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SERVICE MANUAL
P-700
PROFESSIONAL AMPLIFIER PROFESSION OFESSIONAL
Features, Operating Instructions................. Specifications........................................... Troubleshooting........................................ Diagrams.................................................. Parts List.................................................. Schematics...............................................
Page 2 Page 4 Page 5 Page 6 Page 8 Page 11
introduction
Congratulations on purchasing this Gemini P-700 Power Amplifier! You've made a really wise choice because this state-of-the-art amplifier has the latest features and technology and is backed by a three-year warranty! We know you're anxious to hook everything up and start mixing beats and cranking up the volume on those hot dance tracks, but we suggest reading this instruction manual first as there are some really cool features on this amplifier that we wouldn't want you to miss!
Common sense
Some of these things go without saying, but we're going to say them anyway! · Read all operating instructions before using this equipment. · To reduce the risk of electrical shock, do not open the unit. There are NO USER REPLACEABLE PARTS INSIDE. For all repairs or service questions please contact the Gemini Service Department or your authorized dealer to speak to a qualified Gemini Sound Products technician. · Be sure to allow adequate front and rear ventilation to avoid possible heat damage to your equipment. · Be sure that AC power is OFF and all level controls are set to MINIMUM before making connections. This will eliminate any chance of unexpected loud buzzes, pops or clicks that could damage your speakers. · DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. · Operators of electronic equipment should never be in contact with water · Keep your power amplifier grounded for maximum safety by always using a 3-prong plug. If you are using an extension cord, always use a 3-prong cord as well. · DO NOT USE ANY SPRAY CLEANER OR LUBRICANT ON ANY CONTROLS OR SWITCHES.
features
· ·
State-of-the-art circuitry for the finest sound quality and reliability High output power to drive professional speakers without clipping but also tame enough for home use Protection Circuitry (short circuit, thermal cutoff, sub/ultrasonic frequency filters, turn-on delay, main fuse, secondary fuses) Unbalanced stereo inputs with RCA type jacks Ground lift switch for achieving the quietest possible operation Large blue-light illuminated VU meters to give you greater control... and they look really cool Ultra-modern design with professional 19" rack mounts. Front-to-rear airflow with variable speed fan control for maximum cooling and quietest possible operation. Variable speed fan for quieter operation with softer music and home use. Compact 2U well balanced enclosure Steel reinforced chassis construction for durability and longevity.
·
· · ·
· ·
· · ·
hook it up
Okay, let's get connected! REAR PANEL Input Section: Input Jacks (1) Your amplifier has unbalanced stereo RCA type jacks, with the tip of the jack being positive (+) and the sleeve part being negative (-)/ground. Connect the output of your mixer here. Output Section: Disconnect unit from the AC power source before making any connections. Pay close attention to polarity when connecting your speakers. (Connect the positive wire to the red terminal and the negative wire to the black terminal). Connecting your speakers using the wrong polarity will not damage your speakers, but will impact the quality of the sound (lack of bass and incorrect stereo image). Speaker Outputs (3): the speaker output connectors are terminals that will accept a standard banana plug, or bare wire. Make sure that all the connections are clean when using bare wire connections. If any strands of wire from one connector touch the connector next to it, the sound will distort, and your amplifier will overheat.
FRONT PANEL · Power Switch (10): turns the unit on and off. · Power LED (9): the power LED lights when the power is on. If the power LED does not light, refer to the trouble-shooting guide. · Level Controls (7): control the input levels for each channel. · Large blue-light illuminated VU meters (8) display the output level of each channel.
operation
Stereo Operation The unit has two channels for stereo operation. Each channel provides a separate signal at the speaker outputs. The following instructions are for use with 4 or 8 speakers of matched power ratings. 1. With the power OFF, connect your input cables to the Channel A and Channel B inputs using the RCA INPUT JACKS (1) 2. Connect your speakers to the Channel A and Channel B SPEAKER OUTPUTS (3). (The total speaker load must be at least 4 per channel.) 3. With the LEVEL CONTROLS (7) of both channels set to zero (fully counterclockwise), turn the POWER SWITCH (10) ON. Okay, now try playing some music and/or talking into your microphone, and set the level of your input as high as you think you'll need it. This way it will be as high above the amplifier's noise floor as possible so you'll get the best possible sound with the least amount of noise. 4. Now adjust your LEVEL CONTROLS for each channel to your desired listening level. You also have the choice of keeping the volume of both speakers equal, or for certain situations you can adjust the volume so one side will be louder than the other.
