Preliminary Procedure - Tektronix 4010 Maintenance Manual

Adjustment-4010 Maintenance
20. (4010-1 Only) Hard COpy Threshold
Check/Adjustment (R35-Hard Copy
Threshold on Hard Copy TARSIG Amplifier
Board in display unit)
Page 4-20
Adjust Hard Copy Threshold for pulse overlap of 1/3
pulse height of pulses observed at TP32 and TP30 on
the Hard Copy TARSIG Amplifier Board during Hard
Copy scanning.
21. (4010-1 Only) Hard Copy Writing
Check
Page 4-21
Check for five satisfactory copies of same full screen
display.
22. Restoring Original Conditions
Page 4-21
Turn Terminal off; remove line plug; reset transformer
wiring and fuse; reset option straps; remove jumper(s)
(2 jumpers from 021-0065-00 Interface, or 1 jumper
from 021-0074-00 Interface, or two jumpers from TTY
Port Interface). Reconnect output cable or reset the
control switch (cable on 021-0065-00 or TTY Port
Interfaces; switch on 021-0074-00); remove extender
card and insert Deflection Amp and Storage Card.
Transformsr
Shield
Preliminary Procedure
Turn off the Terminal power switch (at top of pedestal)
and remove the line cord from the power source.
I
WARNING
I
Dangerous voltages exist within the Terminal display
unit and pedestal. Normal electrical precautions
should be observed whenever working within those
units while the covers are removed.
Although the Terminal can be adjusted without
separating the display unit and pedestal, it is much more
convenient if they are separated and placed alongside each
other on a work bench. To separate them, remove the four
screws which hold the display unit to the pedestal. The
screws are located underneath the display unit mounting
plate which is on top of the pedestal. (Refer to the
mounting procedure illustration in Fig. 3-1, if necessary.)
Support the front of the display unit while the last screw is
being removed. Then move the display unit back about 1/2
inch and lift up on it. Withdraw enough cable from the top
of the pedestal to permit the display unit to be set down on
a bench adjacent to the pedestal as shown in Fig. 4-1.
Fig. 4-1. Setup for Adjusting.
4-6
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