HP 11793A Operating And Service Manual page 43

Microwave Converter Model 11793A
12.
13.
14.
Remove S2 from MP14 module base by removing the two corner screws.
Unsolder the three control wires (1,
2, 5)
from S2.
Remove the Spira Shield (RF "EMI" gasket situated in the module base lip) only if damaged, or
replacement
of
MP14 module base.
40. RF Module Disassembly Procedure for Option 001, 011, & 021 Instruments
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
NOTE
When referring to switch ports: port
# I
is the f a r left ( S M A )
connector, port
# 2
is the second
S M A
connector, etc., when holding
the switch (label
u p )
with the SMA connectors facing you.
Disconnect W 1 2 (gray ribbon cable) at A 1 J 1.
Remove MP16 module cover by removing the 10 cover screws.
Disconnect cables W7 and W8 using a 5/16 open-end wrench: W7 from U3 mixer and FL1
Filter, W8 from U2 IF Amp and S2 Switch, port #4.
Unsolder the orange and white/orange wires (3, 93) from U2. Unsolder the gray and
white/orange wires
(8, 9 3)
from U 1.
Remove U2 and FL1 from MP16 by removing the two screws securing U2, then loosen the filter
clamp screw and slide the assembly out.
Disconnect W9 from S1, port #1 and U1.
Disconnect the LO input semi-rigid coax cable (W4 in Option 001; W14 in Option 01 1; or W18
in Option 021) from S1, port #2, being careful not to bend, crimp, or kink the cable. The radio
frequency interference (RFI) shielding grommet can be removed by slipping the grommet off of
the cable via the cable access slit.
Disconnect W6 from S1, port #3 and
U3.
Disconnect W5 from S l , port #4 and U1 (power terminal side).
Unscrew the two Torxhead screws that secure the UlMP17 Amplifier mounting bracket to
MP 14 module base. The U 1 amplifier and bracket can then be removed.
Unscrew the two Torxhead screws that secure the MP18 mixer mounting bracket to MP14
module base.
NOTE
Remember the order in which the stiffener bar and mixer bracket are
assembled. The stiffener bar and mixer bracket assembly order is
different between each brand
o f
mixer used.
12. Disconnect U 3 from the Attenuator (AT 1). U3 Mixer and bracket can then be disassembled.
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