Hammond xb 2 xb 2n service manual

Page 2

Scan by Manual Manor
http://www.markglinsky.comlManualManor.html

SAFETY NOTICE
Great care has been taken in the design and manufacture at this product to assure that no shock hazard
exists on any exposed metal parts. Internal service operations can expose the technician to hazardous line
voltages and accidentally cause these voltages to appear on exposed metal parts during repair or
reassembly ol product components. To prevent this. work on these products should only be perlormed by
those who are thoroughly familiar with the precautions necessary when working on this type ofequipment.

To protect the user. it is required that all enclosure parts and safety Interlocks be restored to thetr
original condition and the followlng tests be performed before returning the product to the owner
after any service operation. .

Plug the AC tine cord directly into a line voltage AC receptacle (do not use an isolation translormer for this
test) and turn the product on. Connect the network (as shown below) in series with all exposed metal parts
and a known earth ground such as a water pipe or conduit. Use an AC VOM of 5.000 ohms per volt or
higher sensitivity to measure the voltage drop across the network. Move the network connection to each
exposed metal part (metal chassis, screw heads, knobs and control shafts. escutcheon. etc.) and measure
the voltage drop across the network. Reverse the line plug and repeat the measurements. Any reading of 4
volts HMS or more is excessive and indicates a potential shock hazard which must be corrected before
returning the product to the user.

0 VON 0
AC SCALE

10K
2w

WV

II
II
.01 MF
CERAMIC RF
BYPASS CAP
TEST CLIPS
TEST
PROBE

CONNECTED TO KNOWN
EARTH GROUND

T0 EXlOSED METAL PARTS

CAUTION
Danger of explosion if battery is incorrect-
ly replaced. Replace only with the some or
equivalent type recommended by the equipment
manufacturer. Discard used batteries accord-
ing to manufacturer's instructions.