Output Signal Generating Conditions - Teac C-1 Service Manual

TAPE TRANSPORT SECTION
1-4 OUTPUT SIGNAL GENERATING CONDITIONS
Conditions for generating output signal are described in (1).
Conditions for setting and resetting the operational mem-
ory in the SYS-CON are described in (2). Resetting has
priority over all other operations in the SYS-CON. There-
fore, even if a set condition exists, the corresponding mem-
ory will not be set if a reset conditions exists.
Signs used in (1) and (2) are as follows, except tor those
indicated in Fig. 2.
F** (** are numerals): Flip-flops functioning as memories.
S**, R**: Confitions for setting and resetting F**.
Q**: Output of F** which rises to the high level when
F** is set.
DL: Delay. This condition is established when the delay
time described in the paragraph 1.3, (2) elapses.
All formulas established in the SYS-CON are expressed
by logical equations of AND and OR.
"|" means AND "+ > means OR
(Example)
RCO = Q0l
SOl1 = RCI. (PYI + SBI)
The above equations means:
RCO (record output terminal, pin 16) of the SYS-CON goes
high when QO1 is high. QO1 goes high when the REC
operation memory F@I is set. FO1 is set when the set
condition S01 is established. SO1 is established when RCI
is high and PYI or SBI is high. That is, Fol is set when the
REC button is depressed together with the PLAY or
PAUSE button, and the output QO1 goes high and thus
RCO goes high so the REC operation signal is output.
The bar "'—" in PY] and RES means the low level, and each
of these signs indicates the condition where the PLAY
button is not depressed, and the condition where no reset
signal exists.
In the logical formulas in (1) and (2), the first equation line
out of two lines is the general equation of the SYS-CON.
The second line is the equation applied to the C-1. Since
pins 11 to 14 of the SYS-CON are grounded in C-1, input
signals of RVW, MN1, R/M2 and MOD are usually at the
low level. If the general equation is modified taking ac-
count of this fact, it becomes the same as the equation
for C-1.
(1) Output
RCO = Q01
PYO = Q02+DL.QI10
SBO = Q03+DL.Q10
FFO = (Q05 + S05). DL + Q08 . R/M2
= (Q05 + $05). DL (C—1)
RWO= (Q06 + S06 + Q11).DL + Q08 . MNI
= (Q06 + S06). DL (C—1)
RMO= Qo07
(2) Conditions for setting and resetting operation mem-
ories (status memories) in the SYS-CON
FO1: REC operation memory
S01 = RCI.(PYI+ SBI)
ROL = RES + STI + FFI + RWI+R/M2. MOD + RSI
= RES+STI+ FFI + RWI + RSI (C —1)
F02: PLAY operation memory
S02 = PYI
RO2 = RES+ STI + SBI + PYI.(FFI+ RWI +
R/M2 . MOD)
= RES+STI+ SBI +PY1. (FFI + RWI)
(C —1)
F03: STAND-BY (PAUSE) operation memory
S03 = SBI
RO3 = RES+STI+ SBI. (PYI + FFI + RWI +
R/M2 -MOD) _
RES + STI + SBI (PYI + FFI+ RWI)(C — 1)
F04: Omitted
F05: FAST FORWARD operation memory
S05 = FFI. RES. STI.SBI.PYI.R/M2.MOD
FFI. RES. STI. SBI. PYI (C — 1)
RES + STI + RWI + (MNI + R/M2.MOD).
(SBI + PYI + R/M2 .MOD)
RES + STI + RWI + SBI + PYI C-1)
F06: REWIND operation memory
S06 = RWI. RES.STI.SBI.PYI. R/M2.MOD
= RWI.RES. STI. SBI. PYI (C-1)
RO6 = RES + STI + FFI +(MNI + R/M2.MOD)
(SBI + PY] + R/M2 .MOD)
= RES + STI + FFI + SBI + PYI
F07: RECORD MUTE operation memory.
{|
ROS
S07 = RMI.QO1 .Q02
RO7 = RES+STI+SBI+ PYI + FFI + RWI + RSI
+ R/M2 .MOD
= RES+STI+SBI+PYI + FFI +RWI+ RSI
(C- 1)
F08, FO9: Omitted
F10: RECORD DELAY operation memory.
S10 = QO1.Q02
Rio Q01 . Q03
F11: Omitted