SB-903

TR-2600A PLL Unlock                  1-14-86


Some cases of PLL unlock on the TR-2600 may be caused by a failure of the
crystal oscillator circuit X2, X3, and Q13.  This may be corrected by
performing the following changes.

On the TX unit (X56-1470-10)

Replace diodes D13 and D14 (MA856) wit a series pair of BA282 diodes.  Also
change resistor R54 to 47 ohms.

Parts required:

BA-282 diode        4 each.
47 ohm chip resistor (RD73FB2A470J) 1 each

This change is applicable to serial numbers before SN 702XXXX.
Time required for this modification is 1 hour or less.
CLM
(c) 121589TKC