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8. Remove the following cables from the main assembly board:
9
10 .
11.
12.
13.
14.
l
Disk drive cable.
l
Oscilloscope board cable.
l
Power supply cable.
l
CRT sweep cable.
l
HP-IB cable.
Disconnect the keyboard assembly ribbon cable from the Main Assembly.
Carefully place the instrument on its side.
From the bottom of the instrument, remove the eight screws that secure the
Main Assembly to the instrument cabinet.
Set the instrument in the normal position.
Slide the main assembly out of the rear of the instrument cabinet.
Replace the Main Assembly by reversing this procedure.
dC
I
Note d
When you reinstall the top cover, insert the four screws on the sides of the cover
f
ust while making sure the cover fits into the grooves of the instrument cabinet.
Then insert the six screws in the top of the cover.
Removal and
Replacement
of
the CRT
Monitor
Assembly
The sweep board, CRT, and CRT yoke are all parts of one HP part number. They
have been adjusted as a unit and should be replaced as a unit, rather than
individually.
Do not remove the yoke from the CRT.
When necessary, refer to other removal procedures.
1.
Turn off the instrument and disconnect the power cable.
2. Remove the six screws from the top and the two screws from each side of the
instrument's top cover.
3.
Lift off the top cover.
4. Remove the Rear Panel, Power Supply, and Main Assembly.
Discharge the post accelerator lead to the CRT monitoring
band only.
Components will be damaged if the post accelerator is discharged to other areas.
5. Connect a jumper lead between the mounting band of the CRT and the shaft
of a screwdriver.
6. Discharge the CRT by placing the grounded screwdriver under the
protective rubber cap of the post accelerator lead and momentarily
touching
the screwdriver to the metal clip of the post accelerator.
The CRT may charge up by itself even while disconnected.
Discharge the
CRT
before handling.
Use a jumper lead to short the CRT post accelerator terminal to
the
CRT
mounting band.
HP 1652B/1653B
Assembly
Removal
and Replacement
Service Manual
6D-11
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