2008T Troubleshooting Guide
P/N 490292 Rev. A
P- 1.0.3 NOT BETWEEN 4.0 AND 6.0 VOLTS / ISOLATE KEYPAD’S POWER SWITCH
a) Figure below, unplug the keypad’s green ribbon cable from the UI-MICS board’s J4 connector.
b) Measure again at
R91, at the location shown in Figure 121 (previous page). TWO (2) possible
scenarios:
1) IF (and ONLY if) between 4.0 and 6.0 volts: The keypad is bad.
2) IF NOT between 4.0 and 6.0 volts: See procedure number P- 1.0.3.2 (page 689).
.
Figure 122 – Keypad’s J4 Cable Unplugged
P- 1.0.3.2 NOT BETWEEN 4.0 AND 6.0 VOLTS
a) Unlock the UI-MICS board THEN pull it ½ up i.e. remove it from its motherboard connector.
b) Measure again at
R91, per Figure 121 (previous page). TWO (2) possible scenarios:
1) IF (and ONLY if) between 4.0 and 6.0 volts: The UI-MICS board is bad!
2) IF NOT between 4.0 and 6.0 volts: See parts a AND b below:
a) Swap in a known good Power Logic board (known good = from another machine that is turning
on)!
b)
ENSURING the black lead remains connected to ground, measure again at
R91. Between 4.0 and 6.0 volts DC now?
Yes You should be able to turn the machine on now! The previous Power Logic board is
bad!
No NOT between 4.0 and 6.0 volts AND the machine will still not turn on! The motherboard
is bad.
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