Unknown. If you have any
information on this battery charger
let me know.
TM 11-5820-890-30-4 (Chapter 14) shows a "Battery Tray" CY-8664/VRC
(NSN 6160-01-339-7723) that's described as a way to use the CY-8523()
as a backup power source in a vehicular installation, but not as a
charger. When the button is pressed if the lamp lights then the
battery has power and if not it should be changed. Aimed at use
with a BA-5590 and has the charging function disabled. Used in
conjunctin with the MX-10862/VRC Power Supply Adapter.
TM 11-5820-890-30-4 Fold Out 26 CY-8664 schematic has many common
features with the
PP-8249. The parts layout drawing in TM 11-5820-890-30-5 Fig 15-6
looks identical to the PP-8249. The connector pinout is:
- A & D = Ground to MX-10862 J4 pins A & E.
- F= +27 from vehicle supply by means of CX-13290 cable to MX-10862
J4 Power Supply adapter pin F
- E = Un Interputable + 13 VDC from "Battery Tray" thrugh CX-13290
to MX-10862 J4 pin D
Note that the CY-8664 shows that the charging capability has been
disabled. It very well may be that the PP-8249 is the same unit
only with charging enabled by making the connection But
it's not clear how the charging conductor to pin U on the battery box
is broken. If you have a CY-8664 would you let me know?
S1 & DS1 Battery Check
The battery test lamp should light when
vehicle power is present and the battery is good. Since DS1 uses
a 28 volt bulb it will not light without vehicle power, i.e. it will
not light with just a good battery.
Contr No DAAB07-84-C-K503
Ser No 001063AA
Inside there's an LM117 adjustable
voltage regulator that the data sheet shows can be used as a battery
charger where the voltage and output impedance can be independently
controlled thus allowing you to set the initial current and float
voltage for a battery. It's a DC charger
- A = Ground
- F = Red wire
- E = Orange wire (also has a 15 V 10 Watt Zeener in parallel
An IC marked A1A91 45B, 5962-8771, 001PA <delta>/C, a 1N2222A, a
couple of relays, one a small standard can type DPDT and another DPDT
but rated for 28V 10 Amps.
Although there appeared to be a blue
wire going from the system connector PCB terminal E2 to the main PCB,
it had the other end shrink wrapped and was hidden in a bundle of
wires. After connecting the blue wire to E9 on the PCB (no wire
was on E9 and it's correct from the schematic) then with a discharged
battery installed the voltage across the 3R9 resistor was measured to
be 1.247 Volts (the reference voltage of the LM117 used as a CV-CC
power supply for battery charging). 1.247 V / 3.9 Ohms is 319 ma,
but the power supply was delivering about 500 ma at 30 Volts.
With the BB-390 removed the current is about 80 ma, so about 420 ma of
charging current is being supplied.
Without a battery, but with the blue wire grounded the output of the
Battery Charger is 15.64 Volts and the supply current is 500 ma.
Diode VR1 is a high power Zeener and it draws charging current when no
BB- type battery is installed and the blue wire isjumpered to ground
(fooling the charger into operating when it normally would not so the
output voltage can be checked, but that voltage is just the zener
voltage at half an amp (15.59 V)
By changing the 3R9 resistor to maybe 10 Ohms the charging current
would be reduced to a value (<C/10) that could be continuously
applied to a BB-390 or BB-590 battery without overheating it. BUT
THIS HAS NOT YET BEEN TESTED.
After getting an MX-10862 Power
Supply/Adapter for the RT-1439
radio but before the Mount arrived I thought that I could power the
radio through the MX-10862 by using the PP-8249 and a CX-13290 cable,
but no joy. After trouble shooting the PP-8249 a burned PCB trace
was repaired using a jumper. But still no joy. Footnote 1
on TM 11-5820-890-30-5 FO-21 says that in order for the CY-8664 battery
tray to supply power from the battery the vehicle input voltage must be
between 2.0 and 32 volts. Note is does not say zero volts.
This is confirmed by the schematic, there's no way either the CY-8664
or PP-8249 will work without at least 2 volts vehicle supply on the
The K1 power relay coil PCB trace to ground was smoked. This can
be checked with an Ohm meter reading between pins A and F on J1.
Should be under 300 Ohms but measured in the Meg Ohms. Checking
the actual relay coil terminals showed that the relay was OK.
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