E8257D/67D, E8663D PSG Signal Generators Service Guide 45
Troubleshooting
Troubleshooting Assembly–Level Problems
B1 Fan Fan+
P252–2,
P251–2
Fan–
P252–1,
P251–1
a. Voltage regulator on motherboard
b. Originates on YTO Driver
c. Originates on Microwave Interface
Table 1-11 E8267D Power Supply vs. Assembly Matrix (4 of 5)
Motherboard Test Points:
LED
–5.2V
LED
–5.2 V2
a
+1.8 VDC
+12 VDC
LED
+15 VSTBY
Fan Voltage
Table 1-12 E8267D Power Supply vs. Assembly Matrix (5 of 5)
Motherboard Test Points:
LED
+1.95VD1
a
LED
+1.8VD_1
a
Baseband Generator P161–52, 118 P161–55, 56, 120–122
a. Voltage regulator on motherboard
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