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4.2
TEST POINTS
4.2.1
Preparatory steps
• Oisconnett toe power cord from the AC outlet.
• Remove the top toyer (Section 2
.
2.1>.
• Reconnect the
unit
to the At outlet
.
Abbreviations:
The followIng tables list the signal names or terminals
of the components.
The following system of abbreviations
is
used:
TP
J2.1
E .Q9
B.Q2
C.
Q2
: te5t poInt with soldering
: connector
J2,
contact
1
emitter of transistor Q9
base of transistor Q2
=
collector of transistor Q2
pin
4.2
.
2 DECOOER BOARO A727 1.769.430
Signal
MeilsuJ'ed
Measuring conditions
naMe
value, nom.
TP 1 DEEM
-15.0 V
co
without preemphasis
+12.0 V
CO
with preempha5i,
TP 2
HAS
0.0 V
Play mode with erJ'or-fJ'ee CO
~5.0
v
Pulse for damaged CD
TF
3
HF
1.5 VPD
Play mode with error-free CD
TP
~
D-GNO
0.0 V
J2.1
A-GNO
0.0 V
J2 .2 -15 V
-15.0 V
-
r
~
'1.
J2
.
3
+12
V
+12.0 V
-
\
"')
-
~
-~,
J2.~
- 5 V
-5.2 V
,:....
\
~
JZ.S
... 5
V
+5.2 V
<;
~
'
-,
cb
·0
A727
,
-
- - -
-
- --
- - - - - -
---
- -
---
---
-- - -
---...,
-
+-
-- ----------------
- - - -
--
-- - - ----==--
--,
~
-
-_'"::
o
c:>
€!>
o
TP4
TP3
TP2
TP1
J2
'
\.-\
Fig. 4.1
E 4/2
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