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M490C
Type module
Category INPUT-PRE-AMPS
Try it simulator & front panel · download package (zip)
Earliest dated evidence 1978|11 — manual issue date
Evidence "MANUAL ISSUE #4 JUNE 1978" in PUBLIC/Manuals + tech DOCUMENTS/Modules/M490C - Line Input/M490C - 002.jpg
Confidence high
All years found 1978|11
Used in jobs R1400-R2400-sales
Variants M490, M490A, M490B, M490D, M490E, M490F, M490G, M490H, M490J, M490K, M490L, M490M, M490N, M490T
Folder Modules/INPUT-PRE-AMPS/M490C

Connections and circuit (ideal SPICE model)

Drawn live from its RTO-144 connections: run the generator, turn the gain, watch the VU. Open the netlist to see how the model is built.

Pinout & connections

Each contact as its own documents name it: 15 named (15 high confidence). An empty slot is a contact no page names. Hover a contact for its source; the table under the drawing lists them.

CONNECTOR P1 · 1–4NUMBERED SIDEP1-1: LEFT PGRM 1 audio bus / pair · confidence high rto-144 · M490C.rto144.json, p. 11LEFT PGRM 1 +BUSP1-2: LEFT PGRM 1 audio bus / pair · confidence high rto-144 · M490C.rto144.json, p. 12LEFT PGRM 1 −BUSP1-3: RIGHT PGRM 1 audio bus / pair · confidence high rto-144 · M490C.rto144.json, p. 13RIGHT PGRM 1 +BUSP1-4: RIGHT PGRM 1 audio bus / pair · confidence high rto-144 · M490C.rto144.json, p. 14RIGHT PGRM 1 −BUS
CONNECTOR P2 · A–ZLETTERED SIDEP2-A: MIC IN A audio in · confidence high rto-144 · M490C.rto144.json, p. 1AMIC IN A −INBP2-C: MIC IN B audio in · confidence high rto-144 · M490C.rto144.json, p. 1CMIC IN B −INDP2-E: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “22 - P2-E P2-H”Esignal not read?P2-F: INSERT SEND audio out · confidence high rto-144 · M490C.rto144.json, p. 1FINSERT SEND −OUTP2-H: INSERT RETURN audio in · confidence high rto-144 · M490C.rto144.json, p. 1HINSERT RETURN −INJKLMP2-N: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “Pz-N”Nsignal not read?P2-P: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “P2-P Ch”Psignal not read?RSTUP2-V: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “Pz-V”Vsignal not read?WXYZCONNECTOR P2 · 1–22NUMBERED SIDEP2-1: MIC IN A audio in · confidence high rto-144 · M490C.rto144.json, p. 11MIC IN A +IN2P2-3: MIC IN B audio in · confidence high rto-144 · M490C.rto144.json, p. 13MIC IN B +IN4P2-5: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “P2-6 ?2-8 P2-5”5signal not read?P2-6: INSERT SEND audio out · confidence high rto-144 · M490C.rto144.json, p. 16INSERT SEND +OUTP2-7: INSERT RETURN audio in · confidence high rto-144 · M490C.rto144.json, p. 17INSERT RETURN +IN891011P2-12: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “EXt P2-12 OFF”12signal not read?P2-13: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “P2 - 13 ch”13signal not read?14P2-15: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “P2-15”15signal not read?16P2-17: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “P2 - 17”17signal not read?P2-18: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “Pz-18”18signal not read?P2-19: -25 V power rail · confidence high rto-144 · M490C.rto144.json, p. 119-25 VPWRP2-20: COMMON ground / common · confidence high rto-144 · M490C.rto144.json, p. 120COMMONGNDP2-21: +25 V power rail · confidence high rto-144 · M490C.rto144.json, p. 121+25 VPWRP2-22: signal not read used on a schematic, signal not read · confidence low schematic · 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1 “Ce2i >P2-22,2 Cok 1r4003”22signal not read?
KEYIN audio inOUT audio outBUS audio bus / pairPWR power railGND ground / common? used on a schematic, signal not readhigh: sheetlow: schematic
M490C-25 V P2-19+25 V P2-21M490CMIC IN AP2-A·P2-1MIC IN BP2-C·P2-3INSERT RETURNP2-H·P2-7LEFT PGRM 1P1-1·P1-2RIGHT PGRM 1P1-3·P1-4INSERT SENDP2-F·P2-6COMMON P2-20CONNECTED TO · CONSOLES & JOBS (1)R1400-R2400-salesconsole / job

pinout (SVG) · connections (SVG) · pins (JSON)

