Ricoh VT3500, Service Manual

Page: 226 / 330

2.3 THERMAL HEAD TEST
This function is used to determine which printer component is causing an
image problem on the master.
In this mode, the background pattern that is printed covers the entire sheet of
paper.
<Procedure>
1. Place paper on the paper table.
NOTE: To reduce thermal head load, use the smallest paper size possible,
i.e. the smallest size on which the area with the image problem can
be printed.
2. Access SP mode.
3. Input No. 90 and press the Enter key.
NOTE: The factory setting is pattern No. 7. If necessary, input another
background pattern with the Number keys.
4. Press the Master Making key. (original is not necessary.)
5. Make prints and check the image.
[Assessment]
Pattern image is normal .............. Part A component is defective.
Pattern image is abnormal .......... Part B component is defective.
Thermal Head
Drive PCB
Thermal
Head
Master Feed
Motor
Processing
Image
PCB
Conversion
A/D
PCB
Original
Transport
Motor
CCD
PCB
Fluorescent Lamp
A B
1 December 1993
4-20