I have a communication error problem with the battery pack attached. As long as I connect the AC/DC line in, the camera boots properly.

Could just be a noisy power supply or a poor ground plane.

I just looked at the schematic and the only problem is likely the charging, or external power connection not connecting the battery when the plug is removed. A bit of De-Oxit spray may resolve the problem, or the connector itself may need to be repaired/replaced. This happens a lot with this type of connector.

faulty voltage regulator,
rectify pack not converting ac to dc current wires not connected properly
belt not tensioned properly
excessive current for a unit and the output is insufficient to charge the battery
take it to an accredited auto electrician to properly diagnosed the problem

take a look:

Power Status Check
The following LEDs indicate the power supply status:
q Battery LED
q DC IN LED
The power supply controller displays the power supply status through the Battery and the DC IN LEDs as listed in the tables below.
Table 2-1 Battery LED
Battery LED Power supply status
Lights orange Quick charge.
Lights green Battery is fully charged and AC adapter is connected
Blinks orange (even intervals) The battery level becomes low while operating the computer on battery power.*1
Flashes orange The power switch is pressed on when the battery level is low.*2
Doesn't light Any condition other than those above.*1 Low Battery Hibernation will be executed soon.
*2 Low Battery Hibernation has already been executed.

Table 2-2 DC IN LED
DC IN LED Power supply status
Lights green DC power is being supplied from the AC adapter.
Blinks orange Power supply malfunction*3
Doesn't light Any condition other than those above.
*3
When the power supply controller detects a malfunction, the DC IN LED blinks and an error code is displayed.

-------------------

Error Code Check
If the power supply microprocessor detects a malfunction, the DC IN LED blinks orange. The blink pattern indicates an error as shown below.
q
Start
Off for 2 seconds
q
Error code (8 bit)


"1"
On for one second

"0"
On for a half second

Interval between data bits
Off for a half second

The error code begins with the least significant digit.
Example: Error code 12h (Error codes are given in hexadecimal format.)

Convert the DC IN LED blink pattern into the hexadecimal error code and compare it to the tables below.

q DC IN
Error code
Meaning
10h
AC Adaptor output voltage is more than 16.5 V.
12h
Current from the DC power supply is more than the limit (6.05 A).
13h
Current from the DC power supply is more than the limit (0.5 A) when there is no load.
14h
Current sensing IC is not normal.

q Main Battery
Error code
Meaning
21h
Main battery charge current is more than 6.05 A.
22h
Main battery discharge current is more than 0.5 A when there is no load.
23h
Main battery charge current is more than 3.1A when DC IN direct charge is off.
24h
Current sensing IC is not normal.
25h
Main battery charge current is more than 0.3A when the battery isn't being charged.

q S3V output
Error code
Meaning
40h
S3V voltage is not more than 3.14V when the computer is powered on or off.
45h
S3V voltage is not more than 3.14V when the computer is supports CV and is booting up.

q C5V output
Error code
Meaning
50h
C5V voltage is more than 6.00 V when the computer is powered on or off.
51h
C5V voltage is not more than 4.50 V when the computer is powered on.
52h
C5V voltage is not more than 4.50 V when the computer is booting up.
53h
C5V voltage is not normal when the computer is suspended.
54h
C5V voltage is not normal when the computer supports CV and is suspended.
55h
C5V voltage is not more than 4.50V when the computer supports CV and is booting up.

q C3V output
Error code
Meaning
60h
C3V voltage is more than 3.96 V.
61h
C3V voltage is not more than 2.81 V when the computer is powered on.
62h
C3V voltage is not more than 2.81 V when the computer is booting up.
63h
C3V voltage is not normal when the computer is suspended.
64h
C3V voltage is not normal when the computer supports CV and is shut down.
65h
C3V voltage is not more than 2.81V when the computer supports CV and is booting up.

q PPV output (PCU core voltage)
Error code
Meaning
70h
PPV voltage is more than 1.56V when the computer is powered on or off.
71h
PPV voltage is not more than 0.68V when the computer is powered on.
72h
PPV voltage is not more than 0.68V when the computer is booting up.
73h
PPV voltage is not less than 0.68V when the computer is powered off.

