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

RX-P840
1.7 ADJUSTMENT
(1). TUNER SECTION
FM Tuner Section
@ Set the mode selector to FM BAND.
@ Connect the wiring as shown in Fig. 1-1.
FM
SG
(1kHz,
+75kHz
dev.)
Reception
Frequency
Display
Adjustment
Title
Adjustment
Location
Frequency
Level
Specifications
(MHz) (BzV)
98
1 Center Non 80 or more | 98MHz | 16207
Adjustment :
modulation
98 0-30 98MHz
maximum level, adjust T6101.
TUNED IND. Adjust so that the indicator of TUNED IND.
Notes:
© Before adjusting, make sure there is no gap between L6101 and L6102. If there is a gap between them, bring them into
contact with each other first, and then make adjustments.
@ Make indicator adjustments in order of AM — FM.
FM752 Antenna Terminal! 1C6201
Fig. 1-1 FM Adjustment Connection Diagram
Adjust so that the DC voltage between Pin 4
and Pin 28 of IC6201 becomes 0V+50mV.
After adjusting L6104 so that the DC voltage
of the Pin 12 of IC6201 (S-meter) becomes at
Front End
Sencitivity
@ AM Tuner Section
@ Set the mode selector to AM BAND.
e@ Connect the wiring as shown in Fig. 1—2.
AM SG (400Hz, 30% Mod.) R ti
Adjustment
eception
Title
Frequency
Level
pica
(kHz)
(dBuV_/m)
isplay
Adjustment
Location
Specifications
After adjusting VR6202 so that it is
TUNED IND. VR6202 illuminated when the ANT. input level is
Lighting Level within 45+3 dBeV/m, confirm that it is
extinguished at or below 40dByV/m.
Note : When SD type is used, set the AM frequency step to 10kHz.
AM Antenna Terminal
RX-P840
AM Loop Antenna
Fig. 1-2 AM (MW) Adjustment Connection Diagram
1-11

RX-P840
FM/AM TUNER MODULE
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(2).
POWER
AMP
MODULE
SECTION
(Refer
to
Fig.
2—
1.)
1. Handling Precautions
@ Since the heat sink and transistor metallic parts are
connected to the Front Amp output, make sure they do
2. Adjustment and Confirmation of Idle Current
@ Basically, the idle current needs to be confirmed when
replacing a power transistor, driver transistor, or bias
not contact the GND (chassis) or other circuits. transistor, or when the entire split board Assy of the
@ Since there is residual high voltage in the Power Amp Power Amp Module Assy has been replaced.
Module Assy +Bl (FRONT ASSY FOR 100W) even @ Make sure the heat sink has cooled sufficiently before
when
the
power
is
OFF,
caution
should
be
exercised.
(If
measuring
the
idle
current.
(Temperature
should
be
the
necessary,
the
voltage
should
be
discharged).
same
as
room
temperature;
25°C
is
ideal.
if
possible.)
@
When
handling
the
Power
Amp
Module
Assy,
make
sure
@
Idle
current
stipulated
value:
3—50mA.
you do not touch the fan motor blade.
Mi Front Amp Side (FRONT ASSY FOR 100W)
Insert a resistor (0.22Q, 3W or more) in series in the connector For measuring voltage at both sides of
CN7502 +Bi (or —B1) line (terminal No. 5 or 6). (Refer to Fig. 2—2.) | resistor
Lch side Short both sides of C7524. Do not operate Rch side.
Turn the power ON, wait 6 seconds, and then measure the resistance
voltage in Step 1. Lch Idle current I=V_/0.22 (Q)
@ Same as Step 1 above. :
@
Short
both
sides
of
C7523.
Do
not
operate
Lch
side.
Rch side
Turn the power ON under the above conditions, and after 6 seconds
measure the resistance voltage in Step 1.
If the measured idle current is greater than 50mA, perform the
following procedure.
Lch side Short between the Point @) pattern in Fig. 2—3 using solder. pl R7517 to R7515 in a parallel
Rch
side
Short
between
the
Point
®)
pattern
in
Fig.
2—3
using
solder.
ied
R7518
to
R7516
in
a
parallel
After performing Steps 7 and 8, remeasure the idle current and
confirm that it is below 50mA.
1-12

