How to disassemble Lenovo tablet - Lenovo YOGA Tablet 2-1371F - How to test the charger – How to remove the battery – How to remove the cover

Lenovo YOGA Tablet 2-1371F How to disassemble the tablet

To verify a symptom, follow the steps below:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the AC adapter.
4. Make sure that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the AC adapter and install the charged battery pack.
7. Make sure that the battery pack supplies power when you turn on the computer.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
“Checking the Computer AC Charger” 
“Checking the internal battery status” 
Checking the Computer AC Charger
When you use the computer AC Charger to charge the tablet but no power is charged, see the instructions in this topic to check the computer AC Charger.
To check the computer AC Charger, do the following:
1. Disconnect the micro-USB cable from the tablet.
2. Measure the output voltage across the connector marked B of the micro-USB cable. Refer to the following figure:

Note: The output voltage across pin 3 of the micro-B connector might be different from the one you are servicing.

3. If the voltage is not correct, replace the micro-USB cable.
4. If the voltage is acceptable, replace the system board.

Checking the internal battery status
To check the battery status of the tablet, do either of the following:
Approximate information about the battery status
Get the approximate status of the battery at any time by checking the battery status icon on the system bar in the upper-right corner of the screen. The shorter the green bar is, the less the battery power remains.
Accurate information about the battery status
To get the accurate information about the battery status of the tablet, do the following:
1. Open the Android Settings screen.
To open the Android Settings screen, do either of the following:

 From the main Home screen, touch the Android Settings icon on
Lenovo Launch Zone. The Android Settings screen is displayed.
Pull down the application icon from the action bar and then touch Settings. The Android Settings screen is displayed.
2. Touch Battery in the Device section on the Android Settings screen.
3. The accurate percentage of the remaining battery power is shown on the screen.

DISASSEMBLING PROCEDURE 

How to remove Rear cover
1. Push the button to unlock the hinge frame.

2. Open the hinge frame.

3. Open the card slot cover using a thin flat blade or guitar pick.

4. Remove screws 1 on the rear cover as shown in the figure below.

5. Separate the bottom right corner of the rear cover from the main body of the tablet using a suction tool as shown in the figure below.

6. Hold the tablet in one hand and use a guitar pick to unlock the rear cover from the tablet along the joint line as shown in the figure below.

7. Slowly remove the rear cover.

How to remove Battery pack

1. Remove screws 1 on the metal piece for fixing the battery FPC as shown in the figure below.

2. Remove the metal piece using a pair of pointed tweezers.

3. Disconnect the power supply to the tablet by detaching the battery FPC from its connectors on the main board using a pair of tweezers.

4. Remove the HDMI and audio jack FPC FRU.
5. Remove the right speaker FRU.
6. Remove the HDMI and audio jack FPC holder, by lifting the holder, and at the same time pushing the holder in the direction using a pair of tweezers as shown in the figure below.

7. Place the hinge frame in the closed position as shown in the figure below.

8. Slowly pull out the hinge pivot on the left side of the battery pack using a pair of tweezers.

9. Detach the connector of the USB and power key FPC from the main board using a pair of tweezers.

10. Remove the USB FPC holder, by lifting the USB FPC holder using a pair of tweezers, and at the same time pushing the USB FPC holder in the direction shown in the figure below.

11. Slowly pull out the hinge pivot on the right side of the battery pack using a pair of tweezers.

12. Remove the hinge frame from the main body of the tablet as shown in the figure below.

13. Peel off the foil on the battery cover at the side of the hinge frame with battery FPC.

14. Remove screw 1 on the battery cover as shown in the figure below.

15. Peel off the foil on the battery cover at the side of the hinge frame without battery FPC.

16. Remove screw 1 on the battery cover as shown in the figure below.

17. Remove the battery cover at the side of the hinge frame without battery FPC as shown in the figure below.

18. Push out the battery pack from the hinge frame from the side of the hinge frame without battery FPC.

19. Remove the battery pack from the hinge frame.

Lenovo A3500 – Tablet – Disassembling procedure – How to test the AC adapter – How to remove the battery

Lenovo A3500  How to disassemble, How to remove the battery, How to check the charger
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the AC adapter.
4. Make sure that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the AC adapter and install the charged battery pack.
7. Make sure that the battery pack supplies power when you turn on the computer.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
“Checking the Computer AC Charger” - “Checking the internal battery status” 
Checking the Computer AC Charger
When you use the computer AC Charger to charge the tablet but no power is charged, see the instructions in this topic to check the computer AC Charger. To check the computer AC Charger, do the following:
1. Disconnect the micro-USB cable from the tablet.
2. Measure the output voltage across the connector marked B of the micro-USB cable. Refer to the following figure:

Note: The output voltage across pin 3 of the micro-B connector might be different from the one you are servicing.
3. If the voltage is not correct, replace the micro-USB cable.
4. If the voltage is acceptable, replace the system board.

