238pro.com Fixing Tascam 238 and friends


Signals on correctly working capstan motor

E-mail me at denis @ 238pro.com if you have questions.

Capstan board with locations of TP1 and TP2, as well as solder jumpers to select either 4.8 or 9.6 cm/s tape speed. Only one jumper should be shorted at a time!

Signal at TP1 at 4.8 cm/s; 1 ms/div, 1 V/div. At 9.6 cm/s period will be one half of shown here.

Signal at TP2; 1 ms/div, 1 V/div.

Lead 6 of IC1 at 4.8 cm/s; 1 ms/div, 2 V/div. At 9.6 cm/s period will be one half of shown here.

Signal at C12 or C14, either lead; 10 ms/div, 2 V/div. At 9.6 cm/s period will be one half of shown here.

Signal at C2; 1 V/div. Voltage should be close to max voltage of impulses at TP2.

Signal at lead 2 of IC3; 1 V/div.