Measurement
RX-P840
Remarks
If the idle current is below 3mA, perform the following procedure.
Lek side Short between the point ‘© pattern in Fig.2~
3 using solder.
Reh side
7
| Short between the point ©) pattern in Fig.2~3 using solder.
| Connect R7551 to R7519 in a parallel
: circuit.
/ Connect R7552 to R7520 in a parallel
| circuit.
' After performing step ‘© and @), remeasure the idle current and
confirm that it is greater than 3mA (within 3~50mA).
O BOUNTY
poe
PWR, PRTEC ASSY
Fig. 2-1 POWER MOD. F100
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Beste 3 cases 8
CN7502 ._
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Resistor (0.220, SW or more}
Fig. 2-2 FRONT ASSY FOR 100W
o
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GE Ga
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Point ©)
Point (Db)
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FAN BODY
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Fig. 2-3 FRONT ASSY FOR TOOW
Lis

RX-P840
3. Adjusting the Operating Temperature Setting of the Fan Motor (VR7701)
This adjustment is necessary when 1C7403 (+12V
regulator), Q7301 and Q7302 (temperature sensors), or
VR7701 has been replaced, or when the entire split board
Assy of the Power Amp Module Assy has been replaced.
Wi Adjustment-Related Cautions
@ Make sure the heat sink has sufficiently cooled (is the
same as room temperature Ta.)
@ Once the power has been turned ON, make FAN
measurements and adjustments as quickly as possible. (If +12V
too much time is taken, the heat sink temperature will
rise, and the measurements will deviate from the Ta
measurement point.)
FRONT ASSY FOR 100W
START
R7712 [DLING
R7708
R7714
i Adjustment R77093
1. Connect a voltmeter between TEMP and TP (or between
1IC7702 terminals No.3 and 2). (Refer to Figs. 2—3 and
1¢7702
2-6.) R7710
2. Determine the fan motor operating temperature setting
by means of the following formula. (Tolerance is within R7711 =
+30mV.)
Formula: (85°C — Ta) x 19 (mV) VR7701 S—
Ta: ambient temperature (°C)
3.
Adjust
VR7701
so
that
the
voltage
between
TEMP
and
@
io?
TP
is
the
value
obtained
from
the
above
formula.
77
Digital voltmeter or tester
For example:
when the room temperature is 25°C,
set
value
=
(85
—
25)
x
19
(mV)
Fig.
2—6
Adjustment
of
Operating
Temperature
Setting
of
Fan
= 1140mV (tolerance within +30mV). Motor
Note:
Adjustment during service should be +30mV, but if this
value cannot be obtained with the measuring instruments
used for adjustment, +50mV is acceptable.
1-14

