Keysight Technologies E8257D Service Manual page 43

Troubleshooting
Troubleshooting Assembly–Level Problems
Table 1-10 E8267D Power Supply vs. Assembly Matrix (3 of 5)
Motherboard Test Points:
A2DS1 Backlight
A3 Power Supply
A5 Sampler
A6 Frac N
A7 Reference
A8 Lowband Output
A9 YIG Driver
A10 ALC
A11 Mod Gen
A13 I/Q Multiplexer
A14 Baseband Generator
A18CPU
A21 Rear Panel
A23 Lowband Coupler/Det
A26 Microwave Interface
A27 40 GHz Doubler
A29 20 GHz Doubler
A30 20 GHz Mod Filter
A35 20 GHz I/Q Modulator
E8257D/67D, E8663D PSG Signal Generators Service Guide
LED LED
+3.4D +2.6VD
J236–A4–6, J238–A4–6,
C4–6, E4–6 B1–3, E4–6
J237–A4–6, J239–A4–6,
B1–3, B1–3
C4–6, D1–3
P111–60, 61, 62, P112–57, 58,
63, 125, 126, 59, 123, 124
127, 128
P122–60, 61, 62, P122–57, 58,
63, 125, 126, 59, 123, 124
127, 128
P132–60, 61, 62, P132–57, 58,
63, 125, 126, 5,
127, 128 123,124
P151–60, 61, 62, P151–57, 58,
63, 125, 126, 59, 123, 124
127, 128
P161–60, 61, 62, P161–57, 58,
63, 125, 126, 59, 123, 124
127, 128
P222–45, 46, 47,
48, 95, 96, 97,
98
P201–24
LED LED
–7 VDC –6 VDC
J233–A4–6, C4–6,
E4–6
P22–3, 18
P32–3, 18
P42–3, 18
P52–3, 18
P112–11, 12, 13, P112–19,
14, 38
a
44
P223–37 P223–17
P201–30, 33, 46
LED
–15 VDC –15 VAF
P12–1
J231–C4–6
,
E4–6
P22–2
P32–2
P42–2
P52–2
P112–4, 29
P122–3
P132–3
P152–3
P162–3
P223–3
P241–15,
16
J15–10
P201–11,
12
J36–4
J32–4
J31–4
b
J34–4
43