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• Fidel Eduardo Montenegro

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GEMSS Medical NHFG Service Manual

1.SPECIFICATIONS MODEL

RMX-550R

RMX-750R

RMX-850R

R

R

R

HighFrequency Inverter(400KHz)

HighFrequency Inverter(400KHz)

HighFrequency Inverter(400KHz)

CONSTANT OUTPUT(Kw)

50Kw

50Kw

80Kw

Kvp

40~150Kv

40~150Kv

40~150Kv

mA Range

10~500mA

10~700mA

10~800mA

Exposure Time

0.001~10 sec

0.001~10 sec

0.001~10 sec

AEC

Enable

Enable

Enable

APR

250

250

250

Power Line

3-Phase 380VAC

3-Phase 380VAC

3-Phase 380VAC

ROTOR

OPTIONAL LOW / DUAL

OPTIONAL LOW / DUAL

DUAL SPEED STARTER (HIGH / LOW)

Input Frequency(Hz)

50/60

50/60

50/60

TYPE

1. POWER LINE REQUIREMENTS 

50Kw Three-Phase Line Voltage: 380VAC±5% Line Frequency: 50/60Hz Momentary Current: 100Amps Stanby Current: 5Amps



80Kw Three-Phase Line Voltage: 380VAC±5% Line Frequency: 50/60Hz Momentary Current: 150Amps Stanby Current: 5Amps

PAGE 1 / 27

GEMSS Medical NHFG Service Manual

Mode l

RMX550R (50K w) RMX750R (50K w) RMX850R (80K w)

Main Voltag e

Minimum Recommend ed Main Disconnect to HFG

HFG Momenta ry Line Current

Minimum Recommend ed Generator Service Rating

Minimum Recommend ed Distribution Transformer Rating

Groun d Wire Size

Apparent Mains Resistan ce

380VA C

#6 (15mm2)

100A

100A

65kVA

#4 (25mm 2)

0.17Ω

380VA C

#6 (15mm2)

100A

100A

85kVA

#4 (25mm 2

0.13Ω

380VA C

#6 (15mm2)

150A

100A

105kVA

#4 (25mm 2

0.11Ω

2..INSTALL 

INSTALL POWER LINE

  

Securely fix the Power Line to the Terminal. Connect Ground Line to the Bolt where GND Lines are gathered using 5mm NUT st 1 type Ground is recommended.

PAGE 2 / 27

GEMSS Medical NHFG Service Manual



TRANSFORMER CONNECTION

 In the case of RMX-850R, Transformer is connected as the picture.  Depending on Main Voltage, Transformer’s Connection shall be changed.

< When input voltage is not 380VAC>  Separate the socket which is connected to 380VAC, and change to match the Main Voltage. Changeable Voltages are 360VAC 380VAC 400VAC.



RMX-850R Transformer Connection

PAGE 3 / 27

GEMSS Medical NHFG Service Manual





RMX-550/750R(Low Rotor) Transformer Connection

ROTOR CONNECTION Tube Side

Generator Side

1

5.W(Com)

2

4.B(Main)

3

3.G(Phase)

5

1.Tube Temp

6

2.Tube Temp

PAGE 4 / 27

GEMSS Medical NHFG Service Manual

3. SETTING 

DIP SWITCH Check(Product set up check)

CPU BOARD

DIP SWITCH (SW1)

PIN

SW1

SW2

SW3

SW4

ON

BUCKY1 SPRING

BUCKY2 SPRING

BUCKY3 SPRING

AEC OFF

OFF

BUCKY1 MOTOR

BUCKY2 MOTOR

BUCKY3 MOTOR

AEC ON

SW5 ROTOR ERROR NO CHECK

SW6 FILAMENT ERROR NO CHECK

SW7 CHARGE ERROR NO CHECK

SW8 TEMP ERROR NO CHECK

ROTOR ERROR CHECK

FILAMENT ERROR CHECK

CHARGE ERROR CHECK

TEMP ERROR CHECK

PAGE 5 / 27

GEMSS Medical NHFG Service Manual

DIP SWITCH (SW2)

MODEL SETTING RMX-550R RMX-750R RMX-850R

SW1 ON ON OFF

SW2 OFF ON ON

SW3 ON OFF OFF

TUBE SETTING E7239X E7252X RAD13 E7869X USER USER USER USER

SW4 ON OFF ON OFF ON OFF ON OFF

SW5 ON ON OFF OFF ON ON OFF OFF

SW6 ON ON ON ON OFF OFF OFF OFF

FREQUENCY SETTING 50Hz 60Hz

SW7 OFF ON

ROTOR SPEEP SETTING HIGH SPEED ROTOR (DUAL ROTOR) LOW SPEED ROTOR

SW8 OFF ON

After DIP SW CHECK, Check if it is matching to the Setting for Hardware Information of CONSOLE

