Pioneer RX-P840 User manual

® PIONEER’
s The Art of Entertainment
aE
_
OA i a OFM Ol
Stee
Service
a
$F TPL
| 6
Manual 0) on
RRV1125
The
chapter
1
of
this
Service
Manual
will
not
be
reprinted.
On
your
additional
orders,
we
may
supply
only
the
chapter
2.
For
the
chapter
1,
please
make
copies
and
attach
to
the
chapter
2
at
your
side
if
necessary.
STEREO CASSETTE DECK RECEIVER
RX-P840
THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).
5 The voltage can be converted by the
Tape RX —P840 Power Roauseinent following method.
AC110V/120—127V/220V/240V
With
the
voltage
selector
VU
HB @ AC240V AC230V, *
KU oO AC120V _—
Ke
3
AGI20V
Sa
%*:
Alter
the
wiring
of
the
Power-supply
block
at
the
primary
winding
of
Power
transformer
referring
to
the
“Line
Voltage
Selection”
described
in
Service
Manual.
@ This product is a system(s) component.
This
product
does
not
function
properly
when
independent;
to
avoid
malfunctions,
be
sure
to
connect
it
to
the
prescribed
system
component(s),
otherwise
damage
may
result.
CONTENTS
CHAPTER 1 CHAPTER 2
1.1
SAFETY
INFORMATION
--------2
1-2
2.1
PACKING
AND
EXPLODED
VIEWS
--
2-3
1.2
SPECIFICATIONS
v-11eeeeeeee
1-3
2.2
SCHEMATIC
AND
PCB
CONNECTION
1.3
PANEL
FACILITIES
nee
eee
taste
mane
ceeeneceoer
1
—-4
DIAGRAMS
OSES
eee
ee
cee
sence
cece
beeen
eease
2-10
1.4
DISASSEMBLY
wee
eww
ea
anes
neta
reece
ceseces
1
-7
2.3
BLOCK
DIAGRAM
eee
eee
nen
ee
meme
ne
eaee
2-50
1.5 IC INFORMATION biota stelle love Sua itiai ayers shanate sian 1-8
1.6 FL INFORMATION Beas e ede sea veet cenaeeues 1 —_ 10
1.7 ADJUSTMENTS Wale Gistiie Sind gelgike die vata 5.0 /5%G, alate" 1-11
1.8 PARTS LIST FOR PACKING AND
EXPLODED VIEWS a Ssh 8 Sale eae korean ole aca evele 1 — 1 9
1.9 PCB PARTS LIST piled iia Byala. ea fave olarlese java ted oA ene; des 1 -—23
PIONEER ELECTRONIC CORPORATION = 4-1, Meguro 1-Chome, Meguro-ku. Tokyo 153, Japan
PIONEER ELECTRONICS SERVICE INC. P.O. Box 1760. Long Beach. California 90801 U.S.A.
PIONEER ELECTRONICS OF CANADA, INC. 300 Allstate Parkway Markham, Ontario L3R OP2 Canada
PIONEER ELECTRONIC [EUROPE] N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER
ELECTRONICS
AUSTRALIA
PTY.
LTD.
178-184
Boundary
Road,
Braeside,
Victoria
3195,
Australia
TEL:
[03]
580-9911
YZ
24
©
PIONEER
ELECTRONIC
CORPORATION
1994
T—DFF
MAY
1994.
Printed
in
Japan

RX-P840
CHAPTER 1
1.1 SAFETY INFORMATION
This service manual is intended for qualified service technicians; it is not meant for the casual
do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been
trained
to
properly
and
safely
repair
complex
products
such
as
those
covered
by
this
manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may void
the warranty. If you are not qualified to perform the repair of this product properly and safely, you should
not
risk
trying
to
do
so
and
refer
the
repair
to
a
qualified
service
technician.
WARNING
Lead in solder used in this product is listed by the California Health and Welfare agency as a known reproductive toxicant which
may cause birth defects or other reproductive harm (California Health & Safety Code, Section 25249.5).
When servicing or handling circuit boards and other components which contain lead in solder, avoid unprotected skin contact with
the solder. Also, when soldering do not inhale any smoke or fumes produced.
NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols -f&—4 (fast operating fuse) and/or ~-§&— (slow operating fuse) on PCB indicate that replacement parts
must be of identical designation.
REMARQUE
(POUR MODELE CANADIEN SEULEMENT)
Les symboles de fusible -§——1 (fusible de type rapide) et/ou -§—# (fusible de type lent) sur CCi indiquent que les
piéces de remplacement doivent avoir la méme désignation.
(FOR USA MODEL ONLY)
1.SAFETY PRECAUTIONS
The following check should be performed for the
continued protection of the customer and service
technician.
LEAKAGE CURRENT CHECK
Measure leakage current to a known earth ground
(water pipe, conduit, etc.) by connecting a leakage
current tester such as Simpson Model 229-2 or
metal parts of the appliance (input/output terminals,
screwheads, metal overlays, control shaft, etc.). Plug
the AC line cord of the appliance directly into a 120V
AC 60Hz outlet and turn the AC power switch on. Any
current measured must not exceed 0.5mA.
Reading should
Leakage | 20t be above
current | 0.5mMA
tester
°
Test ail
exposed metal
surfaces
Also test with
plug reversed
(Using AC adapter
plug as required)
Earth
ground
AC Leakage. Test
equivalent between the earth ground and ail exposed |
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A PO-
TENTIAL SHOCK HAZARD AND MUST BE COR-
RECTED BEFORE RETURNING THE APPLIANCE TO
THE CUSTOMER.
2.PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the appli-
ance have special safety related characteristics. These
are often not evident from visual inspection nor the
protection afforded by them necessarily can be ob-
tained by using replacement components rated for vol-
tage, wattage, etc. Replacement parts which have
these special safety characteristics are identified in
this Service Manual.
Electrical components having such features are
identified by marking with a A on the schematics and
on the parts list in this Service Manual.
The use of a substitute replacement component which
dose not have the same safety characteristics as the
PIONEER recommended replacement one, shown in
the parts list in this Service Manual, may create shock,
fire, or other hazards.
Product Safety is continuously under review and
new instructions are issued from time to time. For
the latest information, always consult the current
PIONEER Service Manual. A subscription to, or éd-
ditional copies of, PIONEER Service Manual may be
obtained at a nominal charge from PIONEER.

1.2 SPECIFICATIONS
@ STEREO CASSETTE DECK RECEIVER: RX-P840
Amplifier Section
<U.S. model>
Continuous Average Power Output is 70 Watts* per
channel, min., at 8 ohms from 40 Hz to 20,000 Hz with
no more than 0.9 %** total harmonic distortion.
Continuous power output (RMS)
Sacto leita osetia 100 W+100 W (1 kHz, T.H.D. 10%, 8 Q)
Continuous power output (DIN)
Sisusd Wesstbecdshecsesutescccets 75 W+75 W (1 kHz, T.H.D. 1%, 8 Q)
Music power (DIN).........ccceesccscesetscseeeeeees 324 W (Total)
Peak music power output
(Muiti-voitage model only)...........ceeeseeeeeees 730 W/8 Q
FM Tuner Section
Reception frequencies... ee eeeeeeeeeeeee 87.5 — 108 MHz
AM Tuner Section
Reception frequencies ............... 531 kHz — 1602 kHz (9k)
530 kHz - 1700 kHz (10k)
ANTENNA ou. .cecesssscececesneeccecereecens Loop antenna (included)
Double Cassette Deck Section
SYSTEM tyPe ou... eeccseceesseereee 4-track, 2-channe! stereo
Heads 2rcc2 oi idedenedciecnee. Recording/playback head x 1
Playback head x 1
Erasing head x 1
MOTOR i ssehscenccsht stvnctesenuceseianstasesetnccnsed DC servo motor x 1
Type Il (High/CrO:2) tape
sig abivecn dest us dtevbantdarvsieuseudcaetccees *35 Hz - 15,000 Hz +6dB
(recorded at -20 dB)
Type | (Normal) tape............. *35 Hz - 14,000 Hz +6dB8
(recorded at -20 dB)
Frequency response
SNiratiocisiesceesisedpucseeeds dies aecsateeaienttes *56 dB
(peak recording level, audible compensation)
Dolby B type NR on ....10 dB compensation at 5 kHz
Dolby C type NR on ....19 dB compensation at 5 kHz
*Values measured in accordance with EIAJ standards.
