MLS MLSH041 Especificaciones descargar pdf (Pagina 14)

LBI-38421A

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Receiver Voltage Reading

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IC and Chip Component Replacement

Procedures

Also, provided in the Maintenance Manuals for each

circuit board are IC Data Sheets with information about

each IC package used on that particular circuit board.

DTMF Microphone Modification

1. Remove the top radio cover and locate the

System Control/Synthesizer Board (A801).

2. To isolate J701-1 from the printed board,

carefully cut the zigzag run on the component

side of the board near capacitors C613 and C615

(see Figure 5).

3. Solder a wire (#24 AWG) to J701-1 on the

component side of the board.

4. Solder the other end of this wire to the output of

the 9-Volt Regulator IC207, pin 3. Pin 3 of

IC207 is the pin nearest the rear wall of the

radio.

5. Locate the connector plug on the DTMF

microphone and insert the blue wire in P701-1.

6. If an external speaker is desired with the DTMF

microphone, perform the following

modifications:

a. On the Transmitter/Receiver Board (A802),

connect jumper plug P502/551 across pins 1 and

2 of J502/J551 (IN).

b. Verify that the internal speaker plug P503/P552

is connected to speaker jack J503/552.

c. Locate the internal speaker in the front cap

assembly and cut the two wires from the speaker

terminals.

d. Solder two extension wires to these cut wires and

run the wires along the side wall near the System

Control/Synthesizer Board (A801) and through

the opening around J701 at the rear of the radio.

e. Add a connector to these wires and a mating

connector to the leads of the external speaker.

f. Strain-relieve the wires inside the radio with a tie

wrap at J701-8.

External Speaker Option LS1D

The standard MLS II is configured for internal speaker

operation. When an external speaker is used, change the J551

jumper connections on the Transmitter/Receiver Board as

follows:

SPEAKER J551 CONNECTION

Internal J551-1 to J551-2

External J551-2 to J551-3

Figure 5 - DTMF Microphone Modification

1 2 ... 9 10 11 12 13 14 15 16 17 18

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MLS MLSH041 Especificaciones Pagina 14

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