Nokia NHM-2nx Series Troubleshooting Manual Download Page 76

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NHM-2/5nx,ny/6/9

Troubleshooting

PAMS Technical Documentation

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This calibration is calibrating the Baseband filter inside Hagar, for this reason the calibration is not done
in both bands.

Select:

Tuning

Alt+t

RX Measurements

A window now pops-up:

In the "Select Function" frame select RX "Filter calibration (Automatic)".

No external signal is needed for this, just click "Measure", wait a few seconds and then click "Save
Defaults"

RX filter calibration is now completed and the "RX Measurements" window can be closed by clicking
"Close"

Summary of Contents for NHM-2nx Series

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Page 17: ...201 WDDISX to GND No Yes C211 towards N201 VBB 2 8 V C518 towards C506 VXO 2 8 V when PWR switch is pressed See section 2 See section Phone is dead No R308 PURX 1 2 8V after 60ms Yes Check C220 SLEEPCLK 32KHz square wave Check sleepclock circuit B200 R214 Defective N201 CCONT or overloaded PURX line No Yes Check buffer V502 R559 V502 coll RFC 13MHz clock 700mVpp typ Check G502 VCXO 26MHz Yes Yes N...

Page 18: ... or short circuit under the SRAM Defective SRAM D302 Algorithm file or alias not found Check the type of the flash MCU flash Vpp Error Flashing via X202 Voltage at R310 higher than 1 7 V when flashing Defective flash or flashing software has wrong version Defective MAD2 D300 defective voltagemonitor D304 or flashing software has wrong version or short circuit under SRAM Unknown error See section P...

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Page 25: ... 1 0 No Yes Yes No No No Check MAD2WD1 D300 Check COBBA N100 Check RF control lines during RX slot R502 0 1 2V typ R514 0 2 3V max Yes Check analog data signals during RX slot R507 RxIN COBBA 0 1 5V C514 RxIP COBBA 0 1 5V Recieved signals is biased to 1 2 DC nominal amplitude 125 450 mVpp AC If DC error Check COBBA N100 else Check RF part Check RF control lines during TX slot J503 TxP MAD2 0 1 2 8...

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Page 27: ...rd 4 5V min 5V SIM card Defective CCONT N201 ATR data can be seen at C222 towards R213 Check X400 and R213 Check CCONT N201 Yes Yes No No J206 SIMI O_C line is 1 during ATR meassage ATR data can be seen at SIMIF4 J202 Check MAD2 D300 No No Check CCONT N201 Yes Yes Earpiece doesn t work and there aren t any electrical or mechanical problems Check R119 R120 C122 C105 C125 C104 C126 Replace COBBA N10...

Page 28: ...403 C407 C120 R111 OK Yes Check R115 V101 C123 C113 Replace COBBA N100 No Headset earpiece doesn t work and there are no mechanical problems Check L401 R109 C101 C107 Replace COBBA N100 OK Headset microphone doesn t work and there are no mechanical problems R105 XMICN line towards COBBA N100 2 1V Check XMIC line to COBBA N100 L400 R105 C100 R102 C110 Check R105 R100 R101 V100 Replace COBBA N100 No...

Page 29: ...arger is connected Check X203 R221 R222 The voltage at R220 towards C236 BTEMP N201 0 5V when a charger is connected No Yes Yes Check X203 R221 R222 No When the battery is an NI battery then the voltage at R208 towards R200 must be app Vb 200 mV When the battery is a LI battery the voltage at R208 towards R200 must be Vb Yes Check R200 R208 V205 N200 No The voltage at R208 towards R200 and CHAPS N...

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Page 33: ...00mV div 500us div Both signals looks like Figure 1 Note 1 2 One or both signals Figure 3 or Figure 4 looks like Figure 2 or Yes No One or both signals looks like Figure 5 Yes Check C512 No One or both signals looks like Figure 6 Check C514 Yes No One or both signals looks like Figure 7 Check C526 Yes No Check Hagar N500 R504 Go to Troubleshooting chart EGSM RX Note 1 Only valid for MCU sw version...

Page 34: ...NHM 2 5nx ny 6 9 Troubleshooting PAMS Technical Documentation 3DJH 1RNLD RUSRUDWLRQ VVXH SULO Figure 1 I Q working ok ...

