Page B-16
400 SERIES MAINTENANCE MANUAL
Rev. C
P/N 190-00140-05
B.8
INVERTER BOARD CONNECTORS
B.8.1 J13
Table B-18. J13 Description
Pin #
Pin Name
I/O
Description
1
12V
I
11 to 14 V dc.
2
CCFT_TA_NOT
I
Cold Cathode Transmit A Not input. Occurs at 58.5 kHz
and is active low. Inverter is capacitor coupled.
3
CCFT_TB_NOT
I
Cold Cathode Transmit B Not input. Occurs at 58.5 kHz
and is active low. Inverter is capacitor coupled.
4
CCFT_CURRENT
O
Cold Cathode Fluorescent Tube Current is an output used
to measure the amount of current leaving the tubes.
Output is a half - wave rectified wave form of a 58.5 kHz
current source with a 1 k ohm in parallel.
5
HEATER_ON
I
Heater On Input that when high enables the heater.
Heater is capacitor coupled.
6
VCC
I
7
GND
I
Ground.
8
INVTR_ON
I
Inverter On input that when high enables the inverter fly-
back supply. Invertor on if Vin > 4.5 V and Invertor off if
Vin < 0.4 V.
9
Not used.
I
Not used.
10
INV_V_CTRL
I
Inverter Voltage control analog input. Valid ranges from 0
to 5 volts.
11
PWR_INVTR
I
Inverter Power provides fused power to the inverter
flyback.
12
PWR_HTR
I
Heater power provides fused power to the heater.
B.8.2 J26
Table B-19. J26 Description
Pin #
Pin Name
I/O
Description
1
D
O
Bulb cathode.
2
Not used.
3
C
I
Bulb cathode. (May not be used if single bulb 463-00003-00 is
used.)
4
Not used.
5
B
O
Bulb cathode. (May not be used if single bulb 463-00003-00 is
used.)
6
Not used.
7
A
I
Bulb cathode.