RX-P840
(3).
CASSETTE
DECK
SECTION
e Adjustment points and test points are shown in Fig. 3—2 and Fig. 3—4.
@@ Mechanical Adjustment
®@ Set the TAPE function.
®@ Test tape: STD—301 (3kHz, 30min).
1. Tape Speed Adjustment
No.|
Mode
Test
Tape
Adjusting
Measurement
Points
Points
STD-301
PLAY (Playback:
3kHz)
Adjustment Procedure 3
Press the PLAY SW and adjust so that the reading
becomes 3010Hz+10Hz. Confirm that wow &
flutter level is below 0.2% (in the reverse direction,
confirm that the reading is within 3010Hz=+ 60Hz).
TAPE TEST
POINT (Rch)
(MAIN Assy)
DECK Unit
VR4111
Electrical Adjustment
Playback Adjustment (Decks | and Il)
; .
1.
Head
Azimuth
Adjustment
j.
Confirm
that
the
tape
speed
adjustment
has
been
2.
Playback
Level
Adjustment
completed.
2. Clean the heads and demagnetize them using a head
Check the following before starting.
Recording Adjustment (Deck II)
eraser.
'
mee
‘
3.
Set
the
measurement
level
to
0
dBV
=
1
Vrms.
Bis
Oscillation
Reedurecy:
eCInSnen
4.
Use
th
ified
t
to
Sanlidatinent
Usethe
labaled
2.
Recording
Level
Adjustment.
ts
:
SSPE
CIES
Tape
108
Se
IUS
HERES
Ron
aaeae
3.
Recording
“
playback
Frequency
Characteristics
(A)
side
of
the
test
tape.
Adi
:
justment
STD
—331E:
For
playback
adjustment
4.
ALC
Operation
Check
STD—631:
Normal
blank
tape
5.
Provide
yourself
with
the
following
measuring
devides:
@
AC
millivoltmeter
@
Low-frequency
oscillator
*As
the
reference
recording
level
is
250nwb/m
for
@
Attenuator
STD—331E,
the
recording
level
will
be
higher
by
4
dB
for
@
Oscilloscope
STD-—331B
(160nwb/m).
When
adjusting,
pay
carefull
6.
Adjust
both
right
and
left
channels
unless
otherwise
attention
to
the
type
of
tape
used.
specified.
7.
Turn
the
DOLBY
NR
switch
off
unless
otherwize
specified.
8. Warm up the unit for several minutes before adjustment.
In particular, be sure to warm up the unit in the
REC/PLAY mode for 3 to 5 minutes before starting
recording/playback frequency characteristics
adjustment.
. Always follow the indicated adjustment order.
Otherwise, a complete adjustment may not be achieved.
wo
O¢dB 30s
OdB : 315Hz, 250nwb/m
30s 30s 30s
Fig. 3-1 STD—331E Test Tape
1-15

RX-P840
PLAY BACK
Dolby noise reduction manufactured under license from Dolby Labora-
tories Licensing Corporation .
“DOLBY” and the double-D symbo/ OO are trademarks of Dolby
Laboratories Licensing Corporation.
RECORDING
REV Azimuth Adjustment Screw Fig. 3-3 F Ch hock
FWD Azimuth Adjustment Screw 19. PSHUSHEY A DeractereHes
Fig. 3-2 Head Azimuth Adjustment
@ Playback Adjustment
@ This unit is equipped with auto tape selector.
1. Head Azimuth Adjustment @ Do not switch between forward and reverse operation with the screwdriver inserted.
Tape
Selector
(AUTO)
STD —331E Head azimuth | TAPE TEST Max After adjustment, apply
test tape adjustment POINT . lock paint to the head
1 | NORMAL | PLAY (Playback: 10kHz, screw (L, Rch) cee an azimuth adjustment
—20dB) (Fig. 3—2) (MAIN Assy) en screw.
2. Playback Level Adjustment ® Since this adjustment determines playback Dolby NR level, perform it carefully.
Input Signal,“
Test Tape
Measurement | Adjustment
Adjusting
Points
Points
Value
Remarks
Tape
Selector
(AUTO)
Input Signal“
Test Tape
Measurement | Adjustment
Adjusting Points Points Value
Remarks
STD—331E Deck | VR4201 (Leh) | pape pest
teat tape WR4202 (Rch) POINT
a eed
(Playback: 315Hz, (L, Rch)
VR4203 (Lch)
0dB) Deck I VR4204 (Rch) (MAIN Assy)
1~16

