MARANTZ SR225 (01) PDF MANUAL

Parts for your MARANTZ stereo are generally available within 72 hours throughout the nation via a toll-free line to the National Parts Depot in California. Phone orders are encouraged to eliminate mail delays. If ordering by mail, use MARANTZ parts order forms available from the National Parts Depot.

USA Contact:

SUPERSCOPE NATIONAL PARTS DEPARTMENT
20525 Nordhoff Street
Chatsworth, California 91311
Phone: 1-800-423-5108 or 1-213-998-9333

Required Information for Ordering:

1. Complete address.

2. Complete part numbers.

3. Complete description of parts.

4. Model number for which part is required (indicate MARANTZ).

5. Account number (for account customers only).

Direct consumers will be provided with the current retail price quotation on available parts to advise them of the cost of parts and shipping.

CAUTION: After servicing this appliance and prior to returning to the customer, perform this mandatory test.

Procedure:

1. Ensure the unit is NOT connected to AC mains.

2. Turn the unit’s Power switch ON.

3. Measure the resistance between either primary AC cord connector pin and the face or front Panel of the product, controls, and chassis bottom.

Requirement: The resistance measurement must be greater than 1 Megohm.

If the resistance is less than 1 Megohm, the unit must be repaired and corrected before AC power is applied, and verified before return to the user/customer.

(Ref. UL Standard No. 1270. Para. 66. 3. D – Mandatory Test after servicing Electrical Appliances, effective 7-1-83).

Item	Manufacturer and Model No.	Use
AM Signal Generator		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 Model 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	ASO alignment
Circuit Tester		Trouble shooting
DC VTVM	Fluke Model 8,000 “Digital” Simpson Model 313, Triplet Model 801	Voltage measurements (DC)
AC Wattmeter	Simpson Model 1379	Monitors primary power to amplifier
AC Ammeter	Commercial Grade (1-10A)	Monitors amplifier output under short circuit condition
Line Voltmeter	Simpson Model 1359	Monitors potential of primary power to amplifier
Variable Autotransformer	Superior Electronic Co., Powerstat Model 116B-10A	Adjusts level of primary power to amplifier
Shorting Plug	Use phono plug with 600-ohm across center pin and shell	Shorts amplifier input to eliminate noise pickup
Output Load (8 ohms, ± 0.5%), 100W)	Commercial Grade	Provides 8-ohm load for amplifier output termination
Output Load (4 ohms, ± 0.5%, 100W	Commercial Grade	Provides 4-ohm load for amplifier output termination.

Note: Set the Function Switch to the “FM” position. Connect a Dummy Resistor of 47K-ohms across the output terminals before alignment.

STEP	SIGNAL SOURCE CONNECTION	SIGNAL FREQUENCY	INDICATOR CONNECTION	SET DIAL POINTER TO:	ADJUST
1	RF GENERATOR TO FM ANTENNA TERMINALS THROUGH MATCHING NETWORK (300 OHMS, BALANCED). (MAINTAIN RF LEVEL BELOW LIMIT.)	87.35 MHz	VTVM TO L OR R CHANNEL OUTPUT	TUNING CAPACITOR MINIMUM CLOSED	L3 FOR MAXIMUM OUTPUT
2		108.25 MHz		TUNING CAPACITOR MAXIMUM OPEN.	OSC TRIMMER CAPACITOR FOR MAXIMUM OUTPUT
3		90 MHz		90 MHz	L1, L2, FOR MAXIMUM OUTPUT.
4		106 MHz		106 MHz	ANT. RF. TRIM. CAP. FOR MAXIMUM OUTPUT.
5	REPEAT STEPS 1 TO 4.
6	CHECK OVERALL RESPONSE CURVE STEPS AS NECESSARY TO OBTAIN MAXIMUM SENSITIVITY.
7	RF GENERATOR 1 MV (OR 300 UV, ONLY STEP 10) OUTPUT TO FM ANTENNA TERMINALS THROUGH MATCHING NETWORK. (300 OHMS, BALANCED)	98 MHz	CENTER METER CONNECT TO ANY WAY OF R212 (22K Ω), T202 FOR METER CENTER, T203 FOR DISTORTION MINIMUM	98 MHz	L202 CORE FOR MINIMUM DISTORTION. (WHI)

Note: Set the Function Switch to the “FM” position and the Mode Switch to the “STEREO” position. Connect a Dummy Resistor of 47K-ohms across the output terminals before alignment.

