External Inspection Checklist; Internal Inspection Checklist - Tektronix 2246 1Y Service Manual

Item
Cabinet, Front Panel, and
Cover
Front-panel controls
Connectors
Carrying Handle
Accessories
Item
Circuit Boards
Resistors
Solder Connections
Capacitors
Semiconductor
Wiring and Cables
Chassis
Table 6-2

External Inspection Checklist

Inspect For
Cracks, scratches, deformations,
damaged hardware or gaskets.
Missing, damaged, or loose knobs,
buttons, and controls.
Broken shells, cracked insulation,
and deformed contacts. Dirt in
connectors.
Correct operation.
Missing items or parts of items,
bent pins, broken or frayed cables,
and damaged connectors.
Table 6-3

Internal Inspection Checklist

Inspect For
Loose, broken, or corroded solder
connections. Burned circuit boards.
Burned, broken, or cracked
circuit-run plating.
Burned, cracked, broken, or
blistered.
Cold solder or rosin joints.
Damaged or leaking cases.
Corroded solder on leads or
terminals.
Loosely inserted in sockets.
Distorted pins.
Loose plugs or connectors. Burned,
broken, or frayed wiring.
Dents, deformations, and damaged
hardware.
Maintenance—2246 1Y and 2246 Mod A Service
Repair Action
Touch up paint scratches and
replace defective components.
Repair or replace missing or
defective items.
Replace defective parts. Clean or
wash out dirt.
Replace defective parts.
Replace damaged or missing items,
frayed cables, and defective
parts.
Repair Action
Clean solder corrosion with an
eraser and flush with isopropyl
alcohol. Resolder defective con­
nections. Determine cause of
burned items and repair. Repair
defective circuit runs.
Replace defective resistors. Check
for cause of burned component
and repair as necessary.
Resolder joint and clean with
isopropyl alcohol.
Replace defective capacitors. Clean
solder connections and flush with
isopropyl alcohol.
Firmly seat loose semiconductors.
Remove devices having distorted
pins. Carefully straighten pins (as
required to fit the socket), using
long-nose pliers, and reinsert
firmly. Ensure that straightening
action does not crack the pins,
causing them to break.
Firmly seat connectors. Repair or
replace defective wires or cables.
Straighten, repair, or replace
defective hardware.
6-3