Filter
Top Products
Theory of Operation
Analog Section Detailed Circuit Description
2
2-131
2-205. Rear Panel Power Supplies
Power supplies are divided into guarded and unguarded. Unguarded supplies +5V
LOGIC, +12V, and -12V are referenced to +5V LOGIC COMMON and are generated on
the Digital Power Supply assembly (A19). Guarded supplies +5LH and -5LH are
referenced to LH COM, and the supply +5RLH is referenced to RLH COM. These
supplies are generated on the Regulator/Guard Crossing assembly (A17). Some ICs on
the A17 assembly do not have power and ground pins shown on the schematic. This
information is included in the table on sheet 1 of the Rear Panel schematic.
Table 2-16. Divider Settings and VCO Frequencies
Calibrator Output
Frequency at
TP16
U17 R Divider
Setting
U17 N Divider
Setting
Total Division
of VCO at
TP13
VCO Frequency
at TP13
10 Hz to 12 Hz 500 1000 1M 10 MHz to 12 MHz
13 Hz to 15 Hz 400 1000 800k 10.4 MHz to 12 MHz
16 Hz to 30 Hz 200 1000 400k 6.4 MHz to 12 MHz
31 Hz to 60 Hz 100 1000 200k 6.2 MHz to 12 MHz
61 Hz to 120 Hz 50 1000 100k 6.1 MHz to 12 MHz
130 Hz to 150 Hz 400 100 80k 10.4 MHz to 12 MHz
160 Hz to 300 Hz 200 100 40k 6.4 MHz to 12 MHz
310 Hz to 600 Hz 100 100 20k 6.2 MHz to 12 MHz
610 Hz to 1.2 kHz 50 100 10k 6.1 MHz to 12 MHz
1.3 kHz to 1.5 kHz 400 10 8k 10.4 MHz to 12 MHz
1.6 kHz to 3.0 kHz 200 10 4k 6.4 MHz to 12 MHz
3.1 kHz to 6.0 kHz 100 10 2k 6.2 MHz to 12 MHz
6.1 kHz to 12 kHz 50 10 1k 6.1 MHz to 12 MHz
13 kHz to 15 kHz 400 0 800 10.4 MHz to 12 MHz
16 kHz to 30 kHz 200 0 400 6.4 MHz to 12 MHz
31 kHz to 60 kHz 100 0 200 6.2 MHz to 12 MHz
61 kHz to 120 kHz 50 0 100 6.1 MHz to 12 MHz
130 kHz to 150
kHz
40 0 80 10.4 MHz to 12 MHz
160 kHz to 300
kHz
20 0 40 6.4 MHz to 12 MHz
310 kHz to 600
kHz
10 0 20 6.2 MHz to 12 MHz
610 kHz to 1.2
MHz
5 0 10 6.1 MHz to 12 MHz
2-206. Rear Panel Address Mapping
The rear panel decodes address lines from the bus connected to the main CPU through
connector P91. Decoding is accomplished with a C22V10 PLD (U8) with the following
chip selects:
• RPDUARTCS*, D00000-D0001F
• RPIEEECS*, D00020-D0002F
• Y52XXRD*, D00030-D00031
• Y5205WR*, D00032-D00033
• Y5220WR*, D00034-D00035