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What are the initial control settings for test procedures?
Set controls to the following positions for the test procedure:
Input Selector: Aux
Tone Controls: Flat (12 O’clock)
Loudness: Minimum (full CCW)
Balance: 12 O’clock
Speaker #1: On
Deviate from these settings as instructed in the test procedures. Return to these settings at the beginning of each new test. All tests are to be made with 117V AC line. Unless otherwise specified, supply input to both channels and read both outputs.
What should be done if power line voltages other than 120 V.A.C. are used for testing?
When power line voltages other than 120 V.A.C. are used for testing, be sure the voltage selector in the unit is set to the appropriate position and that equivalent test equipment is used.
What is a useful tip when troubleshooting defective power circuits?
When troubleshooting defective power circuits, it is sometimes useful to switch a small line voltage lamp in series with equipment under test before applying power. The lamp will limit the current drawn, thus preventing further damage to circuit components. The variable power line transformer is also useful to determine if additional short circuits exist, if used with a power line current and Volt meter.
How can an FM antenna matching network be assembled if a standard one is not available?
Where a standard FM antenna matching network is not available for the particular signal generator in use, a suitable network can be assembled on a small phenolic, or plastic board, using the circuit described in the PDF. The completed assembly should use short leads for connection to the receiver antenna terminals. Some generator cables may permit the circuit block to be attached directly to the cable terminals.
Note: All resistors are 1/2 Watt, carbon composition, selected on a DVM, or Wheatstone bridge.
What is noted about models R-316L and T-526L regarding AM frequency bands and switches?
Models R-316L and T-526L are designed to tune two AM frequency bands. See tuning ranges listed on page 2 of the PDF.
In model R-316L, band switches replace FILTER AM and FILTER MPX.
In model T-526L, band switches replace DIM switch and DE-EMP switch.
How is the NPN output transistor (Q807 & Q817) resistance checked?
Test: NPN Output transistor Q807 & Q817
Input: None, Unit “OFF”
Control Settings: Not applicable
Test Equipment: Triplett 630A
Scale Settings: Ohms X 1000
Measure At – Positive Probe: + Filter cap
Measure At – Negative Probe: P809 P806
Readings: 9K
Tolerance: ±1K
How is the NPN output transistor (Q810 & Q820) resistance checked?
Test: NPN Output transistor Q810 & Q820
Input: None, Unit “OFF”
Control Settings: Not applicable
Test Equipment: Triplett 630A
Scale Settings: Ohms X 1000
Measure At – Positive Probe: P809 P806
Measure At – Negative Probe: Filter cap
Readings: 700 ohms
Tolerance: ±1K, +200 ohms
How is the B+ Supply checked?
Test: B+ Supply
Input: None, Unit “ON”
Control Settings: Volume “Minimum”, Selector “FM”
Test Equipment: Triplett 630A
Scale Settings: Volts
Measure At – Positive Probe: + Filter cap
Measure At – Negative Probe: Chassis
Readings: R316 – 26V, R326 – 32V, T526 – 24V
Tolerance: ±15%
How is the B- Supply checked?
Test: B- Supply
Input: None, Unit “ON”
Control Settings: Volume “Minimum”, Selector “FM”
Test Equipment: Triplett 630A
Scale Settings: Volts 60 DC
Measure At – Positive Probe: Chassis
Measure At – Negative Probe: Filter cap
Readings: R316 – 26V, R326 – 32V
Tolerance: ±15%
How is the Regulated B+ Voltage checked?
Test: Regulated B+ Voltage
Input: None, Unit “ON”
Control Settings: Volume “Minimum”, Selector “FM”
Test Equipment: Triplett 630A
Scale Settings: Volts 60 DC
Measure At – Positive Probe: P901 Regulator/Supply Board
Measure At – Negative Probe: Chassis
Readings: +13V DC
Tolerance: ±10%
How is the Output Offset Voltage checked?
Test: Output Offset Voltage
Input: None, Unit “ON”
Control Settings: Volume “Minimum”, Selector “Aux”
Test Equipment: DC Millivoltmeter
Scale Settings: 100mV
Measure At – Positive Probe: Speaker #A “L”
Measure At – Negative Probe: Speaker #A “G”
Readings: +100mV max.
Tolerance: Max.
How is the Bias Check performed?
Test: Bias Check
Input: None, Unit “ON”
Control Settings: None, if necessary, adj. padding resistor across R808 L. Ch. R830 R. Ch.
Test Equipment: Triplett 630A
Scale Settings: 12mA DC only
Measure At – Positive Probe: “E” of Q807, “E” of Q817
Measure At – Negative Probe: “C” of Q810, “C” of Q820
Readings: Adjust pad for 0.2mA DC nominal. Unit temperature approx. 100°F, 42°C
Tolerance: +100% -0
How is the Speaker A Audio Level tested for R-316 and R-326?
Test: Speaker A Audio Level 8 ohm
Input: 1000 Hz Aux.