PAGE 6 / 27

GEMSS Medical NHFG Service Manual

4.CHECK POINT After INSTALL 

3MAIN POWER BOARD

LD2

LD1

VDD

GND

TEST POINT LD2 LD1 VDD-GND

VALUE ON ON DC520V~DC550V

REMARK Generator Power On Main Voltage On Fault < DC520V

PAGE 7 / 27

GEMSS Medical NHFG Service Manual



LOW POWER BOARD

TEST POINT LD1 LD2 TP1-GND TP2-GND

VALUE ON ON +12VDC -12VDC

REMARK +12VDC ON -12VDC ON Adjustment By VR1 FIXED

PAGE 8 / 27

GEMSS Medical NHFG Service Manual



CPU POWER BOARD

TEST POINT LD1~LD6 +5V-GND +24V-GND +15V-GND +12V-GND -15V-GND

VALUE ALL ON +5VDC +24VDC +15VDC +12VDC -15VDC

REMARK ALL DC VOLTAGE ON

PAGE 9 / 27

GEMSS Medical NHFG Service Manual



CPU BOARD

TEST POINT LD5~LD9

VALUE ALL ON

LD1~LD4

OFF

REMARK ALL DC VOLTAGE ON ON only during Program Writing on CPU

PAGE 10 / 27

GEMSS Medical NHFG Service Manual



FILAMENT BOARD

TEST POINT LD1

VALUE ON

LD2~LD3

ALL ON

TP1, TP2

TP4

TP7-TP8

REMARK POWER FROM FILAMENT SMPS +12VDC, -12VDC ON FROM LOW POWER BOARD-

Normal: Large Focus(200mA)=0.9VDC Small Focus(100mA)=0.6VDC

Ready Button Push: Large Focus(200mA)=2.5VDC Small Focus(100mA)=1.7VDC

Normal: Large Focus(200mA)=1.8VDC Small Focus(100mA)=1.5VDC

Ready Button Push: Large Focus(200mA)=3VDC Small Focus(100mA)=2.3VDC

52VDC

When it is less than 52VDC, more than 500mA cannot normally exposed.

PAGE 11 / 27

GEMSS Medical NHFG Service Manual

TEST POINT

VALUE

REMARK

Adjust to VR1 (Factory Setting)

TP3-GND

1V 

10usec

15usec per one cycle

NEW CONTROL BOARD

TEST POINT LD1~LD8

VALUE OFF

LD9~LD10

ALL ON

LD13

ON Large Focus: ON Small Focus: OFF

LD12

REMARK It is on when ERROR occurs. +12VDC, -12VDC ON FROM LOW POWER BOARD-

PAGE 12 / 27

GEMSS Medical NHFG Service Manual



POWER RELAY BOARD

TEST POINT J4

VALUE

REMARK

360~380VAC

From Transformer

200~220VAC

From Transformer

100~110VAC

From Transformer

J4

J4

J5 High Rotor : 360VAC Low Rotor : 200VAC

Rotor

Power

J6 200~220VAC

Fan

Power

PAGE 13 / 27

GEMSS Medical NHFG Service Manual

J7 200~220VAC



Use only when it is High(Dual) Rotor

ROTOR POWER SWITCHING BOARD(NOT USE LOW ROTOR)

TEST POINT

VALUE

LD1

OFF

LD2

ON

REMARK High Rotor : ON Low Rotor : OFF POWER for Collimator (J2,J6 USE)

J4 200~380VAC

High Rotor Low Rotor

: 360~380VAC : 200~220VAC

PAGE 14 / 27

GEMSS Medical NHFG Service Manual



DUAL ROTOR BOARD

LED DESCRIPTION START RUN STOP 180Hz 60Hz ON/OFF TEST POINT

VALUE

REMARK

START LED ON

It is ready before press “Ready” button.

START LED ON STOP LED ON 60Hz LED ON

It is Standby during LOW ROTOR driving condition.

START LED ON STOP LED ON 60Hz LED ON RUN LED ON ON/OFF LED ON START LED ON STOP LED ON 180Hz LED ON

“READY” BUTTON is pressed during LOW ROTOR driving condition.

