2-27. LUBRICATION
2-28. APPROVED LUBRICANTS. The following listed lubricating material is required to
service the Model C-3 Hammond Organ: Spec MIL-L-644
2-29. CONSOLE. Some moving parts receive lubrication by capillary action via cotton
threads connected to the central oil trough. Oil is fed to this trough from two oil
cups (See picture on page 1 of Main Generator section). To pin access to these oil
cups, remove the rear dust panel by unscrewing the two thumb screw bolts. Every year
fill the oil cups three-quarters full with oil, Spec MIL-L-644. (The oil level will
slowly drop; however, do not continue adding oil.)
2-30. INSPECTING AND TESTING REMOVED PARTS.
2-31. VACUUM TUBES.
2-32. INSPECTING. Check each tube for tight mounting in its socket. Inspect visually
for mechanical and other obvious defects. Discard defective tubes. Be certain that
each tube is of the type specified.
NOTE
Return each tube, if found to be good, to the socket from which it was removed.
Distortion will result if replaced tubes are mismatched.
2-33. TESTING. Use tube checker in accordance with the instructions furnished. Do
not neglect the short circuiting test.
2-34. CABLES AND CONNECTORS.
2-35. INSPECTING. Inspect cables for cracked, frayed, or deteriorated insulation at
the connecting or supporting points. Inspect the cables or connectors for improper
placement which puts them under strain. Watch for kinks and improper supports.
Inspect all connectors for dirt, corrosion, and damaged or loose contacts or
terminals. To prevent possible short circuits, be sure no corrosion or dirt remains
between the contacts.
2-36. TESTING. Use an ohmmeter and make continuity checks on the cables. Test for
grounding and for shorting between points; if defects are discovered in connectors,
replace the connectors. Test the voice coils. Reading of approximately 8 ohms should
be obtained.
TROUBLE LOCATION
3-1. TROUBLESHOOTING.
3-2. GENERAL. When troubleshooting, use all of the aids included in this manual:
block diagrams (see General Descriptions), overall schematics, amplifier schematics
(see Wiring and Schematic Diagrams), illustrations of components (throughout
manual), and the trouble shooting chart (reference paragraph 3-28). Before starting
an elaborate test procedure, make a thorough visual inspection to locate the fault.
Check for defective wiring, drops of solder, faulty connections, open resistors
and capacitors, jammed tone wheels, etc.
4
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