Page 35: ...PAMS Technical Documentation Troubleshooting NHM 2 5nx ny 6 9 VVXH SULO 1RNLD RUSRUDWLRQ 3DJH Figure 2 Check C508 ...

Page 36: ...NHM 2 5nx ny 6 9 Troubleshooting PAMS Technical Documentation 3DJH 1RNLD RUSRUDWLRQ VVXH SULO Figure 3 Check C508 C515 ...

Page 37: ...PAMS Technical Documentation Troubleshooting NHM 2 5nx ny 6 9 VVXH SULO 1RNLD RUSRUDWLRQ 3DJH Figure 4 Check C508 ...

Page 38: ...NHM 2 5nx ny 6 9 Troubleshooting PAMS Technical Documentation 3DJH 1RNLD RUSRUDWLRQ VVXH SULO Figure 5 Check C512 ...

Page 39: ...PAMS Technical Documentation Troubleshooting NHM 2 5nx ny 6 9 VVXH SULO 1RNLD RUSRUDWLRQ 3DJH Figure 6 Check C514 ...

Page 40: ...NHM 2 5nx ny 6 9 Troubleshooting PAMS Technical Documentation 3DJH 1RNLD RUSRUDWLRQ VVXH SULO Figure 7 Check C526 ...

Page 41: ... PHDVXUHPHQW SRLQWV XE B XE B XE B GSM1800 LNA RF out C519 Rx Tx switch EGSM_Rx C556 GSM 1800 LNA RF in L505 1st Rx SAW GSM1800 out Z501 1st Rx SAW GSM1800 in Rx Tx switch DCS_Rx GSM1800 Z502 Z502 1st Rx SAW EGSM in Rx Tx switch VC2 Z502 Rx Tx swicth VC1 Z502 LNA_P GSM1800 C568 1st Rx SAW EGSM out Z501 Rx Tx switch ANT Z502 ...

Page 42: ...echnical Documentation 3DJH 1RNLD RUSRUDWLRQ VVXH SULO EGSM LNA in C545 EGSM LNA out 2nd Rx SAW EGSM in C534 LNA_G EGSM V501 LNAB_D EGSM R508 2nd Rx SAW GSM1800 in Z500 2nd Rx SAW GSM1800 out Z500 2nd Rx SAW EGSM out Z500 RXIP and RXQP R504 ...

Page 43: ...rement points ub4_10 ub4_11 GSM1800 LNA RF out C519 Rx Tx switch EGSM_Rx C556 GSM 1800 LNA RF in C517 1st Rx SAW GSM1800 out Z501 Rx Tx switch DCS_Rx GSM1800 C547 Rx Tx switch VC2 Z502 Rx Tx swicth VC1 Z502 LNA_P GSM1800 C521 1st Rx SAW EGSM out Z501 Rx Tx switch ANT Z502 LNAB_G GSM1800 R513 and ub4_12 ...

Page 44: ...g Start Wintesla Service Software and Select Product Alt p Open NHM 5 Select Product Alt p Band b EGSM e Select Testing Alt e RF Controls r RX Continuous Alt r Cont Mode Ch 38 Alt o 38 AGC Absolute 4 Apply EGSM LNA in C545 EGSM LNA out 2nd Rx SAW EGSM in C534 LNA_G EGSM R514 LNAB_D EGSM R508 2nd Rx SAW GSM1800 in Z500 2nd Rx SAW EGSM out Z500 RXIP and RXQP R504 2nd Rx SAW GSM1800 out Z500 ...

Page 45: ...pply a 942 667 MHz channel 38 67 710kHz offset 55 dBm signal to the RF connector Measuring with an oscilloscope on RXIP or RXQP this picture should be seen on a working EGSM receiver Signal amplitude 550mV DC offset 1 2V Frequency 67kHz If this picture is not seen go to section Fault finding chart for EGSM receiver of this document ...

Page 46: ... Check C534 Z500 Yes Check T501 C520 C528 L504 Hagar N500 Yes Check BB No Yes No Yes No Yes Oscilloscope VRX 2 7V Hagar serial interface OK Check BB Yes No Check V501 C537 L520 C534 C541 L507 C545 Check V501 R508 C530 R530 C533 C541 C537 L506 R514 C539 Yes Check Hagar N500 Check 1st Dual RX SAW Z501 C556 Check RX TX Switch Z502 No Yes EGSM chain functional Local Continuos mode Set to Local Mode EG...

