User Manual

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ST-1808-28 Tunnel Service Manual

TROUBLESHOOTING

The following troubleshooting section is provided to aid in

determining the source of any operation difficulties that may develop.

In performing tests and checks that follow, carefully inspect for any

loose components, broken or loose wires, poor electrical connections,

etc., while testing the various switches, controls, relays,

transformers, etc. For checking electrical problems, use a voltage

meter.

Note: While troubleshooting, use caution to avoid danger

of electrical shock. When power is not required for checking for the

presence of value of voltages used, always have it disconnected.

Refer to electrical components placement sheet and

electrical schematic diagrams to assist in all troubleshooting efforts.

DISCONNECT ALL POWER BEFORE MAKING ANY REPAIRS.

REFER TO ELECTRICAL BOARD LAYOUT AND

ELECTRICAL SCHEMATIC (Page 51)

FOR LOCATION OF ELECTRICAL COMPONENTS