NOTE:
Total speaker impedance must not be lower than 4 (Ohm) per channel
AC Power Section: · Fuse (4): replace with proper type and rating. · AC Inlet (6) is used to attach the power cord to the unit. · AC line voltage switch (5) allows reconfiguring amplifier for either 110-120 V or 220-240 V AC lines. · Ground Lift Switch (2) is used to lift the ground from the chassis. (See the Ground Lift Switch Instructions for more detail.)
Using the Ground Lift Switch Depending on how your sound system is hooked up, sometimes applying the ground will create a quieter signal path. Sometimes lifting the ground can eliminate ground loops and that annoying hum to give you quieter and cleaner overall sound. 1. With the power amp ON, listen to the system in idle mode (no music or signal) with the ground ON. The GROUND LIFT SWITCH (3) will be in the left position. 2. Turn the power OFF before moving the GROUND LIFT SWITCH (3). Now lift the ground by moving the GROUND LIFT SWITCH to the right. Turn the power back ON and listen to determine which position makes the overall sound quieter with the least amount of noise and hum.
specifications
Output Power EIA: 1kHz @ 1% THD, Wrms Both Channels Driven 8: .................................................70 Both Channels Driven 4: .................................................90 Dynamic Headroom, dB: At 8:...........................................................................1.5 At 4:...........................................................................3.3 Frequency Response:......................................30 Hz 50 kHz Total Harmonic Distortion: ................................less than 0.1%, typical 0.05% at 1 kHz Signal to Noise ratio:..................90 dB below rated power @ 8 Damping factor: ...................................greater than 150 @ 8 Slew rate:................................................................10 V/µS Voltage gain, dB:..............................................................27
CAUTION: DO NOT DISCONNECT THE AC
GROUND ON THE POWER AMPLIFIER IN ANY WAY. THIS CAN BE VERY HAZARDOUS!! Should you experience any difficulties or problems, you can first refer to the TROUBLESHOOTING GUIDE located on the following page. If you still cannot fix the problem, please call 1 (732) 738-9003 for Gemini Customer
Service.
Input Sensitivity (for rated power at 8):..........................1Vrms Input Impedance (unbalanced):.......................................10 k Power consumption (at rated power at 4, both channels driven): .................................................400 W AC Power Requirements: .....................110-120 V or 220-240 V 60 / 50 Hz. Indicators:..........................................1VU-meter per Channel 1 Power LED Cooling: ...............Variable Speed Fan, Front-to-Rear Forced Air
That's it !
Okay, that just about covers everything! NOW you're ready to grab a couple of great CD's or records, crank it up and get the party started!
Protection: .................................Short Circuit, Thermal Cut-off, Sub/Ultrasonic Frequency Filters, Turn-on Delay, Main Fuse, Secondary DC Fuses Connectors: Inputs:................................................................RCA Jacks Speaker Outputs:..............................................Binding Posts Dimensions:............................................19"W x 11"D x 3.5"H (483 x 280 x 89 mm) Weight :.....................................................12.9 lbs (5.85 kg)
Specifications and design are subject to
change without notice for purpose of improvement
troubleshooting
SY M PTO M
U N I D O ES N O T P R O D U C E S O U N D . T P O W ER L E D D O ES N O T L I H T . G
C A U SE
T T O P O W ER S W I C H N O T IN O N P O S I I N . P O W ER C A B L E N O T C O N N EC T E D T O A M P L I E R O R T O O U T L ET . FI V A C O U T L ET N O T A C T I E . M A IN A M P L IF IE R F U S E D E F E C T IV E .