Checking the internal battery status
To check the battery status of the tablet, do either of the following:
Approximate information about the battery status
Get the approximate status of the battery at any time by checking the battery status icon on the system bar in the upper-right corner of the screen. The shorter the green bar is, the less the battery power remains.
Accurate information about the battery status
To get the accurate information about the battery status of the tablet, do the following:
1. Open the Android Settings screen.
To open the Android Settings screen, do either of the following:
From the main Home screen, touch the Android Settings icon on
Lenovo Launch Zone. The Android Settings screen is displayed.
Pull down the application icon from the action bar and then touch Settings. The Android Settings screen is displayed.
2. Touch Battery in the Device section on the Android Settings screen.
3. The accurate percentage of the remaining battery power is shown on the screen.

DISASSEMBLING PROCEDURE 

How to remove Rear cover and side key
1. Open the card slot cover on the rear cover using a guitar pick.

2. Remove screw 1 in the card slot recess.

3. Hold the tablet in one hand and use a guitar pick to unlock the rear cover from the tablet along the joint line as shown in the figure below.

4. Remove the rear cover.

How to remove Battery pack

1. Remove screw 1 for fixing the steel frame on the battery connector

2. Remove the steel frame from the front module as shown in the figure below.

3. Detach the battery FPC from its connector on the PCBA using a guitar pick.

4. Detach the battery pack from its seat by inserting a guitar pick into the joint surface and then cutting along the joint line in the direction shown in the figure below.

5. Remove the battery pack from the front module of the tablet.

Home security system construction using Laser beam

A low-cost, invisible laser circuit to protect your house from thieves or trespassers. A laser pointer torch, which is easily available in the market, can be used to operate this device

The block diagram of the unit shown depicts the overall arrangement for providing security to a house. A laser
torch powered by 3V power-supply is used  for generating a laser beam.
A combination of plain mirrors M1 through M6 is used to direct the laser beam around the house to form a net. The laser beam is directed to finally fall on an LDR that forms part of the receiver unit as shown in Fig.
Any interruption of the  beam by a thief/trespasser will result into energize the alarm. The 3V power-supply circuit is a conventional full wave rectifier-filter circuit. Any alarm unit that operates on 230V AC can be components. When switches S1 and S2 are activated, transformer X1, followed by a full-wave rectifier and smoothing capacitor C1, drives relay RL1 through the laser switch.
The laser beam should be aimed continuously on LDR. As long as the laser beam falls on LDR, transistor T1 remains forward biased and relay RL1 is thus in energized condition. When a person crosses the line of laser beam, relay RL1 turns off and transformer X2 gets energized to provide a parallel path across N/C contact and the pole of relay RL1.
In this condition, the laser beam will have no effect on LDR and the alarm will continue to operate as long as switch S2 is on.
When the torch is switched on, the pointed laser beam is reflected from a definite point/place on the periphery of the house. Making use of a set of properly oriented mirrors one can form an invisible net of laser rays as shown in the block diagram. The final ray should fall on LDR of the circuit.
Note. LDR should be kept in a long pipe to protect it from other sources of light, and its total distance from the source may be kept limited to 500 meters.
The total cost of the circuit, including the laser torch, is Rs 500/= or less.

How to assemble a Radio Control Electric Switch

This switch is quite simple but has some great features and worth a try. All of the parts are readily available from most electronics stores or if you tinker with electronics a bit you may have them in your junk box as odd spares.

