Note For Printed Wiring Boards And Schematic Diagrams; Waveforms; Circuit Boards Location - Sony HCD-GX25 Service Manual

HCD-GX25/RG220

5-5. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• : Pattern from the side which enables seeing.
(The other layer's patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
• Indication of transistor.
C
Q These are omitted.
B E
Q
B C E
These are omitted.
Q
B C E
These are omitted.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1 / W or less unless otherwise
4
specified.
• 2 : nonflammable resistor.
• C : panel designation.
Note: Note:
Les composants identifiés
The components iden-
tified by mark 0 or dot- par une marque 0 sont cri-
ted line with mark 0 tiques pour la sécurité.
Ne les remplacer que par
are critical for safety.
une piéce portant le numéro
Replace only with part
number specified. spécifié.
• A : B+ Line.
• B : B– Line.
• Voltage and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : CD PLAY
[ ] : TAPE PLAY (DECK-A)
{ } : TAPE PLAY (DECK-B)
〈〈 〉〉 : REC
∗ : Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: TUNER (FM/AM)
J
: CD PLAY
E
: TAPE PLAY (DECK-A)
d
: TAPE PLAY (DECK-B)
G
: REC
j : MD (VIDEO) IN
N : MIC INPUT
• Abbreviation
CND : Canadian model
AUS : Australian model
RU : Russian model
EA : Saudi Arabia model
MX : Mexican model
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to about
350 °C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may also
be added to ordinary solder.
30

5-6. WAVEFORMS

– BD Board – – MAIN Board –
(CD PLAY mode) (REC mode)
1 qa
1.3Vp-p
IC721 4 (RF)
qs
2
Approx.
180
mVp-p
IC721 qd (FE)
3
Approx.
150mVp-p
qg (TE)
IC721
4
4Vp-p
16.9344MHz
IC721 (XOUT)
rk

5-7. CIRCUIT BOARDS LOCATION

TRANS board
MOTOR (LD) board
PANEL board
REMOTE board
1 STREAM LED board
GAME JACK board
H/P JACK board
30
– PANEL Board –
1
1.7Vp-p
32.768kHz
11.3µs
IC601
Q223 (Base)
2
15.8Vp-p
8.64MHz
11.3µs IC601
Q223 (Collector)
VIDEO OUT board
SW board
SENSOR board
BD board
MOTOR (TB) board
DRIVER board
MAIN board
AMP board
1.2Vp-p
(XT1)
qs
1Vp-p
(CF1)
qg