@ Recording Adjustment
1. Bias Oscillation Frequency Adjustment
Tape
Selector
(AUTO)
Input Signal“ Measurement {| Adjustment
Test Tape
Adjusting Points Remarks
Points Value
Load the STD —631 Oscillation When the power is turned
frequency to be] ON while the BAND button
fest tape and set the Between ® 105.0kHz is depressed, the frequency
recording mode. Deck I T4351 point in Fig. +2kH7 Gill decrense = 3 EES
3-4 and GND. a ; :
2. Recording Level Adjustment
Tape
Selector Input Signal “Test Tape Adjusting Points
(AUTO)
Measurement | Adjustment
Points Value Remarks
; TAPE TEST
Input a 315Hz signal to the ikipitingnal POINT
MD/AUX IN terminal and set the level (L, Reh)
input selector to MD. (MAIN Assy)
STD—631 test tape and Deck | igre Repeat recording, playback
and adjustment until
ee playback the 315Hz Deck | VR4301 (Leh) | (L, Rch) _| playback level of the 315Hz
ena VR4302 (Rch) | (MAIN Assy) | signal becomes —5.2dBV.
@ Since this adjustment affects recording bias, prevent
3. Recording “playback Frequency Characteristics Adjustment distortion from increasing due to underbias.
Tape
Selector Input Signal Test Tape Adjusting Points
(AUTO)
Measurement | Adjustment
Points Value Remarks
Input a 315Hz signal to the seas
MD/AUX IN terminal and set the Tnpar signal (L, Reh) —25.2 dBV
input selector to MD. Deck I P or '
level (MAIN Assy)
Load the STD--631 test tape and TAPE TEST | Repeat adjustment until
playback level of the 10kHz
record “ playback the 315Hz and POINT signal is within 00:5¢B
10kHz signals. (see the Note (L, Rch)
below) VR4351 (Lch) (MAIN Assy) from that of the 315Hz
VR4352 (Rch) signal.
Note: Set to the same level used for the 315Hz input signal at step 1.
4, ALC Operation Check
Tape
Selector Input Signal “Test Tape Adjusting Points
(AUTO)
Measurement Adjustment
Points Value
Input signal level
Input 2 315Hz signal to the [Tap signal evel TAPE TEST
MD/AUX IN terminal and set the | Set to a level +10dB
input selector to MD. above the input level at
step 1.
Remarks
POINT
(L, Rch)
(MAIN Assy)
—2.2+2.5dBV
1-17

RX-P840
Left Side Right Side
VR4111
<7} VR4301
VR4302
VR4204
VR4203 VR4352
VR4202 =) VR4351
VR4201
DECK Unit
DECK Unit
VR4352
|
VR4351
MAIN Assy
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Fig. 3—4 Adjusting Points and Measurement Points
1-18

RX-P840
1.8 PARTS LIST FOR PACKING AND EXPLODED VIEWS
NOTES :
@ Parts marked by “NSP” are generally unavailable because they are not in our Master Spare Parts List.
@ The A mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing,
be sure to use parts of identical designation.
@ Parts marked by “®” are not always kept in stock. Their delivery time may be longer than usual or they may be unavailable.
(1). PACKING
Hi CONTRAST OF SD, HB, KU AND KC TYPES
RX —P840/SD, HB, KU and KC have the same construction except for the following :
Description
Operating instruction ARC7018 Not used Not used
(Spanish/Chinese)
Operating instruction Not used Not used Not used ARC7021
(English/French)
Operating instruction ARB7012 ARB7012 ARB7012 Not used
(English)
Remote control unit AXD7015 Not used Not used Not used
(CU—RX023)
Remote control unit Not used AXD7020* Not used Not used
(CU —RX025)
Remote control unit Not used Not used AXD7016 AXD7016
(CU —RX026)
Battery cover AZA7034 Not used AZA7034 AZA7034
FM antenna ADH1016 ADH1019 ADH1016 ADH1016
Packing case AHD7059 AHD7060 AHD7056 AHD7056
* : Refer to “(5). REMOTE CONTROL UNIT (CU-RX025)”.
i PARTS LIST FOR SD TYPE
Mark No. Description Parts No.
1 OPERATING INSTRUCTIONS ARC7018
(Spanish/Chinese)
2 OPERATING INSTRUCTIONS ARB7012
(English)
3 REMOTE CONTROL UNIT AXD7015
(CU—RX023)
4 BATTERY COVER AZA7034
NSP 5 BATTERY (R6P, AA) AEX—010
6 CORD WITH PLUG ADE7001
7 FM ANTENNA ADH1016
8 LOOP ANTENNA (L8043) ATB1012
9 FRONT PAD AHA7027
10 REAR PAD LR AHA7028
11 PACKING CASE AHD7059
12 SHEET AHG7003
NSP 13 LITERATURE BAG AHG~117
1-19

