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HP 9800 Shift F1, Shift F2, Frequency, “A” Divide No, “N” Divide No, 4.4RECEIVER SERVICING, 4.5 TRANSMITTER SERVICING, 4.6 AUDIO/LOGIC BOARD SERVICING

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SERVICING

4.3.5DETERMINING SYNTHESIZER COUNTER DIVIDE NUMBERS

NOTE: For more information on the operation of the counters in U801, refer to Section 3.7.5.

Overall Div No. (K) = VCO freq ÷ .050

Example: 813.4875 ÷ .050 = 16,269.75

“A” Divide No. = 64 x Fraction (Integer K ÷ 64)

Example: 16,269 ÷ 64 = 254.20312 Fraction 254.20312 = 0.20312 64 x 0.20312 = 13

“N” Divide No. = Integer [K ÷ 64] – A

Example: Integer 254.20312 = 254 254 – 13 = 241

Fractional-N Div No. = (Fraction K) x 8

Example: Fraction 16,269.75 = 0.75

0.75x 8 = 6

4.4RECEIVER SERVICING

To isolate a receiver problem to a specific section, check the DC and RF voltages shown on the schematic diagram.

With UHF models only, the front end filter frequency shift inputs on U800, pins 6 and 7 should be as follows (L = 0V, H = 5V):

	Frequency	Shift F1	Shift F2
	Frequency	(Pin 6)	(Pin 7)
		(Pin 6)	(Pin 7)

	430-440 MHz	H	H
	440-450 MHz	L	H
	450-460 MHz	H	L
	460-470 MHz	L	L
	470-480 MHz	H	H
	480-491 MHz	L	H
	491-502 MHz	H	L
	502-512 MHz	L	L

4.5 TRANSMITTER SERVICING

To isolate a transmitter problem to a specific stage, check the DC and RF voltages shown on the schematic diagram.

4.6 AUDIO/LOGIC BOARD SERVICING

4.6.1 DIGITAL CIRCUITS

Because of the complexity and dynamic operation of the digital portion of the audio/logic board, servicing may be difficult. Special test equipment and knowledge of the operating software are usually needed to isolate a problem. Therefore, if a problem is suspected with the digital circuitry, it may be best to first make sure that the proper supply voltages are present and then replace the audio/logic board.

4.6.2 ANALOG CIRCUITS

The analog circuits on the audio/logic board can be checked by measuring the AC and DC voltages shown on the schematic diagram.