Page 47: ...nd LNAB_D 2 8V If the signal applied to the antenna connector is more than 45dBm the AGC will gain step the LNA LNA_G 2 8V and LNAB_D 0V which means the LNA Gain will now have negative gain loss of 12 dB From the LNA V501 RF out the signal is lead through the LNA output matching circuit C537 L520 and C534 through the 2nd Dual RX SAW Z500 In band insertion loss 3 5dB to the EGSM balun T501 From the...

Page 48: ...ect Product Alt p Open NHM 5 Select Product Alt p Band b PCN p Select Testing Alt e RF Controls r RX Continuous Alt r Cont Mode Ch 700 Alt o 700 AGC Absolute 4 Apply The set up should now look like this Apply an 1842 867 MHz channel 700 67 710kHz offset 55 dBm signal to the RF connection remember to compensate for cable and adapter attenuation Measuring with an oscilloscope on Hagar RXI or Hagar R...

Page 49: ...tion Troubleshooting NHM 2 5nx ny 6 9 VVXH SULO 1RNLD RUSRUDWLRQ 3DJH Signal amplitude 570V DC offset 1 2V Frequency 67kHz If this picture is not seen not go to section Fault finding chart for GSM1800 receiver of this document ...

Page 50: ... No No No Check C519 Z500 Yes Check T500 C507 C515 L500 Hagar N500 Yes Check BB No Yes No Yes No Yes Oscilloscope VRX 2 7V Hagar serial interface OK Check BB Oscilloscope V500 RFout 2 6 2 7V V500 RFin 0 8 0 9V Yes No Check V500 C517 C519 Check V500 R513 L502 C519 C517 C509 C510 R506 C521 C511 Yes Check Hagar N500 Check 1st Dual RX SAW Z501 C547 Check RX TX Switch Z502 No Yes GSM1800 chain function...

Page 51: ...e LNA has about 17dB gain when it is on LNAB_G 2 8V and LNA_P 0V If the signal applied to the antenna connector is more than 45dBm the AGC will gain step the LNA LNAB_G 2 8V and LNA_P 0V which means the LNA Gain will now have negative gain loss of 8dB From the LNA V500 RF out the signal is lead through the LNA output matching circuit C519 through the 2nd Dual RX SAW Z500 In band insertion loss 3 5...

Page 52: ... gain loss of 12dB From the LNA V500 RF out the signal is lead through the LNA output matching circuit C519 L502 through the 2nd Dual RX SAW Z500 In band insertion loss 3 5dB to the GSM1800 balun T500 From the balun the signal is balanced and is lead to Hagar N500 IMP_P_RX and INM_P_RX DJDU The balanced RX signal is mixed with a signal from the local oscillator at the same frequency as the wanted ...

Page 53: ...EGSM measurements out of range 28 to 32 Some or all GSM1800 measurements out of range 28 to 32 Go to chart EGSM RX Troubleshooting Go to chart GSM1800 RX Troubleshooting Check R509 R512 C535 C536 and BB RX OK Go to BB chart Phone not registering to a Network Some or all GSM1800 measurements above 2 All measurements in range 28 to 32 Go to chart RX Troubleshooting All measurements below 2 Go to cha...

Page 54: ... SULO 60 7UDQVPLWWHU DET Ant Switch RX RX TX TX OUTP_D_TX OUTM_D_TX OUTP_G_TX OUTM_G_TX 2 2 2 2 Open collector Open collector GSM PCN VBATT PWC DET TXP TXC Vpctrl_fb Vpctrl_g Vpctrl_p RF Controls VB_DET V_ANT_1 V_ANT_2 2 PA Dir Coupler TXC TXP VBATT TXQ_0 TXQ_180 TXI_0 TXI_180 VTX VTXLO_G ...

Page 55: ...GSM1800 N502 PA Pout GSM1800 N502 DET0 C588 Rx Tx switch VC2 Z502 PA Vtxlo N502 PA Pout EGSM N502 Antenna pad PA Pin EGSM R551 PA Vpctrl EGSM R532 Rx Tx switch DCS_Tx GSM1800 C569 Rx Tx switch EGSM_Tx L518 Rx Tx switch ANT Z502 Rx Tx switch VC1 Z502 PA Vpctrl GSM1800 N502 TXI andTXQ R541andR548 T503unbalanced C566 T504unbalanced ...

