Model 8640B TM 9-4935-601-14-7&P
SECTION V
ADJUSTMENTS
5-1. INTRODUCTION
5-2. This section describes adjustments required to
return the Model 8640B Signal Generator to peak
operating condition when repairs are required. Included
in this section are test setups, and check and adjustment
procedures. Removal and replacement procedures are
given on the alphabetic service sheets (after the
schematics in Section VIII). Adjustment location
photographs are given on the last foldout in Section VIII.
5-3. SAFETY CONSIDERATIONS
5-4. Although this instrument has been designed in
accordance with international safety standards, this
manual contains information and warnings which must
be followed to ensure safe operation and to retain the
instrument in a safe condition (see Sections II and III).
Service and adjustments should be performed only by
qualified service personnel.
WARNING
Any interruption of the protective
(grounding) conductor inside or outside
the instrument or disconnection of the
protective earth terminal is likely to
make the apparatus dangerous.
Intentional interruption is prohibited.
5-5. Any adjustment, maintenance, and repair of the
opened instrument under voltage should be avoided as
much as possible and, when inevitable, should be
carried out only by a skilled person who is aware of the
hazard involved. The opening of covers or removal of
parts, except those to which access can be gained by
hand, may expose live parts, and also accessible
terminals may be live.
5-6. Capacitors inside the instrument may still be
charged even if the instrument has been disconnected
from its source of supply.
5-7. Make sure that only fuses with the required rated
current and of the specified type (normal blow, time
delay, etc.) are used for replacement. The use of
repaired fuses and the short-circuiting of fuseholders
must be avoided.
5-8. Whenever it is likely that the protection has been
imparied, the instrument must be made inoperative and
be secured against any unintended operation.
5-9. TEST EQUIPMENT REQUIED
5-10. Tables 1-2 and 1-3 contain a list of test equipment
and test accessories required in the adjustment
procedures. In addition, the tables contain the required
minimum specifications and a suggested manufacturer's
model number.
5-11. Pozidriv Screwdrivers
5-12. Many screws in the instrument appear to be
Phillips, but are not. To avoid damage to the screw
slots, Pozidriv screwdrivers should be used.
5-13. Blade Tuning Tools
5-14. For adjustments requiring a non-metallic metal-
blade tuning tool, use the J.F.D. Model No. 5284 (HP
8710-1010). In situations not requiring non-metallic
tuning tools, an ordinary small screwdriver or other
suitable tool is sufficient. No matter what tool is used,
never try to force any adjustment control in the
generator. This is especially critical when tuning
variable slug-tuned inductors, and variable capacitors.
5-15. Service Aids
5-16. Spare Parts Kit. The HP 08640-60095 Spare
Parts Kit contains miscellaneous mechanical spare parts
for the generator such things as nuts, bolts, screws and
washers.
5-17. Extender Board. An extender board is supplied
with the generator that can be used to extend all circuit
plug-in boards (except the A10A2 RF Divider Assembly
and the A12 Rectifier Assembly). The RF Divider
Assembly is self-extending just remove the riser board
and insert the Divider Assembly into the riser's socket.
5-1
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