Marantz SR620 - Page 17

3. Auto Stop
1) STOP1, STOP2 Terminals
@ When a “H” level signal is applied to STOP1 input, auto search scan speed is reduced to 1/2 (Slow mode).
@ When aH” level signal is applied to STOP2 terminal under the slow mode (STOP1 = at ‘‘H” level), the auto search
tuning is stopped.
Through the above operations, it is possible to stop the auto search after searching ARI or Stereo station only.
2) STOP3 Terminal
This terminal is the input of IF signal (=450 kHz) at time of AM (MW/LW). When this input frequency enters the speci-
fied range against 450 kHz, auto search tuning stops.
@ As the input amplifier has been built in, apply IF signal with the capacitor connected.
@ IFin, STOP3 input is not accepted at time of FM.
@ Range of Auto Tuning stopping.
MW Band 450 kHz + about 3 kHz
LW Band 450 kHz + about 600 Hz
@ Since IF signal has been amplitude modulated, it is adequate to apply it to IF iy, STOP3 terminal through the limitter
amplifier.
mn Dud
-—$—_<;—+— AM (MW/LW) IF SIGNAL
0.01 uF
LIMITTER AMPLIFIER
TC9147P
SPOR SISTEM IF jy, STOP3 INPUT AMPLITUDE Vy (IF) >5Vp-p
4. Memory Function
This is the function for tuning a desired channel by one-touch by constantly storing optional frequency data.
The terminals concerned with the memory are STO, M1 ~ M8, MC1, and MC2, a table of 11 terminals. Inputs are all ‘“H”
level active.
@ STO and M1 ~ M8 terminal are of !/O type with a built-in bipolar transistor status display driver.
@ MC1 and MC2 terminals control the built-in 16 channel preset memories as shown in the following table.
Allocation of 16 channel preset memories
Memory type
Memory addresses for 1 ~ 8 channels are assigned
by M1 ~ M8 terminals.
Memory addresses for 9 ~ 16 channels are assigned
by M1 ~ M8 terminals.
No input is accepted. Memory allocation holds the
previous status.
16 channel random
memory system.
Automatically allocated to 8 FM channels and
8 AM channels. Further, at time of AM, MW and
LW band random system.
@ MC1 and MC2 Inputs are of mutual resetting 1/O type with an internal latch circuit.
(Note) MC1 and MC2 terminals are of C-MOS I/O type and has no built-in driver.
14
8 FM/AM channel fixed
memory system.