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PS-900 SPECIFICATIONS POWER R E Q U I R E M E N T S 110-120 V A C / 2 2 0 V A C , 4 amps/2 amps, 50/60 Hz. OUTPUT Rec. Volt Trans. Cur. Rec. Cur. Trans. Volt —...
The PS-900 is equipped with a cabinet which matches the T S - 9 0 0 for table mounting, however, A C switching is controlled by the transceiver so that the power supply can be remotely mounted.
Connect a wire from a good earth ground to the G N D lug on the back of the PS-900. If a good earth ground is not available and the PS-900 is operated from an approved three-wire electrical system in the United States, the third...
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POWER C A B L E Connect the interconnecting power cord between the PS-900 and the TS-900. S P E A K E R Connect the interconnecting speaker cord between the PS-900 and the TS-900. POWER C O R D Make sure that the TS-900's POWER switch is turned to O F F .
S P E A K E R JACK (3 on Figure 2) This jack connects the PS-900's speaker to the S P E A K E R jack of the TS-900 to monitor the A F output of the TS-900's receiver. A n appropriate cord is supplied with the power supply.
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The fuse is a 3 A G , 8 amp (6 amp for 220 V A C operation) fuse. Use of any higher amperage fuse can cause extensive power supply damage. F I G U R E 2. PS-900 Operating Controls...
Failure to place the switch to the proper voltage can cause damage to the power supply. Set the voltage selector switch for the proper line voltage. Turn the PS-900 on by pushing the P O W E R switch of the TS-900 on. The pilot light should glow, indicating the transceiver and power supply are turned on.
SECTION 5. CIRCUIT DESCRIPTION 5.1 AC LINE There i j a dual pi filter installed in the A C fine to prevent radiation of radio waves from the A C power line. 5.2 800V LINE (Pin 11) The 800 V D C high voltage is obtained through a voltage doubling rectifier. T w o silicon diodes are used in series with each rectifier element to obtain the necessary reverse voltage rating.
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13.5 V LINE (Pins 6 and 8) This line is the A C supply for the tube filaments and the pilot lights. 5.7 - 1 7 V LINE (Pin 12) The - 1 7 volts is rectified from the 13.5 V A C line. The voltage is used in the control circuit.
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F I G U R E 3. Top Chassis Parts Diagram F I G U R E 4. Bottom Chassis Parts Diagram.
SECTION 6. MAINTENANCE G E N E R A L The voltages from the power supply are not adjustable. T o remove the case for service, remove the two screws from the right and left side of the case. Also remove the four screws holding the case to the chassis. Then slide the case from the power supply.
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