Marantz 2600 User manual

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MARANTZ DESIGN AND SERVICE
Using superior design and selected high grade components, MARANTZ Company has created the ultimate in stereo sound.
Only original MARANTZ parts can insure that your MARANTZ product will continue to perform to the specifications for
which it is famous.
Parts for your MARANTZ stereo are generally available within 72 hours throughout the nation via a toll-free fine to our
National Parts Depot in California. The sales professionals who take your call immediately refer to their own desk top com:
puter terminal and can quickly determine the availability and price information you require. If, for some reason, your order
should exceed our available stock, we usually can instantly provide an alternate replacement part or current delivery infor-
mation. When the order is placed and confirmed, the computer simultaneously generates ‘hard copy” orders at the distribution
center. As hard copies come directly from the computer to the national parts depot, your requested stock is assembled and
prepared for shipment and placed on the first available carrier for delivery to you.
ORDERING PARTS
Phone orders will eliminate mail delays, and we encourage the use of this method. If you order by mail, use MARANTZ parts
order forms which are available from our National Parts Depot Jocated at the following address:
SUPERSCOPE NATIONAL PARTS DEPARTMENT
20525 Nordhoff Street
Chatsworth, California 91311
Phone: [phone]
1-213-998-9333
The following information must be supplied to eliminate delays in processing your order:
Complete address.
Complete part numbers.
Complete description of parts.
Model number for which part is required (indicate MARANTZ).
Account number (for account customers only).
gw a
Direct consumers will be provided with the current retail price quotation on available parts in order to advise them of the cost
of the parts and shipping.
OVERSEAS PARTS ORDERING
Parts may also be ordered from the following overseas addresses:
CANADA AUSTRALIA JAPAN
Superscope Canada, Ltd. Superscope (Australasia) Pty., Ltd. Marantz Japan, Inc.
3710 Nashua Drive ; 32 Cross Street (P.O. Box 604) 3622 Kamitsuruma
Mississauga Brookvale 2100 N.S.W. Sagamihara Shi
Ontario, Canada L4V1M5 Australia Kanagawa, Japan
EUROPE
Superscope Europe, S.A. Marantz France Marantz Audio U.K. Ltd. Superscope GmbH
Avenue Leopold III, 2 Rue Louis Armand 9 London Road, 203 Max-Planck-Strasse 22
7120 Peronnes-Lez-Binche 92600 Asnieres Staines D-6072 Dreieich 1
Belgium Hauts-de-Seine Middlesex West Germany
France England
All of the above locations are fully equipped to take care of your total service needs. Because various countries have differing
configuration requirements, it is necessary that you contact the service facility in your particular country. in the event that
there is no service location listed for your country, please contact the nearest facility for the necessary assistance.
nRRaen Been eel z..
We sound better

TABLE OF CONTENTS
Section Title Page
Tec PWEBOAR DS +: 403 cere. dn Geek FP gene 41ehs Glew wis. deh ob & ON OES ee Se ea ed ph Re ee 4
2. TEST EQUIPMENT FOR SERVICING... 2.0... ee eee ree een ee beeen nee 5
3. AMALIGNMENT PROCEDURES .......... 0.0... ccc cece een cence eee een ene teen en eeee 5
S21) AM AF Alignments «6 63 cies he deh coeds oe. wat when tteronns lode ace Stet dk Shani et OMe te, Rakha ee bie weed 5
3.2 AM Frequency Range and Tracking Alignment... . 2... 0.0.0 0c ce ee eee ee ee eee ene eee eee 5
3.3 AM Signal Strength Display Adjustment ...... 0.0.0.0 0... cee eee ee eee eee eee eee eee e een ees 5
