Bulletin: SP4000
Vendor:   AZDEN
Subject:  PCS-4000 UNLOCK FIX

THE PROBLEM WITH THUNLOCK ON THE AZDEN PCS-4000 IS CAUSED BY BAD SOLDER
JOINTS UNDER THE VCO. TO FIX THIS PROBLEM REMOVE THE COVER FROM THE TOP OF THE
PCS-4000. THE VCO IS LOCATED UNDER THE METAL BOX LOCATED FRONT AND CENTER OF
THE BOARD. THE BAD SOLDER JOINTS ARE LOCATED ON THE BOTTOM SIDE OF THE BOARD
WHERE THE METAL TABS ARE SOLDERED HOLDING THIS BOX DOWN. CAREFULLY DESOLDER
HE RED WIRE FROM THE POST MARKED +9 VOLTS TO THE LEFT OF THE VCO COIL SHIELD
BOX. THE TONE BOARD IS ALSO IN THIS LOCATION. (IF IT'S INSTALLED) NOW UNPLUG
ALL CONNECTORS ON THE BOARD INCLUDING THE 2 COAX CONNETORS. (THEY PULL STRIGHT
OUT FROM THE FEMALE SIDE). YOU WILL FIND THAT THERE IS STILL ONE WIRE LEFT
CONNECTED TO THE BOARD. THIS WIRE CAN BE LEFT IN PLACE AND THE BOARD ROTATED
UP AND BACK EXPOSING THE BACK SIDE OF THE BOARD. REMOVE ALL SCREWS HOLDING
THE BOARD DOWN AND CAREFULLY LIFT IT UP AND OVER TO THE BACK. NOW ROTATE THE
ENTIRE RIG SO THE BOTTOM OF THE VCO COIL SHIELD BOX TABS ARE EXPOSED. REMOVE
ALL SOLDER FROM THE TABS. THIS SOLDER HAS WAX FROM THE COIL BOX CONTAMINING
IT AND MUST BE REMOVED. CLEAN TABS AND THE AREA OF THE BOARD WHERE THE TABS
ARE SOLDERED  WITH A GOOD CLEANING SOLDER FLUX. RESOLDER THE TABS TO THE
BOARD AFTER BENDING THE TABS DOWN AND MAKING A GOOD CONTACT WITH THE BOARD.
ROTATE ENTIRE RADIO AND SWING BOARD BACK INTO PLACE. REPLACE SCREWS THAT HOLD
BOARD IN PLACE AND PLACE A DROP OF SUPER GLUE TO THE SCREWS WHERE THE SCREW
AND BOARD MEET TO KEEP THESE SCREWS FROM VIBRATING OUT. (DO NOT GET GLUE
INTO SCREW DRIVER SLOT! YOU MIGHT ONE DAY NEED TO REMOVE THIS BOARD AGAIN!)
PLUG ALL CONNECTORS BACK INTO THERE RESPECTIVE PLUGS. REPLACE RED WIRE ON POST
MARKED +9 VOLTS AND SOLDER. REPLACE TOP COVER ON AZDE PCS-4000 AND TEST RADIO
BY CONNECTING TO + 12 VOLT POWER SOURCE AND TO A PROPER ANTENNA. TURN RADIO
ON AND CHANGE FREQUENCY TO ENSHURE THAT THE UNLOCK LED DOES NOT STAY
ON AFTER A FREQUENCY CHANGE. LEAVE RADIO ON TO ALLOW IT TO WARM UP AND KEEP
A CHECK ON THE UNLOCK LED THAT IT DOES NOT COME ON WHILE LOCKED ON ONE
FREQUENCY.