2008T Troubleshooting Guide
P/N 490292 Rev. A
HEATER RELAY- 2.0.0 ISOLATE DIODE 17 (D17)
A bad diode 17 (D17) destroys Power Logic Boards. See parts a THROUGH h below:
a) Turn the power off and unplug the machine!
Caution! Electrocution hazard if not unplugged!
b) Per Figure 111 below, open the power supply to see the component side of the Power Control board.
c) The twenty (20) and nine (9) pin* cables MUST be unplugged! *BEFORE unplugging the nine pin cable
NOTE its polarity (i.e. orange wire on the right)!
Figure 111 – Power Control Board (Diode 17)
d) Set your volt meter to RESISTANCE (Ω)!
g) Per Figure 111, check diode 17 (D17) by placing one
meter lead on one side of it and the other lead on the
other side.
h) Figure right, reading the meter’s numeric AND units display,
TWO (2) possible scenarios:
1) IF (and ONLY if) between 900 and 1500 Ω! (0.900 and 1.5 KΩ): Diode 17 is good!
Proceed to page 626, procedure number HEATER RELAY- 2.0.1.
2) IF less than 900 Ω (0.900 KΩ) OR more than 1500 Ω (1.5 KΩ): Diode 17 is bad!
Perform parts a THROUGH e below:
a) Replace
BOTH the Power Control AND Power Logic* boards with known good! *To LOCATE
the board refer to Figure 4A AND NOTE A (page 10).
Parts b through e next page
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