Dynaco ST-70 Restoration Module
Assembly, Installation, and Adjustment Manual
Page 2
CAE Dynaco Driver Restoration Module PC-3R – R0: 7-02
Please note that this module houses components having lethal voltages present on
their leads and cases. Please take the appropriate care in both installing and
operating this module
.
Although you are unlikely to encounter any problems, should they occur they would
almost certainly be based on an improper assembly of the PC Board or the wiring to the
Stereo 70. Therefore to avoid the time consuming and frustrating task of troubleshooting
afterwards please remember these simple suggestions:
a.
Proper soldering is crucial
. Please refer to our soldering tutorial and practice on
surplus boards until you master the technique. Be especially careful to avoid solder
bridges or “cold” solder joints. Our experience shows that nearly
95% of all
problems are associated with soldering related errors
.
b.
Diodes, transistors, IC’s, (all semiconductors) and many capacitors (always
electrolytic types) are polar - this means that
there is a right and wrong way to
insert polarized components in the board
. If placed backwards, the component and
probably others nearby will be damaged upon initial power application. Double check
each step associated with these parts and once again later after you have had a chance
to take a break.
c.
Some components are color coded with their value (mostly resistors, but there may be
others). If you are not proficient at reading these codes, use an ohmmeter to double
check the value of each resistor before insertion. It is very easy to confuse a 100 ohm
metal film resistor with a 1000 ohm resistor or worse with a 100K ohm resistor.
III. Internal Wiring
Unless otherwise specified,
you should use 20 to 22 gauge stranded wire with Teflon
insulation
. Thicker wire, solid wire, or PVC insulation will cause problems - if not now
(too much strain on the boards or parts) or later (reliability issues). This can’t be
overemphasized.