q BGVSNS output
Error code
Meaning
80h
BGVSNS voltage is not more than 1.62V when the computer is on or off.
81h
BGVSNS voltage is not more than 1.02V when the computer is powered on.
82h
BGVSNS voltage is not more than 1.02V when the computer is booting up.
83h
BGVSNS voltage is not less than 1.02V when the computer is powered off.
84h
BGVSNS voltage is not more than 1.62V when the computer is suspended.

q 1R5-E1V output
Error code
Meaning
90h
1R5-E1V voltage is more than 1.80V when the computer is powered on or off.
91h
1R5-E1V voltage is not more than 1.275V when the computer is powered on.
92h
1R5-E1V voltage is not more than 1.275V when the computer is booting up.
93h
1R5-E1V voltage is not less than 1.275V when the computer is powered off.
94h
1R5-E1V voltage is not more than 1.275V when the computer is suspended.

q 1R8-E1V output
Error code
Meaning
A0h
1R8-E1V voltage is more than 2.16V when the computer is powered on or off.
A1h
1R8-E1V voltage is not more than 1.53V when the computer is powered on.
A2h
1R8-E1V voltage is not more than 1.53V when the computer is booting up.
A3h
1R8-E1V voltage is not less than 1.53V when the computer is powered off.
A4h
1R8-E1V voltage is not more than 1.53V when the computer is suspended.

q 2R5-SNS output
Error code
Meaning
B0h
2R5-SNS voltage is more than 3.00V when the computer is powered on or off.
B1h
2R5-SNS voltage is not more than 2.125V when the computer is powered on.
B2h
2R5-SNS voltage is not more than 2.125V when the computer is booting up.
B3h
2R5-SNS voltage is not less than 2.125V when the computer is powered off.
B4h
2R5-SNS voltage is not more than 2.125V when the computer is suspended.

q 1R25-E1V output
Error code
Meaning
C0h
1R25-E1V voltage is more than 1.50V when the computer is powered on or off.
C1h
1R25-E1V voltage is not more than 1.063V when the computer is powered on.
C2h
1R25-E1V voltage is not more than 1.063V when the computer is booting up.
C3h
1R25-E1V voltage is not less than 1.063V when the computer is powered off.
C4h
1R25-E1V voltage is not more than 1.063V when the computer is suspended.

q 2R5-E1V output
Error code
Meaning
D0h
2R5-E1V voltage is more than 3.00V when the computer is powered on or off.
D1h
2R5-E1V voltage is not more than 2.125V when the computer is powered on.
D2h
2R5-E1V voltage is not more than 2.125V when the computer is booting up.
D3h
2R5-E1V voltage is not less than 2.125V when the computer is powered off.
D4h
2R5-E1V voltage is not more than 2.125V when the computer is suspended.

---------------------
In the case of error code 10h or 12h:

Make sure the AC adaptor cord and AC power cord are firmly plugged into the DC IN 15 V socket and wall outlet. If the cables are connected correctly, connect a new AC adaptor and/or AC power cord, if necessary.

In the case of error code 2Xh:

Make sure the battery pack is correctly installed in the computer. If the battery pack is correctly installed, replace the battery pack with a new one.

If the error still exists, the system board or the battery board may be disconnected or damaged. Disassemble the computer and check the connection between the AC adaptor and the system board and connection between the system board and the battery board (if there is one, in my case it was integrated to ths system board).

After checking the connection, perform the following:
Check 1
Replace the AC adaptor with a new one. If the AC adaptor is still not functioning properly, perform Check 2.
Check 2
Use a multimeter to make sure that the F8800 fuse on the System board is not blown. If the fuse is not blown, go to Check 3. If the fuse is blown, go to Check 6.
Check 3
Use a multimeter to make sure that the F1000 fuse on the Battery board is not blown. If the fuse is not blown, go to Check 4. If the fuse is blown, replace the Battery board with a new one following the instructions in Chapter 4.
Check 4
Make sure that the Battery board cables are firmly connected to PJ8820 and PJ8821 on the System board and to PJ1000 and PJ1001 on the battery board. If they are connected firmly, go to Check 5.
Check 5
The Battery board or System board may be damaged. Replace it with a new one following the instructions in Chapter 4.


