Motorola Gp68 Part1 6881086c09 O Manual

 
March, 19976881086C09-O
 
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 6,7,8,9,12,14,17,18,19,21,22,24
 
2
4
5
10
11
15
16
31323 1,20
 
Low
Pass
Filter
 
  
 Ext.
 Buffer
 (UHF Only)
 
Attenuator 
Low
Pass
Filter
 
 
TX RF INJECTIONLO RF INJECTION
Rx
BufferTx
Buffer
Prescaler
  BufferTx/Rx/BS
Switching
 NetworkRx
OscTx
Osc
 
Low
Pass
Filter
 
 
Rx
Tank
Tx
Tank
Tx VCO
Modulation
AUX 3 (U201 pin 1)
FILT 5V (U201 pin 18)
PRE-IN (U201 pin 20)AUDIO
   IN STEERING
LINE
VOLTAGE
PRESCALER RF OUT
 
VCO BLOCK DIAGRAM 
GND VC
VCCTRB 
DATA
CLK
CEX...

 
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6881086C09-OMarch, 1997
 
RX INPUT
BUFFER
sample & holds
3rd order LP
Fc = 3 khzPL REJECTION
FILTER
7th hp Fc = 300 hz
0.2 db ripple chebyDE-EMPH
1 pole LP
Fc = 231 hzsumming
smoothing
stage 
1 pole LP
Fc = 9 khzBUFFER
Fc = 9 khz
PL filter
6 pole LP
Fc = 252.5 hzALERT TONE
GENERATORDIGITAL 8-BIT
VOLUME ATT
1 POLE LP
Fc = 9 khzBUFFER
Fc = 30 khz
anti-aliasing
1 pole LP
Fc = 1 khz
DPL FILTER
3 pole LP
Fc = 150 hz SMOOTHING FILTER
1 POLE llp
Fc = 6050 hzGAIN/BUFFER
STAGE
PA AUDIO
MC34119
&
EXT....

 
March, 1997 6881086C09-O
 
3-1
 
Section 3
Accessory 
Remote Speaker Microphone 
Overview 
The remote speaker microphone is an accessory available
with the GP68 Series portable radio. This section provides a
general description of the remote speaker microphone and
describes the operation, handling precautions, and mainte-
nance of this accessory. 
Description 
The Model HMN9725 Remote Speaker Microphone
includes a speaker, a microphone, a push-to-talk (PTT)
switch and associated circuitry. A cable,...

 
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6881086C09-OMarch, 1997
 
AccessoryGP68 Portable Radios Service Manual
Remote Speaker Microphone
 
Maintenance 
Refer to the schematic diagram (shown in Figure 3-2), the
exploded view (shown in Figure 3-3), and the parts lists.
Every part in the microphone is identified and illustrated for
assistance in removal and replacement. If necessary, the
external surfaces of the remote speaker microphone may be
cleaned with a 0.5% solution of mild dishwashing detergent
in water (one teaspoon of detergent...

 
March, 19976881086C09-O
 
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GP68 Portable Radios Service ManualAccessory 
Remote Speaker Microphone
 1
2
 34
 5
68
9  
11
10  7 12 13 14  15  16  17 18  19  20 21
Figure 3-3.Exploded View
Parts List
HMN9725 Remote Speaker Microphone                      PL-931024-O
REFERENCE 
SYMBOLMOTOROLA 
PART NO.DESCRIPTION
10105953N42Front Housing, items 1 thru 5
23305259Q01Nameplate, Motorola
34505182Q01Lever, PTT
43505152J01Grille, cloth
51105461R01Adhesive
60180703Y70Coil cord & connector
70180703Y67PCB:...

 
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6881086C09-OMarch, 1997
 
AccessoryGP68 Portable Radios Service Manual
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...

 
March, 19976881086C09-O
 
3-5
 
GP68 Portable Radios Service ManualAccessory 
GP68 Option Board
 
Packing List 
DTMF Decode Option Board
DTMF Decode Signalling Retrofit Kit Instruction (English) 
Programming DTMF Codes 
Dealer Programming 
You may now program the DTMF Decode codes into the
radio. Enter the Special Programming Mode by pressing the
 key, then turn the radio on. Each code entered may
be up to 8 digits, using any of the numeric keys and the
, , , , or  keys.
Rotate the selector switch until...

 
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6881086C09-OMarch, 1997
 
AccessoryGP68 Portable Radios Service Manual
DTMF Decoder Option Board (PMLN4063)
 
DTMF Decoder Option Board (PMLN4063)
C701 R706 C706 R703
R705C705
C704
U701VIEWED FROM SIDE 2
R702
J701
C703
CR701
C702
11
18
89
9
16
16
6 7 12
+
R704
U702
Y701
R701
ILLUSTRATORDATEENGINEER DATE
ME
LETTERING SIZE:
REQUIRES:
EDITORDATECHECKER DATE
GP68 DTMF
MAEPF-25975-O
JP
AM/RG1/9/97
TP2TP1TP4TP5
TP6TP3 VIEWED FROM SIDE 1
MAEPF-25974-O
Circuit Board Details
for DTMF Decoder Option Board...

 
March, 19976881086C09-O
 
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GP68 Portable Radios Service ManualAccessory 
DTMF Decoder Option Board (PMLN4063)
 
Parts List
PMLN4063A, DTMF Decode Signalling Retrofit Kit
REFERENCE
SYMBOLMOTOROLA
PART NO.DESCRIPTION
CAPACITOR, Fixed : +-5%;
50V unless stated 
C701, C7022113741F4910nF
C7032311049J2610uF, 16V
C704, C7052113740F3830pF
C706 --------- Not Placed 
DIODE : 
CR7014813833C07Diode 
CONNECTOR : 
J7012804652J0112 Pin Connector 
RESISTOR, Fixed : ohm +-5%;
.0625W unless stated...

 
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6881086C09-OMarch, 1997
 
AccessoryGP68 Portable Radios Service Manual
DTMF Decoder Option Board (PMLN4063)