4. FM ALIGNMENT PROCEDURES ........... 0... ccc cee ccc eee ence eee eee ee eee nee ene e enn 5
4.1 IF Frequency Range and Tracking Alignment ... 2.2.0.2... ccc ce ee tee ee eee eee eee nee 5
4.2 Stereo Separation Alignment ..... 2.0... 0.0. ee ee ce ee ee ee eee ee nen e eee ease eens . 6
4.3 Muting Circuit Alignment... 0... ec ee ee ee eee eee eevee een tebe nba eeneus . 6
4.4 Dolby FM Tape QutputSetting 2.0... ee ee ee ne eee en eee nee ene eee nes . 6
5. AUDIO ADJUSTMENT 2050598 ed Sain ehh ald etiove wis ake ow dhe we eae ea dp see alah sale ek bali owes . 6
6. SCOPE DISPLAY ADJUSTMENT... 1.0.0... . ec ee ee ee eee nee eee e eee eben eens _7
6.1 AM Tuning Display Adjustment ...................0006 adaliaets ce We teht (pi ray Ota alg ohies ant ne tee le 4 She anes Ouehe: bra ores . 7
6.2 FM Tuning Display Adjustment .......0..0. 00. cece eee ec eee ee eee eee eee ene n nnn aenas od
6.3 FM Multipath Display Adjustment... 0.0.0.0... 00... cece ee ee ee eee eee een eee eee nen eens _7
7. VOLTAGE CONVERSION FOR EUROPEAN MODEL ........ 0... 0.0 ccc ccc eee eee eee eee eens ae |
8. DIAGRAMS ........... 0. cece eee eee essed octet ta ae ah haa BCetGns fopton Sula ton Selaawer eta mended ¢ Slave a aloha . 9
8.1) Block: Diagram. so 0:0) 2 Raho cae e Wie Bale aes, acho EG, wo Suetee See SHS sarees bf iotavtns b bled ow Male wel elated . 9
8.2 FM Front End Board Schematic Diagram and Component Locations-P100.......... 0.0.00 eee eee uence eeas . 10
8.3 AM Tuner/FM IF/MPX Stereo Decoder Board Schematic Diagram and Component Locations-P200 ...............05. 11
8.4 FM Noise Amp Board Schematic Diagram and Component Locations-PBOO0 ............ 0.00 eee ee eee eens . 14
8.5 FM Buffer Amp Board Schematic Diagram and Component Locations-PCO1............ 000 cee eee eee ees .14
8.6 Phono Amp/Selector Switch Board Schematic Diagram and Component Locations-P400..............-.0-ee008- . 15
8.7 Power Supply Board Schematic Diagram and Component Locations - P800-U.S.A.& Canada... 2.20... ee ee ee . 16
8.8 Power Supply Board Schematic Diagram and Component Locations -P800-Europe.............00 eee eee eens .17
8.9 Main Amp Board Schematie Diagram and Component Locations-P700 .. 2... 0.00.00. cee ee ee ee ee ees . 18
8.10 Pre/Tone Amp Board Schematic Diagram and Component Locations-PEQ1..........-... 000 cee eee eee ees . 20
8.11 Dolby NR Socket Board Schematic Diagram and Component Locations - PKO1- U.S.A. & Canada. ...........-..205 . 22
8.12 Audio Muting Board Schematic Diagram and Component Locations-PNO1..............0.e000e Spee e Yavianiee anaes . 22
8.13 Buffer Amp for Scope Input Board Schematic Diagram and Component Locations-PD01 ...............-e.e0008: - 22
8.14 Tape Copy/Tape Monitor/Scope Display Switches Board Schematic Diagram and Component Locations-PSO1 ........... - 23
8.15 Dubbing In/Out Jacks Board Schematic Diagram and Component Locations-PU01 .........-.-...0c0eeeeaeees - 23
8.16 Filter Amp Board Schematic Diagram and Component Locations-PTO1..............-0 cece cee eee neueeens - 24
8.17 Speaker System Switches / Attenuator Board Schematic Diagram and Component Locations-PWO1 ................ - 25
8.18 Function Indicator Board Schematic Diagram and Component Locations-PYO01 ..............0000e cee eeeeeey - 25
8.19 Dial Lamp Board Schematic Diagram and Component Locations-PZ01 ... 2.0.0.0... 0... c ce eee eee cece ewes - 25
8.20 Buffer Amp Board Schematic Diagram and Component Locations-PR50 .. 2... 0.00... 00. cee eee ee ey - 26
8.21 Scope Amp Board Schematic Diagram and Component Locations-P900............ 0.0000 cee eee ee eee ees - 26
8.22 Power Transistor Connection Board Schematic Diagram and Component Locations-PM01...........-.-...2-00000, ~ 26
