5-1
Chapter 5
Troubleshooting & Maintenance
Introduction
Surface-Mount Devices
The removal and replacement of surface-mount devices requires training and proper
equipment. If you do not have the training or equipment to remove and replace surface-
mount devices, contact the Service Department to order a replacement PCB. International
service technicians should contact their appropriate Young Chang Distributor.
Cables, Connectors
Most of the cables with connectors are keyed, and therefore cannot be reversed. If a cable’s
connector is not keyed, the disassembly instructions will caution you.
Throughout the top and bottom enclosures some cable assemblies are bundled together and
secured to the enclosure(s) with mounted head cable wraps. These cable wraps have exible
tabs and do not need to be cut; just unwrap the exible tab to release the bundled cables.
Unless otherwise noted, you do not need to unscrew the cable wrap from its position.
Standard plastic tie wraps are also used to bundle cables. Unless the service you are
performing requires it, do not cut the tie wraps. Should you need to do so, be sure to install
new tie wraps.
In some cases, tape fastens cables to PCBs or the enclosure. When disconnecting cable(s),
always peel back the tape from one side so that the tape remains properly positioned.
Required Tools and Materials
• No. 1 Phillips head screwdriver
• No. 2 Phillips head screwdriver
• 7/16” nut driver
• needle-nose pliers
• Small blunt-end tool (Q-Tip, toothpick, etc.)
• Foam or soft surface to protect the front panel, the keyboard and other delicate pieces
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