Page 56: ...PHDVXUHPHQW SRLQWV XE XE XE PA Pin GSM1800 N502 N502 PA Pout GSM1800 N502 DET0 C588 Rx Tx switch VC2 Z502 PA Pout EGSM N502 Antenna pad PA Pin EGSM R551 PA Vpctrl EGSM R532 Rx Tx switch DCS_Tx GSM1800 C569 Rx Tx switch EGSM_Tx L518 Rx Tx switch ANT Z502 Rx Tx switch VC1 Z502 PA Vpctrl GSM1800 N502 ...

Page 57: ...XFWLRQV IRU 60 7 WURXEOHVKRRWLQJ Start WinTesla Service Software and Select Product Alt p Band b GSM g Select Testing Alt e RF Controls r TX Burst Alt b TX Data Type Random Alt d r TX Power Level 5 Alt x 5 Channel 60 Alt n 60 Apply Alt a TXI and TXQ R541 and R548 T503 unbalanced Z504 or C566 T504 unbalanced ...

Page 58: ...NHM 2 5nx ny 6 9 Troubleshooting PAMS Technical Documentation 3DJH 1RNLD RUSRUDWLRQ VVXH SULO Your screen should look like this Measure the output power of the phone it should be around 32 dBm ...

Page 59: ...m Measure TX power on Pin Power 25 dBm in 500 ohm No Measure TX power unbal T504 Power 30 dBm in 500 ohm With Osc check VTX 2 7V discretes around T504 Check POGO pins C593 L510 Yes Measure TX power on GSM_Tx Power 8 dBm in 500 ohm With Osc on RXTX switch check Vc1 0V Vc2 2 7V Yes Check L515 Coupler Check RXTX switch Yes Check Hagar Serial bus With Osc on PA check Vpctrl GSM900 Vpctrl 1 7Vpp see fi...

Page 60: ...D RUSRUDWLRQ VVXH SULO DXOW ILQGLQJ LQ PRGXODWLRQ The following plots show different situations of TX IQ measurements Depending on the time the mod ulation may cause the signal to look differently For how to check Hagar and serial bus see section Hagar and serial interface ...

Page 61: ...llow the transmitted signal act as normal RF cable should be connected to measurement equipment or to at least a 10 dB attenuator otherwise the PA may be damaged Start WinTesla Service Software and Select Product Alt p Band b PCN p Select Testing Alt e RF Controls r TX Burst Alt b TX Data Type Random Alt d r TX Power Level 0 Alt x 0 Channel 700 Alt n 700 Apply Alt a Your screen should look like ...

Page 62: ...T Power 27 5 dBm in 50 ohm Measure TX power on Pout Power 7 dBm in 500 ohm Measure TX power on Pin Power 17 dBm in 500 ohm No Measure TX power unbal T503 Power 18 dBm in 500 ohm With Osc check VTX 2 7V discretes around T503 Check POGO pins C593 L510 Yes Measure TX power on DCS_Tx Power 7 dBm in 500 ohm With Osc on RXTX switch check Vc1 2 7V Vc2 0V Yes Check L515 Coupler Check RXTX switch Yes Check...

Page 63: ...Q 3DJH 0HDVXUHPHQW SRLQWV DW WKH 9 7 2 9 7 2 PHDVXUHPHQW SRLQWV XE B XE B 9 7 2 PHDVXUHPHQW SRLQWV XE B XE B DQG XE B VCTCXO 26 MHz out C546 VCTCXO buffer input V502 VCTCXO Vtcxo 2 7V C543 RFC 13MHz L511 VCTCXO 26 MHz out C546 VCTCXO buffer input V502 VCTCXO Vtcxo 2 7V C543 RFC 13MHz L511 ...

Page 64: ... Alt r Cont Mode Ch 60 Alt o 60 Measure the output of the VCO G500 at T502 with spectrum analyzer and 500 ohm passive probe the power should be around 20 dBm 0 UHIHUHQFH RVFLOODWRU 9 7 2 The 26 MHz oscillator G502 is used as a reference frequency for the PLL synthesizer and as the sys tem clock for BB 13 MHz after it is divided by 2 in HAGAR 26 MHz signal from the VCTCXO is approx 0 8 Vpp Frequenc...

