Product: 492 Ser.1
Date: 2-12-85
Change Ref: M55287
ADD to Page 4-5 in the Maintenance Section, after the paragraph
on Diode Checks:
Surface-Mounted Components
Surface-mounted conponents (SMC's) have been used in this instrument.
These SMC's are mounted directly onto the circuit board, rather than
through holes in the PCB. Electrode configuration of these conponents
is shown in Fig.4-4A.
J vLe J « s o u r c e J I a n o o e t *
V - Λ β βΑΤη
-------
] U a , « CATH00Ejj
-------
^ ANODE — f c
TRANSISTOR
DIODE
Fig. 4-4A. Electrode configuration for Surface-Mounted Components.
The positive end of electrolytic capacitors is identified with a band
Other capacitors and resistors have no visible identification, though
their value can be measured with an Ohm Meter or a Capacitance Meter.
Surface-mounted semiconductor devices are statically sensitive, and
should be treated as outlined in the beginning of this section.
Replacement. A Hot Air Machine, such as Hart Model 200A manufactured
by Nu-Concept Computer Systems Incorporated of Colmar, Pennsylvania,
is recommended for unsoldering and soldering surface-mounted
components.
Page 5 of 6
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