How to make the printed circuit

Board as it is so easy and is a rewarding experience to complete the whole job yourself. There are no suggestions of how to mount the switch.
As you can see by the photo, didn't put it in a case as it would just add weight and  can't see why it would need it if you can have it held by foam rubber. I cut a cavity out of some foam and wrapped a rubber band around it all.
The relay is mounted away from the circuit so the motor current has less effect and cause glitches and mounted with double foam tape.T the relay away from the board to keep electrical interference to a minimum.
The circuit doesn't have to be made like this as you could have a go at building it up on a veroboard but I do find it a fair bit harder, somedon't. It is a bit bigger than it's commercial counterparts but this is as small as I think most people can go with an ordinary soldering iron and tools.
A 6v relay seems to work fine even though the receiver voltage is only 4.8v. There are no pads included on the P.C board for the switching side of the relay as it depends on what sort is used. Be sure to find one that can handle the current that is put through it and do a good job of the soldering as there is a lot of vibration in a model aircraft. A double pole relay can be wired to short out the motor when power isn't on so a folding prop can stop rotating and fold properly. See diagram. Adjust the trim pot so that the relay turns on at the desired position of the radio stick.

Note: there is a slight delay in switching.  You can get a receiver plug by buying a servo extension lead and cutting it to the desired length.

To make the Printed Circuit  Board

Things needed

Blank board copper on one side. (Fibreglass is preferable but the older bakalite type material is ok. It fractures easier though)
Dalo pen
Ferric chloride (You can get it already as a solution or as powder and mix it yourself. Read the warnings about it's corrosive properties as you may end up with no sink pipes.)
Carbon paper (The same sort of stuff that you get in receipt books etc.)

Draw out diagram by placing the carbon paper onto copper face and the master on top. Then fill in the tracks you've drawn onto the copper with the Dalo pen. Cut board to size & put in Ferric Chloride till excess copper is etched. You could warm up the ferric chloride to make it work a little quicker. Swish the solution around a bit to keep fresh solution up to the copper. Wash & clean up then drill holes. The holes are quite small and you may need to but that size drill at an electronics store as well. Centre punch the
holes first makes it easier to drill.

See the prototype

You may need to obtain a chart that shows how to orientate the transistors the right way. In the diagram there are markings for each leg as B,E,C which is base, emitter and collector. These have to be the right way round and as they vary on different transistors of the same sort you'll have to do some digging yourself or as the supplier of the parts.
The Integrated circuit the electrolytic capacitor and the diode are the other three parts that must go the right way. The IC usually has a notch or similar at the end that corresponds with pin one marked on the diagram.

The diode has a black band at one end and that also can be seen on the diagram. The capacitor usually has negative or positive marked on the case and you'll see the + marked on the board diagram.
The trim pot RV1 uses only the middle and one outside leg. Just bend the other out of the way.
To find the way to wire the receiver plug, look on your servo wires and see if there is a red, black and another color wire as it is probably red for positive, black for negative.

Layout and print details

CX-BK7 Aiwa DVD DECK RECEIVER How to assemble the mechanism

HOW TO INSTALL THE CAM (EJECT LOCK)

Rotate the cam (BU U/D) fully in the direction of arrow.
2 Engage the gear (eject lock) and the gear of the cam (eject lock) aligning the mark with the center of the gear (eject lock)

HOW TO INSTALL THE CAM (GEAR)

Check that the cam (BU U/D) can not be rotated in the direction of arrow.
2 Align the mark on the cam (gear) with the boss as shown in the figure and install the cam (gear).

HOW TO INSTALL THE GEAR (MODE 2)

1 Align the mark on the rotary encoder (S701) with the projection of the assy.

2 Check that the cam (BU U/D) can not be rotated in the direction of arrow.
3 Install the gear (mode 2

HOW TO INSTALL THE GEAR (MODE CAM)

1 Slide the shaft in the direction of arrow.
2 Align mark A on the gear (mode cam) with mark B on the slider (mode cam) assy, then install the gear (mode cam).
3 Check that mark C on the gear (mode cam) is in alignment with mark D on the cam (gear).

HOW TO INSTALL THE ROTARY ENCODER (S702), GEAR (STOCKER COMMUNICATION), HOW TO INSTALL THE CAM (STOCKER U/D)

PHASE ADJUSTMENT BETWEEN PINIONS (SLIDER) AND SLIDER-1 TO 5 (L/R)

1 As shown in the following figure, adjust the portion A of each slider to the boss with the slider-1 to 5 (L) and the slider-1 to 5 (R) pushed in the arrow directions respectively (see Fig)

2 Paying attention to the up/down direction of the pinion (slider) (see Fig. 2), install each pinion (slider) so that the portion B of each pinion (slider) meshes with the portion A of each slider (see Fig. 3).
Note: Push in the pinion (slider) until the claw of the boss comes out above the pinion (slider) to lock.