RX-P840
m@ ELECTRICAL REQUIREMENTS, ETC.
Power requirements
U:S. Modelisic.elasa i eliescnnks AC 120 V, 60 Hz
U.K. model... ceeeesseseseeeeee AC 240 Volts~, 50/60 Hz
Muiti-voltage model
Stereo deck receiver section........ AC 110/120 — 127/
220/240 V (Switchable), 50/60 Hz
Power consumption
Stereo deck receiver section
US HMOd! ieoioccscucesites ach custis classes cuaesiecacscideowe 170 W
U.K. and Multi-voitage models..............:ceee 390 W
AC OUTLET ...... eee UNSWITCHED 100 W MAX x 1
External dimensions
Stereo deck receiver section
shots ssdusastdscudacccansssectece 260 (W) x 185 (H) x 365 (D) mm
10-1/4 (W) x 7-5/16 (H) x 14-3/8 (D) in.
Weight
Stereo deck receiver section...........7.3 kg (16 Ib 3 02)

RX-P840
1.3 PANEL FACILITIES
The illustration shows Multi-voltage model.
®
@ POWER STANDBY/ON switch/STANDBY
indicator
This is the switch for electric power.
ON: When set to the ON position, power is
supplied and the unit becomes oper-
ational.
STANDBY: When set to the STANDBY position,
the main power flow is cut and the unit
is no longer fully operational. A minute
flow of power feeds the unit to main-
tain operation readiness.
@ Remote control sensor (REMOTE SENSOR)
@® TAPE1/2 select button
@ DOLBY* NR select button (B/C/OFF)
*
* Dolby noise reduction manufactured under license from Dolby
Laboratories Licensing Corporation.
° “DOLBY” and the double-D symbol OO are trademarks of
Dolby Laboratories Licensing Corporation.
© TAPE | EJECT port (4)
© Display
@ TAPE Il EJECT port (4)
TAPE 1/2 operating buttons (<<, >>, &, <4, >)
@® Function select indicator
(TUNER, TAPE, CD, MD/AUX)
@ Sound Field Control (SFC MODE)button
@ ASES/COPY button
@ Record/pause button (etl)
@ Microphone jack (MIC) and microphone level
control (MIC LEVEL) (Multi-voltage model
only)
Clock adjust button (CLOCK-ADJ)
@® WAKE-UP button
@ Timer recording button (TIMER REC)
@ TUNING (+, -) button
8 BAND button
@ MEMORY button
@ AUTO TUNING button
@ Frequency/station button (FREQ./STATION)
@ FUNCTION select button (DEMO button)
Each time this button is pressed, the function changes
in the following sequence:
ia TUNER ——® TAPE —* CD
MD/AUX ao
@ P.BASS button
@ VOLUME control
@ Headphone jack (PHONES)

REMOTE CONTROL UNIT
RX-P840
@ For U.K. mode!
(5B, 5C)
Press and slide the upper lid surface
to open the remote control unit case.
Controls shown here without special instructions indi-
cate functions which are the same as those found on the
main deck-receiver unit.
@ Display window
Displays the current operation.
@ System function buttons
POWER
seisee Power switch (ON/STANDBY)
Scdtisteteuveee Function select button
ue
shades Main volume
seeseteabevets Sound field selector
selescevatace'ed Stereo wide pattern selector button
dadscsucsoots Bass boost mode button
@) TUNER operation buttons
TUNER
STATION
agaseae Use for calling radio stations stored
in the station memory. Broadcast stations must be
stored in the station memory before operating.
ANA
bascdtisdseins FM/AM selector
eistbesaisaeg, FM stereo/mono selector (operates
ok vied only during FM stereo reception)
Cc) - ...Station memory call buttons
@ TAPE |, TAPE Il operation buttons
Tape
Sesdhais Use to select Tape ! or Tape Il
a)... Fast forward, rewind button
C) ee Stop button
G) © Sona Play buttons
PRUE ee eeeceeeeeneee TAPE !! record/pause button:
This button does not operate when TAPE | is light-
ed in the remote control unit's display. Switch first
to TAPE Il.
