*Check that the table is locked after installation.
Front panel
Gear/L0
Marking
Gear/L01
Fit the gear/RT1 to "▲" mark.
Gear/RT1
Lever
Lock
Unlock
Disc tray ass'y
Disc tray
Table
Fit the table to the thick line on " /" mark.
CM-230B unit
Front panel unit
7
7
8
CB809
CB304 CB6
CB804

12
CD-C600
CD-C600
CM-230B unit 9
9
9
9
Push rivets
Barrier cable
Push rivet
Push rivet
Barrier main
CB3CB302CB805, CB851 CB4
CB806
CB306
CB808
PU unit ass'y
10
Fig. 10
Fig. 11
6. Removal of PU Mechanism Unit
a. Remove 2 screws (⑩) and then remove the PU unit
ass’y. (Fig. 10)
b. Remove 4 screws (⑪) and then remove the PU
mechanism unit. (Fig. 11)
Fig. 8
Fig. 9
5-B. Removal of CM-230B Unit
a. Remove 2 push rivets and remove the barrier main.
(Fig. 8)
b. Remove 2 push rivets and remove the barrier cable.
(Fig. 8)
c. Remove 5 screws (⑨). (Fig. 8)
d. Remove CB3–4, CB302, CB306, CB805–806, CB808
and CB851. (Fig. 9)
e. Take the CM-230B unit out slowly. (Fig. 8)
PU mechanism unit
Spring
Spring
11
11

13
CD-C600
CD-C600
1
3
4
1
2
Hook
Hook
Push rivet
MAIN P.C.B.
OPERATION (11) P.C.B.
OPERATION (9) P.C.B.
Fig. 1
• When checking the P.C.B.s:
a. Remove the top cover.
b. Remove the disc tray ass’y.
c. Remove 3 screws (①) and 2 jack screws (②). (Fig. 1)
d. Remove push rivet. (Fig. 1)
e. Remove screw (③) and screw (④). (Fig. 1)
f. Release 4 hooks. (Fig. 1)
Fig. 12
• Operation Check Procedure
a. Disassembly
1) Remove the top cover.
2) Remove the clamp ass’y.
3) Unlock and remove the stabilizer from the holder.
Turn the plate clockwise by 30° while holding the stabilizer, and the plate will come off. Remove the stabilizer from
the holder. (Fig. 12)
b. Clamp the disc by using the stabilizer.
c. Set to the TEST mode and check for any faulty.
Frame damper Stabilizer
Plate
Holder
Lock
Unlock

14
CD-C600
CD-C600
Ground lead
Ground point (PJ601)
Ground lead
Ground point (ST301)
Ground lead
MAIN P.C.B.
Rear panel
Chassis
Cloth
G801
OPERATION (11) P.C.B.
OPERATION (9) P.C.B.
Fig. 2
Front panel unit
Chassis
5
6
5
Ground lead
Fig. 3
• Connect the ground points of the front panel unit to the chassis and MAIN P.C.B. (ST301), OPERATION (9) P.C.B.
(PJ601) and OPERATION (11) P.C.B. (G801) to the rear panel with a ground lead or the like. (Fig. 3)
• When connecting the flexible flat cable, be careful with polarity.
• Reconnect all cables (connectors) that have been disconnected.
g. Spread a cloth over the chassis. (Fig. 2)
h. Put the MAIN, OPERATION (9) and (11) P.C.B.s on end. (Fig. 2)
i. Remove 2 screws (⑤) and 3 screws (⑥). (Fig. 3)
j. Remove the front panel unit from the chassis.

15
CD-C600
CD-C600
■STANDARD OPERATION CHART
"OPEN" is displayed.
TRV signal is output until detection of FEED LIMIT switch.
Press the "OPEN/CLOSE" key.
Forced feed return operation.
Clamp down operation.
Laser on.
Disc scan.
Focus gain rough adjustment.
Focus search operation.
Spindle motor accelerated.
Tracking servo on.
Disc servo on.
VCO lock.
Disc table reset.
Tray open.
Tray closed.
Table rotate.
Disc search.
Disc mechanism unit clamped up.
FEED LIMIT switch search.
Proceeds to next step after detection of CLAMP switch. (SW501)
Stops after detection of LOADING switch. (SW502)
Proceeds to next step after detection of LOADING switch. (SW502)
DISC "1" is turned to DM clamp position.
Proceeds to next step after detection of CLAMP switch. (SW501)
FLSW = "L" (IC2, pin 32)
Tracking gain rough adjustment.
Tracking balance adjustment. (only tray open/close)
Focus balance adjustment.
Focus lock servo on.
DISC 1 " " flashes.
DISC 1 " " changes from flashing into lighting.
Load a disc in DISC 1.
Press the "PLAY" key or push the tray.
FLOCK = "H" →"L" (IC3, pin 22)
TLOCK = "H" →"L" (IC3, pin 23)
A

16
CD-C600
CD-C600
Press the "STOP" key.
Focus gain adjustment.
Tracking gain adjustment.
After searching the beginning, Mute is cancelled.
Mute on.
Track search.
After searching the beginning, Mute is cancelled.
Mute on.
Spindle motor stop.
Laser off.
Forced feed return.
*TOC READ *~ Data fetch cycle ~
Track No. "1" is searched.
~ PLAY ~
Set to search by means of " ", " " key.
~ PLAY ~
~ STOP ~
: MUTE ON = "H" →"L"
: MUTE OFF = "L" →"H", "0:00" appears on the display.
: MUTE OFF = "L" →"H", "0:00" is displayed.
: FLSW = "L" (IC3, pin 32)
A
(IC305, pin 7)

