Kenwood DPX701 Service Manual

Also see for DPX-MP7090U: Instruction manual

Contents

21DPX701/701U/701UYDPX-MP7090UDC OFFSET ERROR● PurposePrevent customers’ vehicle speakers damages, burnouts, andsmoking.Avoid the connected speakers to be burned out, damaged, orto smoke when DC occurs between the audio power amp. +and - outputs.● Processing after detection1. System status• At the detection of DC error, error data is to be saved im-mediately (E2PROM error log save area).• Display the error message on the display. The system shallmaintain the current condition, including the operation. Shutdown audio system power supply. Set Mute to ON.• Although switching between Power OFF and ON (ACC, BU,and Key operation) is valid, switching from Off to ON shallbe error until the μ-com is reset.∗ While power-on, even if the IC2VI DCErr output terminallogic recovered to normal level value, the error conditionshall continue.• Prohibit to save the backup/installer memory to E2PROM(nonvolatile memory).2. Controlling μ-com terminal• Set Mute for all channels including for pre-out.• Turn off power IC control system power supply. (Set AMP-Standby function to valid)• Set P-Con output to OFF (Logic by which external AMPunit is turned off).∗ The purpose is to shut down audio output. Basically, thelogic sets the audio output system signal line when inStandby source.3. Key specification• No specific limitation (Normal operation).4. Display specification• Display the “PROTECT” string and blink all characters at1Hz.∗ Use the indication below with the highest priority (error mes-sage), and maintain the error message even when thesource is changed.● Cancel Condition• Press the Reset terminal on the main body. or set Backupto OFF (Unplug and plug back in the DC connector).The history is maintained (E2PROM data is saved).● Note while in test mode• While in test mode, even if DC leak is detected, it is notwritten into E2PROM.When an error is detected, the display is enabled.● Other• Function for checking and clearing data in E2PROM by agiven key shall be included.(Used at production dpt. and service center, etc.)Display ExamplePROTECTBlink alternatelyat 1Hz((CD LOAD ERROR DETECTION● OverviewRecord the number of times when mechanism error (SW er-ror) occurred at CD LOAD.LOAD error recording shall be done in 2 patterns, by the SWstatus illustrated below.LOAD error is established when LOAD operation is not com-pleted after LOAD operation is started before the protect timercount is completed.Clearing of record is done in the following situations:1) After reset is cancelled, when reading EEPROM, the codeis NG.2) While in test mode, the specified key (Play/Pause keypressed for 2 seconds) input.3) When in EEPROM all-clear initialization mode (refer tothe test mode specification document)• Display is shown on the test mode specification document.• Number of times with error(s) is 99 at MAX.• Not recorded in test mode [1+3 keys].