	February 2001
4-5	Part No. 001-9800-001

Contents

25 or 40 Watts (UHF); 15 or 30 Watts (800/900 MHz) 13.6 VDC Part No 13.6 VDC 25 or 40 Watts, UHF 15 or 30 Watts, 800/900 MHz Part No. 242-984x-2xx(UHF) Part No. 242-988x-2xx(800 MHz) TABLE OF CONTENTS 1 GENERAL INFORMATION 3 CIRCUIT DESCRIPTION 2 INSTALLATION TABLE OF CONTENTS (CONT’D) 4 SERVICING 5 PARTS LIST 6SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS LIST OF TABLES LIST OF FIGURES SECTION 1 GENERAL INFORMATION 1.3 PART NUMBER BREAKDOWN Table 1-1Part Number Breakdown 1.4 TRANSCEIVER IDENTIFICATION Table 1-2Identification Number Breakdown Type 1.5 ACCESSORIES Table 1-398xx Accessories Accessory Cable Data/Accessory Cable Desktop Accessories 1.6 PRODUCT WARRANTY 1.7 FACTORY CUSTOMER SERVICE 1.8 FACTORY RETURNS 1.9 REPLACEMENT PARTS 1.10 INTERNET HOME PAGE UHF 984x SPECIFICATIONS 800 MHz 988x SPECIFICATIONS 900 MHz 989x SPECIFICATIONS SECTION 2 INSTALLATION 2.2 MOUNTING THE TRANSCEIVER WARNING Item Figure 2-2Remote Mount Installation Components 2.3 POWER CABLE INSTALLATION Figure 2-3Accessory Cable Installation 2.4 ACCESSORY CABLE INSTALLATION Function Figure 2-4Accessory Cable Connector Figure 2-5R170 Location Diagram Sw Bat Out (pin 2) Horn Alert (pin 4) - See Section Ignition Sense (pin 6) - See Section Output D (pin 7) 2.5 REMOTE CONTROL UNIT INSTALLATION Figure 2-6Data Cable Installation (-001Cable Shown) 2.6 USING AN EXTERNAL SPEAKER 2.7 DATA CABLE INSTALLATION CAUTION Table 2-1Data Cable Wire Chart J301 Pin No Wire Color 2.8 KEY CAP KITS EMER F1 F2 F3 SCAN SCAN BKLHT MSG HORN SECTION 3 CIRCUIT DESCRIPTION POWER DISTRIBUTION (ALL MODELS) 3.2 POWER DISTRIBUTION AND SWITCHING Figure 3-1Power Distribution and Switching Figure 3-2Power On-OffControl Circuit AUDIO/LOGIC DESCRIPTION (ALL MODELS) 3.3 AUDIO/LOGIC BOARD DIGITAL CIRCUIT VRH/VRL PE0 PE1 PE2 PE3 PA0 PA1 PA2 PA3 PA4/PA5 3.4 RECEIVE AUDIO/DATA PROCESSING Figure 3-3Audio and Data Processing Circuitry Block Diagram 3.5 TRANSMIT AUDIO/DATA PROCESSING 3.6 DISPLAY BOARD DISPLAY DESCRIPTION 3.7SYNTHESIZER CIRCUIT DESCRIPTION (UHF MODELS) UHF SYNTHESIZER DESCRIPTION 4-3Figure Diagram Block RF Models) (UHF DESCRIPTION SYNTHESIZER UHF DESCRIPTION CIRCUIT Page Page Figure 3-5Synthesizer Chip U804 Block Diagram 3.8RECEIVER CIRCUIT DESCRIPTION (UHF MODELS) UHF RECEIVER DESCRIPTION Figure 3-6Limiter/Detector U201 Block Diagram UHF TRANSMITTER DESCRIPTION 3.9TRANSMITTER CIRCUIT DESCRIPTION (UHF MODELS) Page Page 800/900 MHz SYNTHESIZER DESCRIPTION 3.10SYNTHESIZER CIRCUIT DESCRIPTION (800/900 MHz MODELS) 7-3Figure Models) MHz (800/900 DESCRIPTION SYNTHESIZER MHz 800/900 Normal Mode Talk-AroundMode Page Page Page 800/900 MHz RECEIVER DESCRIPTION 800/900 MHz TRANSMITTER DESCRIPTION 3.12TRANSMITTER CIRCUIT DESCRIPTION (800/900 MHz MODELS) Page Page Page SECTION 4 SERVICING American EIA Standard Japanese EIA Standard (pF) Color Multi Figure 4-1Simplified Synthesizer Block Diagram 4.3 SYNTHESIZER TROUBLESHOOTING Table 4-2SMD Inductor Identification Mode Supply Voltage Output Level Control Voltage VCO RF In (pin 6) Overall Div No. (K) = VCO freq ÷ “A” Divide No “N” Divide No Fractional-NDiv No. = (Fraction K) x 4.4RECEIVER SERVICING SECTION 5 PARTS LIST FRONT PANEL ASSEMBLY AND MECHANICAL PARTS FRONT PANEL ASSEMBLY AND MECHANICAL PARTS (CONT’D) UHF RF AND PA BOARDS UHF RF AND PA BOARDS (CONT ’D) Page Page Page Page Page Page Page Page Page Page Page Page Page 800/900 MHZ RF AND PA BOARDS 800/900 MHz RF AND PA BOARDS (CONT ’D) Page Page Page Page Page AUDIO/LOGIC BOARD (ALL MODELS) AUDIO/LOGIC BOARD (CONT’D) Page Page Page 9800-SERIESRADIO MOUNTING KIT 9800-SERIESREMOTE MOUNTING KIT DC POWER CABLE AND HARDWARE KIT PART NO. 023-9800-410(10 Ft) PART NO. 023-9800-422(22 Ft) FRONT PANEL EXPLODED VIEW FRONT AND TOP MECHANICAL PARTS BOTTOM MECHANICAL PARTS REMOTE TRANSCEIVER MECHANICAL PARTS REMOTE CONTROL UNIT MECHANICAL PARTS SECTION 6 SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS TRANSISTOR AND DIODE BASING DIAGRAMS Page Page CAUTION: INTERFACE BOARD LAYOUT INTERCONNECT SCHEMATIC DISPLAY BOARD TOP VIEW DISPLAY BOARD BOTTOM VIEW PROGRAMMING CABLE (P.N. 597-2002-200) RPI (P.N. 023-9800-000)BOARD LAYOUT RPI (P.N. 023-9800-000)SCHEMATIC RF BOARD COMPONENT LOCATOR GUIDE (UHF) UHF RF BOARD COMPONENT LOCATOR GUIDE (CONT’D) ’D) RF BOARD COMPONENT LOCATOR GUIDE (800/900 MHZ) Page Page Page Page RF BOARD SCHEMATIC (REVISED 430-470MHZ) PA BOARD SCHEMATIC (25W, 430-470MHZ)