Raytheon IDS M3-VHF-136 110W VHF BASE STATION User Manual USERS MANUAL RX IF MODULE

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Document Description	USERS MANUAL RX IF MODULE
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Date Submitted	2012-04-13 00:00:00
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Document Title	USERS MANUAL RX IF MODULE
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MM10188GV1, Rev. D
6 MAINTENANCE
6.1 MODULE DISASSEMBLY AND REASSEMBLY
Refer to the following procedures for assembly and disassembly during test. alignment and/or module
servicing.
_ The ESD symbol calls attention to procedures. practices. or the like. which could
expose equipment to the elTects of Electro-Slatie Discharge. Proper precautions must
\ be Iaken to prevent ESD when handling circuit modulesl
6.1.1 Module Disassembly
I. Use a ’l‘-I5 Torx Screwdriver and remove the six (6) ‘l‘orx screws from the top housing assembly as
shown in Figure 6-I.
2. Carefully remove the top cover. Set aside the screws and lop cover for future reassembly.
6.1.2 Module Reassembly
I. Carefully reinstall the top cover over the board as shown in Figure 6-I.
2. Reinstall the six (6) Torx screws previously removed from the top housing assembly as shown in
Figure 6- I .
Remove Screws (5 Places)
Remove Cover
Figure 6-l: Module Disnssemhly and Reassembly
23
MM101836V1, Rev. D
6.2
TROUBLESHOOTING
When troubleshooting the module, it is most convenient if the standard test fixture is used. The following
conditions are with the module in the 25 kHz mode. This can be set up using a PC with the necessary
sofiware connected to the test box. Altemntively. a wire link can be soldered between TPZOS and Tl’206
on the PC board. This forces the module to operate in the wideband (25 kHz) mode.
lF amplifier transistor 01 has a nominal 3 dB gain. Transistor 02 has a nominal gain of 8.5 dB. The
mixer has about I4 dB voltage gain with proper L0 injection. The proper crystal oscillator level is ISO
mV p-p measured at TPIOZ.
The following four test points are provided on the I’WB for additional tcst capability:
TPI: 70.7 mV p-p @ ll .4 MHz with -30 dBm input signal
TPlOZ: ISO mV p—p @ 20.945 MHz independent olinput signal
TPl031460 mV p-p @ 455 kHz with -65 dBm input signal
TPl08: 730 mV p-p @ 455 kHz with -75 dBm input signal
NOTE: All RF voltages are measured with an oscilloscope and a I0 Megohln. Ilpl’. high impedance
probe.
Table 6-I: Troubleshooting Guide
CHECK
{CORRECT READING SHOWN)
SYMPTOM
i Fault indicator Check or: voltages:
IlmoETA
INDICATES DEFECTIVE
COMPONENT
ll DC voltages not correct
°“ oav @ uzootuzos. Pin 3
U200.U206 or assoc components
rGV @ U103. Pin 14 (TP104)
U103 or associated components
1 5V @ 01 and 02 (emitters)
01 and 02 or associated components
Check for AF noise @ TP1DB. 200mV
U107 or associated components
Check forAF noise @ 02031 Pin 8: 1 v
U203 or associated components
TP3, 130 mVp-p. 20.945 MHz
demdulated
U107i Hot) or associated components
Apply -30 dBm, 21 4 MHz tnpuL cheek Wt
170 mVp-p
audio
Qt. FLI. FL2 or associated components
460 mVp-p
Apply -65 dBm, 21 4 MHz input, cheek TP103,
02. FL3. FLd. utoo. U107 or associated
components
Check crystal oscillator
TPIOQ. 130 mVp—p. 20.945 MN:
| U107. YlOO or associated components
Apply so dBm. 21.4 MHz input, check TF'1.
170 mVp-p
Apply -65 dBm. 21.4 MHz input. check TP103.
460 mVpp
Qt, FLI. FLZ. YIOO. or associated components
02, FL3. FLA. U100i U107 or associated
components
24
MM101886V1, Rev. D
7 7 cnzcx 7 7 mconazcr READING i
SYMPTOM motcnss DEFECTIVE ‘
(CORRECTREADING SHOWN} COMPONENT
N0 sflueltm With squelch pol maximum. or with module AUDIO!
function SQUELCHIHI counseled Io SQUELCH/ARM input and
with no signal to module IF input:
Check Presence oi 1 Vpk noise @ 0203. Pin 7
Check presence oi I Vpk noise U203 @ Pin 8
Chat DC voltage UZOG @ P V
Check DC voltage UZDS @ Pin 14' 0 5V
No 455 kHz | Check 0102 and U106 outpul:
‘° DSP Apply -75 dBm 21,4 MHz input, TP105, 120 NW] 010: or associated components
Apply -75 dBm 21 4 MHz input, check 12, Pins A3!
5- A32. 1.4 Vp-p
U203 or associated components
UZOS or associated components
U1OB of associated components
25
MM101886V1, Rev. D
20
TECHNICAL ASSISTANCE
The Technical Assistance Center's (TAC) resources are available to help with overall system opcration.
maintenance, upgrades and product support. TAC is the point of contact when answers are needed to
technical questions.
Product specialists, with detailed knowledge of product operation, maintenance and repair provide
technical support via a toll-free (in North American) telephone number. Support is also available through
mail. fax and e-mail.
For more information about technical assistance services. contact your sales representative, or contact the
Technical Assistance Center directly at:
Nonh America: I-800-528-77I I
International: I-434-385-2400
Fax: I-434-455-67I2
E-mail: tac QT t\'coclcctmn ics.com

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