HP 8753D Option 011 Service Manual page 276

Node 30 FN VCO Det (A 4 VCO detector)
Perform step A14, above, and then press MEAS
SCALE REF 50 k/m .
5 5 5
ee whether the FN VCO is oscillating. The trace should resemble Figure 10-16.
Figure NODE30 here.
Node 3 Count Gate (analog bus counter gate)
Perform step A14, above, and then press MEAS
You should see a at line at +5 V. The counter gate activity occurs during bandswitches, and
therefore is not visible on the analog bus. To view the bandswitch activity, look at this node
on an oscilloscope, using
Menu heading.
PEEK/POKE Menu
To access this menu, press SYSTEM
PEEK/POKE
Caution
The PEEK/POKE capability is intended for service use only.
PEEK/POKE ADDRESS
(PEEL[D])
(PEEK)
PEEK
(POKE[D])
POKE
RAFT
3/21/106 15:14
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ANALOG IN 30
5
Figure 10-16. Analog Bus Node 30
ANALOG IN 31
5
. Refer to
AUX OU ON AUX OU on OFF
SERVICE MENU PEEK/POKE
5
Accesses di erent memory locations to view or change the
contents. The keys are described below.
Accesses any memory address and shows it in the active entry area
of the display. Use the front panel knob, entry keys, or step keys
to enter the memory address of interest.
Displays the data at the accessed memory address.
Allows you to change the data at the memory address accessed by
the
PEEK/POKE ADDRESS
keys, or step keys to change the data. The A9CC jumper must be
in the \ALTER" position in order to poke.
Service Key Menus and Error Messages 10-37
x1
RESOLU ION [HIGH]
5 5
x1 SCALE REF
5 5
under the Analog Bus
.
softkey. Use the front panel knob, entry
.
2 x1
5 5 5