diff --git a/src/ble/ble_service.c b/src/ble/ble_service.c
index 85ab69d..7330282 100644
--- a/src/ble/ble_service.c
+++ b/src/ble/ble_service.c
@@ -408,13 +408,13 @@ static void adv_restart_handler(struct k_work *work)
 
     if (advertising_restart_suspended)
     {
-        DBG_CORE("[BLE] Advertising restart skipped (suspended)\r\n");
+        DBG_PRINTF("[BLE] Advertising restart skipped (suspended)\r\n");
         return;
     }
 
     if ((current_conn != NULL) || ble_connection_st)
     {
-        DBG_CORE("[BLE] Advertising restart skipped (connected)\r\n");
+        DBG_PRINTF("[BLE] Advertising restart skipped (connected)\r\n");
         return;
     }
 
@@ -608,7 +608,7 @@ static void connected(struct bt_conn *conn, uint8_t err)
         (void)bt_conn_disconnect(conn, BT_HCI_ERR_AUTH_FAIL);
         return;
     }
-    DBG_CORE("[BLE] Security requested level=%u\r\n", BLE_REQUIRED_SECURITY_LEVEL);
+    DBG_PRINTF("[BLE] Security requested level=%u\r\n", BLE_REQUIRED_SECURITY_LEVEL);
 #endif
 
     DBG_CORE("[BLE] Connected\r\n");
diff --git a/src/ble/ble_tx_power.c b/src/ble/ble_tx_power.c
index 20229ff..6d8a2d7 100644
--- a/src/ble/ble_tx_power.c
+++ b/src/ble/ble_tx_power.c
@@ -75,7 +75,7 @@ static int ble_tx_power_write(uint8_t handle_type, uint16_t handle, int8_t dbm,
         {
             current_tx_power_dbm = rp->selected_tx_power;
         }
-        DBG_CORE("[BLE] TX power %d dBm reason=%s\r\n", rp->selected_tx_power, reason);
+        DBG_PRINTF("[BLE] TX power %d dBm reason=%s\r\n", rp->selected_tx_power, reason);
     }
 
     net_buf_unref(rsp);
@@ -281,11 +281,11 @@ void ble_tx_power_on_connected(struct bt_conn *conn)
 
     if (txp_ret == 0)
     {
-        DBG_CORE("[BLE] TX power (current) = %d dBm\r\n", cur_txp);
+        DBG_PRINTF("[BLE] TX power (current) = %d dBm\r\n", cur_txp);
     }
     else
     {
-        DBG_CORE("[BLE] TX power read fail ret=%d\r\n", txp_ret);
+        DBG_ERR("[BLE] TX power read fail ret=%d\r\n", txp_ret);
     }
 
     if (BLE_RSSI_MONITOR_ENABLED)
diff --git a/src/command/handlers/cmd_piezo.c b/src/command/handlers/cmd_piezo.c
index 444a214..6fdc2fe 100644
--- a/src/command/handlers/cmd_piezo.c
+++ b/src/command/handlers/cmd_piezo.c
@@ -193,6 +193,7 @@ int cmd_mtb(const uint8_t *data, uint8_t data_len)
 }
 
 /*
+ * 측정 파라미터 읽기
  * mcf?: piezo measurement parameter read
  */
 int cmd_mcf(const uint8_t *data, uint8_t data_len)
@@ -206,6 +207,7 @@ int cmd_mcf(const uint8_t *data, uint8_t data_len)
 }
 
 /*
+ * 측정 파라미터 쓰기
  * mcs?: piezo measurement parameter write
  */
 int cmd_mcs(const uint8_t *data, uint8_t data_len)
@@ -293,7 +295,7 @@ int cmd_mpa(const uint8_t *data, uint8_t data_len)
     ARG_UNUSED(data);
     ARG_UNUSED(data_len);
 
-    DBG_CORE("[MPA] enter\r\n");
+    DBG_PRINTF("[MPA] enter\r\n");
     if (piezo_init() != 0)
     {
         DBG_ERR("[MPA] piezo_init failed\r\n");
@@ -301,11 +303,11 @@ int cmd_mpa(const uint8_t *data, uint8_t data_len)
         return 1;
     }
 
-    DBG_CORE("[MPA] piezo_init ok\r\n");
+    DBG_PRINTF("[MPA] piezo_init ok\r\n");
     piezo_power_on();
-    DBG_CORE("[MPA] power on\r\n");
+    DBG_PRINTF("[MPA] power on\r\n");
     cmd_send_response_u16("rpa:", 1);
-    DBG_CORE("[MPA] response sent\r\n");
+    DBG_PRINTF("[MPA] response sent\r\n");
     return 1;
 }
 
@@ -318,7 +320,7 @@ int cmd_mpb(const uint8_t *data, uint8_t data_len)
     ARG_UNUSED(data);
     ARG_UNUSED(data_len);
 
-    DBG_CORE("[MPB] enter\r\n");
+    DBG_PRINTF("[MPB] enter\r\n");
     if (piezo_init() != 0)
     {
         DBG_ERR("[MPB] piezo_init failed\r\n");
@@ -326,11 +328,11 @@ int cmd_mpb(const uint8_t *data, uint8_t data_len)
         return 1;
     }
 
-    DBG_CORE("[MPB] piezo_init ok\r\n");
+    DBG_PRINTF("[MPB] piezo_init ok\r\n");
     piezo_power_off();
-    DBG_CORE("[MPB] power off\r\n");
+    DBG_PRINTF("[MPB] power off\r\n");
     cmd_send_response_u16("rpb:", 1);
-    DBG_CORE("[MPB] response sent\r\n");
+    DBG_PRINTF("[MPB] response sent\r\n");
     return 1;
 }
 
diff --git a/src/main.c b/src/main.c
index 332e051..42708d6 100644
--- a/src/main.c
+++ b/src/main.c
@@ -130,7 +130,7 @@ int main(void)
     power_control_reset_state();
 
     DBG_CORE("\r\n========================================\r\n");
-    DBG_CORE(" TEST BUILD %s (Zephyr)\r\n", FIRMWARE_VERSION);
+    DBG_CORE(" FIRMWARE %s (Zephyr)\r\n", FIRMWARE_VERSION);
     DBG_CORE(" BUILD TAG: %s\r\n", CONFIG_MCUBOOT_IMGTOOL_SIGN_VERSION);
     DBG_CORE("========================================\r\n");