S O L U T IO N
T T O M OV E PO W ER SW I C H TO O N PO SI I N. C O N N EC T P O W E R C A B L E T O A C S U P P L Y . T O C H EC K C O N D I I N O F O U T L ET . FI N R EP L A C E A M P L I ER M A I P O W E R F U S E O N . R EA R P A N EL W I H C O R R EC T T Y P E & R A T I G . T N
P O W ER L E D L I H T S , B U T N O S O U N D G I P R O D U C E D B Y A M P L I ER . S FI
N G NO I PUT SO U RC E SI NA L. N I P U T S O U R C E N O T C O N N EC T E D . V N D EF EC T I E IN P U T C O N N EC T I G C A B L E. S P EA K E R S N O T C O N N EC T E D . V D EF EC T I E S P EA K ER C A B L ES . N V S P EA K E R S Y S T EM I O P ER A T I E. FI S A M PL I E R ' L EV EL C O N T R O L S A R E S ET T O Z E R O .
O C H EC K F O R P R O P ER F U N C T I N O F IN P U T S O U R C E D EV I E (M I E R , C D P L A Y E R , ET C . C X ). O C H EC K IN P U T C A B L ES & C O N N EC T I N S . N O T R EP L A C E C A B L ES I Q U E S T I N W I H K N O W N G O O D C A B L ES . N T O C H EC K O P E R A T I G C O N D I I N , C A B L ES A N D S T A T U S O F S P EA K E R S Y S T EM . B E S U R E T H E L EV EL C O N T R O L S A R E P R O P ER L Y S ET .
S O U N D I P R E S EN T B U T V O L U M E I S S T O O L O W EV E N T H O U G H S O U R C E D EV I E (i e . C D P L A Y ER , M I E R ) C . : X O U T P U T I S ET T O A H I H L EV EL . S G
FI N A M PL I E R I P U T L EV EL C O N T R O L S A R E S ET T O O L O W .
A D JU S T L EV EL C O N T R O L S A S P E R I STR UC TI NS. N O
L O U D 50/ H Z O R 100/ 60 120 H Z H U M H EA R D A T A L L T I ES T H R O U G H T H E S P EA K E R S . M
M V I P R O P E R O R D EF EC T I E G R O U N D C O N N EC T I N A T I P U T S . O N I P R O P E R O R D E F EC T I E G R O U N D M V A T I P U T S O U R C E D EV I E(S ). N C M V I P R O P E R O R D EF EC T I E G R O U N D C O N N EC T I N O N A C O U T L ET . O N G RO U ND LO O P TH RO UG H A C LI E C O N N EC T I N / R A C K M O U N T IN G . O
N C H EC K F O R P R O P ER A C L I E G R O U N D A T P O W E R A M P A N D A L L I P U T D EV I ES . N C C C H EC K IN P U T C A B L ES F O R A L L D EV I ES A N D S I N A L P R O C ES S IN G A S W EL L A S I P U T G N C A B L ES T O P O W E R A M P L I ER . FI T O FT T C H EC K P O S I I N O F G R O U N D L I S W I C H A S P E R I S T R U C T I N S FO R L I I G T H E N O FT N G RO U ND. FT N N EV E R L I T H E A C L I E G R O U N D O N T H E PO W ER A M PLI ER. I YO U A R E N O T FI F T O T A L L Y FA M I I R W I H G R O U N D L I I G LA T FT N O R U N IFI A T I N P R O C E D U R ES , D O N O T C O A T T EM PT T H EM W I H O U T FI S T C O N S U L T T R I G Y O U R D EA L ER O R A Q U A L I D S O U N D N FIE T EC H N I I N FO R M O R E IN F O R M A T I N O N C A O G R O U N D IN G . I P R O P E R L Y D O N E, S U C H M P R O C ED U R ES C A N P O S E A S A F ET Y A N D / R O FI E H A Z A R D . R
S O U N D I D I T O R T ED . S S
S O N N DI TO RTI N O C C U R RI G I S O U RC E D EV I E (C D P L A Y E R , M I E R , ET C . C X ). N S G I P U T L EV EL I S ET T O O H I H .
