TEC B-370 Series Maintenance Manual page 66

6. DIAG. TEST OPERATION
NOTE: The following operation cannot be performed unless the sensor type is changed by the issue
command or feed command.
(1) Using the sensor adjustment in Diag. mode, measure the sensor voltage at the following four points.
Label: Print area Backing paper
Tag paper: Print area Black mark
Example:
(2) Using the following formula, calculate the threshold from the measured voltage:
When using labels (transmissive sensor):
Threshold = (Max. voltage at the backing paper) - (Voltage at the print area) - 0.7V
e.g.) 2.0V = 4.2V - 1.5V - 0.7V
When using perforated labels (transmissive sensor):
Threshold =
A
e.g.) 2.2V = 4.4V - (2.8V/2) - (1.6V/2)
When using labels with black marks (reflective sensor):
C
Threshold = (Min. voltage at the print area) - (Min. voltage at the black mark)
e.g.) 0.4V = (1.5V - 0.7V)/2
Backing Parper
Label
A
(4.4 V)
[ R E F L E C T I V E ]
[ T R A N S M I S S I V E ]
A
(Max. voltage at the backing paper)
Max. voltage at the backing paper
2
Perforation
2 . 8 V
4 . 1 V
B
Min. voltage at the backing paper
-
D
2
(2.8 V)
B
6-36
6.3 PARAMETER SETTING MODE
2
Label Black Mark
Backing Paper
(0.7 V)
D
EM18-33012
(Revision Date: Jan. 14 '99)
-
Label gap
C
(1.5 V)