# Problem with CM7700 **URL:** \ **Category:** Legacy AirPrime modules\ **Created:** [April 12, 2023, 4:05pm UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514 "2023-04-12T16:05:26Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![williamxcarneiro](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@williamxcarneiro](https://forum.sierrawireless.com/u/williamxcarneiro)\ **Post date:** [April 12, 2023, 4:05pm UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/1 "2023-04-12T16:05:27Z")
Hi, I’m trying to get LTE connection with a CM7700 (initially on a Raspberry Pi, and I actually try on my Windows 10 computer). The CM7700 is pluged into a base Hat LTE for raspberry which works on USB. Currently, I’ve entered my pin code, and now there is “No service” message on Skylight application. The APN is set correctly (Orange France, APN : orange, username : orange, password : orange) I don’t understand why it doesn’t work, and how to make it to work… Is someone can help me ? 😕 (sry for bad english…) ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [April 12, 2023, 4:15pm UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/2 "2023-04-12T16:15:39Z")
Can you check the following AT command? Ati3 AT!GSTATUS? AT+cpin? at+cgdcont? ---
**Author:** ![williamxcarneiro](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@williamxcarneiro](https://forum.sierrawireless.com/u/williamxcarneiro)\ **Post date:** [April 13, 2023, 8:13am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/3 "2023-04-13T08:13:57Z")
Sure, there is the result : ```auto ATI3 Manufacturer: Sierra Wireless, Incorporated Model: MC7700 Revision: SWI9200X_03.05.29.03ap r6485 CNSHZ-ED-XP0031 2014/12/02 17:53:15 IMEI: 01XXXXXXXX88 IMEI SV: 23 FSN: CDC0554049110 3GPP Release 8 +GCAP: +CGSM,+FCLASS,+DS ``` ```auto AT!GSTATUS? !GSTATUS: Current Time: 1095 Temperature: 22 Bootup Time: 1 Mode: LOW POWER MODE System mode: Unknown PS state: Not attached GMM (PS) state:NULL --- MM (CS) state: NULL --- ``` Even on my Raspberry with qmicli command, modem seems to be always in Low Power Mode … ```auto AT+CPIN? +CPIN: READY ``` ```auto AT+CGDCONT? +CGDCONT: 1,"IP","","0.0.0.0",0,0 +CGDCONT: 2,"IP","wap.cingular","0.0.0.0",0,0 +CGDCONT: 3,"IPV4V6","10767.mcs","0.0.0.0",0,0 +CGDCONT: 16,"IPV4V6","BroadbandAuto.APN","0.0.0.0",0,0 ``` ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [April 13, 2023, 8:20am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/4 "2023-04-13T08:20:23Z")
you need to power on the modem by “AT+CFUN=1” BTW, is the APN correct in +CGDCONT? ---
**Author:** ![williamxcarneiro](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@williamxcarneiro](https://forum.sierrawireless.com/u/williamxcarneiro)\ **Post date:** [April 13, 2023, 9:33am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/5 "2023-04-13T09:33:19Z")
When I sent “AT+CFUN=1” I got a “ERROR”. No, the APN isn’t correct in AT+CGDCONT? While I did set the APN in Skylight and in the Windows settings. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [April 13, 2023, 9:36am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/6 "2023-04-13T09:36:24Z")
how about this? ```auto AT!ENTERCND="A710" AT!PCINFO? AT+CMEE=1 AT+CFUN=1 ``` ---
**Author:** ![williamxcarneiro](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@williamxcarneiro](https://forum.sierrawireless.com/u/williamxcarneiro)\ **Post date:** [April 13, 2023, 9:37am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/7 "2023-04-13T09:37:50Z")
```auto AT!ENTERCND="A710" OK AT!PCINFO? State: 0 (LPM) LPM force flags - W_DISABLE:0, User:0, Temp:0, Volt:1, Auth:0 W_DISABLE: 0 Poweroff mode: 1 LPM Persistent: 0 OK AT+CMEE=1 OK AT+CFUN=1 ERROR ``` ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [April 13, 2023, 9:45am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/8 "2023-04-13T09:45:26Z")
it shows voltage problem ![image](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/e/ee1f3d9594e6f112df4c370f045542c3dc2a8169.png) Not sure if AT!PCVOLTLIMITS can help to overcome this problem, you can double check ---