8.23 Peak Indicator/Soft Start Board Schematic Diagram and Component Locations-PX01 ............ 0.000 eee eee . 27
8.24 Quartz Lock Board Schematic Diagram and Component Locations-PC50 ...........0.-00 2 cee eee ee eee eee, - 28
8.25 Touch Senser Board Schematic Diagram and Component Locations-PK51 .......... 0... e eee cece eee neces, - 28
§. EXPLODED VIEWS AND PARTS LIST... . 2.0.0... 0c ccc cece ee ee eee eee eee tenn nee n nee, - 29
9.4: (C01-99]: Front: Panels: o-oo ecaresd te hace «bee teeorg te wey Sta wee See a wh pes ng obs SS Esa Sees eked Sha an eles ha _ 29
9:2:-(C02-99) Lid: (Wop: Cover) «25.53 eave cSeas wd naa pees Aah My See aval gy Sen Wuaa temeae elon euoth vee wee eee _ 30
9.3 [CO3-99] Rear Panel... 2... Lc ee eee cence eee te nee eben teenies - 3i
9.4 [P01-99] Front Chassis and General Parts 22... 2.0... cee ee eee eee enna tees Biles ten seit ot ea . 33
9.5 [P02-99] Assembled P.W. Boards and Other Parts... 2.2... 0. cee eee eee cece eee eee eens, _ 34
9.6 [P03-99] Power Transistor and Heatsink 2.0... ce cee eee eee eee n eet nnnes, _ 35

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MODEL 2600 AM/FM STEREOPHONIC RECEIVER
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INTRODUCTION
This service manual was prepared for use by Authorized
Warranty Stations and contains service information for
Marantz Mode! 2600 Stereophonic Receiver.
Servicing information and voltage data included in this
manual are intended for use by the knowledgeable and
experienced technician only. All instructions should be read
carefully. No attempt should be made to proceed without
a good understanding of the operation of the receiver,
The parts list furnishes information by which replacement
Parts may be ordered from the Marantz Company. A simple
description is included for parts which can usually be ob-
tained through local suppliers.
1. P.W. BOARDS
As can be seen from the circuit diagram the chassis of
Model 2600 consists of the following units. Each unit
mounted on a printed circuit board is described within
the square enclosed by a bold dotted line on the circuit
diagram.
1. FMFrontEnd ...... mounted on P.W. Board P100
2. AM Tuner, FM IF &
MPX Stereo Decoder .. mounted on P.W. Board P200
OP w
=
=D0NRND
12.
13.
14,
15,
16.
17.
18.
19.
20.
21.
22.
23.
. FMNoise Amp...... mounted on P.W., Board PB0O
FM Buffer Amp ..... mounted on P.W. Board PCO1
. Phono Amp & Selector
Switch .........., mounted on P.W. Board P400
. MainAmp,........ mounted on P.W. Board P700
. Power Supply ...... mounted on P.W. Board P800
. Pre& Tone Amp .... mounted on P.W. Board PEO1
. Dolby NR Socket .... mounted on P.W. Board PKO1
Audio Muting ...... mounted on P.W. Board PNO1
Buffer Amp for Scope
Input ............ mounted on P.W. Board PDO1
Tape Copy, Tape Monitor & Scope
Display Switches .... mounted on P.W. Board PSO1
Filter Amp ........ mounted on P.W. Board PT01
Dubbing In & Out
Jacks ..........0. mounted on P.W, Board PUO1
Speaker System Switches &
Attenuator ........ mounted on P.W. Board PW01
Function
Indicator
..
mounted
on
P.W.
Board
PYO1
DialLamp......... mounted on P.W. Board PZ01
Buffer Amp........ mounted on P.W. Board PR50
Scope Amp ........ mounted on P.W. Board P900
Peak Indicator &
Soft Start ........., mounted on P.W. Board PX01
Power Transistor
Connection ........ mounted on P.W. Board PMO1
Quartz Lock ....... mounted on P.W. Board PC50
Touch Senser ...... mounted on P.W. Board PK51

2. TEST EQUIPMENT REQUIRED FOR SERVICING
This table lists the test equipment required for servicing the Model 2600 Receiver.
Item
AM Signal Generator
Manufacturer and Mode! No.