Page 65: ...PAMS Technical Documentation Troubleshooting NHM 2 5nx ny 6 9 VVXH SULO 1RNLD RUSRUDWLRQ 3DJH COBBA Range of Vcon is 0 3 2 3 V 0HDVXULQJ RQ WKH 9 7 2 FRPSRQHQW 0HDVXULQJ RQ WKH 9 7 2 EXIIHU ...

Page 66: ...VCO power supply is present 2 7V DXOW ILQGLQJ FKDUW IRU 3 6 QWKHVL HU It is important to say that power supply for VCTCXO VXO is OFF only in Deep Sleep Mode and power supply for VCO G500 Vcc is OFF in Sleep Mode From WinTesla chose Product Band EGSM Testing RF Controls Rx continuous Ch 60 Spectrum Analyzer VCO G500 output at T502 3788 MHz No Yes PLL block functional Oscilloscope VCTCXO G502 Power ...

Page 67: ...illoscope Turn the phone ON and measure VCTCXO G502 power supply Vtcxo at C543 2 7 V Oscilloscope Measure 26 MHz VCTCXO output signal at C546 approx 1 2 Vpp Oscilloscope Measure 13 MHz buffer input at V502 approx 0 4 Vpp Oscilloscope Measure 13 MHz buffer output at L511 approx 0 6Vpp Check CCONT phone is dead VCTCXO is dead Check HAGAR divider by 2 in HAGAR not in function not enabled Buffer trans...

Page 68: ... 6 3542 4 3722 4 28 895 6 940 6 3582 4 3762 4 90 908 953 3632 3812 1003 885 8 930 8 3543 2 3723 2 29 895 8 940 8 3583 2 3763 2 91 908 2 953 2 3632 8 3812 8 1004 886 931 3544 3724 30 896 941 3584 3764 92 908 4 953 4 3633 6 3813 6 1005 886 2 931 2 3544 8 3724 8 31 896 2 941 2 3584 8 3764 8 93 908 6 953 6 3634 4 3814 4 1006 886 4 931 4 3545 6 3725 6 32 896 4 941 4 3585 6 3765 6 94 908 8 953 8 3635 2 ...

Page 69: ...0 6 3551 2 3741 2 558 1719 4 1814 4 3438 8 3628 8 652 1738 2 1833 2 3476 4 3666 4 746 1757 1852 3514 3704 840 1775 8 1870 8 3551 6 3741 6 559 1719 6 1814 6 3439 2 3629 2 653 1738 4 1833 4 3476 8 3666 8 747 1757 2 1852 2 3514 4 3704 4 841 1776 1871 3552 3742 560 1719 8 1814 8 3439 6 3629 6 654 1738 6 1833 6 3477 2 3667 2 748 1757 4 1852 4 3514 8 3704 8 842 1776 2 1871 2 3552 4 3742 4 561 1720 1815 ...

Page 70: ...in Normal mode or in Local mode either RX or TX band there is going to be some Hagar activities which is controled through serial interface SDATA SCLK SENA and HAGAR_RESET_X Pictures below show these four signals measured on R301 both SCLK and SENA on R300 SDATA and C540 HAGAR_RESET_X R301 and R300 are placed in BB part Figure 3 SCLK clock signal Figure 4 SENA enable signal Figure 5 SDATA data sig...

Page 71: ...rrents This volage should be excactly the same value as VREF on C536 Next step towards examination of the the Hagar functionality can be based on verification of some important bias voltages and bias controls Those signal coming from Hagar and they are used for con troling the LNA s biasing both 900 1800MHz LNA power supply and TX power detector As a reference here is a list of some typical test p...

Page 72: ...ht be wise to play it safe and do RF tunings in accordance with the table below In general repairs in the TX part will require tuning of TX Power and TX I Q tuning In general repairs in the RX part or PLL will always require RX Calibration and in some cases require AM Suppression tuning Automatic and RX Filter Calibration Automatic Other parts interfacing to TX RX or PLL might require tuning but c...

Page 73: ...h bands but the calibration only have to be started once it will automatically proceed to the GSM1800 band after EGSM Select Product Alt p Band b EGSM e Select Tuning Alt t RX Calibration r A window will now pop up Connect an external generator to the phones RF connector and set the generator as the window tells you Click OK in the Wintesla window now a new window pops up Change the level on the g...

