HP (Hewlett-Packard) HP 85660B ユーザーズマニュアル
13. Disconnect cable between front-panel IF OUTPUT connector and
ACLU at the
ACLU.
14. Disconnect cable between front-panel IF INPUT connector and
LPF at the LPF.
15. Disconnect wire harness plug from motherboard and position wire harness such that the
“totem pole” assembly can be removed.
16. Remove two screws attaching the “totem pole” assembly to the motherboard and two
screws
attaching the “totem pole” assembly to the attenuator bracket.
17. Remove the “totem pole” assembly from RF Module.
18.
OR
can now be replaced by disconnecting attached cables.
Installation
19. Replace
or
in the “totem pole” assembly and reconnect cables.
20. Place the “totem pole” assembly in the RF Module.
21. Replace two screws to attach the “totem pole” assembly to the motherboard and two
screws
to attach the “totem pole” assembly to the attenuator bracket.
Caution
The YIG-Tuned Mixer (YTX) contains an extremely small and sensitive
diode. A reverse voltage in excess of 3 volts may damage it. It is connected
directly to the center conductor of the LO/IF connector, and is especially
susceptible to blowout from electrostatic discharge. Before connecting any
cable to this connector, first discharge the cable by connecting the center
conductor to ground. It is recommended that the other end of the cable be
connected first. Once the cable is properly installed (from the YTX to the
diode. A reverse voltage in excess of 3 volts may damage it. It is connected
directly to the center conductor of the LO/IF connector, and is especially
susceptible to blowout from electrostatic discharge. Before connecting any
cable to this connector, first discharge the cable by connecting the center
conductor to ground. It is recommended that the other end of the cable be
connected first. Once the cable is properly installed (from the YTX to the
ACLU), the BIAS pin of the ACLU is connected to the YTX diode and must
also be treated with caution. A general rule is to connect all devices to ground
before connecting them to the BIAS pin on the ACLU.
also be treated with caution. A general rule is to connect all devices to ground
before connecting them to the BIAS pin on the ACLU.
22. Reconnect cable to
YTX.
23. Reconnect cable to
RF Switch.
24. Reconnect cable from front-panel
LO OUTPUT to
ACLU.
25. Reconnect cable from front-panel IF OUTPUT to
ACLU.
26. Reconnect cable from front-panel IF INPUT to
LPF.
27. Reconnect cable
between All YTO Loop and
ACLU.
28. Reconnect 1 (brown) cable to and converter
OUT.
29. Remove three screws from
ACLU cover plate one at a time replacing cable
clamps then replacing screws.
A6 11