Onkyo TXSR-600 Service manual
Subject: TX-SR600
Service Setup for Driver PCB.
Ref #500-600-01
Technical Memo:
The service set up procedure given in this 2 page material
is a general overview of the amplifier circuit of TX-RS600
Surround Back channel. Since all the amplifiers have same
characteristic, it expected that the field technical staff will
make same application to the rest amplifiers.
To service the removable driver stage (page 1) one must
use external power supply having at least a 0~20vdc range
supporting both plus and minus side of the power supply in
reference to its ground. All components added must be
removed before re-mounting PCB as well.
The output stage (page 2) can use its own internal power
supply and all you may need is resistors as illustrated.
ONKYO by design employ's a number of jumper wires
between components that are easily access able from
component side. Using an Voltmeter, establish a location
of assumed component co-terminal and a jumper wire that
could easily be used for installing the temporary
components. This is often referred to as "co-terminal
point".
The following models do have same amplifier
characteristic where same service mode could be applied
to simplify service.
TX-DS595, TX-DS696, TX-SR500, TX-SR600,
TX-SR700
Why this method?
1. Receiver goes in to protect allowing very little time for
troubleshooting.
2. Amplifier may be oscillating getting too hot to quick and
or blows outputs and burning adjacent components.
3. The risk of extending the problem do to defective
v-amp stage components appears greater.
4. Because the old technique of removing output
transistors does not work or apply on such design.
5. The cost of replacing parts that are damaged do to
service error is too high not to mention time spent.
6. It provides the best safest way to confirm components
conditions section by section.
The component locations may differ, but service logistics
does apply the same.
ONKYO USA Corp. Service Department
svceng@onkyousa.com
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Subject: TX-SR600
Service Setup for Driver PCB.
Ref #500-600-01
Only one channel shown
R5095
R5115
Q5005
R5025
Input
Oscilloscope
Channel A
D5005
Q5015
R5055
Q5055
R5065
C5045
R5045
C5025R5105
C5115
R5075
C5105
C5085
R5085
Using this example on
could duplicate same t
other channels and tes
each and perform repa
where it is needed. Th
power supply must be
connected at the right
R14
R15
1k
R5035
1k
R5185
R14
R15
R5195
B+
NFB
B -
+
v
e
s
u
p
p
l
y
Oscilloscope Channel B
The driver PCB assembly can be tested separately simply by addi
temporary components R14 and R15 between Q5035 Emitter and
Q5045 Emitter. Must connect ground to where ground is applicabl
all connection on the PCB. The add on resistors Y connection is fe
back to the NFB via R5035 and should read 0Vdc when working
good. Q5035 Emitter will read 0 ~ +10vdc while Q5045 will read 0
v
e
s
u
p
p
l
y
-10dvc. The value of R14 and R15 can be 1kohm 1/6watt. Supply
voltage can be any where from 12vdc to 40Vdc having a common
ground. Variable bench power supply is preferred. Both plus and
minus supplies must be increased or decreased equally. The emitt
voltage at Q5035 and Q5045 are proportional of the supply voltag
divided by 5.3.
Must remove Add on resistors after completing service.
Note:
+ 0~25Vdc
R5
O
Q5035
+ 0~5Vdc
C5055
0V
C5095R5135
- 0~5Vdc
Q5045
R5175
- 0~25Vdc
1:26 amplification Ratio
to make sure circuit
performs well. The gro
must be connected at
inputs and where ever
needed.
Note
: Must remove all
and add on resistors b
assembling PCB.
Channel A
Channel B
Page 1
Gedion
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