YOKOGAWA TB400G-A1 Series, User Manual, Page: 121 / 140

<8. TROUBLESHOOTING>
8-2
IM 12E04A02-02E
(2) Err12 (lamp disconnection)
Carry out checking in the following order.
Operation and checking procedure Failure Mode and Corrective Action
1. Open the upper cover of the detector and con fi rm
whether the lamp is lit.
a. If it is not lit, a loosening of the P1 and P2 converter
and detector connection terminal screws is
assumed.
=> Tighten them again securely.
2. If there is no problem with the terminal screws
being loose, disconnect the wiring to converter
connection terminals P1 and P2, and measure the
resistance between detector connection terminals
P1 and P2.
b. If the resistance goes to in fi nity, it shows the lamp
fi lament has burned through.
=> Replace the lamp with the spare lamp as an
necessary.
=> After replacing the lamp, perform “lamp
control reference value calibration” and “span
calibration”.
3. If the lamp is lit, measure the DC voltage across
the converter connection terminals [S2 (+) and
AG(-)].
c. If the measured voltage is within ±0.5 V, a failure of
the lamp light quantity control receiving element is
assumed.
=> Request checking and/or repair of the
control preampli fi er.
(3) Err13 (lamp voltage failure)
Carry out checking in the following order.
Operation and checking procedure Failure Mode and Corrective Action
1. Measure the DC voltage across the converter
connection terminals [P1(+) and P2(-)] and con fi rm
that it exceeds the range of +3 to +6 V.
2. Check for shortcircuiting between the converter
and detector connection terminals P1 and P2.
a. As the lamp power supply circuit has the function
of overcurrent protection, if shortcircuiting is
eliminated, the lamp voltage is restored by itself.
3. Check for loosening of the primary and secondary
connectors (CN7 and CN8) of the lamp power
transformer in the converter.
b. If there is loosening due to poor contact, the lamp
voltage is restored by itself by re-inserting the
connectors.
c. If there are no problems in checking a. and b.,
a failure of the lamp power supply circuit on the
converter analog board is assumed.
=> Request checking and/or repair of the
analog board.
(4) Err14 (A/D circuit failure)
A failure of the A/D conversion IC or the measurement and comparison input circuits is assumed.
Request checking and/or repair of the converter CPU board.
3rd Edition : May. 31, 2010-00