Kenwood TKR-851 Service Manual page 9

2. Trickle Charge for Backup Battery
If the external DC power supply is connected to the Main
DC connector and a backup battery (12V rechargeable type) is
connected to the Backup connector at the same time, the
battery can be trickle-charged from the external DC power
supply with a maximum current of 0.5A.
Short the CHARGE land near R61.
Notes :
1. Make this modification after removing the DC power sup-
ply and battery for safety.
2. When the DC power supply is connected after the modifi-
cation, DC voltage is output to the Backup connector. Be
careful during setup.
3. When the backup battery is used for a long time, remove
the battery from the repeater and recharge it because the
trickle charge is not sufficient for recharging a completely
discharged battery.
MODIFICATION
CN7 BACKUP
(ORANGE)
CHARGE
TKR-851
Final unit (A/2)
Component side
K1
Fig. 2
9