Gp68 Option Board; Installation; Option Board Enable Procedure; Dtmf Decode Option - Motorola GP68 Service Manual

Accessory

GP68 Option Board

GP68 Option Board
(Only applicable for GP68 Radios)

Installation

Please refer to Figure 3-4.
1. Dismantle the radio by Þrst removing the
chassis from the front housing. See drawing
above. (Refer to Section 1 - Radio Disassem-
bly/Assembly for instructions on dismantling
the radio).
NOTE
When separating the chassis from the front
housing, be careful not to overstress the inter-
connect flex connecting the RF Board to the
Controller Board.
Top DTMF Pad
12 Pin Male
Connector
DTMF Decode
Option Board
Front
Housing
Controller
Board
12 Pin Female
Connector
Figure 3-4. Exploded View of the Radio with DTMF Op-
tion Board
2. Remove the protective liner from the double-
faced adhesive located on the foam pad (on
the same side of the logic board as the 12-pin
male connector). Orient the Option Board so
that the 12-pin male connector is at the lower
edge and facing downwards. See Figure 3-4.
3. Attach the Option Board to the Controller
Board by inserting the 12-pin male connector
into the 12-pin female connector on the Con-
troller Board. Push until it is securely in place.
4. Re-assemble the radio.
3-4

Option Board Enable Procedure

The programming options are Selcal, Decode and Serial. To
enable one of these options, turn the radio off, press and hold
the
runk II™ options screen will appear on the display. The
default is ´OPt.OFF´ . Press the
the options, SEL.CAL, dECOdE, and SEriAL . Select the
´dECOdE´ option for the DTMF option board.
If you are installing the SmarTrunk II™ option board, select
´SEriAL´ . When the correct option is selected, turn the radio
off to save it to memory.

DTMF Decode Option

Kit numbers: PMLN 4063 — Decode Board

Overview

The DTMF Decode Option Board is an accessory available
with the GP68 portable radio. This board requires the radio to
be disassembled before it can be installed. Please follow the
instructions below carefully.
RF Board

Description

Interconnect Flex
The Motorola DTMF Decode Option Board is designed for
compatible Motorola Radios. Check with the latest price
Chassis
pages or your nearest Authorized Dealer to confirm compati-
bility. The connection is made to the option interface on the
Controller Board. When your radio is equipped with this
DTMF Decode Option Board, your radio will be able to
decode DTMF Selective Call signals.

Theory Of Operation

A DTMF tone pair will be sent to Ain(U701-8), then
DV(U701-14) will signal a detection by going high after a
Display Board
valid tone pair is sensed and decoded at the output pins
D1(U701-2), D2(U701-1), D4(U701-16) and D8(U701-15).
The DV will remain high until a loss of the current DTMF sig-
nal occurs. The transition of this DV signal (from high to low)
will be used to acknowledge the micro-P at the main board.
When DV is high, the shift register will latch the decoded tone
from the DTMF decoder (U701) through parallel ports. The
shift register then arranges the 4-bit decoded signal from
DTMF decoder (U701) and places into serial form, where D8
is the most significant bit, followed by D4, D2, D1 and finally
four more high bits.
The microcontroller of the main board senses a transition of
DV(U701-14) from high to low. The microcontroller will then
send a serial clock to the 8 bit static shift register clock (U702-
10) and retrieve the signal from Q8(U702-3).
6881086C09-O
GP68 Portable Radios Service Manual
key, and turn the radio on. The DTMF and SmarT-
and
PMLN 4064 — Decode Board (10-pack)
H H H H D1 D2 D4 D8
LSB
keys to show
MSB
March, 1997