During HIGH ROTOR driving condition.

PAGE 15 / 27

GEMSS Medical NHFG Service Manual

START LED ON STOP LED ON 180Hz LED ON RUN LED ON ON/OFF LED ON

“READY” BUTTON is pressed during HIGH ROTOR driving condition.

J10 200~380VAC



High Rotor Low Rotor

: 360~380VAC : 200~220VAC

60Hz ROTOR BOARD(Only Low Rotor Speed)

TEST POINT LD1

VALUE OFF

LD2, LD3

ON

REMARK On when it’s Ready +12VDC, -12VDC ON FROM LOW POWER BOARD

J1 200~220VAC

Low Rotor Power

PAGE 16 / 27

GEMSS Medical NHFG Service Manual



NEW CONTROL VCO BOARD

TEST POINT

VALUE

REMARK

Level does not change. Only Frequency will be changed according to Kv, and mA.

TP1-GND TP2-GND

5V

10usec

PAGE 17 / 27

GEMSS Medical NHFG Service Manual

Level does not change. Only pulse interval will be changed according to Time.

TP3-GND

2V

10msec

5.ERROR CODES AND TROUBLE SHOOTING GUIDE Error Code Error 01

Description Fault_Rotor_Signal

Error 03

☞Rotor Power Check, Rotor Cable Check, Tube Check Check the voltage of ROTOR BD. Check if the LED of ROTOR BD is normally ON. Check if the ROTOR Cable is properly connected to GENERATOR. Fault_FET_Power

Error 04

☞Check Mosfet Board Input Power The error cannot be identified in the field. Returning to factory is required. Fault_FET_A

Error 05

☞Mosfet Board Overcurrent >>>Change Board The error cannot be identified in the field. Returning to factory is required. Fault_FET_B

Error 06

☞Mosfet Board Overcurrent >>>Change Board The error cannot be identified in the field. Returning to factory is required. Fault_FET_C

Error 07

☞Mosfet Board Overcurrent >>>Change Board The error cannot be identified in the field. Returning to factory is required. Fault_KV ☞Check New Control KV BD or Control Main BD Replacement of NEW CONTROL MAIN BD MODULE is recommended. PAGE 18 / 27

GEMSS Medical NHFG Service Manual

Error 08

Fault_ mA

Error 10

☞Check New Control mA BD or Control Main BD Replacement of NEW CONTROL MAIN BD MODULE is recommended. Fault_Fil_Power ①Check if the voltage of J4 on N-Filament BD is measured as the order of +12VDC,-12VDC, and GND ②Check if DC48~52V is measured on TP7 and TP8.

Error 11 Error 12

Fault_Fil_Over Replacement of N-FILAMENT BD is required. Fault_Fil_Low ①Check if FILAMENT of X-RAY TUBE is Pre-heating ②HIGHTENSION VOLTAGE CHECK

Check the Voltage supplying to J2 of Tank [LG COM SM] In 40KV 100mA condition, measure the AC Voltage at COM and SM with DVM First AC7~9V >>> When it’s READY, it will be changed to AC13~15V In 40KV 200mA condition, measure the AC Voltage at COM and LG with DVM. First AC7~9V >>> When it’s READY, it will be changed to AC13~16V. ③FILAMENT BD VOLTAGE CHECK ERRRO will be occurred when the voltage of TP4 and GND is more than 5V. At LARGE FOCUS, 1.8V→3V(READY) At SMALL FOCUS, 1.5V→2.3V(READY) Above voltage allows little difference, and it is used only for checking the change of the level. ☞ If Pre-heating in ① is checked, but the result of checking of ②③ is not measured, replacement of FILAMENT BD is required.

Error 15

If the result of ②③ are measured but Pre-heating of ① is not checked, replacement of Tank is required. Fault_Charge ☞Check Main Power (3Phase power)

PAGE 19 / 27

GEMSS Medical NHFG Service Manual

The voltage shall be measured as above picture and more than DC520V shall be measured. If the voltage is less than 520VDC, an ERROR can be occurred when X-ray is exposure on high condition.