C H EC K V U M ET E R S A D JU S T L EV EL C O N T R O L S A S P E R I STR UC TI NS. N O
FU S E B L O W S IN T E R M I T EN T L Y . T
M S S P EA K E R L O A D I P E D A N C E I T O O L O W . C H EC K F O R S H O R T S O N T H E O U T P U T S . N S M TYPE O R RA TI G O F TH E FUS E I NO T C H EC K Y O U R S P EA K E R I P E D A N C E. C O R R EC T . N C H EC K T H A T T H E F U S E T Y P E A N D R A T I G A R E C O R R EC T .
em ail
F o r se rv i -re l e d q ue sti n s yo u can e m ai u s at: se rv i ce at o l ce@ ge m i i j co m nd. F o r te ch n i su p p o rt yo u can e m ai u s at: te ch h e l ge m i i j co m cal l p@ nd.
B
9 10
7
8
8
7
6 4 2 3 3 1
5
PARTS LIST
PART # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 QUANTITY 1 1 1 1 2 3 4 1 3 1 1 1 2 2 2 2 3 1 1 1 1 1 1 1 1 14 NAME PANEL CONTROL MAIN CHASSIS TOP COVER HEAT SINK KNOB ROTARY (SMALL) PCB SUPPORT PAD FOOT POLYFORM SERIAL NO:LABEL GIFT BOX OWNER'S MANUAL WARRANTY CARD UK LABEL LABEL-GREEN LABEL-RED LABEL-YELLOW VDE LABEL A LABEL V LABEL LABEL-MADE IN TAIWAN LABEL-MADE IN CHINA SILICON GEL PE BAG 160×250mm PE BAG 650×650mm PE BAG 23×30cm BAND-HEAD TAP PING SCREW BTB-3 3×6(AB) BAND-HEAD TAP PING SCREW BTS-2 3×8(B) BAND-HEAD TAP PING SCREW BTS-3 3×6(AB) 33 111-046A 2 BAND-HEAD TAP PING SCREW BTS-3 3×6(AB) BAND-HEAD TAP PING SCREW/TWIN SCREW 3×12(AB) BAND-HEAD TAP PING SCREW/TWIN SCREW HEXAGON MACHINE SCREW PAN-HEAD TAPPING SCREW PTS-3 4×8(N) PAN-HEAD MACHINE SCREW PMS 5×8(B) BAND-HEAD MACHINE SCREW M4×15(AB) NUT (KNUT)4(B) PLAIN WASHER4(Y) SPRING WASHER4(Y) PAN-HEAD MACHINE SCREW 3×12(Y) NUT/WASHER 3(B) PAN-HEAD MACHINE SCREW MASTER CARTON 012-037 021-467 031-046 041-430 003-111 047-496 049-206 153-220 196-137 255-209 257-006 156-089 099-238 099-232 099-233 099-234 095-057 099-167 099-169 099-014 099-214 190-062 160-044 160-052 160-009 121-007A
34
110-187A
2
35
110-172A
1
36 37
146-717 111-060
6 1
38
102-111
2
39
107-022A
4
40 41 42 43 44 45 46 47 48 49 50 1 2 3
131-074 142-008 143-008 102-161 131-081 102-068
4 2 2 1 1 2
170-367
262-352 262-353 262-354
1 1 2
32
110-138
3
33
111-046A
2
PRINTED CIRCUIT BOARD P-700-1 PRINTED CIRCUIT BOARD P-700-2 PRINTED CIRCUIT BOARD P-700-3
5 6 7 8 9 10 11 12
074-189
2
INTEGRATED CIRCUIT TDA7294V SILICON TRANSISTORS 2SA1358 SILICON TRANSISTORS OR 2SB631 SILICON TRANSISTORS 2SC3421 SILICON TRANSISTORS OR 2SD600 SILICON TRANSISTORS 2SA733 (Q)(P) SILICON TRANSISTORS OR 2SA1015 (GR)(Y) BRIDGE RECTIFIER KBPC804W VU METER SILICON DIODE 1N4148 ZENER DIODE 1/2W 24V (RD24EB2) LED (GREEN) 5 ROTARY VR 10KA L:15MM SLIDE SWITCH 2P2C UL SLIDE SWITCH POWER SWITCH DC FAN 24V (80×80×25mm) AC INLET (IEC+FUSE) FUSE 20mm VBS UTE 5A 250V FUSE 20mm VBS UTE 4A 250V FUSE 20mm VBS UTE 2A 250V