Control Settings: Selector “Aux.”, Mono Switch “In”, Volume “Maximum”
Test Equipment: AC VTVM, Scope
Scale Settings: AC VTVM: 30V, Scope: 10V/DIV
Measure At – Positive Probe: Speaker A “L” (8 ohm load high)
Measure At – Negative Probe: Speaker A “G” (8 ohm load low)
Readings: Adjust input signal for output of: R-316 – 12.7V, R-326 – 15.5V (No Clipping permitted)
Tolerance: +1 dB, -0 dB
How are Tape 1 and Tape 2 Inputs tested?
Test: Tape 1 Inputs / Tape 2 Inputs
Input: Tape 1 in 1000 Hz / Tape 2 in 1000 Hz
Control Settings: Tape Monitor Switch “Monitor” (Volume Maximum)
Test Equipment: AC VTVM
Scale Settings: 30V
Measure At – Positive Probe: Speaker A “L” (8 ohm load high)
Measure At – Negative Probe: Speaker A “G” (8 ohm load low)
Readings: Same as Speaker A Audio Level test (Adjust input signal for output of: R-316 – 12.7V, R-326 – 15.5V (No Clipping permitted))
How is the Tape Monitor Output tested?
Test: Tape Monitor Output
Input: Aux.
Control Settings: Selector “Aux.”, Volume “Minimum”
Test Equipment: AC VTVM
Scale Settings: 1V
Measure At – Positive Probe: Tape Out
Measure At – Negative Probe: Ground
Readings: Output of 0.15V with input of 0.15V
How is the Audio Level for Speaker B (8 ohm) tested for R-316 and R-326?
Test: Audio Level 8 ohm (Speaker B)
Input: Aux. 1000 Hz
Control Settings: Selector “Aux.”, Mono Switch “Mono”, Volume “Maximum”, Spkr. B. On
Test Equipment: AC VTVM
Scale Settings: 30V
Measure At – Positive Probe: Speaker B “L” (8 ohm load high)
Measure At – Negative Probe: Speaker B “G” (8 ohm load low)
Readings: Adjust input signal for output of: R-316 – 12.7V, R-326 – 15.5V (No Clipping permitted)
How are Speakers A & B output checked?
Test: Check Spkr. A & B
Input: Same as Audio Level 8 ohm test (Aux. 1000 Hz)
Control Settings: As above except Spkr. A & B on
Test Equipment: AC VTVM
Scale Settings: 30V
Measure At – Positive Probe: Speakers A & B “L” & “R” (8 ohm load high)
Measure At – Negative Probe: Speakers A & B “G” (8 ohm load low)
Readings: Output check only, check at low level
How is the Frequency Response of the Power Amp & Tone Control tested?
Test: Frequency Response Power Amp & Tone Control
Input: Aux.
Control Settings: Tone Control “Flat”, Volume “Maximum”, Adjust balance for center
Test Equipment: AC VTVM
Scale Settings: 1V
Measure At – Positive Probe: Speaker A “L” (8 ohm load high)
Measure At – Negative Probe: Speaker A “G” (8 ohm load low)
Readings: Adjust input for 0 dB (.775V) output (3 dB down points should be below 10 Hz and above 30 kHz)
Tolerance: ±1dB
How is the Phono (RIAA) Frequency Response tested?
Test: Frequency Response Phono (RIAA)
Input: Phono 1000 Hz
Control Settings: Selector “Phono”
Test Equipment: AC VTVM
Scale Settings: 1V
Measure At – Positive Probe: Speaker A “L” (8 ohm load high)
Measure At – Negative Probe: Speaker A “G” (8 ohm load low)
Readings: Adjust input for 0 dB (.775V) output. Note: 100 Hz +12.5 dB, 10 kHz -13.0 dB
Tolerance: ±1.5 dB
How is the Tone Control Response tested?
Test: Tone Control Response
Input: Aux. 1000 Hz
Control Settings: Selector “Aux.”, Mode Switch “Mono”, Tone Control “Flat”
Test Equipment: AC VTVM
Scale Settings: 3V
Measure At – Positive Probe: Speaker A “L” (8 ohm load high)
Measure At – Negative Probe: Speaker A “G” (8 ohm load low)
Readings: Adjust input for 0 dB (.775V) output. Note: @ 100 Hz Bass boost +10 dB, Bass cut -10 dB. @ 10 kHz Treble boost +10 dB, Treble cut -10 dB
Tolerance: ±1.5 dB (Bass), ±1.5 dB (Treble)
How is Loudness Compensation tested?
Test: Loudness Compensation
Input: Aux. 1000 Hz
Control Settings: Selector “Aux.”, Tone Control “Flat”, Volume “11 O’clock”, Loudness Sw. “on”
Test Equipment: AC VTVM
Scale Settings: 3V
Measure At – Positive Probe: Speaker A “L” (8 ohm load high)
Measure At – Negative Probe: Speaker A “G” (8 ohm load low)
Readings: Adjust input for 0 dB. Frequency, to 10 kHz; Note 3 dB increase. Frequency to 100 Hz; Note 7 dB increase.
