SB-919 R-5000 No Freq. Change thru Computer Interface 7-21-87 R-5000 receivers below serial number 804xxxx may not change frequency when operated with a personal computer/interface. To allow correct operation, rplace IC-52 on the Control Unit. The correct part number for IC-52 is MBM27C128-25JA2. CAUTION: The R-5000 incorporates CMOS technology. Observe precautions for handling electrostatic sensitive devices. This modification may be performed under warranty. Time required for this change is 1/2 hour or less. (c) 121589TKC