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After Sales
Technical Documentation
RAE/RAK–1N
Faultfinding/Disassembly
Page 8 – 15
Original, 05/97
1.1.1.3
Undervoltage lockout removed?
This UVLO is made as hardware limit to shut down Vsys if battery voltage
drops below 5.0V. When the N82 comparator controlling N81 has
worked the shutdown of Vsys is cancelled only after battery voltage
rises over 6.0V! It is possible to test PDA module at voltages between
5.0V and 6.0V but wakeup of Vsys requires voltage higher than 6.0V. This
hysteresis is put to design to prevent oscillation at low battery voltages
after battery cutoff limit is reached and battery voltage rises after its load is
removed.
If battery voltage is higher than 6.0V, battery voltage (nearly) should be
seen at regulator N81 pin 1. If not go to 1.1.1.4.
1.1.1.4
UVLO fault
First check that 4.1V can be measured from reference V84 cathode. If not
replace V84 and check R88. Next check that voltage between R87 and
R89 is higher than voltage across V84. This voltage should be reduced to
V84 voltage level if battery voltage is reduces to 5.0V. If not check R87,
R89 and R65.
If above mentioned is OK check R80. If OK replace N82.
1.1.1.5
Vsys OK?
Measure Vsys voltage for example from C84 positive terminal. It should
be between 3.135V and 3.465V. If not go to 1.1.1.6.
1.1.1.6
Check Vsys regulator
First check that battery voltage is seen at N81 pins 3 and 8. If pin 3 is low
regulator does not exit from ’soft start’ state.
1.1.1.7
Is N81 pin 7 toggling?
If measured with oscilloscope there should be seen voltage level toggling
between 0V and VBatt at frequency of about 200kHz. If not go to 1.1.1.8.
Otherwise go to 1.1.1.9. If the regulator has dropped to a shutdown state
the pulse frequency is lower and pulses appear at irregular time intervals.
1.1.1.8
Vsys controller fault
Replace N81.
1.1.1.9
Check V88, L82, C84
If the controller N81 tries to alternate pin 7 level, even at reduced voltage
magnitude the fault is very likely found from V88, L82 or C84. If the
problem is still unsolved check that Vsys current consumption is less than
500mA. Reasonable value is about 200mA when CPU is fully on. If not
there must be a short circuit in Vsys line.
Summary of Contents for 9000i
Page 7: ...After Sales Technical Documentation RAE RAK 1N Series Original 08 96 Chapter 1 Overview ...
Page 287: ...After Sales Technical Documentation RAE RAK 1N Series Original 08 96 Chapter 9 Service Tools ...
Page 301: ...After Sales Technical Documentation RAE 1N Series Original 04 97 Chapter 10 Schematics ...
Page 303: ...RAE 1N Original 08 96 10 11 Page 1 Figure 1 Component Layout Bottom ...
Page 304: ...RAE 1N Original 08 96 10 12 Page Figure 2 Component Layout Top ...
Page 305: ...RAE 1N Original 08 96 10 13 Page Figure 3 Baseband Circuit Diagram PWRU ...
Page 306: ...RAE 1N Original 08 96 10 14 Page Figure 4 Baseband Circuit Diagram MCM1 ...
Page 307: ...RAE 1N Original 08 96 10 15 Page Figure 5 Baseband Circuit Diagram MCM2 ...
Page 308: ...RAE 1N Original 08 96 10 16 Page Figure 6 RF TX Circuit Diagram ...
Page 309: ...RAE 1N Original 08 96 10 17 Page Figure 7 RF RX Circuit Diagram ...
Page 310: ...RAK 1N 10 20 Page Amendment 1 04 97 Figure 18 PCN Component Layout Bottom ...
Page 311: ...RAK 1N 10 21 Page Amendment 1 04 97 Figure 19 PCN Component Layout Top ...
Page 312: ...RAK 1N 10 22 Page Amendment 1 04 97 Figure 20 PCN RF TX ...
Page 313: ...RAK 1N 10 23 Page Amendment 1 04 97 Figure 21 PCN RF RX ...
Page 314: ...RAK 1N 10 24 Page Amendment 1 04 97 Figure 22 UIF Schematic PCN ...
Page 315: ...RAK 1N 10 25 Page Amendment 1 04 97 Figure 23 UIF Component Layout PCN ...
Page 316: ...RAE 1N Original 05 97 10 3 Page Figure 1 PDA Block Diagram Edit 82 for layout 13a ...
Page 317: ...RAE 1N Original 05 97 10 4 Page Figure 2 PDA Power Unit PWRU Edit 108 for layout 13a ...
Page 318: ...RAE 1N Original 05 97 10 5 Page Figure 3 PDA Serial Interface SIRU Edit 24 for layout 13a ...
Page 319: ...RAE 1N Original 05 97 10 6 Page Figure 4 PDA MCU and Memory PROCU Edit 121 for layout 13a ...
Page 320: ...RAE 1N Original 05 97 10 7 Page Figure 5 PDA EMIU Edit 21 for layout 13a ...
Page 321: ...RAE 1N Original 05 97 10 8 Page Figure 6 Keyboard matrix Edit 24 for layout 13a ...
Page 322: ...RAE 1N Original 05 97 10 9 Page Figure 7 PDA Memory Edit 28 for layout 13a ...
Page 323: ...RAE 1N Original 05 97 10 10 Page Figure 8 PDA Component Layout 13a ...
Page 324: ...RAE 1N Original 08 96 10 18 Page Figure 1 UIF Schematic ...
Page 325: ...RAE 1N Original 08 96 10 19 Page Figure 2 Component Layout Uif ...
Page 326: ...After Sales Technical Documentation RAE RAK 1N Series Original 08 96 Accessories ...
Page 352: ...After Sales Technical Documentation Appendix 2 RAE RAK 1N Amendment 1 04 97 PARTS LISTS ...
Page 402: ...After Sales Technical Documentation Appendix 1 RAE RAK 1N Original 08 96 QUICK GUIDE ...
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