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57
161-160 161-172 161-109 059-239 147-024
1 1 4 1 2
076-075 076-077 076-074 076-076 076-020 076-023
1
2P RCA JACK 4P SPEAKER TERMINAL FUSE CLIP JH-6 POWER TRANSFORMER EI-76×60 COIL 1.3µH 1.0×9× 9 1/2T AC CORD SVT AWG 18×3C VW-1 UL AC CORD 220V VDE AC CORD ARGENTINA AC CORD 230V BS METAL FILM RESISTORS 2W 8.2 CARBON FILM RESISTORS 1/2W 22K CARBON FILM RESISTORS 1/4W 82 CARBON FILM RESISTORS 1/4W 220 CARBON FILM RESISTORS 1/4W 750 CARBON FILM RESISTORS 1/4W 2.2K CARBON FILM RESISTORS 1/4W 5.1K CARBON FILM RESISTORS 1/4W 8.2K CARBON FILM RESISTORS 1/4W 22K CARBON FILM RESISTORS 1/4W 1M ELECTROLYTIC CAPACITORS N.P 10µ/50V ELECTROLYTIC CAPACITORS 10µ/50V ELECTROLYTIC CAPACITORS 22µ/50V
1
1
093-370 093-371 093-410 093-369 061-102 060-842 060-240 060-250 060-263 060-279 060-288 060-293 060-303 060-351
1 1 1 1 2 2 1 2 4 3 13 3 5 1
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
086-019 087-027 079-003 079-020
1 2 11 2
080-086 071-202 081-023 081-030 083-099 001-613
1 2 1 1 1 1
092-105
1
050-153
2
100-072 100-063 100-064
2 1 1
58
050-162
1
59
050-121
7
62 63 64 65 66 67
051-010 051-048 051-156
2 2 1
82 CERAMIC CAPACI83 TOR 10P/50V CERAMIC CAPACITOR 390P/50V 84 CERAMIC CAPACITOR UL 0.0047µ/400V POLYESTER CERAMIC CAPACITOR 0.047µ/50V 85
209-004
1
202-110
1
054-022
1
200-096
1
LEAD WIRE (WHITE) UL1015#18AWG 6×6 310mm LEAD WIRE (RED) UL1015#18AWG 6×6 310mm LEAD WIRE (BLACK) UL1007#24AWG 9×9 150mm JUMPER WIRE 0.7 T/52mm P=10mm JUMPER WIRE 0.7 T/52mm P=15mm JUMPER WIRE 0.7 T/52mm P=20mm PIN CONNECTOR HEAT-SHRINK TUB ING UL 28 35mm HEAT-SHRINK TUB ING UL 35 35mm TUBE 15mm TUBE 1 10mm CABLE TIES CV-100
86 87 88 89 90 91 92 93 94 95 96 97 98
060-703 060-703 060-703
4 5 1
146-509 190-075 190-230 190-063 190-063 003-605
4 1 2 2 2 3
1 2 3 4
MAIN PCB
D D6 X2 D4 C24 1 1N4148 10pF R31 22K +E Y1 D10 U1 3 2 2 IN + IN+MUTE OUT BOOTSTRAP -Vs -PWVs 15 4 8 C17 22uF50V 6 1.0uH C10 0.1uF100V MUTE STBY STBY-GND 14 L1 3 +Vs 5.1K 0.15 R25 22K C19 390pF C18 22uF25V 10 9 1 C1 10uF25V NP R29 5.1K SW1 R19 -E R23 5.1K C14 22uF25V +E R35 5.1K R10 5.1K D3 R11 5.1K FAN1 24V 0.13A 1N4148 R12 22K R12 22K R17 C12 8.2K C8 X7 GRN 0.047 R32 C3 10uF25V NP 22K +E D12 U2 3 2 C5 2 IN + IN+MUTE OUT BOOTSTRAP -Vs -PWVs 6 8 15 C20 0.1 Y9 2 2 -E 1 1 X3 T1 BRN 5 6 R38 5.1K F1 5A +E Q2 2SC3421 X10 BLU RED 4 7 3 ORG Y3 RED RED 230v F2 5A -E BLK 2 A WHT 1 8 BLK X6 D5 1N4148 Y2 BLK 2 4 C7 4700uF50V ZD1 24V 0.5W RED X4 KBPS08-02 REC1 Y1 +24V +24V C6 4700uF50V R8 5.1K 4 4 4 2 R7 2.2K R6 5.1K C2 22uF50V