© CD operation buttons
(5A) Buttons for ordinary operations
Track search button
Stop button
Pause button
Play button
Disc select button
..Send button (transmits the play
signal for selected disc title to the
main unit)
sisiestd Disc title button
{use to select disc title)
(5B) Buttons for selecting and searching for disc
titles
*Gee) .2G) _.Character buttons
iugssessadsaue Input button
ra
RD hadnt Cursor control buttons
ci TOM
<5 seaddlescuccasd Custom button
osc
reediacedeniass Disc button
netuon
cS ddedeeadessiies Return button
duspebusuataes Search button
{5C) Buttons for other convenient functions
iy fora
CC ~ C2 __Dise and track number setting (digit)
er buttons
(Ce ee ene Functions as “clear” button to cancel
CD program steps. Also used to erase al! discs select-
ed with the custom mode.
reack
dei dcbigeieads Track set button
S) cudainteds Disc set button
fete Program set button
érSSieeee cies Random play button
aD earnenee Repeat play button
seusseseeesee-CD play mode button
Sizcdeieaveas Time button

RX-P840
© TIMER operation buttons
WAKE UP
PE NF eeceeee Use to select wake-up 1 or wake-up
suser 2 timer functions.
Lbgosseabcatoees Sieep timer
snooze
Cc) Saesestecosvoye 5-minute snooze timer (restarts unit
5 minutes after wake-up timer oper-
ates; does not function during nor-
mal play).
@ RESET button
This is the remote control unit's system reset button.
If the remote control unit's display appears abnormal
during use or when exchanging batteries, and the
main unit no longer responds to commands, press
this button to reset the remote control unit.
Disc titles stored in the memory are preserved even
when the RESET button is pressed.
@ For U.S. and Multi-voltage models
The illustration shows Multi-voitage model.
@ System function buttons
POWER
SS iiw........... Power switch (ON/STANDBY)
FUNC
died Function select button
vooe
dansiaeetaets Sound field selector
P.B4Ss
shdeaseesdwalss Bass boost mode button
sr
wide
VOLUME
=a pebivesuenwie Main volume
KARA
KE
d cgedeeciacede Stereo wide pattern selector button
satuesenees One-touch karaoke button
(Multi-volttage mode! only)
@ TUNER operation buttons
s gouabeteuiue FM/AM selector
re FM stereo/mono selector (operates
113 s2ea only during FM stereo reception)
Cc) = ... Station memory call buttons
@ TAPE I, TAPE ll operation buttons
(=) seodiscoisosts Stop button
Gs) ee) tous Fast forward, rewind button
TAPE Il
setae Play buttons
Exbe%
sabusédanscent To operate TAPE |, press the desired
deck operation button while press-
ing this button. (Except for the
Record/pause (@#1) button)
ex) sidece Record/pause button
@ CD operation buttons
Buttons for ordinary operations
COE) saete Disc select button
i) ee) wise Track search button
oH) uodanberbeuste Pause button
co
@) bata Stop button
te) Cul saaieens Play button
Buttons for other convenient functions
143
1022
~ Co) ...Disc and track number setting (digit)
1123 buttons
Jeeicacrediee Functions as “clear” button to cancel
CD program steps. Also used to erase
all discs selected with the custom
ors mode.
way saevancees Disc set button
sseisiesaoce Track set button
eedaastoscae CD play mode button
ésieieseteiece Random play button
aabathesnaese Repeat play button
ex) saeeesteecl! Program set button
teed
eee ccrtidsetetian Time button
© TIMER operation buttons
waxe-uP
Mise detiesess Use to select wake-up 1 or wake-up
stcer 2 timer functions.
sevteecieeass Sleep timer
SNOOZE
eri saates 5-minute snooze timer (restarts unit
5 minutes after wake-up timer oper-
ates; does not function during nor-
mal play).

| RX-P840
1.4 DISASSEMBLY
i MAIN ASSY
1. Remove the bonnet case.
2. Remove the Rear Panel Section
@ Remove the screw @ (2 screws) of the antenna terminal.
@ Remove the screw @ (1 screw) of the pin jack (MD/AUX).
