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3. CHECK AND ADJUSTMENT
3.1 DISPLAY UNIT CHECK
As the CN-24 color net recorder is properly adjusted at the factory, no adjustment is
required in the field. This also applies to the PC boards supplied as maintenance parts.
Do the following adjustments when malfunctioning is found or the equipment is overhauled.
3.1.1 Self-Check
The self-check screen provides the information to check the following;
a) Panel switch contact
b) Function check (KP pulse, CIF line)
c) Device check (BEROM, SRAM, DRAM)
Procedure
1. Turn on the POWER for a few seconds, while pressing [ - ] key of TM RANGE.
Self-check screen appears. The EVENT key functions to select a self-check; panel
switch check and device/function check.
2. Check the functions in accordance with the figure 3.1.
3. To exit from the self-check mode, turn off the power.
PANEL SWITCH CHECK
To check keys for proper operation, press each
key one by one while observing the screen. If
the key is functioning properly, "0" is replaced
by 1" when the key is pressed.
"ON" : 1. "OFF" : 0
Rotary switch -? contact number
DEVICE/FUNCTION CHECK
Pressing the VENT key moves the asterisk (*)
to the item "MAIN CPU" and starts checking
each device in the order displayed on the screen.
In the DRAM check, the entire screen is
alternately painted in reddish brown and white
four times each. If everything is normal, "OK"
appears. If something is wrong, nothing appears.
NOTE: PORT results
To perform PORT check, connect dummy
connector to J3. "1" is displayed without
connection.
Indication of internal settings (S1 S2).
See pages 4-1 and 4-2.
Fig. 3.1 Self-Check
3-1
OK
1: defective CIF line
2: defective MT.12 line
3: Both CIF and MT.12 lines defective
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