Use
Signal source for AM alignment
Test Loop
Use with AM Signal Generator
FM Signal Generator
MPX Signal Generator
Sound Technology
Model 1000A
Signal source for FM alignment
Stereo separation alignment and trouble
shooting
Distortion Analyzer
Audio Oscillator
AC VTVM
Sound Technology
Mode! 1700A
Distortion measurements
Sinewave and squarewave signal source
Voltage measurements (AC)
Oscilloscope
Tektronix Model T932
Philips Model 3232
Waveform analysis and trouble shooting and
ASO alignment
Frequency Counter
Fluke Model 1900A
Circuit Tester
DC VTVM
MPX Oscillator adjustment (VCO)
Trouble shooting
Fluke Model 8000 ‘’Digital’’ Simpson
Model 313, Triplet Model 801
———
Voltage measurements (DC)
AC Wattmeter
Simpson Model 1379
Monitors primary power to amplifier
AC Ammeter
Commercial Grade (1-30A)
Monitors amplifier output under short circuit
condition
Line Voltmeter
Variable Autotransformer
Simpson Model 1359
Superior Electronic Co.,
Powerstat Model 116B—10A
Monitors potential of primary power to
amplifier
Adjusts level of primary power to amplifier
Shorting Plug
Use phono plug with 600-ohm
across center pin and shell
aren coe
Shorts amplifier input to eliminate noise
pickup
——_—|__
Output
Load
(8
ohms,
Commercial
Grade
+0.5%, 500 W)
Tt . ar une
Provides 8-ohm load for amplifier output
termination
3.
Output Load (4 ohms,
+0.5%, 600 W) Commercial Grade
AM ALIGNMENT PROCEDURES
3.1 AM IF ALIGNMENT
1.
2.
Connect a sweep generator to the J229 and an align-
ment scope to the test point B.
Rotate each core of IF transformers L153 and L154 for
maximum height and flat top symmetrical response.
3.2 AM FREQUENCY RANGE AND TRACKING ALIGNMENT
1.
Set AM signal generator to 515 kHz. Turn the tuning
capacitor fully closed (place the tuning pointer at the
low end) and adjust the oscillator coil L152 for maxi-
mum audio output.
. Set the signal generator to 1650 kHz. Place the tuning
Pointer in the high frequency end and adjust the oscilla-
tor trimmer on the oscillator tuning capacitor for maxi-
mum audio output.
Repeat steps 1 and 2 until no further adjustment is
necessary.
. Set the generator to 600 kHz and tune the receiver to
the same frequency and adjust a slug core of AM ferrite-
rod antenna LOO2 and RF coil £151 for maximum
output.
Provides 4-ohm load for amplifier output
termination
5. Set the generator to 1400 kHz and tune the receiver to
the same frequency and adjust both trimming capacitors
of antenna and RF tuned circuit for maximum output.
6. Repeat steps 4 and 5 until no further adjustment is nec-
essary.
NOTE: During tracking alignment reduce the signal gen-
erator output as necessary to avoid AGC action.
3.3 AM SIGNAL STRENGTH DISPLAY ADJUSTMENT
Set an AM signal generator to 1000 kHz at 100 dB/m, and
adjust R163 so that the spot may meet upper mark.
4. FM ALIGNMENT PROCEDURES
4.1 FM FREQUENCY RANGE AND TRACKING ALIGNMENT
1. Connect an FM signal generator to the FM ANTENNA
terminals and an oscilloscope and an audio distortion
analyzer to the TAPE MONITOR OUT jacks on the rear
panel.
2. Set the signal generator to 87.4 MHz and provide about
3 to 5yuV. Place the tuning pointer at the low frequency
end by rotating the tuning knob and adjust the core of

oscillator coil L106 to obtain maximum audio output.
. Set the signal generator to 109 MHz and provide about
3 to 5yuV output. Rotate the tuning knob and place the
tuning pointer at the high frequency end and adjust the
trimming capacitor C123 for maximum output.
. Repeat steps 2 and 3 until no further adjustment is
necessary.
. Set the signal generator to 90 MHz and tune the receiver
to the same frequency. Decrease signal generator output
until the audio output level decreases with the decreas-
ing generator output. Adjust the antenna coil L101, RF
coils L102, L103 and L104 and IF transformer L105 for
minimum audio distortion.