STEP	SIGNAL SOURCE CONNECTOR	SIGNAL FREQUENCY	INDICATOR CONNECTION	SET DIAL POINTER TO:	ADJUST
1	RF GENERATOR TO FM ANTENNA TERMINALS THROUGH MATCHING NETWORK. (300 OHMS, BALANCED), WITH 1 MV FM STEREO GENERATOR RF LEVEL	NO MODULATION.	FREQUENCY COUNTER TO J310	CY	R325 SO FREQUENCY COUNTER MAY READ 76 KHZ.
2	AND 100% MODULATION (PILOT 9%)	STEREO, LEFT (1,000 HZ)	VTVM TO RIGHT CHANNEL OUTPUT.	98 MHZ	R311 FOR MAXIMUM OUTPUT AND SAME SEPARATION IN BOTH CHANNELS.
3		STEREO, RIGHT (1,000 HZ)	VTVM TO LEFT CHANNEL OUTPUT.

Note: Set the Function Switch to the “AM” position. Connect a Dummy Resistor of 47K-ohms across the output terminals before alignment.

STEP	SIGNAL SOURCE CONNECTION	SIGNAL FREQUENCY	INDICATOR CONNECTION	SET DIAL POINTER TO:	ADJUST
1	SWEEP GENERATOR TO OSC VARIABLE CAP.	450 KHz MARKER.	OSCILLOSCOPE t. T.	QUIET POINT ON BAND.	T201 FOR MAXIMUM AND SYMMETRIC RESPONSE.

Note: Set the Function Switch to the “AM” position. Connect a Dummy Resistor of 47K-ohms across the output terminals before alignment. Use the Test Loop as shown in Figure 3 for signal application.

STEP	SIGNAL SOURCE CONNECTION	SIGNAL FREQUENCY	INDICATOR CONNECTION	SET DIAL POINTER TO:	ADJUST
1	APPLY THE SIGNAL TO THE AM LOOP ANTENNA FROM THE RF GENERATOR, USING THE TEST LOOP, AS PER THE FIGURE 3.	520 KHZ	VTVM TO L OR R CHANNEL OUTPUT.	TUNING CAPACITOR MINIMUM CLOSED.	L102 FOR MAXIMUM OUTPUT.
2		1,639 KHZ		TUNING CAPACITOR MAXIMUM OPEN.	OSC. TRIM. CAP. FOR MAXIMUM OUTPUT.
3		600 KHZ		600 KHZ	AM BAR ANT FOR MAXIMUM OUTPUT.
4		1,400 KHZ		1,400 KHZ	ANT. TRIM. CAP. FOR MAXIMUM OUTPUT.
5	REPEAT STEPS 1 TO 4 AS NECESSARY TO OBTAIN MAXIMUM SENSITIVITY.

AUDIO SECTION

• Power Output Per Channel (RMS 8 OHMS): 25W
• Total Harmonic Distortion (at RMS 8 OHMS): 0.3%
• Damping Factor (8 OHMS): 30
• Frequency Response:
  • Phono (RIAA): ± 1.0 dB
  • Aux (±2.0 dB): 20 Hz – 20 kHz
• Signal-to-Noise Ratio:
  • Phono: 65 dB
  • Aux: 80 dB
• Input Terminals:
  • Phono: Input Sensitivity/Impedance: 2.5 mV/47 kohms
  • Aux: Input Sensitivity/Impedance: 150 mV/25 kohms

FM TUNER SECTION

• Frequency Range: 87.5 – 108 MHz
• Usable Sensitivity:
  • DIN Mono (S/N 26 dB, 75 ohms): 3 uV
  • DIN Stereo (S/N 46 dB, 75 ohms): 25 uV
• Alternate Channel Selectivity (98 MHz): 60 dB
• Signal-to-Noise Ratio (98 MHz):
  • Unweighted: Mono 66 dB, Stereo 63 dB
  • Weighted: Mono 70 dB, Stereo 65 dB

MW TUNER SECTION

• Frequency Range: 505 – 1,650 kHz
• Usable Sensitivity (20 dB S/N 30% Mod., 1 MHz): 300 uV
• Selectivity: 35 dB

GENERAL

• Power Requirements: 120V AC 60Hz
• Power Consumption (at Rated Output, Both Channels Operating): 90W
• Dimensions:
  • Panel Width: 416 mm
  • Panel Height: 100 mm
  • Depth: 194 mm
• Weight (Unit alone): 4.9 kg

Specifications and appearance are subject to change for modification without notice.