Pin evidence — 26 contacts
PinSignalKindConfidenceRead fromSource
P1-1LEFT PGRM 1audio bus / pairhighrto-144M490C.rto144.json, p. 1
P1-2LEFT PGRM 1audio bus / pairhighrto-144M490C.rto144.json, p. 1
P1-3RIGHT PGRM 1audio bus / pairhighrto-144M490C.rto144.json, p. 1
P1-4RIGHT PGRM 1audio bus / pairhighrto-144M490C.rto144.json, p. 1
P2-AMIC IN Aaudio inhighrto-144M490C.rto144.json, p. 1
P2-1MIC IN Aaudio inhighrto-144M490C.rto144.json, p. 1
P2-CMIC IN Baudio inhighrto-144M490C.rto144.json, p. 1
P2-3MIC IN B
also: INPUT (schematic)		audio inhighrto-144M490C.rto144.json, p. 1
P2-E—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“22 - P2-E P2-H”
P2-5—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“P2-6 ?2-8 P2-5”
P2-FINSERT SENDaudio outhighrto-144M490C.rto144.json, p. 1
P2-6INSERT SENDaudio outhighrto-144M490C.rto144.json, p. 1
P2-HINSERT RETURNaudio inhighrto-144M490C.rto144.json, p. 1
P2-7INSERT RETURNaudio inhighrto-144M490C.rto144.json, p. 1
P2-N—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“Pz-N”
P2-12—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“EXt P2-12 OFF”
P2-P—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“P2-P Ch”
P2-13—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“P2 - 13 ch”
P2-15—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“P2-15”
P2-17—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“P2 - 17”
P2-V—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“Pz-V”
P2-18—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“Pz-18”
P2-19-25 Vpower railhighrto-144M490C.rto144.json, p. 1
P2-20COMMON
also: COMMON (rto-144)		ground / commonhighrto-144M490C.rto144.json, p. 1
P2-21+25 Vpower railhighrto-144M490C.rto144.json, p. 1
P2-22—used on a schematic, signal not readlowschematic1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg, p. 1
“Ce2i >P2-22,2 Cok 1r4003”

Pictures

1978 - M490C - 002.jpg1978 - M490C - 000 - cover.jpg1978 - M490C - 001.jpg1978 - M490C - 003.jpg1978 - M490C - 004.jpg1978 - M490C - 005.jpg1978 - M490C - 006.jpg1978 - M490C - 007.jpg1978 - M490C - 008.jpg1978 - M490C - 009.jpg1978 - M490C - 010.jpg1978 - M490C - 011.jpg1978 - M490C - 012.jpg1978 - M490C - 013.jpg1978 - M490C - 014.jpg1978 - M490C - 015.jpg1978 - M490C - 016.jpg1978 - M490C - 017.jpg1978 - M490C - 018.jpg1978 - M490C - 019.jpg1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg1978 - M490C - Front Panel.jpg1978 - M490C - Functional.jpg1990 - R1400 - R2400 - 010.jpg

Dates found in the documents

Year Kind Text File
1978|11 manual issue date MANUAL ISSUE #4 JUNE 1978 1978 - M490C - 002.jpg

Physical manual inventory

Item Location Status Scanned
M490C - Line Input SCANNED BUT NEEDS STICHING
M490C - Line Input Recently scanned and stiched by WB

Photos & scans (23)

