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AE/LZB 119 1647 R1A
33
Symptom
Probable Cause
Corrective Action
Low or no transmitting
power.
(TX LED illuminated)
1. P.A. control signal error.
2. P.A. ramp signal error.
3. Transmit tracking data is corrupt.
4. Defective power module (U103).
5. Defective antenna switch (U102).
6. Defective APC circuit (U104B,
D102, etc.)
1. Base of Q111 should be low during transmit if
not the problem is on the digital board.
2. J108 pin 7 should be 1-5 Vdc. If not the problem
is on the digital board. If voltage is present the
problem may be with U104A.
3. Check tracking data by using Maint2 program.
4. Refer to voltage chart.
5. Voltage at pin 4 of U102 should be 5 Vdc.
6. Voltage at U104 pin 7 should be 1-5 Vdc during
transmit. If not there is an APC problem.
No internal or external
microphone modulation.
1. Bad internal or external mic.
2. Defective internal/external mic
switch (Q102, R125, etc.)
3. Voice modulation tracking data is
corrupt.
4. Defective ASP.
1. Replace defective microphone.
2. Replace defective component.
3. Check that tracking data is valid by using
Maint2 program.
4. If voice signal is present at U804 pin 74, but not
at pin 60 replace ASP or entire digital board.
No data modulation or poor
modulation balance.
1. RV101 mis adjusted.
2. Defective Walsh-bit resistor.
R741, 742 (low-speed data).
3. Data modulation tracking data is
corrupt.
4. Defective ASP.
5. Defective Modem IC (high-speed
data).
6. Defective CPU.
1. Re-adjust “eye pattern”
2. Check for Walsh-bit resistor data throughput.
3. Check that tracking data is valid by using
Maint2 program.
4. Check for ASP data throughput. For example,
data input is pin 80 output is pin 60.
5. Look for TX data on U702 pin 25. If data is not
present replace modem or entire digital board.
6. Lood for data on appropriate pin (14 for Walsh-
bit 1, 27 for busy tone, etc.). If not present replace
CPU or entire digital board.
No data or voice
modulation.
1. Defective modulation amplifier
(U301A, R310, etc.).
2. Bad connection from Digital to
RF board.
3. Defective VCO.
1. If a good modulation signal is present at pin 60
of ASP but not at pin 1 of U301 the amplifier is
malfunctioning. Replace bad component.
2. If a modulation signal is present at pin 1 of
U301, but is not present on RF board make sure
interconnect pins are seated tightly.
3. Modulation signal is present at VCO mod pin
but transmitter is not modulated. Replace VCO.
Radio will not “FLASH”
program.
1. Equipment connection error.
2. Programming voltage error.
3. U701 pins 9&56 voltage error.
4. RX data path is open.
5. Defective serial number ROM
(U706).
6. Defective CPU.
7. Defective FLASH chip.
1. Double check equipment connections.
2. Power supply voltage must be 11.5-12.5Vdc.
3. Compare with voltage chart.
4. Check for data at U601 pin 7. If data is not
present problem is in this circuit or there is an open
at J104.
5. Replace U706.
6. Replace CPU or digital board.
7. Replace FLASH chip or digital board.
Personality programming
error.
1. Equipment connection error.
2. RX data path is open.
3. Defective EEPROM (U104).
4. Defective CPU.
1. Double check equipment connections.
2. Check for data at U601 pin 7. If data is not
present problem is in this circuit or there is an open
at J104.
3. Replace U104 or keypad board.
4. Replace CPU or digital board.
Содержание EDACS Monogram Series
Страница 1: ...ericssonz ericssonz Maintenance Manual MONOGRAM SERIES EDACS Trunking Portable 800 MHz ...
Страница 45: ...AE LZB 119 1647 R1A 45 COMPONENT PINOUT 780 202 0009 Sh 1 Rev A ...
Страница 46: ...AE LZB119 1647 R1A 46 COMPONENT PINOUT 780 202 0009 Sh 2 Rev A ...
Страница 47: ...AE LZB 119 1647 R1A 47 SYSTEM WIRING DIAGRAM 930 010 0002 Rev A ...
Страница 48: ...AE LZB119 1647 R1A SERVICE OUTLINE 48 KEYPAD DISPLAY BOARD 930 010 0002 Rev A ...
Страница 49: ...SCHEMATIC DIAGRAM AE LZB 119 1647 R1A 49 PTT SWITCH BOARD 650 180 0001 S1800001 Rev A ...
Страница 50: ...AE LZB119 1647 R1A SCHEMATIC DIAGRAM 50 KEYPAD DISPLAY BOARD 650 170 0001 S1700001 Rev A ...
Страница 51: ...RF BOARD 650 020 0002 770 020 0002 Rev D AE LZB 119 1647 R1A 51 ...
Страница 52: ...DIGITAL BOARD 650 010 0003 770 010 0003 Sh 1 Rev E AE LZB 119 1647 R1A 52 ...
Страница 53: ...DIGITAL BOARD 650 010 0003 770 010 0003 Sh 2 Rev E AE LZB 119 1647 R1A 53 ...
Страница 54: ...BLOCK DIAGRAM 060 010 0001 Rev B AE LZB 119 1647 R1A 54 ...
Страница 55: ...This page intentionally left blank AE LZB 119 1647 R1A 55 ...