TH-55SF2U, TH-55SF2E, TH-55SF2W (serv.man2) - Panasonic TV Service Manual (repair manual). Page 57

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ADJ-14
SECTION 3 ADJUSTMENTS
<55SF2U/W/E>
6.  After finishing the writing, click [Verify] to verify whether the serial 
no. has been written on the board correctly.
3.3. Confirmation of version
1. Display the CAT mode (Refer to Section 1 - 3.1.)
2.  The CAT mode menu appears on the screen. Select the [CD Mode] menu with [pq] buttons and press the [MUTE] button 
for more than 3 seconds to enter the CD mode.
Serial no. display
Page of 61
Display

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