Datron TW7000 Spécifications télécharger pdf (Page 53)

Servicing 4-1

SECTION 4: SERVICING

General

Detailed servicing information is beyond the scope of this manual and

only experienced personnel should make adjustments or attempt any

serious service work. Reference to the TW7000 HF Transceiver Tech-

nical Manual (TW7000-MS) is essential.

The TW7000 is of modular construction. If spare boards are available,

non-technical personnel are able to repair most faults in the field. It is

strongly recommended that non-technical personnel receive instruc-

tion from experienced technicians in the replacement of boards.

The TW7000 has a BITE system that aids in troubleshooting down to

the individual board level. When a fault occurs, a BITE fault message

displays indicating the specific board affected. The BITE runs auto-

matically on power up or whenever Alpha 20 is entered.

Routine Maintenance

The TW7000 normally requires no periodic maintenance except to

check the calibration of the master oscillator. It is often convenient to

program an unused channel to a known frequency standard such as

WWV (radiates 10,000W on 5, 10, and 15 MHz). This enables regular

checks of the frequency calibration.

The exterior of the TW7000 should be kept clean by wiping it with a

damp cloth and polishing it with a soft dry cloth. All knobs should be

secure and connectors tight. When the TW7000 is opened, coaxial

connectors should be tight and board connectors firmly in place. Any

dirt or dust should be removed using compressed air.

Board Access and Replacement

The top and bottom covers are each retained by six screws. After

removal of the retaining screws, the covers can be lifted off the

TW7000. For board locations, refer to the Board Locations section on

page 4-2.

CAUTION: When the transmitter is operating, high RF voltages

are present on the power amplifier and filter boards. Use caution

as these RF voltages can cause burns.

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Datron TW7000 Spécifications Page 53