– 5 –
In such a case, check also if the POWER AMPLIFIER circuit or power supply circuit has any abnormalities or not.
2-2. Regarding reset
There are cases that the machine does not work correctly because the MICROCOMPUTER is not reset even though the AC power
cord is re-inserted, or the software reset (pressing the STOP key + POWER key) is performed.
When the above described phenomenon occurs, it can lead to wrong judgement as if the MICROCOMPUTER is defective and to
exchange the MICROCOMPUTER. In such a case, perform the forced-reset by the following procedure and check good or no
good of the MICROCOMPUTER.
1
1
1
1
1
Remove the AC power cord.
2
2
2
2
2
Short both ends of the electrolytic capacitor C113 that is connected to VDD of the MICROCOMPUTER with tweezers.
3
3
3
3
3
Connect the AC power cord again. If the MICROCOMPUTER returns to the normal operation, the MICROCOMPUTER is
good.
Note:
The reference number or MICROCOMPUTER pin number of transistor (Q110) and electrolytic capacitor (C113) can change depending
on the models. Be sure to check the reference numbers on schematic diagram before starting the discharging work.
2-3. Confirmation of soldering state of MICROCOMPUTER
Check the soldering state of the MICROCOMPUTER in addition to the above described procedures. Be sure to exchange the
MICROCOMPUTER after surely confirming that the trouble is not caused by poor soldering but the MICROCOMPUTER itself.
Fig-2-2
MICRO-
COMPUTER
MICR
OCOMPUTER
FRONT C.B
FRONT C.B
VSS
VDD
C113
*
%
C113
18
15
Short with tweezers.
Summary of Contents for XR-DV826
Page 13: ... 13 BLOCK DIAGRAM 1 DVD MAIN ...
Page 14: ... 14 BLOCK DIAGRAM 2 MAIN FRONT MIC AMP IF AMP PROLOGIC PT DECK ...
Page 16: ... 16 SCHEMATIC DIAGRAM 1 MAIN 1 4 AMP SECTION VM3 ...
Page 17: ... 17 SCHEMATIC DIAGRAM 2 MAIN 2 4 TUNER SECTION TO MAIN C B 1 4 AMP SECTION 1A 13A ...
Page 18: ... 18 SCHEMATIC DIAGRAM 3 MAIN 3 4 DECK SECTION HEAD 1 HEAD 2 ...
Page 19: ... 19 SCHEMATIC DIAGRAM 3 MAIN 4 4 PRO LOGIC SECTION ...
Page 22: ... 22 SCHEMATIC DIAGRAM 5 FRONT CD KEY MIC DECK ...
Page 26: ... 26 SCHEMATIC DIAGRAM 6 AMP 1F ...
Page 28: ... 28 SCHEMATIC DIAGRAM 7 AMP PROLOGIC ...
Page 30: ... 30 SCHEMATIC DIAGRAM 8 PT ...
Page 32: ... 32 FL BJ789GNK GRID ASSIGINMENT ANODE CONNECTION PIN CONNECTION ...
Page 33: ... 33 IC BLOCK DIAGRAM ...
Page 34: ... 34 ...
Page 35: ... 35 ...