17
CD-C600
CD-C600
■TEST MODE
FL display
●Starting Test Mode
When starting the test mode, check the FL display and indicators for display/indication condition.
1. While pressing the “DISC 3”, “PURE DIRECT” and “ ” (Stop) keys of this unit as shown in the figure below, press the
“POWER ON/OFF” switch to turn on the power and keep pressing those 3 keys.
2. While keep pressing those 3 keys, check that all indicators (POWER, iPod/USB, PURE DIRECT) are lit. At the same
time, check that all segments of the FL display are lit.
3. Release those 3 keys. Then check that USB and PURE DIRECT indicators as well as all segments of the FL display
are turned off.
4. The Test Mode is activated.
●Operation Procedure of Test Mode
"POWER" indicator
"POWER ON/OFF" switch
"PURE DIRECT" indicator
While pressing these keys, press the “POWER ON/OFF” switch to turn on the power.
"iPod/USB" indicator
FL display
Release the keys
All segments ON All segments OFF
●Canceling Test Mode
Press the “POWER ON/OFF” switch of this unit to turn off the power.
Function list of remote control keys
Key Key code Function
OPEN/CLOSE 79-01 –
1 79-11 Laser on
2 79-12 Laser off
3 79-13 Focus operation
4 79-14 Traverse in *Press the “5” key to stop traverse.
5 79-15 Traverse stop
6 79-16 Traverse out *Press the “5” key to stop traverse.
7 79-17 Spindle reverse *Press the “8” key to stop spindle.
8 79-18 Spindle off
9 79-19 Spindle on *Press the “8” key to stop spindle.

18
CD-C600
CD-C600
■FACTORY MODE
●Starting Factory Mode
While pressing the “PURE DIRECT” and “ /” (Play/Pause) keys of this unit as shown in the figure below, press the
“POWER ON/OFF” switch to turn on the power.
The Factory Mode is activated.
Display provided when factory mode started
●Canceling Factory Mode
Press the “POWER ON/OFF” switch of this unit to turn off the power.
●Operation Procedure of Factory Mode
Function list of remote control keys
FL display
"POWER ON/OFF" switch
While pressing these keys, press the “POWER ON/OFF” switch to turn on the power.
FL display
LOADINGFACTORY NODISC
Key Key code Function
DISPLAY 79-0A
Firmware version of the microprocessor
(IC305 of the MAIN P.C.B.) is displayed. *Press the “CD/USB” key to select the CD mode
Firmware version of the USB IC
(IC7 of the MAIN P.C.B.) is displayed. *Press the “CD/USB” key to select the USB mode
CLEAR 79-0D EEPROM (IC304 of the MAIN P.C.B.) is initialized.

19
CD-C600
CD-C600
Top cover
Disc tray ass'y
Eject the disc tray
1
2
1
Disc tray ass'y
Gear/L0
Front panel unit
OPE:v1.09 Firmware version
Fig. 1
●Required tools
• Program down loader program
....................................................... FlashSta.exe
• Firmware
................................................... C5S3_xxxx.mot
C5S3_xxxx.id
• RS232C cross cable “D-sub 9 pin female”
(Specifications)
After replacing the following parts with the replacement parts, update the latest firmware according to the following
procedure.
MAIN P.C.B.
Microprocessor (IC305) of MAIN P.C.B.
■UPDATING FIRMWARE
●Preparation and precautions
• Download the firmware down loader program and
the latest firmware from the specified source to
the same folder of the PC.
• Prepare the above specified RS232C cross cable.
• While writing the firmware, keep the other application
software on the PC closed.
It is also recommended to keep the software on
the task tray closed as well.
●Confirmation of firmware version
Before and after updating the firmware, check the
firmware version by using the factory mode menu.
Start up the factory mode of this unit, and press the
“DISPLAY” key of the remote control. The firmware
version is displayed. (See “FACTORY MODE”)
Note down the displayed firmware version.
Pin No.2 RxD Pin No.2 RxD
Pin No.3 TxD Pin No.3 TxD
Pin No.5 GND Pin No.5 GND
Pin No.7 RTS Pin No.7 RTS
Pin No.8 CTS Pin No.8 CTS
●Connection
*Turn off the power of this unit and disconnect the
power cable from the AC outlet.
1. Remove 4 screws (①) and 3 screws (②), and
remove the top cover. (Fig. 1)
2. Eject the disc tray.
a. Turn gear/L0 counter clockwise gradually and
stop before the disc tray starts to move. (Fig. 1)
b. Pull out the disc tray ass’y. (Fig. 1)

20
CD-C600
CD-C600
4. Connect the RS-232C terminal located on the rear panel of this unit to the serial port (RS232C) of the PC with
RS232C cross cable as shown below. (Fig. 3)
Fig. 2
Fig. 3
3. Short circuit between both terminals of CB311 of the MAIN P.C.B.. (Fig. 2)
Note) Be sure to return the shorted terminals to their original condition after updating firmware.
Serial port (RS232C)
RS232C terminal
RS232C cross cable
PC This unit
Short
CB311 (2P)
MAIN P.C.B.
CB311