I hope this helps many people with the troubleshooting. Details may vary as models vary, but most if it is the same for every Toshiba

1. Most likely is discharged or improperly inserted batteries. Make sure to use freshly charged AA batteries that are inserted with the correct polarity. The Inner 2 have the minus side up and the outer 2 batteries have the + side facing up.

2. Close the battery door fully because the battery cover pushes on a small sensor that has to be closed before the camera will turn on. The battery cover slides and clicks into place. If the battery cover sensor is bent or damaged then the camera would not turn on. The battery cover sensor is tiny, and out of the way and probably not obvious that is has one.

3. Insert the proper memory card and close the memory card cover securely. If it's left open or not seated fully the camera may not turn on. I

4. Also remove the memory card and re-seat it, then close the cover again in case it was not fully closed.

5. Remove the batteries and check that the battery terminals are clean and they appear to be intact. For example, corrosion from leaking batteries could cause a poor connection.

6. Was the camera dropped? If it was dropped that can bend the metal battery contacts, then when you put the batteries in it doesn't really contact the battery properly.

7. If it still won't turn on have an electronics guy check it over, or at the local college electronics teacher. I've fixed these before and the main DC circuits are not too complicated. These camera's can even be powered up using a regulated 6V DC power supply connected properly to the battery terminals, (just for testing) and in that case you don't need batteries to tell that the camera works or not. These draw about 300mA of current when ran from 5V to 6V DC.

I attached a JPG photo showing a similar Canon A60 running via a DC power supply and no batteries. This one was apart at the time to fix a stuck zoom lens, and when it's apart there is no where to put the batteries so I have to power it this way.

You do not have to take it apart or use this method. I just mentioned this so it's clear that all it needs to run is 5 -6V DC from properly charged and inserted batteries (or an external source). Don't try connecting anything if you are not familiar with electronics because connecting it up wrong can damage the camera. Try the suggestions mentioned early and it will probably work since these are pretty reliable cameras.

No. You do have the battery charger, right? If not, get one
FYI
When connecting the AC adapter to the camera’s DC-IN jack, be careful not to
catch the plug on the jack’s cover.
● If the battery power runs out while the camera is connected to a computer,
image data may be corrupted. It is recommended that you use the optional AC
adapter when transferring images to a computer. Do not disconnect or connect
the AC adapter while the camera is communicating with the computer. Or just make sure your battery is fully charged!
● Power is consumed continuously during the conditions described below.
This could reduce the number of pictures that can be taken.
•When the monitor is turned on.
•Repeated auto-focus by pressing the shutter button halfway.
•Repeated power zoom adjustments.
•When communicating with a computer.
● Do not remove or load the battery and/or do not disconnect or connect the
AC adapter while the camera is turned on. Doing so could damage the camera’s settings or functions.

Kodak has 3 types of charger that can be connected to a wall socket
USB AC Adapter - is especially useful when traveling, away from your computer, or just plain on-the-go. Connect your camera's USB cable to the adapter and plug it into a wall outlet to conveniently charge your camera.
5V AC Adapter - Provides in-camera charging for all KODAK EASYSHARE M and V Series Digital Cameras
Input: AC 100-240 V 50/60 Hz Output : DC 5.0 V
3V AC Adapter - Provides direct power to your camera but it will not charge the camera battery
Input: AC 100-240 V 50/60 Hz Output : DC 3.0 V

* You need to check the type of adapter your using. If your using the 5V AC adapter or USB adapter and the camera won't charge the battery contact kodak support line 1 800 235 6325 (23KODAK) for possible repair.

I bought a replacement data battery BN-VF-808U from Digicowfish through Amazon.com. (?made by PomerPower).
It fits nciely to my JVC Everio GZ-MG330 which uses a BN-VF808U data battery. However, JVC gives a screen message:Communicating Error.
Now I have solved my Communication Error by using a jumper cable provided with the replacement battery BN-VF808U to connect the attached replacement battery to the camcorder. There is a DC input socket on the camcorder. There is also a DC input socket on the replacement battery for direct connection.


JZC

Battery back needs to be connected to the DVD player when charging. connect the batter pack to player. Run the DC/out from the battery pack to the DC/in in the player. plug the charger into the wall.

if that does not work, you have a bad battery

I had the same problem. I took off the battery pack and wiped the it down with a kleenex as well as the socket in the camera where the battery pack connects to. This fixed the problem.