Field Service Manual December 2003
Page 129 of 276
Measuring the encoder signals and adjusting the head.
Tools Required.
An oscilloscope with a minimum bandwidth off 100 MHz. Preferably a digital
memory oscilloscope e.g. TEKTRONIX 2430A.
Adjustment Procedure.
1. Take maccon board and place it on the extension board.
2. Connect T_SPH1 with A and connect T_SPH2 with B of the oscilloscope. You
can find both pins on connector JH4 on Maccon.
3. Check that both signals A and B are 90 degrees shifted. They should be within 80
and 100 degrees shifted phase.
4. Connect W_SIDX_N to the A channel.
5. Check the index puls signal.
Note: The length of the signal(5
µ
s) is drumspeed depending
T_SPH1 : A
T_SPH2 : B
Ground : JB2
Important Remark.
A logical zero = the signal is less than or equal to 0.8 volt.
A logical one = the signal is greater than or equal to 2 volt.
DO NOT forget to run ‘secor’ !!
Parameters which have to be checked after replacing the glassdisc.
6 Index to first pxl (1/32 mil) :
96 Drum circumference (1/32 mil) :
98 Y linear correction (ppm) :
41 Drum load position :
42 Drum unload position :
61 Frnt rol pos after flm rel (0=off):
62-66 Back rol pos after flm rel (0=off):
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