Product manual

Cheetah 73FC Product Manual, Rev. C 25
Table 2: PCBA and HDA temperatures
Notes.
[1] Section 8.3.1 describes the air-flow patterns used when generating the 1,200,000 hours MTBF guide-
lines in column 2. Air flow was opposite that shown in Section 8.3.1. Local air velocity was 0.914 m/sec
(180 lfpm). Inlet air temperature to the drive was 77°F (25°C), plus 9°F (5°C) temperature rise in the
test enclosure (86°F/30°C ambient local to the drive).
[2] Measure HDA temp at point labeled “HDA” on Figure 6.
[3] PCB mounted integrated circuit case.
b. Non-operating
–40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This
specification assumes that the drive is packaged in the shipping container designed by Seagate for use with
drive.
Figure 6. Locations of PCBA components listed in Table 2
Items in
Figure 6
Maximum allowable
case temperature (
°
C)
operating
Maximum allowable
case [3] temperatures (°C)
to meet MTBF spec.
HDA [2] 60 45
1 (Processor) 77 57
2 (A/D Demod) 93 73
3 (FC Interface) 100 80
4 (Voyager) 86 66
3
2
14
HDA Temp.
Check Point
.5"
1.0"