Cda-7940

SS64 · 14th June 2009, 06:19 PM

I need some help repairing this Alpine 7940 that was just given to me.. It does not power on so that leads me to believe there is something wrong in the internal psu?..... The guy touched the + lead to the case.. And upon opening I find D801 blown and cracked.. Any help? or is it even worth messing with?

I Am An Idiot · 14th June 2009, 11:47 PM

If D801 is located very near the plug, it is the reverse polarity protection diode. If it is visibly damaged, the radio was overfused and connected with power and ground reversed. Simply replace the diode and repair the burnt trace between the plug and the diode.

SS64 · 15th June 2009, 03:45 AM

Yes it is the reverse polarity diode that is blown but I cannot find any visibly burt parts or traces... and it still doesn't light up...

SS64 · 15th June 2009, 04:08 AM

I just took apart the external dc to dc converter and no burt parts there ether... I also just replaced the diode with no change..

I Am An Idiot · 15th June 2009, 04:27 AM

is there voltage getting to the diode and to the inductor and to the output chip?

SS64 · 16th June 2009, 03:17 AM

yes I am getting voltage though the plug and to the inductor.. And this unit is a pre out only head..

I Am An Idiot · 16th June 2009, 06:01 AM

Is there an IC mounted to a heat sink or to the back or side cover of the unit. If so, what is the number on the chip? And what is the location number, IC XXX

SS64 · 16th June 2009, 11:35 PM

No there is no IC... I see where it would go.. but this unit is a dead head and has 3 preouts.. and I do have voltage to where the IC would be....

I Am An Idiot · 18th June 2009, 01:18 AM

I am not talking about the output Chip. That unit may be too old, but there is a multiple voltage regulator on some of the newer units. HA13165 is the number. I have replaced a couple of them. If your unit has this part, I would begin checking there.

jpacparts · 24th June 2009, 10:50 PM

Here are a few items that PacParts Inc. stocks for your Alpine CDA 7940. I hope this helps. www.pacparts.com

01:ANTENNA PLUG 1:01T15513W23
02:WIRE HARNESS 2:01T75469W21
03

ETACHABLE FACE ASSY 3:01V14300Y78
04:MOTOR, LOAD 4:01V73300W33
05:MOTOR, SPINDLE 5:01V73300W35
06:MOTOR, SLED 6:01V73300W38
07:FRONT ESCUTCHEON 7:13C10783Y01
08:NOSE BOTTOM 8:13D10486Y01
09:NOSEPIECE 9:13T15458Y02
10:CARRYING CASE 10:15D10867Y01
11:MOUNTING SLEEVE 11:15D50406W01
12:TRIM RING 12:33C10618Y01
13:CONTROL KNOB KIT 13:36B10628Y01
14:VOLUME CONTROL 14:40T45670W05
15

ISPLAY 15:65T15625Y01
16:FL TUBE LOC# CFL401 16:65T25014Y02
17:LAMP PL401/402/405/406 17:65T75233W01

14th June 2009, 06:19 PM	#1
SS64 diyAudio Member Join Date: Mar 2008	Cda-7940 I need some help repairing this Alpine 7940 that was just given to me.. It does not power on so that leads me to believe there is something wrong in the internal psu?..... The guy touched the + lead to the case.. And upon opening I find D801 blown and cracked.. Any help? or is it even worth messing with? __________________ It isn't fun unless it can kill you!

14th June 2009, 11:47 PM	#2
I Am An Idiot diyAudio Member Join Date: Mar 2007	If D801 is located very near the plug, it is the reverse polarity protection diode. If it is visibly damaged, the radio was overfused and connected with power and ground reversed. Simply replace the diode and repair the burnt trace between the plug and the diode. __________________ If it ain't broke Don't fix it

15th June 2009, 03:45 AM	#3
SS64 diyAudio Member Join Date: Mar 2008	Yes it is the reverse polarity diode that is blown but I cannot find any visibly burt parts or traces... and it still doesn't light up... __________________ It isn't fun unless it can kill you!

15th June 2009, 04:08 AM	#4
SS64 diyAudio Member Join Date: Mar 2008	I just took apart the external dc to dc converter and no burt parts there ether... I also just replaced the diode with no change.. __________________ It isn't fun unless it can kill you!

15th June 2009, 04:27 AM	#5
I Am An Idiot diyAudio Member Join Date: Mar 2007	is there voltage getting to the diode and to the inductor and to the output chip? __________________ If it ain't broke Don't fix it


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16th June 2009, 03:17 AM	#6
SS64 diyAudio Member Join Date: Mar 2008	yes I am getting voltage though the plug and to the inductor.. And this unit is a pre out only head.. __________________ It isn't fun unless it can kill you!

16th June 2009, 06:01 AM	#7
I Am An Idiot diyAudio Member Join Date: Mar 2007	Is there an IC mounted to a heat sink or to the back or side cover of the unit. If so, what is the number on the chip? And what is the location number, IC XXX __________________ If it ain't broke Don't fix it

16th June 2009, 11:35 PM	#8
SS64 diyAudio Member Join Date: Mar 2008	No there is no IC... I see where it would go.. but this unit is a dead head and has 3 preouts.. and I do have voltage to where the IC would be.... __________________ It isn't fun unless it can kill you!

18th June 2009, 01:18 AM	#9
I Am An Idiot diyAudio Member Join Date: Mar 2007	I am not talking about the output Chip. That unit may be too old, but there is a multiple voltage regulator on some of the newer units. HA13165 is the number. I have replaced a couple of them. If your unit has this part, I would begin checking there. __________________ If it ain't broke Don't fix it

24th June 2009, 10:50 PM	#10
jpacparts diyAudio Member Join Date: Jun 2009	CDA 7940 parts replacement list from PacParts Inc. Here are a few items that PacParts Inc. stocks for your Alpine CDA 7940. I hope this helps. www.pacparts.com 01:ANTENNA PLUG 1:01T15513W23 02:WIRE HARNESS 2:01T75469W21 03ETACHABLE FACE ASSY 3:01V14300Y78 04:MOTOR, LOAD 4:01V73300W33 05:MOTOR, SPINDLE 5:01V73300W35 06:MOTOR, SLED 6:01V73300W38 07:FRONT ESCUTCHEON 7:13C10783Y01 08:NOSE BOTTOM 8:13D10486Y01 09:NOSEPIECE 9:13T15458Y02 10:CARRYING CASE 10:15D10867Y01 11:MOUNTING SLEEVE 11:15D50406W01 12:TRIM RING 12:33C10618Y01 13:CONTROL KNOB KIT 13:36B10628Y01 14:VOLUME CONTROL 14:40T45670W05 15ISPLAY 15:65T15625Y01 16:FL TUBE LOC# CFL401 16:65T25014Y02 17:LAMP PL401/402/405/406 17:65T75233W01

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