(2). EXTERIOR
Wi CONTRAST OF SD, HB, KU AND KC TYPES
RX —P840/SD, HB, KU and KC have the same construction except for the following :
Front panel AMB7089 AMB7088 AMB7088
FM/AM TUNER MODULE AXQ1012 AXQ1013 AXQ1012 "AXQ1012
CASSETTE MECHA MOD. BC EXK2420 EXK2420 EXK2440 EXK2420
T8005 Power transformer ATS7027 Not used Not used -. Not used
(AC110V/120 —127V/220V240V)
T8005 Power transformer Not used ATS7026 Not used Not used
(AC230V/240V)
T5005 Power transformer (AC120V) Not used Not used ATS7025 ATS7025
$8001 Voltage selector AKX—507 Not used Not used Not used
(AC110V/120— 127V/220V240V)
FU2 Fuse (T2A/250V) AEK~511 Not used Not used Not used
FU2 Fuse (T2.5A/250V) Not used AEK—512 Not used Not used
FU2 Fuse (5A/125V) Not used Not used AEK-—308 AEK — 308
FU3 Fuse (T2A/250V) AEK—511 Not used Not used Not used
AC power cord ADG1051 ADG1144 *2 ADG1146 ADG1146
Fuse (T5A/250V) Not used REK1029 *? Not used Not used For AC power cord
Strain relief AEC— 882 AEC —882 AEP—113 AEP-113
Rear panel ANC7104 ANC7102 ANC7099 ANC7100
Button AAB7023 Not used Not used Not used
A
A
A
A
A
A
A
A
A
A
MAIN assy AWZ7233 AWZ7231 AWZ7230 AWZ7230
VOL assy AWZ7236 AWZ7234 AW2Z7327 AWZ7327
PRIMARY assy AWZ7240 AWZ7239 AWZ7238 AWZ7238
DISPLAY assy AWZ7245 AWZ7244 AW27243 AWZ7243
MIC assy AWZ7267 Not used Not used Not used
* 1 : Conceming the differences between EXK2420 and EXK2440, refer to “(4). CASSETTE MECHA MOD. BC”.
*2 : Refer to “(2). EXTERIOR” in CHAPTER 2.
i PARTS LIST FOR SD TYPE
Mark No. Description Parts No. Mark No. Description Parts No.
1 DOOR-L AAN7033 A 11 AC POWER CORD ADG1051
2 DOOR-R AAN7034 12 STRAIN RELIEF AEC —882
3 FRONT PANEL AMB7089 A 13 FLEXIBLE CABLE (J1) ADD1098
4 FM/AM TUNER MODULE AXQ1012 NSP 14 CHASSIS ANA7009
5 POWER MOD. F100 AXQ1017 15 REAR PANEL ANC7104
6 CASSETTE MECHA MOD. BC EXK2420 16 FOOT ASS’Y PXA1201
A 7 POWER TRANSFORMER ATS7027 17. BRACKET ANG7002
(T8005) 18 DOOR SPRING (L) ABH7006
A 8 VOLTAGE SELECTOR ($8001) AKX—507 19 DOOR SPRING (R) ABH7007
A 9 FUSE (T2A/250V, FU2) AEK—511 20 KEEP PLATE ABK7002
A 10 FUSE (T2A/250V, FU3) AEK-—511
1—20