UB-5365, UB-5865 (serv.man2) - Panasonic Other Service Manuals Service Manual (repair manual). Page 112

112

Does not startup;
nothing is 
displayed.

1. The CONTROL Board does not
    operate properly.

1. Remove the Panaboard’s Power cord from the outlet and 

reinsert it. Check the initial operation and see whether
system starts up.

2. The DC power is not supplied to the

CONTROL Board.

1. Remove the Panaboard’s Power Cord from the outlet

and reinsert it. Check the initial operation and see
whether system starts up.

2. Check the following connection.

(1) Between CN251 (POWER Board) and CN1002

 (CONTROL Board)

(2) Between CN252 (POWER Board) and CN1003 

(CONTROL Board)

(3) Between CN253 (POWER Board) and CN1004 

(CONTROL Board)

3. Check the following signals on the POWER Board.

 (1) 24 V related standard voltage

C252 both ends voltage: 24 V

 (2) Signal voltage (ON/OFF signal)

CN253-2nd pin voltage: Every time the “Power Key”
on the Control Panel is pressed the voltage level
changes between high and low.

 (3) 24 V (motors)

F251 voltage: 24 V

 (4) 24 V (Thermal Printer Head)

TH251 voltage: 24 V

 (5) 5 V and 3.3 V signal-related:

F252 voltage: 3.3 V
CN253-1st pin voltage: 5 V
CN252-3rd pin voltage: 5 V

 (6) Check each voltage.

Voltage between C205 (+ side) and C206 (- side)
: 250 to 350 V

4. Replace faulty parts or the POWER Board

3. PANEL Board or its connection
     circuit is faulty.

1. Remove the Panaboard’s Power Cord from the outlet

and reinsert it. Check the initial operation and see
whether system starts up.

2. Checking the connection between CN300 (PANEL

 Board) and CN1008 (CONTROL Board)

3. Check the following:

 (1) Q300 and Q301 S-pin voltage: 5 V
 (2) D301 and D302 1st pin voltage: 5 V
 (3) Check the soldering state of Q317 to Q323, and if

 there is a problem, provide resoldering.

4. Replace faulty parts or the PANEL Board.

Key input on the
Control Panel is
invalid.

The PANEL Board is not operating 
correctly.

1. Check the connection between CN300 (PANEL Board)

and CN1008 (CONTROL Board)

2. Check the soldering state of SW300 to SW306 and Q308

to Q313 on the PANEL Board, and if there is a problem,
provide resoldering.

3. Check the following signals on the PANEL Board.

CN300-17th pin (while pressing SW300): 0 V (low level)
CN300-19th pin (while pressing SW301): 0 V (low level)
CN300-21st pin (while pressing SW302): 0 V (low level)
CN300-23rd pin (while pressing SW303): 0 V (low level)
CN300-24th pin (while pressing SW304): 0 V (low level)
CN300-5th pin (while pressing SW305): 0 V (low level)

4. Replace faulty parts or the PANEL Board.