Fostex B-16 - Page 25

switches ON to enter the ZERO RTN mode.
This operation will be repeated continuously but if it is to be cancelled,
it is only necessary to depress any button except REC or REPEAT. U7-10 will
then go to "H" , flip-flop 03 reset and U3-13 to "L" to cancel the repeat
mode.
4) Counter circuit
The count pulse and UP/DOWN signal from the transport are used. In the
main part is used the same P-MOS type LSI used in the transport main unit,
designated 08, and since the display is the "+/-" type, it is driven by
UI, U2, U3 , etc. For details, refer to the counter section, 4-6.
There is, however, one point which differs from that in the transport main
unit and that is repeat function. Due to this additional feature, it must
output an EQUAL signal at the CUE point. For this purpose, the EQUAL func 
tion of U8 is utilized, when the CUE button is depressed, C13 is discharged
through R49 and D19, but charged again through R48 and R50 when the button
is released. Then, during the period until U5-14 reaches threshold potential,
U5-15 goes to "L" level and U8-30 (LOAD REGISTER) goes to "H" level. The
counter display number is output from BCD OUT and this is sent to the
register inputs R a n, R d via D22 n* D25. During the period when U8-3O is at
"H" level, the signals from BCD OUT are input to R a R q and latched by
the register. In this way, the counter display time at the instant the CUE
button is depressed and released is latched by the register and when the
counter reaches the time that was latched in the register, an EQUAL signal
is output from U8-23.
a-1964 FOSTEX CORP- 62SS06S1 0O 22