Electrical Adjustment Of The Connection Cable Circuit; Removing The Upper Case - Sony GB-5A Bedienungsanleitung

4. Electrical Adjustment of the Connection Cable Circuit

(SR127/SR128 series only)
* The operations described in this section are not required
for the GB-A series which are shipped together with the
connection cable in the electrically adjusted condition.
When connecting the SR127/SR128 series with a display
unit, use a CH01 series (option) connection cable. The
connection cable must be electrically adjusted together
with the used scale unit. Perform this adjustment according
to the procedures outlined below. Electrical adjustment is
performed in order to optimize the PM (Phase Modulation)
signal from the scale. Therefore, if the adjustment is not
performed as specified, the scale accuracy specifications
will not be satisfied.
Note
When the scale unit and display unit connection cable
(CH01 series) are ordered together, they are shipped in the
adjusted condition so no adjustment is necessary. Connect
the scale and cable so that the serial No. on the scale side
matches the combination No. on the connection cable side.
60
Required items
• Oscilloscope
( Sensitivity : 0.01 V or more,
frequency bandwidth : 1 MHz or more)
Input sensitivity : AC0.1 V/div (1 using a 10 : 1 probe)
Horizontal axis sweep : 50 ms/div to 0.5 ms/div
Trigger source : INT
Trigger mode : AUTO
• Standard screwdriver (for rotating the trimmer)
• Phillips screwdriver
(for removing and mounting the upper case)
〈1〉 Removing the upper case
Remove the three M2.6 screws mounting the upper case of
the head amplifier unit and remove the upper case.
Take care not to lose the nuts at this time.
M2.6
Upper case
Nuts
Fig. 4-1
M2.6