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Model 150A400

Manual Text

4-3

REV B

4.3.1.2

Check the

FUNCTION

switch on the unit’s front panel; it must be set to the

LOCAL

position in order to operate the front panel

POWER

switch. Check the circuit breaker on

the unit’s rear panel; it must be set to the “

” (“ON”) position.

4.3.1.3

4.3.1.3 If the

“Power On”

indication is not displayed and the cooling fan (Blower B1) is

not running, check to see that the unit is plugged into a live outlet and that the AC line
cord is plugged securely into the unit.

4.3.1.4

Check the output voltages from PS3; these voltages should be as follows:

PS3 J2, Pin 1

+12.0 ± 0.3VDC

PS3 J2, Pin 2

+ 5.0 ± 0.2VDC

PS3 J2, Pin 6

-12.0 ± 0.3VDC

If output voltages are not present on PS3, check the AC input to PS3.

4.3.1.5

Check the voltages to the A4 Operate/Control Board on connector A4 J3; the voltages

should be as follows:

A4 J3, Pin 16

-12.0

0.3VDC

A4 J3, Pin 29

+ 5.0

0.2VDC

A4 J3, Pin 31

+12.0

0.3VDC

4.3.1.6

Check the voltage on A4 J3, Pin 3; it should be

≥

4V when the

POWER

switch (S1) is in

the normal position and

0.1V when S1 is depressed. S1 is normally open; it is closed only

when it is depressed. The amplifier should change state every time the

POWER

switch is

depressed.

4.3.1.7

If all voltages are correct and the unit still does not operate, contact Amplifier Research to

arrange for repair or replacement of the A4 Operate/Control Board.

4.3.2 The Unit Cannot be Operated Remotely

4.3.2.1

Verify that the front panel

FUNCTION

switch is set to the

REMOTE

position.

4.3.2.2

Verify that the unit operates locally by resetting the

FUNCTION

switch to the

LOCAL

position; if the unit does not operate locally, see subsection

4.3.1

of this manual.

4.3.2.3

Check the position of the

“ADDRESS”

switch assembly (SW1) on the A4

Operate/Control Board; this assembly can be accessed through the unit’s rear panel. Check
to see that these switches are properly set for either RS-232 or IEEE-488 operation, as
desired.
(See subsection

2.2.2

of this manual for the proper

“ADDRESS”

switch settings.)

(

Note:

Address switches are only read at unit power-up; remove and re-apply AC power

(i.e., reset the circuit breaker) after changes are made.)

Содержание 150A400

Страница 1: ...ier Section 3 1 3 4 Power Supply 3 2 3 5 Fault Board 3 2 3 6 A3 Gain Control 3 2 SECTION IV MAINTENANCE 4 1 General Maintenance Information 4 1 4 2 Disassembly Procedures 4 1 4 3 Troubleshooting 4 2 4 3 1 Front Panel Vacuum Fluorescent Display VFD Doesn t Indicate Power On 4 2 4 3 2 Unit Cannot be Operated Remotely 4 3 4 3 3 Thermal Fault 4 3 4 3 4 Interlock Fault 4 4 4 3 5 Voltage Amplifier Fault...

Страница 2: ... Material BOMs 5 3 APPENDIX A STANDARD ABBREVIATIONS FOR MANUFACTURERS A 1 SECTION VI RECOMMENDED SPARE PARTS 6 1 Level of Maintenance 6 1 WARRANTIES LIMITATION OF LIABILITIES LIST OF FIGURES 2 1 Model150A400 Front Panel 2 2 2 2 Model150A400 Rear Panel 2 2 LIST OF TABLES 2 1 IEEE 488 Device Address Selection 2 5 2 2 Remote Error Codes Messages 2 6 2 3 RS 232 Connector Pin Outs 2 7 ...

Страница 3: ...frequency multipliers and higher power amplifiers and use as an RF energy source for Magnetic Resonance Imaging MRI studies The Model150A400 can be operated locally by using the unit s front panel controls or remotely by using its built in IEEE 488 or RS 232 interfaces 1 2 POWERSUPPLIES The 150A400 contains four switching power supplies The input voltage range to these supplies is 90 132 VAC and 1...

Страница 4: ...MAGE RF INPUT POWER UP TO TWENTY 20 TIMES ITS RATED INPUT OF 1mW HOWEVER SIGNAL LEVELS HIGHER THAN 20mW OR TRANSIENTS WITH HIGH PEAK VOLTAGES CAN DAMAGE THE AMPLIFIER ALSO ACCIDENTAL CONNECTION OF THE OUTPUT TO ITS INPUT CAUSES OSCILLATIONS WHICH WILL PERMANENTLY DAMAGE THE INPUT TRANSISTORS WHILE THE MODEL 150A400 WILL OPERATE INTO ANY LOAD IMPEDANCE THE AMPLIFIER MAY DRAW EXCESSIVE CURRENT AND S...

