Pioneer RX-P840 Service Manual page 36

RX-P840
2.2 SCHEMATIC AND PCB CONNECTION DIAGRAMS
NOTE FOR SCHEMATIC DIAGRAMS (Type 1A)
1. When ordering service parts, be sure to refer to
"PARTS LIST of EXPLODED VIEWS" or "PCB
PARTS LIST".
2. Since these are basic circuits, some parts of them or the
values of some components may be changed for improve-
ment.
3. RESISTORS:
Unit: k:kQ, M:MQ, or 2 unless otherwise noted.
Rated power: 1/4W, 1/6W, 1/8W, 1/10W unless otherwise
noted.
Tolerance: (F): +1%, (G): +2%, (K): +10%, (M): +20% or +5% un-
less otherwise noted.
4. CAPACITORS:
Unit: p:pF or pF unless otherwise noted.
Ratings: capacitor (uF)/ voltage (V) unless otherwise noted.
Rated voltage: 50V except for electrolytic capacitors.
5. COILS:
Unit: m:mH or wH unless otherwise noted.
6. VOLTAGE AND CURRENT:
: Signal voltage at rated output.
\__lor+-V:
OC voltage (V) at no input signal unless otherwise noted.
Value in( ) is DC voltage at rated power.
© mA or- mA:
DC current at no input signal unless otherwise noted.
7% OTHERS:
©@ or @: Adjusting point.
e : Measurement point.
© The A mark found on some component parts indicates the im-
portance of the safety factor of the parts. Therefore, when re-
placing, be sure to use parts of identical designation.
8. SCH—O ON THE SCHEMATIC DIAGRAM:
¢ SCH-O indicates the drawing number of the schematic dia-
gram. (SCH stands for schematic diagram.)
9. SWITCHES (Underline indicates switch position):
$8001 VOLTAGE SELECTOR
AC110V/120- 127V/220V/240V
(SD ONLY)
DISPLAY assy
$1801 CLOCK-ADJ
$1802 TIMER REC
$1803. WAKE-UP
$1804 TUNING —
$1805 TUNING +
$1806 POWER
$1807 FUNCTION (DEMO)
$1808 FREQ. /STATION
$1809 AUTO TUNING
$1810 MEMORY
$1811 BAND
$1815 P. BASS
TAPE KEY assy
$1812 SFC MODE
$1813 ASES/COPY
$1814 Oil
$1816 TAPE1/2
$1817 DOLBY NA B/C/OFF
$1sia 4d
$1819 PP
$1821
$1822 <4
$1823
2-10
NOTE FOR PCB DIAGRAMS:
1. Part numbers in PCB diagrams match those in the schematic
diagrams.
2. A comparison between the main parts of PCB and schematic
diagrams is shown below.
Symbol in PCB} Symbol in Schematic Part Name
Diagrams Diagrams
Transistor
Q504 Q504
otto Diode
D203
oN
C513
3. The transistor terminal marked with E or C shows the emitter.
4. The diode terminal marked with© orC=shows cathode side.
5. us rst terminal marked with © or [ shows negative
rminal.
Capacitor
(Polarized)