. Set the signal generator to 106 MHz and tune the receiv-
er to the same frequency. Adjust the trimming capacitors
CFO1, CFO2, CFO3 and CF04 for minimum distortion.
. Repeat steps 5 and 6 until no further adjustment is
necessary.
. Connect a VTVM (at DC 1 V range) across the J204 and
J205, Adjust the secondary core (upper) of discrimina-
tor transformer £201 so that the VTVM indicates null
reading (zero reading) at no signal. Set the FM signal
generator to 98 MHz and increase its output level 1 kuV
and tune the receiver to the same frequency so that the
VTVM gives null reading. Adjust the primary core
(lower) of L201 for minimum distortion. (Scope.display
can, of course, be used as tuning indicator instead of the
VTVM, if the scope unit has been correctly adjusted as
instructed in the “Scope Display Adjustment’’.)
. Set the signal generator to 98 MHz at 100 kuV, and
adjust R278 so that the signal strength indicator spot
just reaches upper mark.
4.2 STEREO SEPARATION ALIGNMENT
1.
Set the FM signal generator to provide.1 kuV at 98 MHz.
Tune the receiver to the same frequency so that the
center tuning indicator spot indicates its center.
. Turn the signal generator modulation off (with the pilot
signal turned off), connect a frequency counter to test
point J238, and adjust R310 so that the frequency
counter may precisely read 19 kHz.
. Modulate the signal generator with stereo composite
signal consisting only of subchannel signal (of course a
pilot signal must be included).
. Adjust the trimming resistor R319 for maximum and
same separation in both channels.
4.3 MUTING CIRCUIT ALIGNMENT
1.
2.
Set the FM signal generator to provide 6 uV at 98 MHz
and tune the receiver to the same frequency correctly.
Depress the FM MUTING pushswitch, Set ROO1 to MIN
Position (counterclockwise). Adjust R330 until the mut-
ing circuit is activated to produce output for exactly
6 LV input.
. In turn increase the FM signal generator output up to
50 UV.
. Set ROO1 to MAX position (clockwise). Adjust R347
until the muting circuit is activated to produce output
for exactly 50 uV input.
. Turn ROO1 from MIN to MAX to assure the muting
threshold level can change in the range of 6 to 50 uV.
6.
Adjust ROO1 until the muting threshold level is 12.5 V.
Then, increase the FM signal generator output up to
1 kuV and shift its frequency up and down. Note both
up- and down-shifted frequencies at which undesirable
audio side responses are muted out. Adjust R280 until
the muting circuit is activated when the oscilloscope
trace deflects 10 to 20 mm.
. Turn on QUARTZ Lock pushswitch and observe the
QUARTZ LED which synchronize with the muting
circuit.
4.4 DOLBY FM TAPE OUTPUT SETTING
1.
2.
Set the modulation of FM signal generator to 400 Hz,
50% (+37.5 kHz Dev.).
Set the signal generator to provide 1 kuV at 98 MHz.
Tune the receiver to the same frequency so that the
center tuning meter pointer indicates its center.
. Set the SELECTOR switch to the FM 25uS position.
Set the trimming resistors RCO1 and RCO2 so that the
output of the TAPE MONITOR OUT jacks R and L
become 580 mV at VTVM.
. AUDIO ADJUSTMENT
. Voltage adjustment
Connect a DC voltmeter across the pins 4 and 3 on J805.
Adjust the trimming resistor R819 until the DC volt-
meter reads 32 V.
. Main Amplifier DC off-set alignment
Connect a DC voltmeter with 0.5 or 1 V range between
the speaker terminals and adjust the trimming resistor
R760 for “zero”’ DC output on the meter. Repeat the
same procedure for the other channel.
NOTE: During this alignment no load should be connected
to the speaker terminals.
. Idle current adjustment
Connect a DC voltmeter (in 50 mV range) across TP1
and TP2 on JX01. Adjust R761 on the P.W. board on
the left side of the tunnel heatsink until the veltnneter
reads 25mV (32 mA). In turn, connect the vetnreter
across TP3 and TP4 on JX02 and similarly, adjut FR716
on the P.W. board on the right side of the tunrel heat-
sink until the voltmeter reads 25 mV (32 mA).
