Wohler AM-2B Operation And Maintenance Manual
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Wohler AM-2B Operation And Maintenance Manual

Stereo phase display scope
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OPERATION AND MAINTENANCE MANUAL
STEREO PHASE DISPLAY SCOPE
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II.
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Wohler Technologies, Inc.
31055 Huntwood Avenue
South San Francisco, CA 94080
Hayward, CA 94544
650 589-5676 Fax: 650 589-1355
Phone: (510) 870-0810
web: www.panoramadtv.com
US Toll-Free: 1-888-596-4537
e-mail: sales@panoramadtv.com
www.panoramadtv.com sales@panoramadtv.com
2001 Wohler Technologies, Inc. ALL rights reserved
AM-2B
Part Number 821602 Rev B
GENERAL DESCRIPTION
OPERATING INSTRUCTIONS
MAINTENANCE/CALIBRATION
SPECIFICATIONS
PARTS LIST
Panorama DTV
711 Grandview Drive
Fax: (510) 870-0811

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Summary of Contents for Wohler AM-2B

  • Page 1 711 Grandview Drive 31055 Huntwood Avenue South San Francisco, CA 94080 Hayward, CA 94544 650 589-5676 Fax: 650 589-1355 Phone: (510) 870-0810 Fax: (510) 870-0811 web: www.panoramadtv.com US Toll-Free: 1-888-596-4537 e-mail: sales@panoramadtv.com www.panoramadtv.com sales@panoramadtv.com 2001 Wohler Technologies, Inc. ALL rights reserved...

  • Page 2: General Description

    GENERAL DESCRIPTION The AM-2B is a CRT based display system used to verify proper stereo audio phase, amplitude and separation. The oscilloscope display shows the phase relationship between the left and right channels. Channel 1, or left, drives the scope Y-axis and channel 2, or right, drives the X-axis. The correct phase vector is marked on the graticule with a line and the words "IN PHASE"...
  • Page 3 Connect the AM-2B power cord into a grounded 3-pin AC mains power source. If there is any doubt as to which mains voltage the AM-2B is wired to accept, please refer to the power transformer wiring details on the AM-2B "Chassis Wiring" schematic and verify that the power transformer is wired correctly for the local mains voltage standard.
  • Page 4 SERVICE/MAINTENANCE TO BE PERFORMED BY QUALIFIED SERVICE PERSONNEL ONLY. Do not make adjustments or perform any internal service with power on unless another person capable of offering first aid or resuscitation is present. 2001 Wohler Technologies, Inc. ALL rights reserved...

  • Page 5: Maintenance And Calibration

    Set the test oscillator to output amplitude equal to the studio reference tone level (+4 dBm, +8 dBm, etc.). This should be cabled from the test oscillator to the AM-2B with a "Y" cable, as discussed in the section on operation.
  • Page 6 7. Increase the test oscillator output level by 3 dB. Adjust R113 and R141 so that the 21 dB LED on the left and right LED columns is just lighted. Repeat steps 5, 6 and 7 until no further improvement in calibration accuracy can be obtained. 2001 Wohler Technologies, Inc. ALL rights reserved...
  • Page 7 Right LED column cal. Scope "X" cal. R113 21 dB LED adjust, left R114 24 dB LED adjust, left R141 21 dB LED adjust, right R142 24 dB LED adjust, right CHASSIS Scope trace rotation 2001 Wohler Technologies, Inc. ALL rights reserved...

