Marantz 1200 Service Addendum

Page 1

This manual is applicable to units bearing serial
numbers above 3500 and is the same as the
manual for units below that serial number except
for the following:

Throughout the original manual, replace "A", B",
"Channel A and "Channel B with ",L "R",
L Channel" and "R Channel", respectively.

Column 2, 3rd paragraph - Replace
last sentence with: This switch
applies L, R, STEREO, STEREO RE-
VERSE, or L+R signals to the BAL-
ANCE CONTROL through the GAIN
SWITCH which selects HIGH or LOW
overall preamplifier gain.

Page1-

Column 1, 2nd paragraph - Replace
entire paragraph with: With the
TONE CONTROL switch set to W,
the output of the tone amplifier is
applied to the PREAMP OUT jacks."

Page 4 -

Column 2, 2nd paragraph - Replace
entire paragraph with: "With the
TONE CONTROL switch set to OUT,
the output of the X10 amplifier by-
passes the tone amplifier and is applied
directly to the PREAMP OUT jacks.

Page 4 -

Replace Figure 5 (Amplifier Simplified
Schematic) with Figure 5 contained
herein.

TECHNICAL SPECIFICATIONS -
For "Input Sensitivity and impedance,
High Level, replace 135mV, 100K
ohms with 135mV, 25K ohms.

Pages 6 -
and 7

Page 11 -

In "PERFORMANCE VERIFICATION TEST
PROCEDURE, replace as indicated:

(Bias Adjustment
- replace

ln paragraph C
Tests), sub~paragraph 4
10 watts" with 7 watts".

Page 13-

(Bias Adjustment
- replace

ln paragraph C
Tests), sub-paragraph 5
10 watts with 7 watts.

Page 14 -

Page 14 - In paragraph E (Total Hum and Noise
Test), sub-paragraph 4 - replace

"36 millivolts" with "25 millivolts.

Page 14- In paragraph G (Relay Operation),
sub-paragraph1 - Replace two

minutes. with "thirty seconds.

Addendum for Model 1200

(Relay Operation),
sub-paragraph 4 - Replace 10 Hz"
with "5 HZ".

Page 14- In paragraph G

In "TROUBLE ANALYSIS, replace as indicated:

In SYMPTOM 1, PROCEDURE b.-
Replace Check for open control
R526, 215-1005-1 bias assy." with
Check for open 215-1006 bias assy."

In SYMPTOM 5 - Add PROCE-
DURE c. Check 0502 for leakage.

In SYMPTOM 7 - Replace PROCE-
DURE a.with: "Check for defective
C505, C506, C508, C509, C510, C516,
C519, and C520."

In SYMPTOM 9 - Replace PROCEv
DURE b.with: Check output for
proper clipping into 4 ohm load with
25.5 volts AC output (positive and
negative levels must not vary more
than 1 volt at2 KHZ).

Add SYMPTOM 10: No Output".
and add PROCEDURE a. Check
R529, 0510, 0511, 0802, 0803,
0804, and 0805.

PARTS LIST - Parts list contained
herein identifies all parts which differ
from those used in units prior to
serial number 3501.

Replace Figure 13.(lnterconnect Board
- A1 Component Assembly Diagram)
with Figure 13.contained herein.

Page 18 -

Page 18-

Page 19 -

Page 19 -

Page 19 -

Pages 20 -
thru 25

Pages 26 -
and 27

Replace Figure 14.(Phono Amplifier
Board - A2 Component Assembly
Diagram) with Figure 14. contained
herein.

Page 28 -

Replace Figure 17. (Power Amplifier
Board - A5/A6 Component Assembly
Diagram) with Figure 17. contained
herein.

Page 31 --

Replace Figure 18. (Power Supply
Board - A7 Component Assembly
Diagram) with Figure 18. contained
herein.

Page 32 -

Replace Figure 20. (Model 1200
Schematic, A) with Figure 20.con-
tained herein.

Pages 34 -
and 35

Replace Figure 21. (Model 1200
Schematic, B) with figure 21. con-
tained herein.

Pages 36 -
and 37

I

Page 2

1' (as? 44;
we? - t

PARfs LIST

Reference Description Marantz Reference Description Marantz
Designation and/or Remarks Part Number Designation and/or Remarks Part Number
lNTERCONNECT
BOARD COMPONENT X10 AMPSOTARD
ASSEMBLY COMPON N
0 c 385 9 ASSEMBLY
c1 1 ., 520 1,:10 ,100v >106
ap '0 % C403 Cap., Elect, 1 1,30%, 381-1055
C102 Cap.,o.1501,¢20%, 250v 386-1022 35v
C103 Cap., 520pf, 110%, 100V 385-1069 0407 Cap., Elect, 1 of, i10%, 381-1055
c104 Cap., 015 01, :20%, 250v 386-1022 35v
R101 Res., C/F, 1K, 15%, 1/4w 434-4102 0414 Cap., Elect, 1 0011091,, 381-1055
R102 Res., C/F, 1K, 15%, 1/4w 434-4102 35"
R103 Res., Variable, Tandem, 420-1023 C417 cap" 5'9" 1 1'11 3814055
35v
25K _
R104 Res., Variable, Tandem. 420-1022-3 040 Trans'smr' NPN 46240382
50K 0402 Transistor, NPN 462-1038-2
R105 Res., C/F, 12K, :5%, 434-5122 0404 Transistor. NPN 462-1038-2
4W 0405 Transistor, NPN 462-10382
R106 $§WCIE 2.7K,:5%, 433-4272 TONE AMP BOARD
COMPONENT
R107 Res., C/F, 12K, i5%, 434-5122 ASSEMBLY
1
MW R307 (Not Used)
R108 . c F 2.7K,: D, 4 3-4272
:2va l ' 5 3 R322 (Not Used)
R113 Res., C/F, 33K, i5%, 434-5332 030 Trans'smr' NPN 462403
1/4W 0302 Transistor, NPN 462-1038-2
R114 Res., C/F, 33K, :5%, 434-5332 0304 Transistor. NPN 462-1038-2
4 0305 Transistor, NPN 462-1038-2
PHONO AMP BOARD POWER AMPLIFIER
COMPONENT BOARD COMPONENT
ASSEMBLY ASSEMBLY
R214 Rest, Variable, 25K, 420-1024 1:505 Cap" 36pr :5%, 100v 3354064
1 4w
/ (3503 Cap., 47pf,110%, 100v 385-1040
R222 R . c F . + 47223
1,64} / '2 meg-1096' 43 c512 Cap., 1000pf,110%, 385-1068
100v
R . v ' -102
235 11223;, arlable, 25K 420 4 C518 (Not Used)
0201 Transistor, NPN 462-10384 C519 cap" 0'1 1110:1096. 250V 3864000
0 . 6 38 -102
0202 Transistor, NPN 462-1038-1 C520 433; 800pf,110%, G 6
0205 Transistor, NPN 462-10384 CR503 Diode 460-1011
0206 Tran5lstor, NPN 462-10384 R501 Res., C/F, 4.7K, :5%, 4334472
1/2w
R508 Res., C/F, 91K, :5%, 434-5912
1/4w