How to disassemble the optical pick-up mechanism: OPTICAL PICK-UP SECTION (DVBU16V)

SW (1) BOARD, SW (2) BOARD, SW (3) BOARD, SW (4) BOARD, BRACKET (TOP) ASSY and RELAY BOARD

MOTOR (STOCKER) ASSY (STOCKER) (M761): MOTOR (ROLLER) ASSY (ROLLER) (M781): MOTOR (MODE) ASSY (MODE) (M771)

TIMING BELT (FRONT/REAR):  CAM (GEAR):  SENSOR BOARD

How to discharge the flash capacitor, how to enter the service mode, Error codes, factory reset Panasonic 3D HD video Camera HDC SDT750, HDC TM750

PANASONIC HDC SDT750   HDC TMT750

How to Discharge the Capacitor on Flash P.C.B.
CAUTION:
1. Be sure to discharge the capacitor on FLASH P.C.B..
2. Be careful of the high voltage circuit on FLASH P.C.B. when servicing.
Discharging Procedure
1. Refer to the disassemble procedure and Remove the necessary parts/unit.
2. Put the insulation tube onto the lead part of Resistor (ERG5SJ102:1kΩ /5W).
(an equivalent type of resistor may be used.)
3. Put the resistor between both terminals of capacitor on FLASH P.C.B. for approx. 5 seconds.
4. After discharging confirm that the capacitor voltage is lower than 10V using a voltmeter.

How to Replace the Lithium Battery
Replacement Procedure
1. Remove the MIC AMP P.C.B.. (Refer to Disassembly Procedures.)
2. Remove the Lithium battery (Ref. No. “B6401” at component side of MIC AMP P.C.B.) and then replace it into new one.

NOTE:
This Lithium battery is a critical component.
(Type No.: ML-614S/ZTK )
It must never be subjected to excessive heat or discharge.
It must therefore only be fitted in requirement designed specifically for its use.
Replacement batteries must be of same type and manufacture.
They must be fitted in the same manner and location as the original battery, with the correct polarity contacts observed.
Do not attempt to re-charge the old battery or re-use it for any other purpose.
It should be disposed of in waste products destined for burial rather than incineration.

How to Define the Model Suffix (NTSC or PAL model)

There are seven kinds of HDC-SDT750/TMT750.
a) HDC-SDT750PP
b) HDC-SDT750EB/EF/EG/EP
c) HDC-SDT750EE
d) HDC-TMT750GT
e) HDC-TMT750GK
f) HDC-TMT750GD
g) HDC-SDT750GC, TMT750GC
What is the difference is that the “INITIAL SETTING” data which is stored in Flash ROM mounted on Main P.C.B..

NOTE:
After replacing the MAIN P.C.B., be sure to achieve adjustment.
The adjustment instruction is available at “software download” on the “Support Information from NWBG/VDBG-AVC” web-site in
“TSN system”, together with Maintenance software.

Service Mode
1. Indication method of the service menu
Set the mode dial “Motion Picture Recording” mode.
2. Turn the power on, and then while keep pressing the “Zoom lever” to W side, “Intelligent auto/Manual” button and “Menu” button for more than 3 seconds until the top screen of the Service Mode Menu being displayed

Service mode menu

Screen display	Contents	Function
1	Factory settings	Function to throw a product up in a factory shipment state (When recorded data in Built-in memory, “error display” is done)
3	Built-in memory self check execution (HDC-TMT750 only)	Function to check self as for the state of Built-in memory
4	Lock search history indication	Display the camera system error cord for three histories saved in EEPROM
5	Power ON self check result display	Power ON self check (function to diagnose correct function of the device and interface between devices) result display

NOTE:

Do not using service mode except above table of Service mode menu.
3. End method of the top screen of the service mode menu
Push the “Menu” button to end the service mode, and then POWER OFF.

Built-in Memory Self Check Execution (HDC-TMT750 only)
Touch the [ 3 ] of LCD, select Built-in memory self check execution.

Indication contents
# Built-in memory self check result display
Display the Built-in memory self check execution.
Displays other than “OK” are abnormalities of Built-in memory.
Push the “Menu” button to end the service mode, and then POWER OFF.
Lock Search History Indication
Touch the [ 4 ] of LCD, select Lock search history indication.

