Fukuda Denshi VaSera VS-1500, Service Manual

Page: 97 / 216

Chapter 6 Troubleshooting
6.2 Built-in Thermal Array Recorder
No. Symptom Check Remedy
Check if the error message "Thermal
head heat up" appears. Temperature is
indicated as 63°C or more. Wait to start printing until the
message goes off. Use the [Status]
window in the maintenance menu
to check thermal print head
temperature.
Check whether the cables connecting
the thermal print head have come
loose. Connect the cables securely to the
CN4 connector.
(
☞
10.1.1.A2)
Check whether the cables connecting
the thermal print head are broken. Replace the thermal print head.
Check the +24 VT (pin 5 on CN4 and
C20) thermal print head power supply
at start of print.
(
☞
10.1.1.A2)
• Only CN4 is not output.
Æ FET (Q37) is defective and
should be replaced.
(
☞
10.1.2.A3)
• CN4 and C20 are not output.
Æ The power supply unit is
defective and should be replaced.
1 Refuses to print.
Check whether printing signal at pin 3
on CN4 fluctuates. (
☞
10.1.1.A2)
If the output changes between H
and L, the thermal print head is
defective. Replace the thermal print
head.
Check the thermal print head for
soiling. Clean the thermal print head. Use a
cotton swab immersed in alcohol
for cleaning.
Use the [Built-in Recorder Test] window
in the maintenance menu to make
adjustments to the thermal print head. If the adjustments do not correct
the problem, replace the thermal
print head.
2 Printout is too light
and misses dots.
Check the service life of the thermal
print head. The thermal print head is a
consumable and deteriorates with use.
(Service life: approx. 50 km of
continuous printing) Replace the thermal print head.
Check the thermal print head for
soiling. Clean the thermal print head. 3 Uneven paper speed
and unstable printing
Check the service life of the paper
drive motor. The paper drive motor is a
consumable and deteriorates with use.
(Service life: approx. 8,000 hours of
continuous printing) Replace the paper drive motor.
(
☞
11.12)
Check if the error message "Thermal
head heat up" appears. Temperature is
indicated as 63°C or more. Wait to start printing until the
message goes off. Use the [Status]
window in the maintenance menu
to check thermal print head
temperature.
Check the paper tray for cracks and
bending and whether the gears mesh
properly. Replace the recorder unit.
Check whether the cables connecting
the paper drive motor are broken. Replace the cables.
4 The chart paper is
not fed.
Check whether the thermal motor is
supplied with +24 VM (C5, C6) when
printing is started.
(
☞ 10.1.1.A1)
If +24 V is not output, the power
supply unit is defective and should
be replaced.
Confidential Copying Prohibited
6-3