Question about Blaupunkt Nassau CR127 Cassette Player
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
SOURCE: Blaupunkt flattening battery
I would be concerned about the amount of current required to kill a car battery in a week:
Let's assume that 1 week = 24 * 7 = 168 Hrs
A typical, healthy car battery will deliver anywhere between,
45 to 70 Ampere-hours at small currents, depending on the
size of the car (check your car owners manual)
Assuming a weak battery has a 40 Ampere-hour reserve, it would require an average current of 250 milliamperes to drain
in a week, or about 3 watts of power.
While this does not seem like a lot, it certainly indicates
something is wrong, because the clock and station memory
in a radio should take a lot less than that.
The first step is to make sure that the radio is actually at fault,
not damaged wiring or another one of the dozens of electronic
systems in a modern automobile.
Don't trust your mechanic on this, I have never met a gear-head
that was any good in electronics, but they do come up with
some fairly captivating fish-stories when they do not
understand something. :)
1) The first step is to disconnect the radio and isolate the
2) Remove the radio and hook it up to a 12V DC supply,
or battery through a digital milliamp-meter. Check the
current with the radio shut off.
3) Anything over about 10 mA or so is BAD.
4) If the radio draws any significant current with the switch
shut off, look for a bad switch or a leaky capacitor on the
B+ wire (before the switch, so it should not be hard to find)
Another possibility is the clock/keep alive controller chip,
but this is less likely. The most likely culprit is probably
an old leaky capacitor (electrolytic or solid tantalum),
since these do tend to fail with age, vibration and extreme
temperatures in a car environment.
5) If the radio is at fault, you will need some knowledge and
electronic instruments to find the problem yourself.
A quick way to check an electrolytic or tantalum capacitor
is with an ohm-meter. Connect ohm-meter to the capacitor,
and watch the reading race to infinity as the capacitor charges
up. Then reverse the leads and watch it again. Once charged,
the capacitor should have infinite impedance.
6) If the radio is not at fault, it could be dozens of other
problems, ranging from the body control computer,
immobilizer, remote starter, parking lights, door-locks,
alarm system, bad wiring ... you name it.
7) You should be able to isolate it by measuring the battery
current, while pulling fuses one at a time.
8) Another possible cause is the battery itself, or a bad
(shorted) diode in the alternator. The best way to check
the alternator is with an oscilloscope, while the car is
A bad diode will show up as a missing peak in the otherwise
regular pulse train.
9) Finally, don't over look the relays in the power distribution box.
These can over heat and stick in the ON position with the
ignition turned off.
Good luck, Martin
Posted on Jun 13, 2008
If your unit has a SRC button to the right of the CD clot, try holding this down for a few seconds - works on mine!
Posted on Feb 28, 2009
Tips for a great answer:
Dec 15, 2015 | Cars & Trucks
Apr 26, 2014 | 1992 Mercedes-Benz Mercedes Benz 300 Class
Sep 20, 2010 | Blaupunkt Nassau CR127 Cassette Player
Sep 19, 2010 | 1987 Mercedes-Benz 300-Class
Apr 04, 2010 | Mercedes-Benz 300-Class Cars & Trucks
Dec 08, 2009 | 1984 Mercedes-Benz Mercedes Benz 300 Class
Jul 28, 2009 | 1984 Mercedes-Benz Mercedes Benz 300 Class
58 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: