2008T Troubleshooting Guide
P/N 490292 Rev. A
P- 1.0.4 R91 BETWEEN 4.0 AND 6.0 VOLTS / ISOLATE KEYPAD’S POWER KEY
a) Continuing to measure at resistor R91 press and release the Power
button (Figure right) two (2) or three (3) times.
b) Does voltage drop to LESS THAN 0.5 volts DC WHILE THE BUTTON
IS PRESSED?
Yes Drops to LESS THAN 0.5 volts! The Power button is okay.
See procedure number P- 1.0.5 (page 690).
No Does NOT drop to less than 0.5 volts! THREE (3) possible bad
components: 1) Most likely, bad keypad (Figure right); 2) Bad UI-
MICS board; 3) Bad motherboard.
P- 1.0.5 POWER BUTTON OKAY / ISOLATE POWER LOGIC BOARD
a) Unplug the machine then plug it back in but DO NOT press the Power button yet!
b) Figure below, locate the Power Logic Board’s 20-pin X2 ribbon cable at the front, top edge of the board
nearest the screen.
c) Measure at the rear side of the X2 cable at pin 3 (bottom row, second pin from the rear of the machine).
TWO (2) possible scenarios:
1) IF (and ONLY if) MORE THAN 6.0 volts: See procedure number P- 1.0.6 (page 691).
2) IF LESS THAN 6.0 volts: Proceed to
page 692, procedure number P- 1.0.9.
Figure 123 – Power Logic Board / X2 pin 3
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