TELEREADER CWR-685E, Service Manual

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GAIN VR in the rear panel, and is synthesized with the signal of CW monitor OSC at 800 Hz
which is delivered from J3-7 on main PCB (in actual operation, either one signal only is gi-
ven here). After level adjustment at AFSK GAIN VR, the signal is fed again to J4-1 terminal
on MODEM PCB, and reappears at J4-4 terminal as AFSK signal having shaped waveform,
and is delivered from the AFSK OUT terminal in the rear panel.
The AFSK monitor speaker drive output which is delivered from J3-8 terminal on MODEM
PCB is once fed to J10-10 on the main PCB, and is synthesized with the CW monitor spea-
ker drive output, and then delivered to J9-6 terminal. This output signal is applied to the
VOLUME slide VR in the front panel to be controlled in the sound volume, and drives the
built-in output monitor speaker or PHONE output terminal in the rear panel.
3. Input/output actions
3.1 Actions of switches
RESET PB
Only while it is being depressed, the J7-2 terminal on main PCB is connected to GND.
FILTER
In OFF position, the J7-3 terminal on main PCB is connected to GND.
In ON position, the J7-4 terminal on main PCB is connected to GND.
SPACE NARROW
In NARROW position, the J7-5 terminal on main PCB is connected to GND.
CWIDA/CWIDB
In CWID A position, the J706 terminal on main PCB is connected to GND; in CWID B, the
circuit is open.
PAGE PB
While it is being depressed, the J7-8 terminal on main PCB is connected to GND; when it is
not pushed, the J7-7 terminal on main PCB is connected to GND.
MODE A/MODE B
In MODE B, the J7-9 terminal on main PCB is connected to GND.
CW/RTTY
In RTTY position, the J7-11 terminal on main PCB is connected to GND; in CW position, the
J1-7 terminal on MODEM PCB is connected to GND.
ASCII/BAUDOT
In ASCII position, the J7-12 on main PCB is connected to GND.
LTR PB
Only while it is being pressed down, the J7-14 on main PCB is connected to GND.
FIG PB
Only while it is being pressed down, the J7-13 on main PCB is connected to GND.
LOCK U.O.S.
When turned on, the J7-15 terminal on main PCB is connected to GND.