@® Remove the screw @) (1 screw) of the connector for CD.
@ Remove the screw @ (2 screws) of the front speaker terminal.
© Remove the screw © (1 screw) of the pin jack for surround speaker. (SD and HB types only)
© Remove the screw © (1 screw) between the chassis and rear panel.
3. Remove the Front Panel Section
@ Remove the screw @ (1 screw) holding the lead wire from the cassette mechanism unit and MIC assy.
Remove the VOLUME knob on the front panel, and remove the screw © (2 screws).
(©) Remove the screw © (1 screw) between the chassis and front panel bottom.
0 Remove the screw 40 (1 screw each side) between the chassis and front panel left/right-side.
) Remove the front panel from the chassis. (Be careful of the craw on the left and right sides).
4, Remove the screw @ (3 screws) holding the MAIN assy.
MAIN Assy Rear Panel
Front Panel Screw @
Screw ©
os)
a.
-7 oS) Screw @
Lead Wire Screw @
\
\
&
g g
@
we Screw @
\
Screw (1)
Chassis
Screw
Screw © VOL Assy
VOLUME Knob

RX-P840
1.5 IC INFORMATION
@ The information shown in the list is basic information and may not correspond exactly to that shown in the
schematic diagrams.
Wi PD4523A (IC 1901 : DISPLAY ASSY)
@ System Control CPU
@ Pin Assignment (Top View)
DECK CLK ww
DECK DATA aa
rT
DECK LE
POWER ON/OFF
SB CLK
SB OATA
RESET
@U2040 CLK °
BUz2040 DATA «gto:
9162, 9164 STB
SPECTR
1M.
ANALYZER 1
SPE
TRUM
ANALYZER 2
Gos Gos
Gos
TUNE/STEREO
SPECTRUM ANALYZER 4
SPECTRUM ANALYZER S
«
w
N
i
x
z
<
4
o
o
a
w
@ Pin Function
1
FIPO
2 | FIPS
8 Vop
9 | SCKO
10 | SOO
FIP6
Vop
DECK
CLK
DECK
DATA N_ | DECK DATA (M66320)
Go2 oor
por P02 Pos poe
vLoao
P05
a] al
°
&
s
o
F
mets
6G
N_ | DECK CLK (M66320)
11 | P25 {DECK LE} C | DECK LE (M66320)
POWER
12 | P24 ON/OFF POWER ON/OFF
13 | P23 | SBCLK System bus CLK
14 | P22 |SB pata| C |
8sse p
89380 shins
REESE iNTPO/PO0 ©
eisac
258s¢
aeaca
P31 ©
P33 ©
P32 ©
Pt1/KO04 Ps 0
1 2-K00S
PIE/KOOS
b14/K007
P15/KO08
P16
B17
KIO
Kit
Kt 2
KL 3 wes
PLL. 9162. 9364 CLK
162, 9164 DATA
PLL. 9462, o esse
$00/P26 ©
SCK0/®27 ©
PLL CE
GND
PULSE! P20 ©
PULSE? P21 0
FWO LEO
REV LEO P22. 0
REC LED P23 0
al Tate P24 ©
AN10/P10
ANI7/297
avoo ©
avss oO
AVREF ©
i}
a
oe]
°
°
INTPOsPO0
INTP3 P03
FL grid output
BACKUP +5V
System bus DATA
17
18
19
20
21
23
@ Block Diagram
Tobit TIMER?
[erat coor KS)
Beit TIMERS
EVENT COUNTER)
Boies TIMER,
Buzzer | CLOCK
ourpuT
°
P36 P35
RESET
BU2040
P74 CLK
BU2040
P73 | DaTA
AVss - — j Connected to Vss.
A/D | Spectrum analyzer input] (100Hz)
P17
P16
ANI5 =
ANI4
ANI3
ANI2
ANI
PROGRAM COUNTER
{
Rom
ROGRAM MEMORY
Po.
