User manual

ASURO - 25
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Now insert the Jumper (J1) for recheargable devices. The polarity marks of the ICs must align with
the marks of the sockets and the marks on the PCB. The processor has been designed to do a
selftest and it will check all components on power up. Just to avoid any dif culties in this phase,
you are advised to read the next chapter completely before switching power ON and then return
to this chapter. At this point we start testing. Switch the power ON and keep your eyes  xed to the
ASURO from now on.
5.3.1. Display-elements
The Status-LED (D12) shortly lights orange and the “Back-LEDs” (D15, D16) also glow, but these
glow only dimly. If one of these signs does not show, switch OFF immediatedly and start error
checking and removal (see paragraph 6.3.3). You just have seen the boot-sequence of ASURO. In
the next phase all display-elements will be checked subsequently at a distance of 3 seconds and
in the following order:
• Status-LED (D12) green
• Status-LED (D12) red
• Front-LED (D11) at the bottomside of the ASURO
• Back-LED (D15) left
• Back-LED (D16) right
• All display-elements together
If an error occurs, switch OFF ASURO immediately and start error checking and removal (see
paragraph 6.4.), as all display elements play an important role for all following tests.
5.3.2. Phototransistors (T9, T10)
After  nishing the display tests the Status-LED (D12) should light in green, indicating clearly the
Phototransistors at the bottomside of ASURO and responsible for line tracing, are now being
tested for about 10 seconds.
While lighting the Phototransistors (T9, T10), the accompanying Back-LEDs (D15, D16) will be
turned on and dim as soon as the light is switched off (right phototransistor(T10)
→
right back-LED
(D16); left phototransistor(T9)
→
left back-LED (D15)). Everything is OK, if the back-LEDs do not
go out completely after removing the light and continue glowing dimly. Even in case an error is
found, the selftest may be continued and the error removal may be postponed.
Electronics
When the program Hyperterminal (Windows) or minicom (Linux) is active
and there is a visible contact between ASURO and the Infrared-Transceiver
it is possible to follow the self test on you computer screen.