**Author:** ![williamxcarneiro](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@williamxcarneiro](https://forum.sierrawireless.com/u/williamxcarneiro)\ **Post date:** [April 13, 2023, 10:01am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/9 "2023-04-13T10:01:55Z")
AT!PCVOLTLIMITS also result to “ERROR”… The PCI-E adapter is powered directly on USB by my computer. Even when it’s powered on USB by the Raspberry, the same problem appear (stuck on Low Power Mode) Do you know if I do something bad ? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [April 13, 2023, 10:04am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/10 "2023-04-13T10:04:33Z")
what did you see for “AT!PCVOLTLIMIOTS?” ![image](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/8/84815c81463222d9b93c516cab3541b6ef1e4417.png) ---
**Author:** ![williamxcarneiro](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@williamxcarneiro](https://forum.sierrawireless.com/u/williamxcarneiro)\ **Post date:** [April 13, 2023, 10:05am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/11 "2023-04-13T10:05:20Z")
It also return ERROR … 😕 ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [April 13, 2023, 10:06am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/12 "2023-04-13T10:06:04Z")
then maybe the adaptor has voltage problem ---
**Author:** ![williamxcarneiro](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@williamxcarneiro](https://forum.sierrawireless.com/u/williamxcarneiro)\ **Post date:** [April 13, 2023, 10:07am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/13 "2023-04-13T10:07:41Z")
My bad, I’ve past the command with your typing error LIMIOTS ^^ There is the result of AT!PCVOLTLIMITS? : HI CRIT: 3600 HI NORM: 3500 LO NORM: 3100 LO WARN: 3000 LO CRIT: 2900 ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [April 13, 2023, 10:12am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/14 "2023-04-13T10:12:04Z")
not sure if you can adjust these values to make it work you can give a try ---
**Author:** ![williamxcarneiro](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@williamxcarneiro](https://forum.sierrawireless.com/u/williamxcarneiro)\ **Post date:** [April 13, 2023, 10:14am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/15 "2023-04-13T10:14:15Z")
How can I do that ? I’m newbie in modem & first time I work with AT commands, We’re normally developer but we’re helping our customer to make its project work… ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [April 13, 2023, 10:15am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/16 "2023-04-13T10:15:26Z")
you might need to see the state diagram to adjust it ![image](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/d/dc5f0495e0136a54fde682e0b733fa3c6183d62f.png) ---
**Author:** ![williamxcarneiro](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@williamxcarneiro](https://forum.sierrawireless.com/u/williamxcarneiro)\ **Post date:** [April 13, 2023, 10:20am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/17 "2023-04-13T10:20:24Z")
Is there a way to get actual voltage ? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [April 13, 2023, 10:22am UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/18 "2023-04-13T10:22:13Z")
you need to use multimeter to measure those pins ---
**Author:** ![williamxcarneiro](https://avatars.discourse-cdn.com/v4/letter/w/47e85d/32.png) [@williamxcarneiro](https://forum.sierrawireless.com/u/williamxcarneiro)\ **Post date:** [April 13, 2023, 1:14pm UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/19 "2023-04-13T13:14:17Z")
With the AT!PCVOLT?, I get the actual voltage : Volt state: High Critical Power supply voltage: 3827 mV (148 cnt) When I try to change the voltage limit, with : AT!PCVOLTLIMITS=4000,3900,3500,3400,3300 I got error… Do you know how I can change voltage limit ? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [April 13, 2023, 1:41pm UTC](https://forum.sierrawireless.com/t/problem-with-cm7700/29514/20 "2023-04-13T13:41:14Z")
did you enter AT!ENTERCND=“A710” before entering that command? I suggest you to change the adaptor as it seems this will damage the modem. [Next page](https://forum.sierrawireless.com/t/problem-with-cm7700/29514.md?page=2)