R2 220 B R1 750 2 2 1 Y3 M2 1 X9 TDA7294V D1 1N4148 Right ch. OUTPUT D2 1N4148 22uF50V 1 MUTE STBY STBY-GND 14 C22 +Vs 0.15 1 10 22uF25V 9 1 C23 390pF 5.1K C16 R28 22K 4 R16 3 7 L2 1.0uH C25 0.1uF100V 2 IN +PWVs 13 C15 0.1 1N4148 R37 8R2 1W X8B 1N4148 D11 Y5 X5 R34 750 Y7 GRN 10pF 24V 0.5W 10uF25V C21 R27 5.1K R30 82 Q3 2SA1015 2 2 R13 2.2K 1 X11 Y11 1 Q1 2SA1358 8.2K Left ch. INPUT TDA7294V R21 22K Left ch. OUTPUT R26 5.1K 4 1 R15 3 7 X8A C13 IN +PWVs 13 R22 8R2 1W 1N4148 1N4148 D8 X1 R33 750 B 4 4 4 2 R14 2.2K C4 22uF50V R4 220 2 3 5.1K 750 2 R3 R5 1N4148 1 Y2 M1
D
1
RV3 10K
2
Left ch. GAIN
3
3
+
1 3
A
"Ground lift"
C J1 R9 1M 8.2K R18
C
1
RV3 10K Right ch. INPUT
2
3
ZD2
D13 1N4148
T
C9 100uF25V
Right ch. GAIN
POWER PCB
P3
LD1 GRN "POWER"
P4
B
P1
SW2 SW-POWER
P5
B
3
3
C101
FUSE
3
+
1 3
P2
4A 115V / 2A 230V
F
L
E
N
SW3 VOLTAGE SELECTOR
115v
AC INLET
A Gemini Sound Products Corp.
1
A
POWER AMPLIFIER P-6
Size Orcad D Scale
FCSM No.
DWG No.
Rev
Sheet 0 of 0 2 3 4
1
In the USA: If you experience problems with this unit, call 1-732-738-9003 for Gemini Customer Service.
Do not attempt to return this equipment to your dealer.
Parts of the design of this product may be protected by worldwide patents. Information in this manual is subject to change without notice and does not represent a commitment on the part of the vendor. Gemini Sound Products Corp. shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual. No part of this manual may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, electrical, mechanical, optical, chemical, including photocopying and recording, for any purpose without the express written permission of Gemini Sound Products Corp. It is recommended that all maintenance and service on this product is performed by Gemini Sound Products Corp. or its authorized agents. Gemini Sound Products Corp. will not accept liability for loss or damage caused by maintenance or repair performed by unauthorized personnel.
Worldwide Headquarters · 120 Clover Place, Edison, NJ 08837 · USA Tel: (732) 738-9003 · Fax: (732) 738-9006
France · G.S.L. France · 11, Avenue Leon Harmel, Z.I. Antony, 92160 Antony, France Tel: + 33 (0) 1 55 59 04 70 · Fax: + 33 (0) 1 55 59 04 80 Germany · Gemini Sound Products GmbH · Ottostrasse 6, 85757 Karlsfeld, Germany Tel: 08131 - 39171-0 · Fax: 08131 - 39171-9 UK · Gemini Sound Products · Unit C4 Hazleton Industrial Estate, Waterlooville, UK P08 9JU Tel: 087 087 00880 · Fax: 087 087 00990 Spain · Gemini Sound Products S.A. · Rosello, 516, Barcelona, Spain, 08026 Tel: 349-3435-0814 · Fax: 3493-347-6961
© Gemini Sound Products Corp. 2002
All Rights Reserved