Mysql query using where and group by clause

I have the following table.

mysql> select * from consumer9;
+------------+--------------+-------------------+
| Service_ID | Service_Type | consumer_feedback |
+------------+--------------+-------------------+
|        100 | Computing    |                -1 |
|         35 | Printer      |                 0 |
|         73 | Computing    |                -1 |
|         50 | Data         |                 0 |
+------------+--------------+-------------------+

I want to use GROUP BY clause in my project. I am getting an error when I am using the query:

SELECT  Service_ID, Service_Type, SUM(consumer_feedback) 
FROM consumer9 
GROUP BY Service_ID 
WHERE Service_Type=Printer;

Error

ERROR 1064 (42000): You have an error in your SQL syntax; check the
manual that corresponds to your MySQL server version for the right
syntax to use near ‘where Service_Type=Printer’ at line 1

Mysql query using where and group by clause