. Check DC off-set voltage aligned in the procedue 3 and
if any DC output is observed on the DC voltmete, acijust
the R760 again for ‘‘zero’’ output.
CAUTION: CONTINUOUS POWER OUTPUT TESTS-
Continuous sine wave tests at high audio powe levels
impose a maximum loading condition for the powersup ply,
particularly when testing with 4 ohm output loads,ancd far
exceeds power supply loading encountered with grogram
materials. A primary line fuse has been selected for the
Model 2600 which will open if the following 4 ohmtesting
periods are exceeded:
A. At rated power of 400 watts per channel.
Testing period- 20 minutes max.
B. At power levels above 400 watts per channel.
Individual tests- 1 minute max.

6. SCOPE DISPLAY ADJUSTMENT
=
. Set the SELECTOR switch to the AUX position.
2. Set the SCOPE LEVEL and VOLUME controls to the
10.
11.
FCCW position.
Depress the SCOPE DISPLAY ON and AUDIO push-
switches in.
Adjust the CENTERING controls until the spot comes
in the center of the small circle.
Adjust the BRIGHT control (ROO2) on the rear panel
until the brightness becomes dark a little.
Adjust the FOCUS control so that the spot may be-
come smaller and circular.
. Turn the SCOPE LEVEL control to the FCW.
. Connect a 150 mV, 1 kHz signal to the AUX INPUTS
R jack and adjust R928 (H. GAIN) until the horizontal
deflection is around 3 cm.
In turn, connect the same signal to the L jack and
similarly, adjust R927 (V. GAIN) until the vertical
deflection is around 3 cm.
Set the CENTERING control to the 12-0’clock posi-
tion and adjust R925 (H. CENTER) until the spot
comes in the horizontal deflection center.
Similarly, adjust R926 (V. CENTER) until the spot
comes in the vertica! deflection center.
For 110V Operation For 120V Operation
6.1 AM TUNING DISPLAY ADJUSTMENT
1. Depress the SCOPE DISPLAY ON and TUNING push-
switches. Set the SELECTOR switch to the AM position.
2. Adjust R931 until the spot comes in the center below
the base line without tuning into a station.
6.2 FM TUNING DISPLAY ADJUSTMENT
1. Depress the scope DISPLAY ON and TUNING push-
switches. Set the SELECTOR switch to the FM position.
2. Connect FM signal input of 100 kuV (98 MHz, 400 Hz,
30% mod.) to the FM ANTENNA terminals and adjust
R278 so that the spot does not frame out.
6.3 FM MULTIPATH DISPLAY ADJUSTMENT
1. Adjust R280 to obtain full deflection of the trace within
both side marks, applying FM signal (1 kuV, 400 Hz,
100% mod.) to the FM ANTENNA terminals.
7. VOLTAGE CONVERSION FOR EUROPEAN MODEL
The European version of the Model 2600 is equipped with
a universal power transformer that may be adjusted to
operate at 110 V, 120 V, 220 V, or 240 V AC at 50 to
60 Hz. To convert the unit to a different power source
voltage, reposition conversion plug at shown in Figure 1.
CAUTION: DISCONNECT POWER SUPPLY CORD
FROM AC OUTLET BEFORE CONVERT-
ING VOLTAGE.
For 220V Operation
For 240V Operation
Figure 1. Voltage Conversion Chart

POINTER
FLYWHEEL
Figure 2. Dial Stringing
FTZ REGULATION
Instruction for the use in the range other than specified in FTZ codes.
Achtung fiir die Leute, die in dem Gebiet wohnen, wo die FTZ-Bestimmungen vorherrschend sind.
Sollte das Gerat auch fiir Frequenzen auszerhalb des in den FTZ-Bestimmungen angegebenen Bereiches empfangeberet sein,
bitten wir, den Bereich durch Nachstellen des Kernes in der Oszillatorspule (in der Abbildung mit ‘““F TZ’ gekennzeictnet.) so
zu korrigieren, dass er den Bestimmungen entspricht,

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(0024)
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H H dv B335N9 WA (L094)
peer |
VNNIINY GO83118H 34
QONX ONINML 4901
DIAGRAMS
§.1 BLOCK DIAGRAM