UB-T760 - Panasonic Other Service Manuals Service Manual (repair manual). Page 22

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Contents of error are distinguished by the frequency of blinking of red color LED. When an error occurs, the red color LED blinks
several times after the red color LED goes out approx. 1 second. This frequency of blinking (of red color LED) indicates the error
status. The following is the error status table.   

Error

Frequency 

of blinking

Possible Cause

Check Point

Infrared Error

1

The interval of the infrared radiation is
not within limits (30 ms ±10%), and this
phenomenon has been generated con-
tinuously 5 times or more. 

1. Turn off and on the power, then recheck.
2. Check the place where the elite Panaboard is installed. And, avoid

the following places for proper operating.

• Direct sunlight or strong light
• Near the side wall
• Near the ceiling (Placing the top of elite Panaboard near to the

ceiling)

• Near the vents of an air conditioner

3. Replace the battery or Electronic Pen.
4. Confirm TP3 signal on control board.
5. Replace or repair the part(s) having the problem or sensor board.

Temperature
Error

3

The thermo sensor, which senses the
ambient temperature, detects 1

°C

(3.9

°F)  or  less  [or  50°C (197°F) or

more].

• The connection between the sensor

board and control board is not cor-
rect.

• The ambient temperature is abnor-

mal [1

°C or less (or 50°C or more)].

1. In the normal ambient temperature [1

°C - 50°C (33.8°F - 122°F)], turn

off/on the power, and recheck.

2. Check the connection between connectors CN600 & CN601 on sen-

sor board and connector CN300 on control board.

3. Check the soldering of IC312 (CPU).
4. Replace or repair the part(s) having the problem, sensor board or

control board.

USB Error

4

USB device controller is abnormal.

1. Check  the  soldering of IC318 (USB device controller) on control

board. 

2. Replace or repair the part(s) having the problem or control board.

Backup Mem-
ory (EEPROM) 
Error

5

The data in the backup memory is
abnormal.

1. Check the soldering of IC311 (EEPROM) on control board. 
2. Check the soldering of IC312 (CPU) on control board. 
3. Replace or repair the part(s) having the problem or control board.

SRAM Error

6

SRAM access error

1. Check the soldering of IC313 (SRAM) on control board. 
2. Replace or repair the part(s) having the problem or control board.

RAM Error

7

RAM (CPU internal) access error 

1. Check the soldering of IC312 (CPU) on control board. 
2. Replace or repair the part(s) having the problem or control board.