  • Page 8: Specifications

    Width 19 inches Depth 15 inches Weight 15 lbs. The AM-2B is intended to be installed in an EIA standard 19" rack space and occupies 2 standard rack units. TECHNICAL: CH-1/CH-2: 3-pin XLR, female, 50K ohm, balanced: Pin 1, chassis ground.
  • Page 9 R24,R25,R51,R52 3K, 1/4W 6-0021 R26,R27,R53,R54 150K, 1/4W 6-0033 R38,R43,R109,R137 909 Ohm, 1/4W 6-0095 200K POT 6-0181 R57,R58,R81,R82 100K, 1/4W 6-0005 R62,R86,R114,R142 5K POT 6-0046 R63,R69,R73,R74,R87, 4.75K, 1/4W 6-0105 R93,R97,R98 R64,R88 3.6K, 1/4W 6-0062 2001 Wohler Technologies, Inc. ALL rights reserved...
  • Page 10 348 OHM, 1/4W 6-0134 R112,R140 301 OHM, 1/4W 6-0097 R113,R141 500 OHM POT 6-0112 R115,R116 2.7K, 1/4W 6-0025 R117-R132 560 OHM, 1/4W 6-0030 R145,R148,R151,R154 60.4K, 1/4W 6-0128 R2,R6-R8,R29,R33-R35, NOT USED R59,R60,R83,R84 C1,C2,C5,C6 NOT USED 2001 Wohler Technologies, Inc. ALL rights reserved...

  • Page 11: Pin Header

    5-0028 C20,C33 .022mF @ 50V 5-0010 Q1-Q6,Q9-Q14 2N4401 7-0002 Q7,Q8,Q15,Q16 2N3739 7-0005 U1,U2,U5,U6 MC1741CP1 9-0006 U3,U7 MC1747CP2 9-0019 LM324 9-0021 U8,U9-U12 LM339 9-0022 U13,U14 LM3086N 9-0007 D1,D2 1N914 8-0003 30 PIN HEADER 11-0033 2001 Wohler Technologies, Inc. ALL rights reserved...
  • Page 12 LED DISPLAY BOARD AM-2B B & B SYMBOL NO. DESCRIPTION PART NO. D1,D10 T1-3/4 RED LED 8-0008 D2-D9,D11-D18 T1-3/4 GREEN LED 8-0006 30 PIN HEADER 11-0033 2001 Wohler Technologies, Inc. ALL rights reserved...
  • Page 13 HIGH VOLTAGE POWER SUPPLY BOARD AM-2B B & B SYMBOL NO. DESCRIPTION PART NO. 150K, 1/2W 6-0001 3.3M, 1W 6-0002 R3-R5 470K, 1/2W 6-0003 68K, 1/2W 6-0004 C1-C6 .1mF @ 2000V 5-0001 D1-D6 1N4007 8-0002 2001 Wohler Technologies, Inc. ALL rights reserved...
  • Page 14 5-0021 C4-C5 4100mF @ 25V 5-0022 NOT USED NOT USED MC7812CK 9-0012 MC7912CK 9-0013 BRIDGE, 600V 8-0017 BRIDGE, 100V 8-0016 NOT USED TRANSFORMER 17-0014 50/100 CARD EDGE 11-0002 J2,J3 3 PIN XLR 11-0005 2001 Wohler Technologies, Inc. ALL rights reserved...

  • Page 15: Power Switch

    CHASSIS AM-2B (continued) B & B SYMBOL NO. DESCRIPTION PART NO. J4-J8 3 PIN MOLEX 11-0007 P4-P8 3 PIN MOLEX 11-0008 POWER SWITCH 14-0003 2001 Wohler Technologies, Inc. ALL rights reserved...
  • Page 16 SYMBOL NO. DESCRIPTION PART NO. DS1,DS2 VU METER LAMPS 13-0004 M1,M2 VU METERS 4-0012 21-0005 FILTER/GRATICULE 19-0020 FUSE, 2 AMP 12-0001 (115-220 VAC OPERATION) FUSE, 1 AMP 12-0002 (230-260 VAC OPERATION) KNOBS 26-0008 2001 Wohler Technologies, Inc. ALL rights reserved...

  • Page 17: Warranty

    South San Francisco, CA 94080 South San Francisco, CA 94080 Hayward, CA 94544 650 589-5676 Fax: 650 589-1355 1-650-589-5676 FAX: 1-650-589-1355 Phone: (510) 870-0810 Fax: (510) 870-0811 web: www.panoramadtv.com US Toll-Free: 1-888-596-4537 e-mail: sales@panoramadtv.com www.panoramadtv.com sales@panoramadtv.com 2001 Wohler Technologies, Inc. ALL rights reserved...

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