Indication contents
# Lock search history indication
Display the camera system error cord for three histories saved in EEPROM.
# The error cord contents which are displayed

Error code	Function
51	Focus control is abnormal
52	Zoom control is abnormal
53	OIS lens control is abnormal
71	Lens cover open/close is abnormal
72	Cooling fan is abnormal
73	High temperature is abnormal
33	Communication between camera to ARM is abnormal

Push the “Menu” button to end the service mode, and then POWER OFF.

Power ON Self Check Result Display
Touch the [ 5 ] of LCD, select Power ON self check result display.

Indication contents
# Power ON self check result display
Function to diagnose correct function of the device and interface between devices result display.
Display the following commnucation test result.
- CAM-PWR : Commnucation test between IC2006 to IC301
- CAM-UNI : Commnucation test between IC3401 to IC301
Display other than “OK” are abnomalities of each lines.
Cutting of battery connection or AC power supply connection to end the service mode.

CAUTION  (When servicing FLASH P.C.B.)
1. Be sure to discharge the capacitor on FLASH P.C.B..
Refer to “HOW TO DISCHARGE THE CAPACITOR ON FLASH P.C.B.”.
The capacitor voltage is not lowered soon even if the AC Cord is unplugged or the battery is removed.
2. Be careful of the high voltage circuit on FLASH P.C.B..
3. DO NOT allow other parts to touch the high voltage circuit on FLASH P.C.B.

Factory Setting
PROCEDURE
1. Set the mode dial “Motion Picture Recording” mode.
2. Turn the power on, and then while keep pressing the “Zoom lever” to W side, “Intelligent auto/Manual” button and “Menu” button for more than 3 seconds until the top screen of the Service Mode Menu being displayed.

3. Touch the [ 1 ] of LCD.
4. Touch the [ YES ] of LCD.
5. After few seconds “END” is displayed on LCD monitor. Cutting of battery connection or AC power supply connection as a completion of the “FACTORY SETTINGS”.

The factory settings clean up and/or refresh the following settings.
1. MENU, MODE, ADJUSTMENT VALUE.
2. SD card format.
3. Reset the folder number and file number of still pictures.
(Setting the folder number is 100, and file number is 0.)
4. Clear the mechanism lock information.
5. Clear the service mode information contents.
6. Close the lens cover
7. Initialize the VIERA Link Physical Address.
8. Confirm the data of Built-in memory is cleared. (only HDC-TMT750)

PANASONIC HC V700, HC V707 - High Definition Video Camera How to enter the Service mode, Factory reset, Flash discharge, How to replace the battery, Error codes

PANASONIC HCV700, PANASONIC HCV707

Service Mode

1. Indication method of the service menu Set the mode switch “Motion Picture Recording” mode.
2. While the power is turned OFF, keep pressing the “Power” button, “Zoom lever” to W side and “intelligent auto/Manual” button for more than 3 seconds until the top screen of the Service Mode Menu being displayed.

Service mode menu

Screen display	Contents	Function
1	Factory settings	Function to throw a product up in a factory shipment state (When recorded data in Built-in memory, “error display” is done)
3	Built-in memory self check execution (HC-V700M/V707M only)	Function to check self as for the state of Built-in memory
4	Lock search history indication	Display the camera system error cord for three histories saved in EEPROM
5	Power ON self check result display	Power ON self check (function to diagnose correct function of the device and interface between devices) result display
9	Forced full flash emission	Forced full flash emission for discharging the capacitor on FLASH P.C.B. and set to prohibit charge
10	Erasing the lock histories	Erasing the error histories (working time is not erased)
12	Camera data indications while the video playback	Display the camera informations (Shutter speed, Iris value, White balance and focal length) while playing recorded video

NOTE:

Do not using service mode except above table of Service mode menu.
3. End method of the top screen of the service mode menu Touch the [ EXIT ] of LCD to end the service mode, and then POWER OFF.

Built-in Memory Self Check Execution (HC-V700M/V707M only)
Touch the [ 3 ] of LCD, select Built-in memory self check execution.

Indication contents
# Built-in memory self check result display
Display the Built-in memory self check execution.
Displays other than “OK” are abnormalities of Built-in memory.
Touch the [ BAK ] of LCD to end the service mode, and then POWER OFF.
Lock Search History Indication
Touch the [ 4 ] of LCD, select Lock search history indication.

