Boehringer Miditron Junior II, Руководство по обслуживанию

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Service Manual Miditron
®
Junior II / ID 1997491 / MJ / 1.0 - June 1998 / Page 62
10. Electronics
10.3 Electronic modules
10.3.1 PCB Main
The mainboard (9) is screwed to the base plate of
Miditron
® Junior
II
. The plug for the voltage supply, the
serial interface and the ROM-card are directly soldered. All
other components (light barriers, motors ...) are connected
to the PCB Main via cable and plug. The PCB Interface and
the PCB Measuring Head also belong to the connected
components.
The Miditron ® Junior
II
is supplied via an external DC
mains adapter with 5V for the printing device and 12 V for
the supply of the other electronic.
The PCB Main contains the following functional groups:
- Power supply with fuses
- Mains a 5V, +/- 12 V
- Hardware core with 80535 processor, decoding logic
- Boot-memory (EPROM), program memory (FLASH),
data memory (RAM) and memory for permanent data
(EEPROM)
- Real time clock, battery buffer with 114 bytes freely
disposable RAM
- Uncoupled ROM-card-slot for memory card 64 KB and
128 KB
- 3 serial interfaces, RS 232
- Interface to measuring head board with switch to control
the LEDs and evaluation of U/f-converted receiver signal
- Control to contact measuring head board
- Interface to PCB Interface with printer controller, display,
signal transmitter, status LED and keyboard
- Stepper control for motor measuring head unit
- DC-motor-control for motor belt drive cross transport
- 3 light barrier inputs
Fig. 47
9