Service manual

Madrigal Audio Laboratories
P.O. Box 781
A
UDIOACCESS
TECHNICAL SERVICES
Middletown, CT 06457-0781
[phone]
FAX [phone]
PX-600FRK – PX-600 FIELD REPAIR KIT
SEPTEMBER 22, 1999
The Audioaccess Field Repair Kit has been developed for authorized Audioaccess installation companies to improve
servicing time and overall customer satisfaction of PX-600 systems. Field repair eliminates system downtime and the
cost of multiple trips to job sites to reinstall keypads and controllers. This kit contains socket parts and subassemblies
to perform simple repairs to Audioaccess KPS keypads and PX-600 controllers. We recommend that dealers bring
this kit on all Audioaccess installation and/or troubleshooting visits.
The following parts and quantities are included in each kit. Dealer costs are also included for reordering individual
components:
DESCRIPTION Part NO. LOCATION Qty DLR
EACH
DLR EXT
PX-600/KPS PARTS
Ribbon Cable for Programmer 705-1000-800 PX-600 PROG 1 $10.50 $10.50
Fuse 2 Slo Blo 664-2101-200 MAINS FUSE 6 $0.93 $5.58
Fuse 1.5 5 X 20 mm 664-1001-500 KEYPAD (NEW) 6 $1.47 $8.82
Fuse 1.6 Slo Blo 380-00160-00 KEYPAD 6 $0.78 $4.68
Fuse 500ma Slo Blo 380-00050-00 F 1301 (INTERNAL) 6 $0.69 $4.14
LTC485 Bus Driver 605-0485-008 U 1106 12 $3.45 $41.40
Keypad Processor Board 450-9862-100 KPS 4 $38.82 $155.28
Volume Control ass’y
926-0600-002-00
FRONT PANEL 1 $60.50 $60.50
Microprocessor 606-8055-000 U 801 1 $26.82 $26.82
SRAM 606-1244-000 U 804 2 $31.95 $63.90
V2.04 610-1204-000 U 803 2 $20.00 $40.00
Total Cost if purchased separately. $426.62
Total Kit Price
PX600FRK
$245.00
Please contact Audioaccess Technical Support at 888-691-4171 or 860-346-0896 from the job site when a specific
Audioaccess system malfunction occurs. Audioaccess will assist the installer in system diagnostics and possible on-
site repair. Below is a brief description of usage for some of the parts listed above.
1. LTC 485 Bus Driver – This eight-pin IC sends and receives communication data on the RS-485 keypad bus.
This device is located in each KPS keypad, PX-600, PX-603, and MRX-NT. The RS-485 transceiver is socket
mounted in KPS keypads manufactured after April 1, 1998 and in the PX-600 dating from 1995.
2. SRAM – This component provides the non-volatile memory in the PX-600. The SRAM “holds” all programmed
settings in a system. This is the second part to suspect after replacement of the LTC 485 driver for any functional
or source control related failure.
3. EPROM – This is the operating software for the PX-600. Version 2.04 is the current software version.
4. Microprocessor – The main “brain” of the system. This part may need replacement if RS-485, EPROM and
SRAM replacements result in continued system control errors.
5. Keypad Processor Board – A failed keypad may require the replacement of the entire keypad processor board.
Replacement of this board will result in the successful repair of 99% of remaining keypad related problems.
Note - KPS keypads mis-installed or damaged by EMI (Electro-Magnetic Interference) are not covered under the
Audioaccess warranty.
6. Volume Control Assembly – This volume control pot on the PX-600 and MRX controls the volume of Zone 6 in
these systems. A broken volume assembly will cause the system to “lock up” when zone 6 is “turned on”
inhibiting volume and source control in an entire system.
PX-600 Field Repair Kit.doc
Doc # AA92299