Onkyo TX-7620 - Remote Control Transmitter; Service Procedures

REMOTE CONTROL TRANSMITTER RC-144
Transmitter: Infrared
Signal range: Approx. 5 meters (16ft.4”)
Power supply: TWO “AA” batteries (1.5V x 2)
Specifications
and
features
are
subject
to
change
without
notice.
SERVICE PROCEDURES
1.Replacing the fuses
For continued protection against fire hazard,replace
only with same type and same rating fuse.
Circuit no. Part no. Description
F902 252074 2A-SE-EAK,Primary
2.Changing the band step
With the exception of the models below, a BAND STEP
selector switch is not provided.
(FM)
MODEL
UG/UQ
(AM)
BAND STEP D712
10kHz->9kHz | Additional
9kHz—10kHz | Eliminated
In D712 ISS133 (Part No. 223163) is used. In D713 US1040
(Part No. 223150) is used. R101, with the muting amplitude
determined, is on the back panel side of the tuner circuit
printed circuit board assembly test points TP—1 and TP-2.
(Refer page 13)
D713
TAPE i
-O}-
D7Il2
3.Memroy preservation
This unit does not require memory preservation batteries.
A built-in memory power back-up system preserves contents
of the memory during power failures and even when the
unit is unplugged. The unit must be plugged in and the
power switch turned on and off once in order to charge the
back-up system. Note that since this is not a permanent
memory,the power switch must be turned on and off a few
times each month to keep the back-up system operative.
The period of time during which memory contents are
preserved after power has last been turned off varies
depending on climate and placement of the unit.
On the average, memory contents are protected over a
period of 3 to 4 weeks (a minimum of 2 weeks) after
the last time power has been tumed off. This period is
shorter when the unit is exposed to very high humidity or
used in an area with an extremely humid climate.
ip Cr4-y40)