Disassembly Instructions; Special Handling Of Static Sensitive Devices; Cleaning; Repair And Replacement - Keithley 776 Instruction Manual

5-5. Disassembly Instructions
If it is necessary to troubleshoot the ins1rument or re-
place a component. use the following disassembly pro-
cedure to remo\:e the top and bottom covers:
1. Remove the four screws that secure each of the top
and the bottom covers.
2. Grasp 1he top cover al the side and carefully Iif1 it off
the instrument. Similarly remove the bottom cover.
3. When replacing the covers. reverse the above proce-
dure.
5-6. Special Handling of Static
Sensitive Devices
CMOS devices are designed to operate at a very high
impedance levels for low power consumption As a
result. any normal stalic charge that builds up on your
person or clothing may be sufficient to deslroy these
devices if they are not handled properly. When handling
such devices. use precautions which are described in the
following to avoid damaging them.
1. The CMOS ICs should be transported and handled
only in containers specially designed to prevent static
build-up. Typically. these parts will be received in
static-protected containers of plastic or foam. Keep
these devices in their original containers until ready for
installation.
2. Remove the devices from 1hc protective containers
only at a properly grounded work slation Also ground
yourself with a suitable wrist strap.
3. Remove the dwiccs only by the body: do not touch
the pins.
4. Any printed circuil board in1o which the device is to
be inserted must also bc grounded 10 the bench or table.
5. Use only anti-static type solder sucker.
6. Use only grounded soldering irons.
7. Once the device is installed on the PC board. the
device is normally adcquatcly protected. and normal
handling rcsumc.
5-7. Cleaning
Model 776 should bc cleaned as often as operating
condition require. Thoroughly clean the inside and the
outside of the instrument. Remove dust from inaccessi-
ble areas with lov pressure compressed air or j'acuum
cleaner. Use alcohol applied with a cleaning brush to
remove accumulation of din or grease from connector
contacts and component terminals.
Clean the exterior of the instmmenl and the front
panel with a mild detergent miscd with waler. applying
the solution with
a
sof1. lint-free cloth.
5-8. Repair and Replacement
Repair and rcplaccment of clcctrical and mechanical
parts must bc accomplished with great cam and caution
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