MX922 could not print color even after clean/deep clean many times

My MX922 did print about 600 color pages and could not print very clear. Then I did a few time of clean/deep clean from maintenance. The test pattern is ok for PGBK. However, there is no color (or a little color once a while). All the colors ink could be detected. Is there anything that I could do now? Or the color printhead is bad? If this is the case, could you I chang that?
Thanks,
TJ

Hi tjs,
Since the cleanings did not improve the print quailty, please perform an automatic and manual print head alignment to see if this will help.  To do this, please follow the steps located at the link below:
Print Head Alignment
If you still experience difficulty after performing the alignments, the printer may require servicing; please call or email us at one of the methods on the Contact Us page to obtain your servicing options.
Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.

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      2  select max(c) from t where n =1;
    Explained.
    SQL> select * from table(dbms_xplan.display);
    PLAN_TABLE_OUTPUT
    Plan hash value: 2966233522
    | Id  | Operation          | Name | Rows  | Bytes | Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT   |      |     1 |  1004 |  1574   (1)| 00:00:19 |
    |   1 |  SORT AGGREGATE    |      |     1 |  1004 |            |          |
    |*  2 |   TABLE ACCESS FULL| T    | 50000 |    47M|  1574   (1)| 00:00:19 |
    Predicate Information (identified by operation id):
    PLAN_TABLE_OUTPUT
       2 - filter("N"=1)
    14 rows selected.
    SQL> explain plan for
      2  select /*+ index (t t_ix) */  max(c) from t where n = 1;
    Explained.
    SQL> select * from table(dbms_xplan.display);
    PLAN_TABLE_OUTPUT
    Plan hash value: 3231292748
    | Id  | Operation                    | Name | Rows  | Bytes | Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT             |      |     1 |  1004 |  7244   (1)| 00:01:27 |
    |   1 |  SORT AGGREGATE              |      |     1 |  1004 |            |          |
    |   2 |   TABLE ACCESS BY INDEX ROWID| T    | 50000 |    47M|  7244   (1)| 00:01:27 |
    |*  3 |    INDEX RANGE SCAN          | T_IX | 50000 |       |    98   (0)| 00:00:02 |
    PLAN_TABLE_OUTPUT
    Predicate Information (identified by operation id):
       3 - access("N"=1)
    15 rows selected.

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