Indication contents
# Lock search history indication
Display the camera system error cord for three histories saved in EEPROM.
# The error cord contents which are displayed

Error code	Function
51	Focus control is abnormal
52	Zoom control is abnormal
53	OIS lens control is abnormal
54	Zoom control is abnormal
71	Lens cover open/close is abnormal
73	High temperature is abnormal

Power ON Self Check Result Display

Touch the [ 5 ] of LCD, select Power ON self check result display.

Indication contents
# Power ON self check result display
Function to diagnose correct function of the device and interface between devices result display. Display the following communication test result.
- CAM-PWR : communication test between IC3401 and IC1503
- CAM-UNI : Internal communication test of IC3401
Display other than “OK” are abnomalities of each lines.
Cutting of battery connection or AC power supply connection to end the service mode.

Forced full flash emission
Touch the [ 9 ] of LCD, select Forced full flash execution.

Indication contents
# Discharging the capacitor without using register.
Forced full flash emission for charge capacitor completely discharge.
To prevent electric shock, we recommend enforcement before disassembling.
Cutting of battery connection or AC power supply connection to end the service mode.

Erasing the lock histories
Touch the [ 10 ] of LCD, select erasing the lock histories execution.

Indication contents
# Erasing the error histories stored in EEPROM. (working time is not erased) Cutting of battery connection or AC power supply connection to end the service mode.
Camera data indications while the video playback
Touch the [ 12 ] of LCD, select indicating the camera informations while playing back the recorded video.

Indication contents
# While playing back the recorded videos, the camera informations (Shutter speed, Iris value, White balance and focal length) are
superimposed on the LCD screen.

Factory Setting
How To Turn On The Factory Settings
1. Set the mode switch “Motion Picture Recording” mode.
2. While the power is turned OFF, keep pressing the “Power” button, “Zoom lever” to W side and “intelligent auto/Manual” button
for more than 3 seconds until the top screen of the Service Mode Menu being displayed.

3. Touch the [ 1 ] of LCD.
4. Touch the [ YES ] of LCD.
5. After few seconds “END” is displayed or “ESD NODATA” as “NG” is displayed on LCD monitor. Cutting of battery connection or AC power supply connection as a completion of the “FACTORY SETTINGS”.
(After recording at least once, even if the physical format of the build-in memory will be performed, “ESD NODATA” as “NG” is indicated, but “FACTORY SETTINGS” is completed.)

The factory settings clean up and/or refresh the following settings.
1. MENU, MODE, ADJUSTMENT VALUE.
2. SD card format.
3. Reset the folder number and file number of still pictures.
(Setting the folder number is 100, and file number is 0.)
4. Clear the mechanism lock information.
5. Clear the service mode information contents.
6. Close the lens cover
7. Initialize the VIERA Link Physical Address.

How to Discharge the Capacitor on Flash P.C.B.
CAUTION:
1. Be sure to discharge the capacitor on FLASH P.C.B..
2. Be careful of the high voltage circuit on FLASH P.C.B. when servicing.
Before disassembling, perform "6.4. Forced full flash emission" for discharging capacitor.
The capacitor also can be discharged according to the following procedures.
Discharging Procedure
1. Refer to the disassemble procedure and Remove the necessary parts/unit.
2. Put the insulation tube onto the lead part of Resistor (ERG5SJ102:1kΩ /5W). (an equivalent type of resistor may be used.)
3. Put the resistor between both terminals of capacitor on FLASH P.C.B. for approx. 5 seconds.
4. After discharging confirm that the capacitor voltage is lower than 10V using a voltmeter.

How to Replace the Lithium Battery
Replacement Procedure
1. Remove the MIC P.C.B.. (Refer to Disassembly Procedures.)
2. Unsolder the each soldering point of electric lead terminal for Lithium battery (Ref. No. “B4801” at component side of MIC P.C.B.) and remove the Lithium battery together with electric lead terminal. Then replace it into new one.
NOTE:
The Type No. ML-614S/DK includes electric lead terminals.

NOTE:
This Lithium battery is a critical component.
(Type No.: ML-614S/DN Manufactured by Energy Company, Panasonic Corporation)
It must never be subjected to excessive heat or discharge.
It must therefore only be fitted in requirement designed specifically for its use.
Replacement batteries must be of same type and manufacture.
They must be fitted in the same manner and location as the original battery, with the correct polarity contacts observed.
Do not attempt to re-charge the old battery or re-use it for any other purpose.
It should be disposed of in waste products destined for burial rather than incineration.