Circuit Boards Location - Philips ST-D777ES Service Manual

4-2. CIRCUIT BOARDS LOCATION

POWER board
AC SW board
DISPLAY board
KEY SW board
MAIN board
ENCODER board
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in
each block.)
For schematic diagrams.
Note:
• 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 speci-
4
fied.
• : internal component.
f
• C : panel designation
Note:
The components identified by mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part number specified.
• U : B+ Line.
• V : B– Line.
• Voltages and waveforms are dc with respect to ground under
no-signal (detuned) conditions.
no mark : FM
( ) : MW
< > : LW
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tol-
erances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production tol-
erances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f : AM
18 18
For printed wiring boards.
Note:
• X : parts extracted from the component side.
• b : Pattern from the side which enables seeing.
• Indication of transistor
B C E
These are omitted
• Waveforms
MAIN board
1 5
IC201 wf IC502 ta
4.6Vp-p
222.2ns
40.7ns
2 6
IC401 qf IC502 tf
2.2Vp-p
230.8ns
162.7ns
3
7
IC501 rg
IC601 yk
3.3Vp-p
100.0ns
40.7ns
4
IC502 qd
6.0Vp-p
20.3ns
5.6Vp-p
6.0Vp-p
3.5Vp-p