The service port is either hidden under a small lid, which can be opened for example with a screwdriver, or accessible by removing the whole top cover plate of the machine (2 screws plus some plastic hooks).
Then, a plastic 5-pin connector can be taken out of its mounting, and one can see that only four of the sockets are connected to colored wired, as the diagram tries to show:
+-------------------------------+ ylo = yellow
| ylo ./. ora red brn | ora = orange
| ( ) ( ) ( ) ( ) ( ) | red = red
| | brn = brown
+------#-----------------#------+ ./. = not connected
" "
^-----------------^----------- "noses" for orientation
Assumptions about the pin usage:
ylo |
+5V |
wired to Vcc |
ora |
RxD |
wired to an input pin |
red |
GND |
reference for all other voltages measured |
brn |
TxD |
when there is a Rx, there must be a Tx |
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