Maintenance Manual LBI-38550D Site Equipment Power Supply 19A149978P1 - 120 VOLT/60 Hz 19A149978P2 - 230 VOLT/50 Hz CAUTION THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL ONLY. TO AVOID ELECTRIC SHOCK DO NOT PERFORM ANY SERVICING OTHER THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO SO. REFER ALL SERVICING TO QUALIFIED SERVICE PERSONNEL. WARNING: TO PREVENT FIRE OR ELECTRIC SHOCK HAZARD. DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE.
LBI-38550D TABLE OF CONTENTS Page SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 IMPORTANT SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 CIRCUIT ANALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 MAINTENANCE . . .
LBI-38550D SPECIFICATIONS* OUTPUT VOLTAGE Transmit and Receive Simultaneously 13.2 Vdc ±0.6 Vdc @ 29 Amps (F801B) 13.2 Vdc ±0.6 Vdc @ 4 Amps (J801) Receive only < 16.0 Vdc @ 3 Amps (J801) Transmit only (For 225 watt PA option) 13.2 Vdc ±0.6 Vdc @ 33 Amps (F801B) INPUT VOLTAGE 121 Vac ±20% (60 Hz version) 230 Vac ±15% (50 Hz version) INPUT FREQUENCY 60 Hz ±2 Hz (60 Hz version) 50 Hz ±2 Hz (50 Hz version) Note: For every + 1.
LBI-38550D IMPORTANT SAFETY INFORMATION 1. SAVE THIS MANUAL - It contains important safety and operating instructions. 2. Before using the product, please follow and adhere to all warnings, safety and operating instructions located on the product and in the manual. 3. DO NOT expose product to rain, snow or other type of moisture. 4. Care should be taken so objects do not fall or liquids do not spill into the product. 5. DO NOT expose product to extreme temperatures. 6.
LBI-38550D Figure 1 - 60 Hz Power Supply (19A149978P1, Rev. B) Figure 2 - 50 Hz Power Supply (19A149978P2, Rev.
LBI-38550D DESCRIPTION The M/A-COM MASTR II Site Equipment Power Supply provides up to 435 watts to power the site equipment receiver, systems circuitry, and transmitter. The power supply normally will be used to provide power to a MASTR II Site Equipment with a maximum of 29 Amps to the power amplifier and 4 Amps for the Receiver/systems circuitry. The supply can also optionally be used to power a 225 watt power amplifier.
LBI-38550D load to prevent the output voltage from ever rising above 18 volts under any load condition. Under normal conditions jumper P802 is installed connecting the bleeder resistor (SW GND) to A-. In 60 Hz models (Rev. A and earlier), prior to Rev. B, this is done using a ground strap externally connected between F801B-2 and F801B-3. When the emergency power option is used, the jumper or ground strap is removed. This allows the relay K3 in charger 344A3168 to ground or open the bleeder resistor.
LBI-38550D Figure 3 - 60 Hz Power Supply (19A149978P1, Rev. B) Figure 4 - 50 Hz Power Supply (19A149978P2, Rev.
LBI-38550D FUSE REPLACEMENT To replace a defective fuse, perform the following procedure WARNING To avoid electrical To avoid possible electric shock, DO NOT operate this power supply with the fuse cover removed. 1. Place ON/OFF switch to the OFF position. 2. For fuses F1 (F1 & F4 on 978P2) or F3, remove cap from fuse holder and replace fuse with a fuse of the same type and rating. 3. For fuse F2, remove two screws holding fuse cover to front panel.
LBI-38550D TROUBLESHOOTING PROCEDURE Table 2 - 50 Hz Power Supply 19A149978P2 SYMPTOM No output voltage at J801 PROCEDURE Check the following: 1. Open F1, F3, F4 or S1 2. AC voltage on W801 3. Open D1, D3 or D3 No output voltage at F801B Check the following: 1. Open F1, F2, F4 or S1 2. AC voltage on W801 3. Open D1, D2 or D3 Low output voltage on F801B or J801. Check the following: 0 < Vo < 12.5 Vdc 1.
TROUBLESHOOTING PROCEDURE LBI-38550D COMPONENT SIDE (33014904, Rev. F) (33014900, Sh. 1, Rev. F) SOLDER SIDE (33014904, Rev. F) (33014900, Sh. 2, Rev.
LBI-38550D ASSEMBLY DIAGRAM Rev. 0 & Rev. A (Made from 289PS1, Rev. A) 60 HZ POWER SUPPLY 19A149978P1 12 Rev. B (Made from 289PS11, Sh. 2, Rev.
SCHEMATIC DIAGRAM LBI-38550D 60 HZ POWER SUPPLY 19A149978P1, Rev. 0 & Rev.
LBI-38550D 60 HZ POWER SUPPLY 19A149978P1, Rev. 0 & Rev.
PARTS LIST LBI-38550D 15
LBI-38550D ASSEMBLY DIAGRAM (Made from 289PS2, Sh. 2, Rev.
SCHEMATIC DIAGRAM LBI-38550D 50 HZ POWER SUPPLY 19A149978P2 (289PS2, Sh. 1, Rev.
LBI-38550D M/A-COM Wireless Systems 3315 Old Forest Road Lynchburg, Virginia 24501 (Outside USA, 434-385-2400) Toll Free 800-528-7711 www.macom-wireless.com PARTS LIST Printed in U.S.A.
