Z-217 WINCHESTER CONTROLLE R
( c o n t i nued)
DATA SEPARATOR BOARD ALIGNMENT
The alignment procedure on page 6-6 of the ZW-100 Service Manual (0585-32) has
TEB Z-217-3
b een r e v i s e d .
He r e i s t he n e w p r o c e d u r e :
E ui ment Re uired
Dual Trace Oscilloscope (100 MHz or better) .
Frequency Counter (20 MHz, four digits, 0.05$ accuracy or better) .
P ower sourc e an d p o wer c o n n ec t o r .
Small flat-blade screwdriver.
Procedure
Prior to applying power, turn R31 FCCW (viewed from the board edge).
Then turn R31 CW four revolutions.
— A p ply power to the data
separator board and allow it to warm-up ten
m inutes .
Remove the jumper at JP1.
Install a jumper at JP4.
— Move jumper JP3 to the TEST position.
Connect the oscilloscope to TP7 and
adjust R33 for a positive pulse width
of 250 nS at the 0.4 volt level (see
the drawing at the right.)
Install the jumper at JPl in the TEST position.
— Move the jumper at JP3 back to its normal position.
— C o n nect the frequency counter to TP2 and adjust R32 for a frequency
of 1 0 . 0 0 MHz, +0 . 1$.
— Move the jumper at JP1 to its normal position.
— S e t t h e d u a l - t r a c e o scilloscope
sweep rate to 20 nS/Div. and the
vertical attenuators to 2 V/Div.
Connect one vertical input of' the
dual-trace oscilloscope to TP4; the
o t he r i n p u t t o T P 1 .
Sync t h e
oscilloscope to the signal on TP4.
Slowly adjust R31 so the 2 volt level
on the rising edge of the TP1 signal
occurs 3 nS to the left 'of the center
of the pulse at TP4 (see the display
drawing at the right) .
7Pg
TPT
Cali
~Z50ns+
2
7P+
20ns
Czars
G. E., ZDS Continuing Engineering (T10-30fk)
N ovember 14 ,
1 9 8 5s
Содержание Z-100 Series
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