16 MODEL D User Manual
5.1.2 Lifting o the top panel
8. Turn o the MODEL D power.
9. Try and do the following steps quickly and carefully to keep any cooling
down to a minimum.
10. Carefully undo the 8 screws on the top panel as shown. There is no need to
undo any other screws.
11. Carefully lift the top panel assembly and turn it over so the PCB is facing
upwards. Be careful not to pull on the two cables from the lower side of the
main PCB. As your connections to other equipment are still in place, take care
not to pull out any cables or damage them.
12. Place a piece of cardboard or similar insulator between the controls and the
main chassis. This will help prevent damage to the controls as you lay the top
assembly onto the main chassis.
13. Make sure that the top panel is in a secure position and that it is not liable to
be dropped or damaged, or become disconnected with its internal cables or
the MIDI cables or headphone cable.
14. Double check that the MODEL D controls are still as shown on the previous
page, in case they were moved during the top panel removal.
15. Because the main PCB is exposed, make sure you are not touching it,
and that it is not touching any metal work that may cause a short-
circuit.
16. Turn on the MODEL D rear panel power switch and check that its Power LED
comes on.
17. Do not turn o the MODEL D or let it cool down, until all the calibrations are
completed.
18. If the A-440 switch is in the ON position, you should hear the tone in your
heaphones or main system if you carefully bring the headphone volume or
main volume up.
19. Now that everything is ready, inspect the bottom surface of the PCB as
shown on the next page.
Take care not to
pull on these cables
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