E8257D/67D, E8663D PSG Signal Generators Service Guide 37
Troubleshooting
Troubleshooting Assembly–Level Problems
Power Supply Troubleshooting
The power supply is a switching supply with automatic line–voltage and
frequency selection. Because of this, a switch is not required to set 115 VAC or
240 VAC operation. The input power line is fused, but the fuse is not
replaceable; if the fuse opens, you must replace the power supply.
Tables 1-5 through 1-7 list the motherboard test points (connector and pin
number) and power supply voltages for the E8257D. See Figure 1-2 on
page 46 for connector locations.
Tables 1-8 through 1-12 list the motherboard test points (connector and pin
number) and power supply voltages for the E8267D, beginning on page 1-41.
See Figure 1-3 on page 47 for connector locations.
For the E8267D, if the red PS–FAULT LED is off (see Figure 1-5), troubleshoot the
power supply.
After unplugging the instrument, wait 30 seconds to allow the supplies to
discharge before removing or installing an assembly.
Table 1-5 E8257D/E8663D Power Supply vs. Assembly Matrix (1 of 3)
Motherboard test points: +32 Vdc +15 Vdc +10 Vdc +8 Vdc +9 Vdc +5.2 Vdc
A1 Keyboard P13–12
A2 Display P11–44
A3 Power Supply P231–1,
41
P231–3, 4,
43, 44
P231–6, 7, 46, 47 P231–15, 16, 18,
19, 55, 56, 58, 59
A5 Sampler P22–7 P22–6, 21 P22–20, 5 P22–14, 29
A6 Frac–N P32–7 P32–6, 21 P32–20, 5 P32–14, 29
A7 Reference P42–7 P42–6, 21 P42–20, 5 P42–14, 29
A8 Output P52–7 P52–6, 21 P52–20, 5 P52–14, 29
A9 YIG Driver P112–6 P112–5, 30 P112–15, 16, 40 P112–17, 18, 42 P112–3, 28
A10 ALC P122–4 P122–28 P122–2, 27
A11 Mod Gen P132–4 P132–28 P132–2, 27
A12 Pulse Modulator J14–10 J14–9
A18 CPU P223–4 P223–23 P223–39 P223–40 P223–18 P223–2, 22
A21 Rear Panel P241–13,
14
P241–17, 18 P241–11, 12
A26 Microwave Interface P201–1 P201–2, 3,
4
P201–5, 6, 7, 8, 9,
10
P201–29 P201–13, 14, 15,
16, 17, 18
A23 Lowband Coupler/Detector J15–8
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