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REVISION HISTORY
REV DCA
DATE
SEE CHANGE RECORD FOR COMPLETE DOCUMENT REVISION HISTORY
AA W17921
04/17/18
This document is not complete without HTML file: SM55-3-PTA12-300-MM.AB.html
NEITHER RECEIPT NOR POSSESSION OF THIS DOCUMENT CONFERS ANY RIGHT TO REPRODUCE, USE OR DISCLOSE, IN WHOLE OR IN PART, ANY
INFORMATION CONTAINED IN THIS DOCUMENT WITHOUT WRITTEN AUTHORIZATION FROM WULFSBERG ELECTRONICS.
TEMPLATE 150-744502-01 REV. A
A
PRINTED
COPY OF THIS DOCUMENT MAY NOT BE THE
LATEST REVISION.
IT IS THE USER'S RESPONSIBILITY TO ENSURE THAT HE OR
SHE IS USING THE LATEST DOCUMENT REVISION.
THE LATEST REVISION MAY BE VIEWED OR PRINTED FROM THE
ELECTRONIC DOCUMENT DISTRIBUTION SYSTEM.
Typed signatures indicate approval. Handwritten signature approval of
this document is on file at Wulfsberg Electronics, Prescott, Arizona.
COBHAM PRIVATE
DRAWN
Barb Page
2018.04.17
14:11:57 -07'00'
IMPORTANT NOTICE
Chelton Avionics Inc. doing business as Cobham Aerospace
Communications is responsible for full distribution and
revisions of ICA's (Instructions for Continued Airworthiness).
For inquiries regarding the content and currency of this
manual contact Chelton Avionics, Inc., 6400 Wilkinson Drive,
Prescott, Arizona, 86301. Telephone (928) 756-1615 or refer
to the following website:
information.
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION.
Refer to the DCA and associated markups for a complete description of
the changes incorporated in a revision.
CHECKED
Digitally signed by John Rodriguez
Date: 2018.04.18 07:37:21 -07'00'
www.wulfsberg.com
for more
Chelton Avionics, Inc.
dba Wulfsberg Electronics Division
Prescott, AZ
DOCUMENT TITLE
MAINTENANCE MANUAL, POTS
TELEPHONE ADAPTER W/NVIS DISPLAY
LRU
SIZE
PTA12-
A
300
SCALE: NONE
APPROVED
PUBLISHED
Digitally signed by David Urban
Date: 2018.04.18 07:50:08
-07'00'
These commodities, technology or software
Are Controlled in accordance with the United
States Export Administration Regulations.
When exporting from the United States;
Diversion contrary to U.S. Law is prohibited.
DOCUMENT NUMBER
SM55-3-PTA12-300-MM
DO NOT SCALE DRAWING
2018.04.18
Published
08:08:29
-07'00'
CAGE
CODE
1WZE2
REV
AB
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Table of Contents
Summary of Contents for COBHAM PTA12-300
- Page 1 Are Controlled in accordance with the United States Export Administration Regulations. When exporting from the United States; -07'00' Diversion contrary to U.S. Law is prohibited. This document is not complete without HTML file: SM55-3-PTA12-300-MM.AB.html IMPORTANT NOTICE Chelton Avionics Inc. doing business as Cobham Aerospace Communications is responsible for full distribution and revisions of ICA's (Instructions for Continued Airworthiness). For inquiries regarding the content and currency of this manual contact Chelton Avionics, Inc., 6400 Wilkinson Drive,...
- Page 2 PTA12-300 POTS Telephone Adapter with NVIS Display COBHAM PRIVATE This document contains Page 2 of 16 SM55-3-PTA12-300-MM Rev AB proprietary information, see proprietary statement on first page.
- Page 3 Section 6 – add document 556016-913-0 Updated to electronic format Section 5.2 - update Continued Airworthiness statement Section 6 - Add the following documents: PTA12-300-701-0 revisions 1.21, 1.32, 1.33, and AA PTA12-300-518-0 revision 1.11 PTA12-300-614-0 revisions 1.11, 1.12, and 1.13 PTA12-6A-401-0 revision 1.31 PTA12-6-701-0 revisions 1.21, 1.22, 1.23, and AA...
