5. Changing the AM band step
The tuning step selector switch is not provided in this model.
When you change the band step, change the parts as shown
below.
To 10kHz
To 9kHz
R715
3.3k
10k
R716
5.6k
Open
6. Adjustment of clock frequency
1. Connect the frequency counter to the terminal TP701.
2. Press and hold down the MEMORY button, then press the
DISPLAY button.(All segments on FL tube light on)
3. Adjust the trimmer capacitor C707 so that the reading of
frequency counter becomes 524.288 kHz+/-1Hz.
4. Memory Preservation
This unit does not require memory preservation batteries. A
built-in memory power back-up system preserves the contents
of the memory during po wer f ailures and ev en when the unit is
unplugged.The unit must be plugged in order to char ge the
back-up system.
The memory preserv ation period after the unit has been
unplugged varies depending on climate and placement of the
unit. On the a v erage, memory contents are protected ov er a
period of a fe w weeks after the last time the unit has been
unplugged. This period is shorter when the unit is exposed to a
highly humid climate.
2. To initialize the unit
This device employs a microprocessor to perform various
functions and operations. If interference generated by an external
power supply, radio wave, or other electrical source results in
accident which causes the specified operations and functions to
operate abnormally.
To perform a result, please follow the procedure below.
1. Press and hold down the MEMORY button, then press the
DISPLAY button.
2. Press the STANDBY/ON button.
After "clear" is displayed, the preset memory and each
mode stored in the memory, such as surround, are
initialized and will return to the factory setting.
3. Safety-check out
(120V model only)
After correcting the original service problem, perform the
following safety check before releasing the set to the customer.
Connect the insulating-resistance tester between the plug of power
supply cord and screw on the back panel.
Specifications: 3.3Mohm+/-10% at 500V.
1. Replacing the fuses
This symbol located near the fuses indicates that the
fuse used is fast operating type. For continued protection against
fire hazard, replace with same type fuse. For fuse rating refer to
the marking adjacent to the symbol.
Ce symbole indique que le fusible utlise est a rapide.
Pour une protection permanente, n'untiliser que fusibles de
meme type. Ce darnier est la qu le present symbol est
appse.
CIRCUIT NO.
PART NO.
DESCRIPTION
F901
F902
252158
252083
252069
Note: <D>: 120V model only
<P/T>: 230V model only
1.6A-UL/T237, Primary <D>
0.4A-SE-EAWK, Primary
<P/T>
0.8A-SE-EAK,AC outlet
<P/T>
SERVICE PROCEDURES
R-805TX
