E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
1-20
A11 Mod Gen P132–1, 26
A13 I/Q Multiplexer P152–1 P152–26
A14 Baseband Generator P162–1 P162–26
A18 CPU P223–1 P223–21
A21 Rear Panel P241–9, 10 P241–5, 6, 7, 8
A26 Microwave Interface P201–31, 32
A27 40 GHz Doubler J36–8
A29 20 GHz Doubler
J32–8
J32–1, 3
c
A30 20 GHz Mod Filter
J31–8
J31–1, 3
c
A35 20 GHz I/Q Modulator
J34–9
c
A38 LB Switch Filter
P142–26 P141–51, 55,
56, 117, 120,
121
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 1-12 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
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
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