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Radio Code fix.  7 Saabers Like This Post!
Posted by Gene N [Email]  (#1094)  [Profile/Gallery]
(more from Gene N) on Tue, 26 Feb 2019 20:29:39
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On January 14th, Snowmobile started a thread about 9-5 radios losing their memory when disconnected from the battery. This a chronic problem with the Harmon/Kardon Pioneer radios in the1999-2005 model years. Disconnecting the battery would put the radio automatically in the divorced state and display “Radio Code” on the SID. A Tech 2 would be required to remarry the radio to the car until the next time the power was interrupted. (Here is the original thread http://www.saabnet.com/tsn/bb/9-5/index.html?bID=277759/)
Like Snowmobile, I looked for a battery backup inside the radio and gave up when I couldn’t find one. I then suspected an EEPROM was the problem, but it would have been impossible to find, just by looking at the board. Snowmobile found this service manual for the 2004-2005 model years: https://elektrotanya.com/pioneer_fx-m2037_m2137_m2337.pdf/download.html
Once I saw that, I searched and found this manual for my model year, 2002: https://elektrotanya.com/saab_pioneer_fx-m2117_sm.pdf/download.html
The 1999-2001 years used a Pioneer FX-M2116, but it did not seem to be significantly different from the FX-M2117 or the FX-M2137.
That is the background. You can skip to the next paragraph if you want while I descend deep into Electrical Engineer nerd-speak. The EEPROM from the schematic is a Seiko S-29220A Serial EEPROM with a capacity of 2k bits in a 128x16 bit organization, with a data retention value of 10 YEARS. The S-29220A is no longer available and dmz789qqq suggested using a 93AA56B-I/P serial EEPROM as a replacement, which is in a PDIP-8 through-hole package. Once I got the board out of the chassis and realized almost all components were surface mounted, I knew the 93AA56B-I/P was not going to work. The external dimensions of the EEPROM pointed to an SOP-J8 package that was not offered on the 93AA56B-I/P. The EEPROM I found that worked is a BR93G56FJ made by ROHM, and can be ordered from Mouser. Here is the link https://www.mouser.com/ProductDetail/ROHM-Semiconductor/BR93G56FJ-3AGTE2?qs=sGAEpiMZZMuVhdAcoizlRVBDy89uKeWDzWTE2%2F4gyPo%3D
The EEPROM is located on the tuner board. The front of the radio is on the bottom of this picture.
, Tue, 26 Feb 2019 20:29:39 <-- Viewing This Message
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, Wed, 27 Feb 2019 16:53:01, Wed, 27 Feb 2019 19:09:30, Wed, 27 Feb 2019 20:47:53, Wed, 27 Feb 2019 09:38:06, Wed, 27 Feb 2019 10:21:14, Wed, 27 Feb 2019 07:41:01, Tue, 26 Feb 2019 20:45:521, Sat, 2 Mar 2019 16:53:26
, Thu, 28 Feb 2019 06:42:02
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