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ELECTROSTATIC DISCHARGE SENSITIVE (ESDS)
This unit contains ESDS devices. We recommend the following precautions when repairing,
replacing, or transporting ESDS devices:
• Perform work at an electrically grounded work station.
• Wear wrist straps that connect to the station or heel straps that connect to conductive floor
mats.
• Avoid touching the leads or contacts of ESDS devices or PC boards even if properly
grounded. Handle boards by the edges only.
• Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert unpro-
tected devices into materials such as plastic, polystyrene foam, clear plastic bags, bubble wrap
or plastic trays.
DEVICE HANDLING
CD-20 MANUAL REVISION OVERVIEW
This service manual contains information about changes to the CD-20 PCB assemblies. It also
includes the original service manual as well as the supplements (183884-S1, 183884-S2,
183884-S3) concerning the CD-20. The following PCB assemblies (as well as the original CD-
20 PCB) are covered by this service manual. PCB part number 199827 (has a slight change to
the AM circuit to enable the use of a new AM antenna), PCB part number 250736 (incorporates
a new FM section).
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