MM101886V1, Rev. D MAINTENANCE MODULE DISASSEMBLY AND REASSEMBLY Refer to the following procedures for assembly and disassembly during test, alignment andiron module servicing. The ESD symbol calls attention to procedures, practices, or the like, which could expose equipment to the effects of Electra-Static Discharge. Proper precautions must & be taken to prevent ESD when handling circuit modules. 6.1.1 Module Disassembly 1.
MM101886V1, 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 software connected to the test box. Alternatively, a wire link can be soldered between TP203 and TP206 on the PC board. This forces the module to operate in the wide band (25 kHz) mode. IF amplifier transistor Q) has a nominal 8 dB gain.
MM101886V1, Rev. D CHECK INCORRECT READING SYMPTOM INDICATES DEFECTIVE (CORRECT READING SHOWN) COMPONENT No squelch With squelch pot maximum, or with module AUDIO! function SQUELCH/H! connected to SQUELCH/ARM input and with no signal to module IF input. ~ = Check Presence of 1 Vpk noise @ 203, Pin 1 1203 or associated components Check presence of 1 Vpk noise UZI @ Pin BJ heck Di fi 206 @ Pin voltage L208 @ 1 U206 or associated components Check DC voltage U206 @ Pin 14: 0.
MAM101886V1, Rev. D 7 26 TECHNICAL ASSISTANCE The Technical Assistance Center's (TAC) resources are available to help with overall system operation, 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.