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Page 4: Table Of Contents
6.2.2 Product Test and Alignment Subassembly Documentation and Drawings 6.3.1 Subassembly 6.3.2 Subassembly Test and Alignment Bulletins Introduction Bulletin Listing COBHAM PRIVATE This document contains Page 4 of 16 SM55-3-PTA12-300-MM Rev AB proprietary information, see proprietary statement on first page. -
Page 5: Introduction
4.3.1 Main Subassembly The Main subassembly contains the majority of circuits for the PTA12-300. All input and output signals to the product pass through the Main subassembly. Internal to the product, the Main subassembly interfaces to the Front Panel subassembly with a flat cable. The individual function blocks of the Main subassembly will be described in greater detail in the following sections. - Page 6 The +5 Vdc LED power supply is fed directly from the main power supply fuse. This supply is also over-voltage, over-current and reverse polarity protected. This supply is a switch mode buck regulator that converts +28 Vdc to +5 Vdc and is used solely to power the PTA12-300 front panel annunciator LEDs and the front panel display.
- Page 7 The serial port is a three line RS232 port consisting of SERIAL RX, SERIAL TX and ground. The serial port is connected to a UART contained within the microcontroller. The microcontroller has complete control of the serial port. The serial port RX and TX are fed directly to the PTA12-300 external connector. 4.3.1.8 DTMF Encoder The DTMF encoder uses a 3.579 MHz crystal as a reference to generate tones.
- Page 8 The Mic Bias circuit provides a +13 Vdc bias on the MIC HI line. This is needed for applications in which a microphone is connected directly to PTA12-300 MIC HI/MIC LO and the microphone requires a DC bias to operate. This bias may enabled/disabled by an externally accessible mini-switch labeled MIC.
- Page 9 The amplified audio is then fed to the primary winding of an audio transformer for amplitude step up conversion. The audio transformer also provides isolation from the phones amplifier and the external connections. The secondary winding of the audio transformer is connected to the PTA12-300 external connector.
-
Page 10: Front Panel Subassembly
Backlighting power may be supplied by +28 Vdc or +5 Vdc. The backlighting power is applied to the PTA12-300 external connector. The presence of either +28 Vdc or +5 Vdc backlighting is sensed and feeds the LED & Display Dimming circuit. The backlighting signal is then fed to the Lights Level potentiometer to allow for intensity adjustments. -
Page 11: Display Subassembly
These signals originate on the main subassembly and are routed through the front panel subassembly. The display subassembly simply contains two dot matrix character displays that are viewed on the front panel of the PTA12-300. Section 4 ends COBHAM PRIVATE... -
Page 12: Introduction
There are no new (or additional) airworthiness limitations associated with this equipment and/or installation. Maintenance of the PTA12-300 POTS Telephone Adapter with NVIS Display is ‘on condition’ only. Periodic maintenance of this product is not required. DISASSEMBLY/REASSEMBLY Refer to Exploded View PTA12-300-904-0 for all disassembly/reassembly procedures. Reference Section 6 for supporting documentation and drawings. -
Page 13: Reassembly
Remove Main subassembly SA1 from chassis M1 by unfastening four panhead screws M8. Note: This PTA12-300 faceplate is not user serviceable. If the unit malfunctions, it should immediately be returned to the factory for any necessary repair or service. 5.3.2 Reassembly To reassemble the unit reverse the procedures outlined in 5.3.1 with the additional steps listed below:... -
Page 14: Documentation And Drawings
PTA12-300 POTS Telephone Adapter with NVIS Display. Review all notes, warnings and cautions. DOCUMENTATION AND DRAWINGS Alternate manufacturers' part numbers may be used. Consult Cobham for approved alternate parts. 6.2.1 Product Documents This is an HTML file containing hyperlinks to all relevant files and can be accessed here. -
Page 15: Subassembly Test And Alignment
Do not take a ground from the instrument panel or similar location that shares a ground return with a turn and bank, horizon or other motor driven instrument. This may cause the PTA12-300 unit to pick up the sound of the motor as ground loop interference. -
Page 16: Introduction
Section 7 Bulletins INTRODUCTION Service and Information Bulletins released by Cobham are available in Section 6 html. BULLETIN LISTING Bulletin Subject Date Issued Number 603-0001 Annunciator luminance. (MOD 2) Jan 4, 2007 603-0002 Luminance Too High. (MOD 3) Apr 19, 2007 603-0003 HOLD noise levels.
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