Page 74: ...RNLD RUSRUDWLRQ VVXH SULO Click OK in the Wintesla window now a new window pops up Click Save in the Wintesla window now a new window pops up Change the level and frequency on the generator as the window tells you Click OK in the Wintesla window now a new window pops up ...

Page 75: ...g NHM 2 5nx ny 6 9 VVXH SULO 1RNLD RUSRUDWLRQ 3DJH Change the level and frequency on the generator as the window tells you Click OK in the Wintesla window now a new window pops up Click Save in the Wintesla window RX Calibration is now completed ...

Page 76: ...for this reason the calibration is not done in both bands Select Tuning Alt t RX Measurements A window now pops up In the Select Function frame select RX Filter calibration Automatic No external signal is needed for this just click Measure wait a few seconds and then click Save Defaults RX filter calibration is now completed and the RX Measurements window can be closed by clicking Close ...

Page 77: ... in both bands If flash or Hagar has been replaced or Full Factory settings have been performed RX AM Suppression must be done EGSM Select Product Alt p Band b EGSM e Select Tuning Alt t RX Measurements A window now pops up In the Select Function frame select RX RX AM Suppression Automatic Click Measure A window now pops up Connect an external generator to the antenna connector of the phone and se...

Page 78: ...e Winteslwindow the RSSI value is updated in the RX Measurements window Click Save The RX AM suppression tuning is now completed in EGSM Click Yes to proceed to PCN band 60 Select Product Alt p Band b PCN p Select Tuning Alt t RX Measurements In the Select Function frame select RX RX AM Suppression Automatic ...

Page 79: ... ny 6 9 VVXH SULO 1RNLD RUSRUDWLRQ 3DJH Click Measure A window now pops up Connect an external generator to the antenna connector of the phone and set up the generator Click OK in the Wintesla window the RSSI value is updated in the RX Measurements window ...

Page 80: ...The RX AM suppression tuning is now completed in PCN 7 3RZHU WXQLQJ This tuning must be done in both bands 60 Select Product Alt p Band b EGSM e Select Testing Alt e RF Controls r A window now pops up Set Active unit to TX Set TX Data Type to Rand Click Apply Click Close Select Tuning Alt t TX Power Alt P ...

Page 81: ...SRUDWLRQ 3DJH A window now pops up Tune level 19 15 5 and Base in accordance with the target values Note Target values may vary due to different PA vendors Click calculate check if the other levels match the targets correct if necessary Click Save when all values match the targets ...

Page 82: ...al Documentation 3DJH 1RNLD RUSRUDWLRQ VVXH SULO 60 Select Product Alt p Band b PCN p Select Testing Alt e RF Controls r A window now pops up Set Active unit to TX Set TX Data Type to Rand Click Apply Click Close Select Tuning Alt t TX Power Alt P ...

Page 83: ...SRUDWLRQ 3DJH A window now pops up Tune level 15 11 0 and Base in accordance with the target values Note Target values may vary due to different PA vendors Click calculate check if the other levels match the targets correct if necessary Click Save when all values match the targets ...

Page 84: ...ng must be done in both band Initial set up EGSM Select Product Alt p Band b EGSM e Select Testing Alt e RF Controls r A window now pops up Set Active unit to TX Set TX Data Type to Cont1 Click Apply Click Close Go through the Common tuning procedure for EGSM and GSM1800 described in section 11 6 2 of this document ...

Page 85: ... 3DJH QLWLDO VHW XS 60 Select Product Alt p Band b PCN p Select Testing Alt e RF Controls r A window now pops up Set Active unit to TX Set TX Data Type to Cont1 Click Apply Click Close Go through the Common tuning procedure for EGSM and GSM1800 described in section 11 6 2 of this document ...

Page 86: ...ct Tuning Alt t TX I Q Alt q A window now pops up The carrier M2 and 67kHz M3 signal should now be tuned to a minimum The buttons in the TX I and Q DC Offset will change the level of the carrier The buttons in the Amplitude and Phase Difference window will change the level of the 67kHz sig nal When minimum values are reached click Save ...

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Summary of Contents for NHM-2nx Series

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Nokia NHM-2nx Series, Troubleshooting Manual, Page: 76 / 86

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Summary of Contents for NHM-2nx Series

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