Hammond B-3, Owner'S Manual

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Step 1. Remove two(2) big screws, and the wood panel. (see above picture)
Step 2. Locate the adjustment hole behind the BASS knob as shown below.
(see left picture below)
Step 3. Insert the hex wrench and rotate slowly until the shifter cam hole is located.
Step 4. Turn the wrench clockwise slowly until turning pressure increases if the wrench
turns easily at first. After pressure increases, turn an additional 15 degrees.
Step 5. If turning pressure is high initially, then only turn the wrench 15 degrees and stop.
Step 6. Remove the wrench and check for key noise. If the noise is gone, the contact has
been cleaned successfully.
(see right picture above)
Step 1. Locate the upper manual adjustment hole and insert the hex wrench
until the shifter hole is located.
Step 2. Follow steps 3 to 5 above.
INSTRUCTION
FOR KEYBOARD CONTACT CLEANING FUNCTION (B-3mk2,C-3mk2)
PROCEDURE OVERVIEW
CLEANING INSRUCTIONS
Lower manual
big screws
Wood panel
for Lower manual
Upper manual
for Upper manual
Marking
Please keep this instruction with the attached hex wrench.
The B-3/C-3 utilizes multi-contact manuals to produce the drawbar and
key click sounds the same way as the original B-3. There are a total of
1220 gold-plated contacts in both manuals. After some extended period of time,
the contacts will get dirty and will need to be cleaned.
This condition can be recognized by an increase of key-click noise and
intermittent/scratchy sounds from the drawbars. After this condition occurs,
the following key-contact procedure needs to be followed.
B-3 KEY CONTACT CLEANING
Please refer to the picture below.
There are ten bus bars that cover the distance between key 1 and key 61.
One end of the bus bars are clamped in the Bus Bar Shifter Module.
The Hex wrench is inserted into the hex opening in the center of the module.
Rotating the Hex wrench one complete turn will shift the bus bars through
both the right and left limits.
15°
15°
INSTRUCTION (B-3mk2) 00457-40110 0810
Bus bar
Leaf contact
Bus bar shifter module
Hex wrench