Casio CTK-4200 Service Manual page 20

<Notes On Assembly>
• To install the M828-PSA1 PCB of BACK-LIGHT-UNIT, tighten the screws for the LCD part in the
order indicated with the numbers below. If not tighten correctly, it may cause the LCD display
errors.
5 1
6 4
D. REMOVE THE SPEAKER
D-1. Unsolder two lead wires.
D-2. Undo four screws and then remove the SPEAKER.
<Left speaker>
Lead wire (White)
Lead wire (Green)
3 7
M828-PSA1 PCB
2 8
– 18 –
CTK-4200
<Right speaker>
Lead wire (Brown)
Lead wire (Blue)