November, 99
All Rights Reserved
42
B-443 Bar Code Printer
Service Manual
4.7 Black Mark Sensor / Gap Sensor (Receiver) Replacement
Black mark sensor is reflection type sensor. It is connected to JP4 (3 pin connector). A multi-
meter is used to measure the signal of Pin2 to test if there is voltage variation when black mark
is detected. Before conducting the test, please invoke the BLINE command first. The printer will
switch from gap sensor to black mark sensor. If there is no voltage variation, please follow steps
below to replace the black mark sensor / gap sensor (receiver) PCB.
1. Turn off the printer power.
2. Remove the power cord and RS-232 and/or parallel port cable.
3. Open the top cover of the printer.
4. Remove the printer front panel. (Cf. Fig. 3.14)
5. Remove the two screws and the metal cover. (Cf. Fig. 3.15)
6. Release the cable tie and remove the peel-off sensor connector. (Cf. Fig. 3.16)
7. Remove the screw on the PCB of peel-off and cutter connector.
8. Remove the screws in the lower left, lower right corners of the main mechanism. (Cf. Fig.
3.17)
9. Remove all four screws of the internal label roll mount. (Cf. Fig. 3.18)
10. Move the mechanism in the label feed direction about 5 mm.
11. Take out the internal label roll mount and remove the connector. (Cf. Fig. 3.19)
12. Remove the screw of ground wire on the mainboard.
13. Remove all the connectors on mainboard. (JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP11, JP7,
JP9, JP12)
14. Take out the mechanism.
15. Remove one flat tap screws and black mark sensor PCB.
Fig. 4.10 Black Mark Sensor and Gap Receiver Sensor
16. Reassemble the removed parts in the reverse order of removal.
Summary of Contents for B-443
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