Error 16

Check if above Magnetic SW is pressed. If two of Magnetic SW are not pressed, ERROR can be occurred because of abnormal power supply. Fault_Temp

Error 22

☞Tube overheating It can be happened when Tube is overheated or mal-connection of cables between TUBE and ROTOR BD. Fault_AD_FIL

Error 23

Error 24

☞Check Filament Board It’s not possible to check in the field as it’s the problem with AD Converter of FILAMENT BD. Replacement of FILAMENT BD is recommended. Fault_PW_CPU1 ☞Check CPU Power Board Check if the LED of CPU POWER BD as above picture is ON. Check the output of voltage for each TEST POINT. If the output of voltage is not correct, CPU POWR BD shall be replaced. Fault_PW_CPU2 ☞Check CPU Power Board Same action is required as ERROR 23. PAGE 20 / 27

GEMSS Medical NHFG Service Manual

Error 25

Fault_PW_CPU3

Error 26

☞Check CPU Power Board Same action is required as ERROR 23.. Fault_PW_CPU4

Error 27

☞Check CPU Power Board Same action is required as ERROR 23. Fault_PW_CTL1

Error 28

☞Check New Control Main BD Check if the voltage of +12V -12V GND is supplied from J13 on NEW CONTROL BD. Fault_PW_CTL2

Error 31

☞Check New Control Main BD Check if the voltage of +12V -12V GND is supplied from J13 on NEW CONTROL BD. Fault_AD_WORK ☞Check CPU Board Replacement of CPU BD is required. Fault_KV_EEPROM ☞Check CPU Board EEPROM It occurs when the KV data at EEPROM of CPU BD is over than its limited value. Replacement of EEPROM is recommended. Fault_MA_EEPROM

Error 32

☞Check CPU Board EEPROM It occurs when the mA data at EEPROM of CPU BD is over than its limited value. Replacement of EEPROM is recommended. Fault_S_PREHEAT_EEPROM

Error 33

☞Check CPU Board EEPROM It occurs when the SMALL FOCUS PREHEATING data at EEPROM of CPU BD is over than its limited value. Replacement of EEPROM is recommended. Fault_L_PREHEAT_EEPROM

Error 29

Error 30

Error 35

☞Check CPU Board EEPROM It occurs when the LARGE FOCUS PREHEATING data at EEPROM of CPU BD is over than its limited value. Replacement of EEPROM is recommended. Fault_Feedback_High ☞Check CPU Board & New Control BD It occurs when the value of FEEDBACK is too high. Replacement of CPU BOARD and NEW CONTROL MAIN BD is recommended.

PAGE 21 / 27

GEMSS Medical NHFG Service Manual

6.CALIBRATION 

mA CALIBRATION

NEW CONTROL MAIN BOARD

TEST POINT TP1 TP2 TP3 TP4

VALUE Small Focus mA Testing Point Small Focus GND Point Large Focus mA Testing Point Large Focus GND Point

REMARK 20mA / 1V Oscilloscope GND 100mA / 1V Oscilloscope GND PAGE 22 / 27

GEMSS Medical NHFG Service Manual

VR2 VR3 VR1

mA offset adjust Small mA feedback value adjust Large mA feedback value adjust

Factory setting Factory setting Factory setting

Large Focus mA adjust

Small Focus mA adjust

N-FILAMENT BOARD

FIL OUTPUT ADJ BOARD

TEST POINT

VALUE

VR1

Small Focus mA feedback value adjust

VR2

Large Focus mA feedback value adjust

REMARK Adjust Volume. Adjust the value of Small Focus mA to 20mA/1V. Adjust Volume. Adjust the value of Large Focus mA to 100mA/1V.

PAGE 23 / 27

GEMSS Medical NHFG Service Manual



Kv CALIBRATION

TEST POINT

VALUE

REMARK

TP1

VCO Control Votage

factory testing point

TP2

kVp offset voltage

factory testing point

TP3

kVp GND Point

Oscilloscope GND

TP4

kVp Testing Point

20kVp / 1V

VR1

kVp output adjust

Factory setting

VR1

Large mA feedback value adjust

Factory setting PAGE 24 / 27

GEMSS Medical NHFG Service Manual



FEEDBACK WAVEFORM

SMALL FOCUS TEST

20Kv/1V 20Ma/1V TIME: 0.05S

VALUE

WAVEFORM

80Kv 100mA

120Kv 100mA

140Kv 100mA

PAGE 25 / 27

GEMSS Medical NHFG Service Manual

LARGE FOCUS TEST

20Kv/1V 100mA/1V TIME: 0.05S

VALUE

WAVEFORM

80Kv 200mA

110Kv 320mA

80Kv 400mA

PAGE 26 / 27

GEMSS Medical NHFG Service Manual

7.BLOCK DIAGRAM

PAGE 27 / 27