N
N
D
A/D | Spectrum analyzer input3 (1kH)
A/D | Spectrum analyzer input4 (3.3kHz)
D :
=)
CD
REQIENA C | System bus CD REQ/ENA
ffm | — [elmewe
RESET
PORTO Poo-PO4
U
poets P10~P17
GENERAL REG P20-P27
2
g
5
a
vecooe | | ~~ ~~ >
AND
CONTROL ports >eso-P37
Cyeon] ' ede
re a rorrel ees oes
\ * / oe Gade
posts] —erso-es er
crock {CLOCK GENERATOR cranny ay| | 1 oon ae ry
ourPUT Jorvioer CONTROL
CONTRO. 1 sup | warn
7
= cae eM e a
A/XTUXTZ XY KZ
1]
RESET VOO vss 1¢
Reset input
BU2040 CLK
BU2040 DATA
Spectrum analyzer input2 (330Hz)
A/D | Spectrum analyzer input5 (10kHz)

TUNE/
29 | | AVoo | AVobp
Connected to +5V.
eee Not used (Connected to GND.)
: p= [= se
spa
Connected to Oscillator (4.19MHz).
35 | X2
TUNER
Function LED TUNER
ots oo LED a Function ED @D
TAPE Function LED TAPE
LED
}s9 | Pas | MD LED
Function LED MD
STBY
LED
42 | P31 Function LED REV
43 | P30 FWD LED Function LED FWD
[son [1 [ea |
40 | P33 Function LED STAND BY
PLL + 9162
PLL * 9162 9164 CLK
* 9164 CLK
52 | Vop ee Connected to +5V.
53 | P127 KI3 I | Key input 3
oe Key input 2
TUNE/STEREDO status
discrimination input
RX-P840
Name
nos mm [1 feommn
a 9162 9164 STB
Segment output
e {al #
9
rae |
reo [Fupas|Pisixos| > |
arse»
2 fresno |
er | oc
ems | mon
fe |rm|_ = |e
P3 P
FL segment and
key scan output
FL segment
Segment output
rel ae]
fe ne [ae [|
re feme[oef
[ner [ee [|
I : Input
A/D : Analog Input
O : Cmos Output
N : Nch Open Drain Output
P : Pch Open Drain Output
i
E
4

RX-P840 |
1.6 FL INFORMATION
Mi AAV7006 (V1701
@ FL TUBE
@ Grid Assignment
000
O00
000 Ihe
000
000
SS oI] oa i
: DISPLAY ASSY)
88 CE
PCS
BBS
BS CSS
i
S7B16
=a JB15
== 1814
S813
= _]B1i2
00000
00 00
00 00
00000 00000 00000 000 00
00 00 00 00
00 00
—— a rs —— er)
000 00 00 00
00 00
3S
B2C=
BCs
S81
51818
seg
(126~S86)
(——— a — 2 |
aS Om] o=ns ii] es
— a —— ho — 2 — ———)
= Ss
=< =
126 116
@ Pin Assignment
@ Pin Connection
PIN NO.
@ Anode Connection
Sete: RASoaPeAR RARER i aaPA NoTe
comecTion FFs abi Zea ch pee ePeeh
(itz
{al
[| 126 | 118 | ves | 36 8G 66 | 5G
Perper ter te pe] | me] - [eo
p2 | 82 | B82 | B2 | B2 B2 n
BS BS
Bs | Bs | Bs | Be BE k k k k
a7 | BF B? | B7 B7
Bil
ei@ [fore > |e |e |
B11
|
(movies)
Sa
HS
Peepee
fee
[ea
ee]
we
[~~
|<
ates
[we
[ea
[ewe
fe
[==
PT
frie
[
oie
[aie
|
sie
aie]
ser
|
Pis | Bis | B15 | BIS | BIS me fe es
Pis| Bis | Bis | Bis | eis | ages | rie | - [cour] - | Ome
[P17 lwo ise te sak
1-10
=a
a
ee
$3
fe
nm
e
|
Ba 7 ZN CS a
pe fe te fe | > (OTmMER
k DIG
ST WIDE
&
7 BEAT
CUT
p
r
2D SLEEP
7
1G
id
le
lc
1b
la
$4
2d
ian _SS pe
BCS
a7 C=
a
BS LES
B4 C=
i
B20
eo —
C863
(76~36)
1) Fl,F2 —- F
SWANS 43 OS F2 —- ae:
3) DL ------ Datum Line
4) 16~12G ~— Grid