Year File
1978|11 1978 - M490C - 000 - cover.jpg note
1978|11 1978 - M490C - 001.jpg note
1978|11 1978 - M490C - 002.jpg note
1978|11 1978 - M490C - 003.jpg note
1978|11 1978 - M490C - 004.jpg note
1978|11 1978 - M490C - 005.jpg note
1978|11 1978 - M490C - 006.jpg note
1978|11 1978 - M490C - 007.jpg note
1978|11 1978 - M490C - 008.jpg note
1978|11 1978 - M490C - 009.jpg note
1978|11 1978 - M490C - 010.jpg note
1978|11 1978 - M490C - 011.jpg note
1978|11 1978 - M490C - 012.jpg note
1978|11 1978 - M490C - 013.jpg note
1978|11 1978 - M490C - 014.jpg note
1978|11 1978 - M490C - 015.jpg note
1978|11 1978 - M490C - 016.jpg note
1978|11 1978 - M490C - 017.jpg note
1978|11 1978 - M490C - 018.jpg note
1978|11 1978 - M490C - 019.jpg note
1978|11 1978 - M490C - 490-02-004 - ADDED CEB ENG.jpg note
1978|11 1978 - M490C - Front Panel.jpg note
1978|11 1978 - M490C - Functional.jpg note

Consoles & jobs it is connected to (1)

Their own drawings name this module.

Job Year Drawing Page
R1400-R2400-sales 1990 - R1400 - R2400 - 010.jpg 1

Named in other drawings & documents (2)

File Page
19xx - RTO-144 - Module RTO-144 Jumper calculator.xlsx 1
1978 - M490G - Mic Input Module (2).pdf 22

From the manuals

Each manual split into its sections. Text that is the same in many Ward-Beck manuals (warranty, address, standard notes) is kept once on the Boilerplate page and linked.

Specifications (1)

Technical Data — 248 words · 1978 - M490C - 004.jpg, page 1

M490c LINE InPUT MODULE Input Sensitivity: -10 to +20 dBm (ref_ 600 ohm source) _ Frequency Response: +0 .5 dB from 30 Hz to 20 kHz Noise: 70 dB be ]ow nomina ] operating Teve1 _ wi th SENSITIVITY set at -10 dBm, mixing attenuator set at 15 dB in-hand (20 Hz to 20 kHz) Noise decreases a $ SENSITIVITY is decreased _ Harmonic Distortion: Less than 0 .

35 % from 30 Hz to 20 kHz at 20 dB above nomina] operating Teve 1 or Tess Less than 0 . 1% at kHz at 20 dB above nomina operating Teve1 or Tess _ Less than 0 . 5% at kHz through cue channel at 20 dB above nomina operating Tevel or Tess _ Source Impedance: 600 ohms or Tess , balanced/unbalanced.

Input Impedance: 24 ,000 ohms Output Impedances 30 , 000 ohms = ba Tanced (program circuits) 60 ,000 ohms ba lanced (cue circuits) _ Output Leve] dBm nomi na ] +25 dBm maximum (equivalent voltage 600 ohms ) _ Input and output terminals designated by numbers are in phase , or Tower number 0 f numbered pa jr is in phase with lower number 0 f other numbered pa ir _ Phasing: Logic Input Levels: (To operate ch On , Ch 0FF CUE.

) Logic to +13 volts_ Logic 1 : +16 to +24 volls_ Externa] Contro] Output: (Open co]lector current s ink. ) Minimum Toad impedance: Ma ximum Toad current: 600 ohms 40 mA 1-1

Drawings (1)

Each scan with its trace laid over it: the slider runs from the scan to the vector drawing. Click one to see it large and save it as SVG, DXF, KiCad, PDF or PowerPoint.

490-02-004 · schematic · 1978|11
Added Ceb Engviewer

Read from the drawing title blocks.

Drawing Title Date Drawn by Checked by Iss. Source
490-02-004 Added Ceb Eng file
An archive by Anthony Peter Kuzub · WBSps.Kuzub.com · WBSps.ca
generated from M490C.md