STM32F407，PWM管脚不正常，请指教

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STM32F407，PWM管脚（PE8-PE13）没有输出时候，用万用表量是2V多，用示波器是0V，输出经过两级74HC04D，第一级按示波器0V，输出还是0V，第二级正常，代码如下，请高手指点

        GPIO_InitTypeDef GPIO_InitStructure;
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;
        TIM_BDTRInitTypeDef TIM_BDTRInitStruct;
        NVIC_InitTypeDef NVIC_InitStructure;
        //RCC
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
       
       
        GPIO_PinAFConfig(GPIOE, GPIO_PinSource8, GPIO_AF_TIM1);
        GPIO_PinAFConfig(GPIOE, GPIO_PinSource9, GPIO_AF_TIM1);
        GPIO_PinAFConfig(GPIOE, GPIO_PinSource10, GPIO_AF_TIM1);
        GPIO_PinAFConfig(GPIOE, GPIO_PinSource11, GPIO_AF_TIM1);
        GPIO_PinAFConfig(GPIOE, GPIO_PinSource12, GPIO_AF_TIM1);
        GPIO_PinAFConfig(GPIOE, GPIO_PinSource13, GPIO_AF_TIM1);        
        GPIO_PinAFConfig(GPIOE, GPIO_PinSource15, GPIO_AF_TIM1);
       
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9| GPIO_Pin_10| GPIO_Pin_11| GPIO_Pin_12| GPIO_Pin_13;
       
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
        GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
        GPIO_Init(GPIOE, &GPIO_InitStructure);          
       



        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
        GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
        GPIO_Init(GPIOE, &GPIO_InitStructure);
        //TIM
        TIM_TimeBaseStructure.TIM_Period = ZDM_TIM_PERIOD;
          TIM_TimeBaseStructure.TIM_Prescaler = 3;
          TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
          TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseStructure.TIM_RepetitionCounter=0;
         TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
//  
//        TIM_InternalClockConfig(TIM1);

       
        TIM_SelectCOM(TIM1,ENABLE);
        TIM_SelectSlaveMode(TIM1,TIM_SlaveMode_Trigger);
        TIM_SelectInputTrigger(TIM1,TIM_TS_ITR3);
       
        TIM_ITConfig(  TIM1, TIM_IT_COM, ENABLE);
       
        NVIC_InitStructure.NVIC_IRQChannel = TIM1_TRG_COM_TIM11_IRQn;
       
         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;      
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  
        NVIC_Init(&NVIC_InitStructure);  
       
        //Dead zone
        TIM_BDTRInitStruct.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
        TIM_BDTRInitStruct.TIM_Break = TIM_Break_Enable;
        TIM_BDTRInitStruct.TIM_DeadTime = 0;
        TIM_BDTRInitStruct.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
        TIM_BDTRInitStruct.TIM_OSSIState = TIM_OSSIState_Enable;
        TIM_BDTRInitStruct.TIM_OSSRState = TIM_OSSRState_Enable;
        TIM_BDTRInitStruct.TIM_BreakPolarity = TIM_BreakPolarity_Low;
        TIM_BDTRConfig(TIM1,&TIM_BDTRInitStruct);
//       
        TIM_ITConfig(  TIM1, TIM_IT_Break, ENABLE);
       
        NVIC_InitStructure.NVIC_IRQChannel = TIM1_BRK_TIM9_IRQn;
       
          NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;      
          NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  
         NVIC_Init(&NVIC_InitStructure);  

       
  // PWM Mode configuration
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
        TIM_OCInitStructure.TIM_OCIdleState=TIM_OCIdleState_Set;
        TIM_OCInitStructure.TIM_OCNIdleState=TIM_OCNIdleState_Set;
       
         TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
        TIM_OCInitStructure.TIM_OutputNState = TIM_OutputState_Enable;
          TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
        TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_High;
        TIM_OCInitStructure.TIM_Pulse = 1000;
  
         TIM_OC1Init(TIM1, &TIM_OCInitStructure);
        TIM_OC2Init(TIM1, &TIM_OCInitStructure);
        TIM_OC3Init(TIM1, &TIM_OCInitStructure);
  
          TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
        TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
        TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);
   
         TIM_ARRPreloadConfig(TIM1, ENABLE);
  
  

       
        TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);
        TIM_CCxNCmd(TIM1, TIM_Channel_1, TIM_CCxN_Disable);
       
        TIM_CCxCmd(TIM1, TIM_Channel_2, TIM_CCx_Disable);
        TIM_CCxNCmd(TIM1, TIM_Channel_2, TIM_CCxN_Disable);
       
        TIM_CCxCmd(TIM1, TIM_Channel_3, TIM_CCx_Disable);
        TIM_CCxNCmd(TIM1, TIM_Channel_3, TIM_CCxN_Disable);
//       
        TIM_CtrlPWMOutputs(TIM1, ENABLE);
  
          TIM_Cmd(TIM1, ENABLE);