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Covers removing PB-2086A from the transceiver, modifying the display counter board by replacing specific components (crystal, capacitors, resistors, transistor, diodes), and cleaning and soldering procedures, then assembling a conversion board linking the PIC 16F873’s 28 pins to the MSM9520RS’s 40 pins.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/msm9520rs-replacement-module-manual-v12e/563092/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/msm9520rs-replacement-module-manual-v12e/563092.png","ImageObject",300,407,{"name":92,"@type":93},"moss~","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-14","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the MSM9520RS replacement module used for in this manual?","Question",{"text":112,"@type":113},"It describes assembling, installing, and adjusting the MSM9520RS replacement module for the DISPLAY COUNTER UNIT (PB-2086A), using YAESU FT-101Z as the target transceiver.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Which component changes are required during the PB-2086A modification step?",{"text":117,"@type":113},"The manual instructs replacing the X01 crystal (6.5536MHz to 20.000MHz), adjusting C25 (47pF to 22pF), and replacing several resistors and the transistor Q03 (2SC1674L to 2SC3605), plus removing diodes D05 and D09 and potentially replacing others if the cathode marking is “white”.",{"name":119,"@type":110,"acceptedAnswer":120},"How does the manual guide conversion board assembly between the PIC 16F873 and MSM9520RS?",{"text":121,"@type":113},"It directs identifying the TOP/BOTTOM sides and the #1 pin positions, then assembling and soldering specified parts on the TOP side and placing a 40-pin DIP pin-header on the BOTTOM side, including checks for solder bridges and short circuits before final installation.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},563092,1791922367,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},962090895452,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","FT-101Z/ FT-107/ FT-707/ FT-901,902 (later version)  \nDISPLAY COUNTER UNIT (PB-2086A) Custom Integrated Circuit (MSM9520RS)  \nReplacement Module  \nAssembly and Installation Manual (v1.2e)  \nMSM9520RS Replacement Module Manual v1.2e  \nSTEP-BY-STEP PROCEDURES  \nThis manual describes how to assemble, install and make adjustments of the MSM9520RS replacement module using YAESU FT-101Z as the target transceiver. Most of the procedure described here can be directly applicable to other YAESU transceiver models: FT-107, FT-707 and FT-901,902 (later version only) as long as the MSM9520RS is used in their DISPLAY COUNTER UNIT (PB-2086A). Please refer to the last section of this manual for the differences among models.  \n(Step 1) Remove DISPLAY COUNTER UNIT (PB-2086A) from transceiver.  \n􀂄 PB-2086A is the printed circuit board mounted on the top ofVFO box.  \n􀂄 Detach all the connectors connected to the board. (3 connectors) Pull off the 3-pin connector connecting to the 5V regulator IC on the back. Disconnect the RCA input plug from the PRE-MIX UNIT.  \n􀂄 Detach the black ground wire connection by loosing one of mounting screws of the PRE-MIX UNIT.  \n􀂄 No unsoldering is needed at this point.  \n􀂄 Make sure not to lose any of washers and screws. Pay special attention to the plastic screws used for the 2 of front side mounting screws of the board and isolating washer located under the board.  \n(Step 2) Modify DISPLAY COUNTER UNIT (PB-2086A) .  \nThis modification is necessary to increase the input signal amplitude to the counter so that a general-purpose microcontroller chip can be used in the place of a dedicated frequency counter chip.  \n􀂄 Remove the nonfunctional MSM9520RS by unsoldering 40 pins with unsoldering wires (SOLDER-WICK) or a vacuum unsoldering gun. Then make necessary modifications of the board described below:  \n1) Replace X01 6.5536MHz crystal with 20.000MHz crystal.  \n2) Replace C25 47pF (Other value may have been used.) with 22pF.  \n3) Replace R16 100 kΩ with 4.7 kΩ .  \n4) Replace R11 220 Ω with 33 Ω.  \n5) Replace R10 220 Ω with 390 Ω.  \n6) Replace Q03 2SC1674L with 2SC3605.  \nThe pin ordering of 2SC3605 is different from 2SC1674L! Refer to Fig. 3 for the pin  \nMSM9520RS Replacement Module Manual v1.2e  \nordering.  \n7) Remove  \nD05 1S1555, D09 1S1555.  \n􀂄 If the cathode marking of D01 1S1555 and D02 1S1555 happens to be “white”, these diodes need tobe replaced. (Diodes are included in this kit.) Refer to the troubleshooting section [ 2) Miscounting at Higher Band ] of this manual.  \n􀂄 Please refer to Fig. 1 and Fig. 2 for the locations of the modification on the schematic diagram and the picture of the board.  \nModifications  \nFig. 1  \nDISPLAY COUNTER UNIT  \n2) Replace C25 47pF (Other value may have been used.) with 22pF.  \n1) Replace X01 6.5536MHz crystal with 20.000MHz crystal.  \n3) Replace R16 100 kΩ with 4.7 kΩ .  \n4) Replace R11 220 Ω with 33 Ω.  \n6) Replace Q03 2SC1674L with 2SC3605. (Attention:  \n5) Replace R10 220 Ω with 390 Ω.  \nBEC  \nPin Ordering!)  \nPay attention to Cathode Making!  \n7) Remove D05 1S1555, D09 1S1555.  \nMSM9520RS Replacement Module Manual v1.2e  \n5) R10 7) D05, D09  \n6) Q3  \n3) R16   \n1) X01 2) C25  \n4) R11  \nFig. 2 Location of the Parts to be Replaced/ Removed  \nE C B  \n2SC1674L  \nB E C  \n2SC3605  \nFig. 3 2SC1674L and 2SC3605 Pin Ordering  \nMSM9520RS Replacement Module Manual v1.2e  \nNote:  \n- After unsoldering parts, or replacing parts, clean thoroughly the surface of the foil/ solder side of the board with cotton buds damped with solvent.  \n(Step 3) Assemble the conversion board, which connects the 28 pins of PIC 16F873 microcontroller to the 40 pins of the MSM9520RS counter chip.  \n􀂄 Spend a while to determine the “sides”(TOP or BOTTOM) of the conversion board and the location of the \\#1 pin for the integrated circuit referring to Fig. 4.  \n\\#1 pin of PIC 16F873  \nTOP (Parts) Side  \n\\#1 pin ofMSM9520RS  \nBOTTOM Side (Pattern is seen through from the TOP side)  \nFig. 4 Patterns of the Conversio","cbCaikBY71b195eS","https://ap.wps.com/l/cbCaikBY71b195eS","pdf",236430,13,"English","# Step-by-step Procedures\n## Step 1: Remove DISPLAY COUNTER UNIT (PB-2086A)\n## Step 2: Modify DISPLAY COUNTER UNIT (PB-2086A)\n## Modifications (parts replacement locations)\n## Step 3: Assemble the conversion board","[{\"question\":\"What is the MSM9520RS replacement module used for in this manual?\",\"answer\":\"It describes assembling, installing, and adjusting the MSM9520RS replacement module for the DISPLAY COUNTER UNIT (PB-2086A), using YAESU FT-101Z as the target transceiver.\"},{\"question\":\"Which component changes are required during the PB-2086A modification step?\",\"answer\":\"The manual instructs replacing the X01 crystal (6.5536MHz to 20.000MHz), adjusting C25 (47pF to 22pF), and replacing several resistors and the transistor Q03 (2SC1674L to 2SC3605), plus removing diodes D05 and D09 and potentially replacing others if the cathode marking is “white”.\"},{\"question\":\"How does the manual guide conversion board assembly between the PIC 16F873 and MSM9520RS?\",\"answer\":\"It directs identifying the TOP/BOTTOM sides and the #1 pin positions, then assembling and soldering specified parts on the TOP side and placing a 40-pin DIP pin-header on the BOTTOM side, including checks for solder bridges and short circuits before final installation.\"}]","MSM9520RS Replacement Module Manual - v1.2e | PDF",1791810521,33]