Adj1. 1. 5 Dc924 Trc Adjust - Panasonic DP-C321 Service Handbook

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3. Perform the ADJ1. 1. 5 DC924 TRC ADJUST as required.
• Usually, check only that the ADC Sensor output and the LDC light quantity control
operate normally, and it is not necessary to change the ADC target value.
• Also, as the density control by ADC controls the LD light quantity so that ADC
patch density becomes the ADC target value, the LD light quantity changes
indirectly if the ADC target value is changed. Because of this, if the target value is
changed drastically, Gamma characteristics of the highlighted part may change,
resulting in the change of the gradation characteristics. In this case, after changing
the ADC target value, enter DC612, print out the Test Pattern 10 (or gradation
correction chart for TOOLS), and check the gradation characteristics.
For gradation characteristics correction, refer to the "Gradation Corection" in User
Guide supplied with the Main Processor and adjust it.
*When checking with the print output, refer to the note of DC924 TRC Adjust.
• When changing the ADC target value, change the ADC target value for TRC of the
changing color ( DC131 [753-23](Y), 753-25(M), 753-27(C), 753-29(K )) to the
same values.

ADJ1. 1. 5 DC924 TRC Adjust

Purpose To set up the image quality to meet the user's preference, by increasing and decreasing
the value of gradation correction center value of low density, medium density, and high density for
each YMCK color.
Usually, it is not necessary to perform this Diag except on customer's request or when
the gradation characteristics have changed due to changes of the ADC target value in
DC934 ADC Output Check.
Adjustment
Procedure
1. Enter DC924.
2. Click [Execute].
The data is integrated.
• If data is added, the density became darker; and if it is subtracted, the density turns
lighter. Initial values for L, M, H are 128.
• The correction quantity of the gradation correction described in "Gradation
Correction" in User Guide supplied with the Main Processor is different from the
correction value for this TRC Adjust. The correction value 1 in the User Guide is
equivalent to Low: 2, Mid: 3, Hi: 4 in this TRC Adjust.
• Even when the value is changed, it is not reflected into the image quality soon. It is
reflected after finishing this Diag, turning Power Off/On, and after printing 2 jobs
(e.g.: when one print is performed twice, the change in value is reflected in the
image quality of the 2nd print job).
3. Exit from Diag and turn Power Off/On.
4. Perform the PG Print or ordinary print of 2 jobs, and check the printing of the 2nd job.
Repeat Steps 2 to 4 until the customer is satisfied with the image quality.
Chapter 2 Maintenance