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Agilent E7495 linux root account

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kirill_ka:

--- Quote from: ncfireman on August 02, 2018, 01:58:52 am ---Has anyone had any luck using either the serial ports or gpio?  I was hoping to get it to spit out useful data on the serial port.

--- End quote ---
There should be no problem accessing serial port from inside of E7495. What kind of data are you going to spit out?

ncfireman:
I'd like to be able to export gps and an average signal level.  Something where I could do a rough drive test.

9aplus:
Today during the boot my E7495B stopped to work. The unit was couple months in storage
during the whole summer.
The trouble is localized within PS DC/DC picture with model details in attachment.

Looking for that module, designated in service manual like:
Power supply interface board A4A4
or whole unit E7495 for parts....
PM pls, located within EU

kirill_ka:

--- Quote from: 9aplus on November 22, 2018, 06:52:28 pm ---The trouble is localized within PS DC/DC picture with model details in attachment.

--- End quote ---
My E7495A refused to work on battery. Now I regret that I dig into this. It took so much time...
The issue that was looking like a component failure appeared to be a pure software thing.
There is some SMBUS/Smart battery ugliness. Anyway, now I know quite a lot about this module.
I can help with diagnostics and repair.

kirill_ka:
Here's PIC16F877 pin map to start with. It's not complete and may have some mistakes, but it's at least something.


--- Code: ---P/N     NAME    DIR     FUNCTION                                        CONNECTIONS
 1      RC7     I       UART RX                                         J10/5
 2      RD4     O       BATT LED                                        U10
 3      RD5     O       BATT LED                                        U10
 4      RD6     O       BATT LED                                        U10
 5      RD7     O       BATT LED                                        U10
 6      VSS     -
 7      VDD     +
 8      RB0     I       LOBAT(LOW)
 9      RB1     O       3DM(LOW)
10      RB2     O       DCIN (HI)
11      RB3     O       PWR ON LED                                      J20/10
12      NC      x
13      NC      x
14      RB4     I       START OF BATTERY MONITORING?                    J52/4, R96
15      RB5     O       BATDIS(LOW)
16      RB6     O       SUSPEND to ADS?                                 J6/1, J55/2
17      RB7     O       STBY PWR ON (LOW), STDBY LED (LOW)              U101, U11 - J20/7
18      RST     R
19      RA0     A       BATT TEMP
20      RA1     A       BATT TEMP
21      RA2     O       BATT TEMP STROBE
22      RA3     I       CONFIG JUMPER                                   J11/1
23      RA4     I       DCIN DETECT                                     U1
24      RA5     O       BATT TEMP STROBE
25      RE0     A       3.3V SENSE                                      100K - J5/5,6
26      RE1     I       PWR SW                                          U203, J20/9
27      RE2     I       ADS POWER DETECT
28      VDD     +
29      VSS     -
30      X1      C       4MHz clock in                                   U100
31      X2      I       NOT USED
32      RC0     O       CHARGER OFF                                     100K - CR4, Q13 - Q12 - U8/2
33      NC      x
34      NC      x
35      RC1     O       adjusts PROG A of U7                            Q11 - 10K - U7/1
36      RC2     O       charger output voltage setting                  Q14 - ?K - U8/6(Vosense)
37      RC3     I/O     SCL                                             Q20, J52/3
38      RD0     O       CHGSEL
39      RD1     I       BACKLIGHT DISABLE? (NOT USED)                   100K to Q7, GND
40      RD2     O       BATSEL
41      RD3     O       MAIN POWER ON                                   18K to J5/10
42      RC4     I/O     SDA                                             Q16, J52/2
43      RC5     O       I2C BATT MULTIPLEX                              U13
44      RC6     O       UART TX                                         J10/3


Q16, Q19, Q7 = NPN MMBT3904 1AM
B
 C
E

PNP MMB3906 2A
B
 C
E

n-MOS 2N7002 702P

G
 D
S



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