Yorkville Sound 3400 service manual Quiescent Condition, The Second Tier

Contents HIGH EFFICIENCY STEREO POWER AMPLIFIER 3400Quality and Innovation Since CANADAIMPORTANT SAFETY INSTRUCTIONS Power SourcesREFER SERVICING TO QUALIFIED SERVICE PERSONNEL Power CordVOLTAGE AMPLIFIER CIRCUIT DESCRIPTIONSHUTDOWN CIRCUIT CIRCUIT DESCRIPTIONQUIESCENT CONDITION THE SECOND TIERDC Protection Current Limit Protection CircuitryConditions of test EMS Circuit Fan CircuitThermal Shutdown Circuit Identifying Defective Boards in the AP-3400SPECIFICATIONS STEP 3 POWER UP PROCEDURE WITHOUT M1002A BOARDSSTEP 4 DISMANTLING AND REASSEMBLY PRECAUTIONS POWERSTEP 3 POWER UP PROCEDURE WITHOUT M1002 BOARDS STEP 4 DISMANTLING AND REASSEMBLY PRECAUTIONSAP3400 Parts List 10/28/98 STEP 1 VISUAL INSPECTION OF FRONT PANEL AND FANM1002A.SCH DATABASE HISTORY M1011A.SCH DATABASE HISTORYM1013A.SCH DATABASE HISTORY M1011A.SCH DATABASE HISTORY MODELS - AP-3400DATE VER# DESCRIPTION OF CHANGEM1011A MS2BOTTOMBAMPSHEAR SHEARM1011A M1011A.PCB DATABASE HISTORYRIGHT = CHAN B LEFT = CHAN AC8M1012 M1012SHEAR SHEARMJH11018 MPSA062N5551 B C EMJH11018 2N5551MPSA06 B C EM1013A AP-3400COPPER OZ SHEAR5WATT M1002A AP-3400@R55WATT Testing Repaired Circuit Board Quick Fix for M1002 and M1002A AP3000 AND AP3400 SERVICEYORKVILLE SOUND the M1002 or M1002A circuit board to be serviced If the M1002A AP-3400SHEAR CHECKSHOWN WIRED FOR AP-3400CEXFMR WIRING NOV#1289 A C - W H I T ESHOWN WIRED FOR AP-3400CEXFMR WIRING NOV#1289 A C - W H I T E