-iin Model 2252 Stereop hon ic Receiver MARANTZ CO., INC. 20525 NORDHOFF STREET, CHATSWORTH, CALIFORNIA 91311 A WHOLLY-OWNED SUBSIDIARY OF SUPERSCOPE INC.
FOREWORD GENERAL For optimum performance and enjoyment from your Model 2252 Stereo Receiver, please study these instructions carefully. Installation and operation are not complicated, but its flexibility and features deserve your becoming familiar with its controls and connections. This manual is divided into two parts. The first covers installation and operation in simple, nontechnical language. The second describes the 2252 in more detail with technical specifications and functional explanations.
Maintenance Volume Control General Fuse Replacement Cleaning FM Fron End Control Mono Functions Circuits Speaker Service In Case Notes Phasing of Difficulty Stereo Demodulator General Selector AM Tuner Specifications Switch Tape Recording and Dubbing 11 2 6114 8 4 1 5 14 651 11 8 71 2 69753 Amplifier Repacking for Shipment Recording Dolbyized Technical Dubbing Description Tape Monitor SwitchFM Programs Muting Repairs Circuit Phono EO Amplifier FM IF1 Amplifier CONTENTS TABLE OF liST OF IllUSTRATIONS 1.
, ~-l Figure 1. Rear Panel Connection Facilities PREPARATION FOR USE REAR PANEL CONNECTIONS TAPE JACKS Figure 1 shows the location of input and output jacks on the rear panel. These jacks are for "permanent" connections. Front panel jacks and their use will be discussed later. All connections to the rear panel should be made with the power to the entire system turned off. The rear panel signal connections are arranged in stereo pairs.
75·ohm coaxial cable without "F" connector "'i"d1 Figure 2. AM/FM Antenna Connection signals available at this pair of jacks are not affected by the BALANCE, VOLUME, TREBLE, BASS, HI FILTER, LOUDNESS, and MONO pushswitches on the front panel. AUX INPUTS The AUX INPUT jacks are for miscellaneous high level signal sources such as additional tuners and/or receivers, tape players, phonographs that provide RIAA equalized high level output, TV sound outputs and other external components.
- ---c SPEAKER LEFT n ]1-' III I 1 rl SPEAKER SYSTEMS· . SYSTEM 1 J 111 J ·1] r1l1T --::....-:-~. 1 + lTTI ]'1fll! SYSTEM ltjldJ ldJ ldJ j TTJ n IIU· r~I··~ r r -I!] I1I:r ILLllrili ~ LIT --- ~~R~~L~~ SYSTEM RIGHT ITIH .~._--::---_~. 2 - - ~~l6JlaJ[BJ ffi + SPEAKER SYSTEM 2 Figure 4. FM QUADRADIAL OUTPUT JACK Loudspeaker System Connections Iy breaks the internal connections to prevent the external equipment from being bypassed.
2. Place the speakers in the center of the room. 3. Depress the MONO pushswitch and playa record (or radio or tape) with strong bass tones at a low volume level. Center the BALANCE control. CONNECTION With the front panel POWER pushswitch "OUT", plug the line cord into an electrical outlet supplying the proper voltage. CAUTION: 4. Position the speakers about six inches apart, face-to-face. Listen, particularly to the apparent loudness of the bass tones.
---..--_.~ FM 26~S ,_Lalanc:e-R TAPE; t MONITOR LOUDNESS FM MUTIP«3 ,..-SPKR--. SYSTEM 1 SVSTEM:2 • .. e selector bass I'nid treble Figure 5. .•olurne MAIN CONTROLS AND SWITCHES When operating the Model 2252 Stereo Receiver for the first time, follow these simple directions. Later, full advantage can be taken of its versatility with the remaining controls and pushswitches. POWER SWITCH Step 2. Connect the speakers to the SYSTEM 1 speaker terminals. Step 3.
BASS, MID AND TREBEL CONTROLS FM-25/lS SWITCH These controls are used to adjust the tonal balance of program material to suit individual listening preference. The Model 2252 is equipped with two meters, a SIGNAL STRENGTH Meter and a TUNING Meter. To listen to a Dolbyized FM broadcast, connect a Dolby noise reduction adaptor between the TAPE lOUT and IN jacks on the rear panel of the Model 2252. Depress the FM-25/lS pushswitch, and depress the TAPE 1 MONITOR switch.
