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Teledyne API M100E Analyzer Operation Manual Troubleshooting & Repair

271

Table 12-5: DC Power Supply Acceptable Levels

CHECK RELAY BOARD TEST POINTS

FROM TEST POINT TO TEST POINT

POWER

SUPPLY

VOLTAGE

NAME # NAME #

MIN V MAX V

PS1 +5 DGND 1 +5 2 +4.80 +5.25

PS1 +15 AGND 3 +15 4 +13.5 +16.0

PS1 -15 AGND 3 -15V 5 -14.0 -16.0

PS1 AGND AGND 3 DGND 1 -0.05 +0.05

PS1 Chassis DGND 1 Chassis N/A -0.05 +0.05

PS2 +12 +12V Ret 6 +12V 7 +11.8 +12.5

PS2 DGND +12V Ret 6 DGND 1 -0.05 +0.05

12.6.3. I

C BUS

Operation of the I

C bus can be verified by observing the behavior of the LED labeled D1 on the relay board in

conjunction with the performance of the front panel display. Assuming that the DC power supplies are operating

properly and the wiring from the motherboard to the keyboard as well as from the keyboard to the relay board is

intact, the I

C bus is operating properly if:

 D1 on the relay board is flashing or

 D1 is not flashing but pressing a key on the front panel results in a change to the display.

If the display is locked up or if the analyzer is not booting up at all, the I

C bus may be the cause. Contact

customer service if you suspect a problem with the I

C bus.

12.6.4. KEYBOARD / DISPLAY INTERFACE

The front panel keyboard, the display and the keyboard/display circuit board can be verified by observing the

operation of the display when power is applied to the instrument and when a key is pressed on the front panel.

Assuming that there are no wiring problems and that the DC power supplies are operating properly:

 The vacuum fluorescent display is working properly if, on power-up, a “-“ character is visible on the upper

left hand corner of the display.

 If the analyzer starts operation with a normal display but pressing a key on the front panel does not change

the display, then there are three possible problems:

 One or more of the keys is bad

 The interrupt signal between the keyboard circuit and the motherboard is broken due to a cabling

problem or

 The keyboard circuit is bad.

You can verify this failure by logging on to the instrument using APICOM or a terminal program. If the analyzer

responds to remote commands and the display changes accordingly, the display wiring or the I

C bus may be

faulty.

04515F DCN6048