Thermo IEC Micromax 3590, Service Manual, Page: 44 / 84

Test
Use this procedure to verify operation of the braking
system:
WARNING: This procedure requires operation of the unit with
power applied and the cabinet removed. Use caution
to avoid electric shock. See Section 7.1, Warnings and
Cautions.
1.
2.
3.
4.
5.
6.
7.
8.
Remove the lid and place the cabinet on its side,
leaving the display board connected.
Locate TP1 (GND) and J11, pin 3 (YEL) on the Power
PCB.
Verify DC braking voltage across these locations.
Expected measurement should be approximately 170
VDC.
Plug the unit in and verify that a properly loaded rotor is
installed.
Select an appropriate speed and time, and start a run.
During a run, this voltage should drop slightly (3 - 10
VDC).
If voltage is not present, verify resistance of the brake
resistor at J11 pins 1 (RED) and 3 (YEL). The
expected value is approximately 50
Ω
.
If the resistor is good, replace the Power PC board.
Micromax Series
42
Service Manual