Figure 4-11. Frequency Generation Unit Block Diagram (700-800 Mhz); Table 4-15. Lv Frac-N U6751 Pin Descriptions (700-800 Mhz) - Motorola ASTRO XTL 1500 Detailed Service Manual

Digtal, vhf/uhf range 1/uhf range 2/700–800 mhz

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Table of Contents

DETECTOR BIAS

Q6757 RX and

Super Filter

Figure 4-11. Frequency Generation Unit Block Diagram (700–800 MHz)

Table 4-15. LV Frac-N U6751 Pin Descriptions (700–800 MHz)

June 15, 2005

Troubleshooting Procedures: 700–800 MHz Main Board Troubleshooting

Auxiliary logic output, high selects U6754 OSC2

Auxiliary logic output, high selects U6755 OSC1

Auxiliary logic output, high selects U6755 OSC2

Lock detect—logic high indicates in-lock condition

3.0-V supply (phase detector)

Ground (digital)

SPI data I/O

SPI enable line—active low

Modulation input from controller

Multiplier clock output

Multiplier clock output

16.8MHz Reference

to Controller and

Receiver Back End

Prescaler Input

to Controller

MAEPF-27804-O

6815854H01-A

Troubleshooting