Страница 5: ...scent display VFD should read POWER ON STATUS OK when power is applied NOTE The amplifier changes state each time the POWER switch is depressed if the unit is on when the POWER switch is depressed it will turn off if the unit is off when the POWER switch is depressed it will turn on 5 In the event of a fault press the FAULT RESET switch if the fault does not clear refer to subsection 4 3 Troublesh...

Страница 6: ...l be active 2 2 2 4 Interface Set up Switches 1 5 of the rear panel DIP switch are used to select either the RS 232 communication BAUD rate or the IEEE 488 device address depending upon which interface is active Note These switches are only read at device power up In order for changes made in these switch settings to take place AC power must be removed and then re applied to the Model150A400 2 2 2...

Страница 7: ...and which is denoted and entered as LF Commands are case sensitive and must be entered in upper case only in order to be recognized 2 2 2 6 IEEE 488 Communications For IEEE 488 communications the End or Identify EOI control line may also be used for command termination When sending commands to the Model150A400 via the IEEE 488 bus terminate each command with a LF an EOI or both No characters are p...

Страница 8: ...ier Detect DCD line must be asserted This line is sampled continuously to determine if the RS 232 connection is broken therefore it must remain asserted in order for the RS 232 interface to function The Clear To Send CTS line is also used to gate information from the Model150A400 This line must be asserted in order to receive information from the Model150A400 The CTS line can be used as a handshak...

Страница 9: ...are processed in the same manner as that of the IEEE 488 interface The command structure is identical except that there is no EOI line Therefore all commands are terminated with a line feed LF Since this is a full duplex asynchronous interface if the Model150A400 detects an error the error message is immediately transmitted to the host controller These error messages are defined in Table 2 2 2 2 2...

Страница 10: ...Syntax Px Parameters 0 power off 1 power on Example To turn the power on send the following command P1 LF 2 2 2 8 2 Gain Set Sets the gain in steps of Max Gain 4096 W Syntax Gxxxx Parameters 0000 Minimum Gain 4095 Maximum Gain 2 2 2 8 3 Reset Resets the Model150A400 clearing all faults if possible Syntax R Parameters None Example To clear a fault send the following command R LF ...

Страница 11: ...fed through the gain control assy to the gate of Q1 Gate bias for Q1 is supplied through R5 and adjusted by R4 The output of Q1 is coupled through C9 to the equalizing network R8 R9 R10 L5 and C11 The output of the equalizing network is coupled through C12 to the gate of Q2 Gate bias for Q2 is supplied through R12 and adjusted by R11 The output of Q2 is coupled through transformers T1 and T4 which...

Страница 12: ...amplifier All the have current limited outputs to protect them from shorts or over dissipation The 33VDC is fed through L1 which keeps switching transients from the supplies out of the amplifier circuits to the amplifier circuits If the currents in the output amplifiers get too high for the on board circuits to control or if the heat sink temperature gets too high a fault signal is generated to sh...

Страница 13: ...Research instruments are conservatively operated to provide maximum instrument reliability In spite of this parts within an instrument may fail Usually the instrument must be immediately repaired with a minimum of down time A systematic approach can greatly simplify and thereby speed up the repair However due to the importance of the amplifier s alignment it is recommended that when failure is cau...

Страница 14: ...TOR IN EXCESS OF 20 VOLTS THIS WILL RESULT IN TRANSISTOR GAT FAILURE 4 3 Troubleshooting Troubleshooting the Model150A400 in a logical manner can speed the solution to a problem The settings of potentiometers pots capacitors caps or other variables should not be disturbed until other problems have been eliminated Comparing the measured DC voltages to those shown on the schematics can solve many pr...

Страница 15: ...e 4V when the POWER switch S1 is in the normal position and 0 1V when S1 is depressed S1 is normally open it is closed only when it is depressed The amplifier should change state every time the POWER switch is depressed 4 3 1 7 If all voltages are correct and the unit still does not operate contact Amplifier Research to arrange for repair or replacement of the A4 Operate Control Board 4 3 2 The Un...

Страница 16: ...Model 150A400 Manual Text 4 3 REV B 4 3 3 Thermal Fault Schematic Diagram No 1010877 During a Thermal Fault the front panel VFD should read THERMAL FAULT ...

Страница 17: ...Model 150A400 is shipped with a mating connector which has a jumper between Pins 1 and 8 installed in the rear panel interlock connector The unit will not operate unless the interlock circuit is closed 4 3 4 1 In the event of an Interlock Fault the unit s front panel VFD should indicate INTERLOCK FAULT 4 3 4 2 Check to see if it is safe to power up the unit are there personnel present in the scree...

Страница 18: ...rrent rises to 9 amps U1 will decrease the bias voltage thereby decreasing the current If the amplifier is over driven to the point that the active bias cannot control the current to less than 10 0 amps U4 will generate a fault signal which will turn the power supplies off 4 3 6 Low or No Power Output DC Tests Schematic Diagram No 1010877 All indicators on the Model150A400 VFD are normal the VFD i...

Страница 19: ...Model 150A400 Manual Text 4 6 REV B ...

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