HI FILTER SWITCH TAPE RECORDING This switch can be used to reduce high frequency noise such as that associated with the playing of poorly recorded tapes or worn disc recordings. When the AM tuner is being used, this switch will help to suppress considerably the high pitched "whistle" caused by adjacent AM channel interference. This filter will also, along with high frequency noise, slightly attenuate high frequency program material, and should therefore be used judiciously.
TECHNICAL DESCRIPTION GENERAL Figure 7 is a block diagram of the Model 2252 Receiver showing the main functional elements and input and output signal routing. For clarity, only the left audio channel is shown; the right audio channel is identical. The MONO switch is common to both channels. All audio controls are ganged to their counterparts in the right channel. FM FRONT END FM antenna signals are applied through the antenna coil to the dual gate MOSF ET RF amplifier.
FM broadcasts, turntable (PHONO), tape player, or any other source capable of providing 200 mV output level (AUX). The SELECTOR switch connects the inputs of the TONE control amplifier to the desired source. TAPE 1 MONITOR SWITCH The TAPE 1 MONITOR switch selects between source and TAPE 1 INPUT jacks. When the TAPE 1 MONITOR switch is in its normal "out" position, the preamplifier receives its input from the SELECTOR switch.
PM LEVEL AMP. PM AM ~~PHONES ~HEAD. SY$TEM·1 SPEAKER PHONO AUX PRE OUT MAIN 'N MAIN AMP. 11APE·2 'N TAPE-2 OUT FROM OTH!:R CH, TAPE-1 'N FILTER sw. o TAPE-' OUT LOUDNESS sw. SIGNAL STRENGTH METER TUNING METER ...• o Figure 7.
MAINTENANCE CLEANING fuse and replace it if necessary. If the dial lamps are properly illuminated but one channel is inoperative, check the loudspeaker cord of the inoperative channel for a short circuit, broken wire, loose connection or other fault. If the loudspeaker connections appear satisfactory, check for a broken, open, shorted, corroded, or disconnected shielded cable between the receiver and the input equipment. Check for improper setting of the BALANCE control. Look for any other visible fault.
I.M. Distortion (I.H.F. method, 60 Hz and 7 kHz mixed 4 : 1 at rated power output) at 8 ohm load impedance at 4 ohm load impedance Damping Factor (at 20 Hz) Sensitivity (at MAIN IN) Impedance (at MAIN IN) Frequency Response for Power Amp Only (at 1 Watt output, 20 Hz to 20 kHz) Preamplifier Phono 0.1 % 0.1 % 45 1.5 V 30 k ohms ±0.2 dB Section: Input Overload at 1 kHz 100 mV Equivalent Input Noise 1.5 j1V Dynamic Range :................................
1000 Hz 6000 Hz Distortion (Mono and Stereo) at 50 dB Quieting, 1000 Hz Hum and Noise at 65 dBf (1000 pV) Mono ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Frequency Response 30 Hz to 15 kHz Mono Stereo Capture Ratio at 45 dBf ( 100 /lV) at 65 dB f (1000 /l V) Alternate Channel Selectivity Spurious Response Rejection Image Response Rejection I.F. Rejection (Balanced) A.M.
SERVICE NOTES REPAIRS Only the most competent and qualified service technicians should be allowed to servicethe Model 2252. The Marantz Company and its factorytrained warranty station personnel have the knowledge and special equipment needed for repair and calibration of this precision instrument. In the event of difficulty, call the toll free telephone number listed on the back of the Warranty to obtain the name and address of the Marantz Authorized Service Station nearest your home or business.
The Sound of Marantz is the compelling warmth of a Stradivarius. It is a dancing flute, a haughty bassoon and the plaintive call of a lone French horn. The Sound of Marantz is the sound of beauty, and Marantz equipment is designed to bring you the subtle joy of its delight. Wonderful adventures in sound await you when you discover that the Sound of Marantz is the sound of music at its very best. PRINTED IN JAPAN DOLBY is a trademark of Dolby Laboratories Inc.
