User manual

2.2 Front PCB
The front PCB carries five keys and a rotary encoder. With the help of a variable resistor the contrast
of the display can be adjusted. An Infrared Sensor (SFH 536) can be assembled additionally. A
suitable remote control is available via BayCom. See OSCAR user manual for a detailed description of
the key functions. A circuit diagram of the front PCB is shown on one of the following pages, if you
should intend to modify layout or design of the front PCB. The circuitry around the 74HCT86 is
required for the IR sensor only and is not necessary, when the IR sensor is not assembled.
2.3 Connecting the Main PCB
An assembly plan of the main PCB is shown on one of the next pages. It shows the position of the
connectors on the OSCAR main board. Pin 1 is marked for all connectors. The following diagram
shows the principal layout of the other connector pins:
Pin 1
Pin2
3
4
5 7
...
Pins and their numbers on the OSCAR connectors
Establish the following connections:
- Front PCB to Main PCB
The connection is established via the 20p. flat cable directly mounted to the front PCB. The connector
has to be connected in a way that Pin 1 of the cable (red marking) fits onto Pin 1 of JP3 on the main
PCB.
- CD-ROM to main PCB
Connection is established via a standard 40 pin AT bus flat cable (PC accessorie). Pin 1 (red marking)
on the main PCB (JP5) has to be connected to Pin 1 of the CD ROM drive.
Additionally, the CD ROM Nf has to be connected to the main PCB, since this is used to play normal
audio CDs. Connect a standard CD ROM Audio cable from the CD-ROM connector to JP9 on the
main PCB. Please check the polarity, otherwise L/R audio channels may be reversed.
- RS-232 to main PCB
The RS-232 is used to monitor the OSCAR operation on a PC (detailed description in th OSCAR user
manual). JP2 connects directly to a sub-D 9p. adapter as it is used on most serial PC cards.
Necessary connections are:
Pin 2 OSCAR connects to Pin 2 RS232
Pin 3 OSCAR to Pin 3 RS232
Pin 5 OSCAR to Pin 5 RS232
Other pins are not used. Please not the differing numbering of the pins of this connector (see
connector layout on next page)
JP4 can be used to connect a hard disk activity LED.
- Audio-Outputs.
All audio outputs can be found on JP7. The headphone outputs should be connected to a normal
3.5mm or 6.3mm head phone connector, the line-out outputs should be connected to Cynch
connectors. A shielded cable is recommended. The output level of the line outputs is 150mV at
47kOhm, for the headphones it is 500mV at 390 Ohms.
The remaining pins of JP7 can be used for power supply of the main PCB.
- Power supply
OSCAR requires 400mA at 5V and 100mA at 12V. Both supply voltages have to be properly
stabilized. Please not that power for CD ROM and hard disk are an additional load for the power
supply. We recommend a power supply which is capable to deliver 5V 2A and 12 2A simultaneously.