Keysight Technologies E8257D Service Manual page 39

Troubleshooting
Troubleshooting Assembly–Level Problems
Table 1-6 E8257D/E8663D Power Supply vs. Assembly Matrix (2 of 3) (Continued)
Motherboard test points:
AT1 Attenuator
Table 1-7 E8257D/E8663D Power Supply vs. Assembly Matrix (3 of 3)
Motherboard
test points: –15 Vdc
A2 Display
A3 Power Supply P231–12,
13, 52, 53
A5 Sampler P22–2, 17
A6 Frac–N P32–2, 17
A7 Reference P42–2, 17
A8 Output P52–2, 17
A9 YIG Driver P112–4,
29
A10 ALC P122–3
A11 Mod Gen P132–3
A12 Pulse Modulator J14–7
A18 CPU P223–3
A21 Rear Panel P241–15,
16
A23 Lowband J15–10
Coupler/Detector
A26 Microwave Interface P201–11,
12
A27 40 GHz Doubler J33–4
(E8257D only)
A29 20 GHz Doubler J32–4
A30 Mod Filter J31–4
A36 Quadraplier J34–3
(E8257D only)
E8257D/67D, E8663D PSG Signal Generators Service Guide
+5.2 Digital +3.4 Digital
J13–2
–5.2 Vdc –3 Vdc +3.5 Vdc
P22–4,
19
P32–4,
19
P42–4,
19
P52–4,
19
P112–1,
2, 26, 27
P122–1,
26
P132–1,
26
P201–31,
32
P223–1
P241–9,
10
P201–31,
32
J33–8
J32–8
J31–8
J34–17 J34–11, 12,
13, 14, 15
+2.6 Vdc –7 Vdc
+6.5 Vdc +12 Vdc
J32–1, 3
J31–1, 3
J34–8, 9
–6 Vdc +1.8 Vdc
Fan
+15 Vdc stby Vol tage
P11–43
P231–80
P223–21
P241–5, 6, 7,
8
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