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100mm GRAPHICS RECORDER TECHNICAL MANUAL
HA249875
Issue 1 Jan 99
Section 2
Page 2 - 4
2.1.2 Door resets continuously
1
If a disk is inserted, switch the recorder's power off, eject the disk and re-apply power. If the recorder now ini-
tialises correctly, replace the disc drive
2.
If no disk or memory card is inserted, withdraw the recorder from its case, and check the status of the SBC LED
(fig 2.1.1 shows location). If this LED is flashing, replace the SBC. If it is on continuously, replace the intercon-
nect card.
2.1.3 Touch screen 'offset'
In this case, the displayed response to touching the screen appears in a different place from that expected. For exam-
ple, touching one of the menu items highlights the item below it or above it. (It is not likely that the 'offset' would be
as extreme as this, it may just be a millimetre or less out, but enough to make the recorder unfriendly to use.) To
correct this offset, follow the screen recalibration procedure at the end of the display/ backlight replacement instruc-
tions (section 3.3.7).
2.1.4 Screen saver not working
The screen saver feature introduced in 1998, required a change to the hardware on the video board. It is thus possi-
ble, that if the software has been upgraded 'in the field', the menu will appear in the 'instrument' section of configura-
tion, but the screen brightness settings will be ignored. To correct this, contact the local service representative for an
upgrade board.
2.1.5 Measurements outside specified tolerance
Input open circuit
Check sensor leads and termination
Configuration problem
Check that the input ranges, scales, are as required. For thermocouples, check the cold
junction type and settings.
Unsuitable environment
Check that the ambient temperature and humidity are within specification limits
Faulty input board
May affect more than one channel; replace board.
Inputs adjusted
Check input adjust (section 2.2) and restore factory configuration if necessary.
2.1.6 Battery low/battery flat message
If either of these message appears during normal operation, replace the battery board. If the messages appear after the
recorder has been powered down for a protracted period (several months), allow the recorder to operate continuously
for 48 hrs. or so, then power off and on again. If the message recurs, replace the battery board - otherwise continue
normal operations
2.1.7 Disk problems
DISK LIFE ESTIMATES
Manufacturers of high quality diskettes quote lifetimes of between 10 and 20 million revolutions per track. To esti-
mate a conservative disk life, we have taken a value of 2.5 million revolutions and assumed that half the spinning
time is spent on one track, thus giving a life of 5 million diskette revolutions. The disk spins five times per second,
giving a life of 1 million seconds or approximately 11.5 days of continuous use.
Thus, if your diskette is spinning say 15 seconds every minute (on/off ratio = 1/4), the expected life is 11.5 x 4 = 46
days. Clearly this is a conservative estimate, and diskettes do vary in quality.
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