Tolerance: ±1 dB
How is Crosstalk tested?
Test: Crosstalk
Input: Aux. Left Channel 10 kHz
Control Settings: Selector “Aux.”, Tone Control “Flat”, Comp. Sw. “Off”, Volume “Maximum”, Mode Switch “Stereo”
Test Equipment: AC VTVM
Scale Settings: 3V
Measure At – Positive Probe: Speaker A “L” (8 ohm load high)
Measure At – Negative Probe: Speaker A “G” (8 ohm load low)
Readings: Set output for 0 dB. Read right channel output 35 dB down.
Tolerance: Min.
How is the Balance Control tested?
Test: Balance Control
Input: Aux. Left Channel 1000 Hz
Control Settings: Selector “Aux.”, Tone Control “Flat”, Comp. Sw. “Off”, Volume “Maximum”, Mode Switch “Mono”. First test with Balance CCW, then with Balance CW.
Test Equipment: AC VTVM
Scale Settings: 3V
Measure At – Positive Probe: Speaker A “L” (8 ohm load high)
Measure At – Negative Probe: Speaker A “G” (8 ohm load low)
Readings: With Balance CCW: Set output for 0 dB. Note 45 dB drop in output, right chan. With Balance CW: Note 45 dB drop in output, left chan.
Tolerance: ±2 dB
How is Harmonic Distortion tested for R-316 and R-326?
Test: Harmonic Distortion
Input: Aux. 20 Hz, 1000 Hz, 20,000 Hz (*R316 & R326 – 40 Hz)
Control Settings: Selector “Aux.”, Mode Switch “Mono”, Balance “Center”, Volume “Maximum”
Test Equipment: AC VTVM, Harmonic Distortion Analyzer
Scale Settings: 30V
Measure At – Positive Probe: Speaker A “L” (8 ohm load high)
Measure At – Negative Probe: Speaker A “G” (8 ohm load low)
Readings: Adjust input for output @ both chan. R316 – 12.7V, R326 – 15.5V
Tolerance: 0.5%
Note: Power line Voltage 120 VAC ≤2.0% line THD. When transformer primary is connected for other than 120 Volts, use appropriate supply voltage.
How is the Damping Factor tested?
Test: Damping Factor
Input: Aux. 1000 Hz
Control Settings: Selector “Aux.”, Mode Switch “Mono”, Balance “Center”, Volume “Maximum”
Test Equipment: AC VTVM
Scale Settings: 3.0V
Measure At – Positive Probe: Speaker A “L” (8 ohm load high)
Measure At – Negative Probe: Speaker A “G” (8 ohm load low)
Readings: Set output to 2.45V (+10 dB). Remove load and note increase in level. Max. 0.5 dB.
What is the AM MW test procedure?
| STEP | ANTENNA | SIGNAL GENERATOR COUPLING | SIGNAL GENERATOR FREQUENCY | INPUT SELECTOR SWITCH | DIAL SETTING | TEST INSTRUMENTS | ADJUST | REMARKS |
|---|---|---|---|---|---|---|---|---|
| 1. | Connect external antenna terminal thru 220 pF dummy antenna | External antenna terminal. Keep signal level low. | 455 kHz 60% mod. 400 Hz | AM MW | Approx. 600 kHz (No sta.) | Scope, VTVM @ Tape Output | I.F. coils T207, T208 | Adjust for maximum signal output |
| 2. | Same as above | Same as above | 600 kHz | Same | 600 kHz | Same | AM MW Osc. T203 | Adjust for calibration |
| 3. | Same as above | Same as above | 1400 kHz | Same | 1400 kHz | Same | AM MW Osc. Trimmer AM1 (F.E. ass’y) | Adjust for calibration |
| 4. | Same as above | Same as above | 1400 kHz | Same | 1400 kHz | Same | MW R.F. Trimmers AM2, AM3 (F.E. ass’y) | Adjust for maximum signal |
| 5. | Same as above | Same as above | 600 kHz | Same | 600 kHz | Same | MW Antenna slider under bracket (See figure in PDF) | Adjust for maximum signal (soften wax, then reseal) |
| 6. | Repeat steps 2, 3, 4, 5 for maximum. | |||||||
| 7. | Same as Step 1 | 300µV | 1400 kHz 60% mod. | AM MW | 1400 kHz | VTVM & Distortion Analyzer | Detector T209 | Adjust for maximum undistorted output (1% or less). Output should fall between 600 and 800 mV. |
| 8. | Whistle Filter Alignment: Connect output of audio oscillator to junction of R215 & C225. Set oscillator frequency to 1.0 kHz, adjust audio oscillator output for 1.0 Volt at tape output. Change oscillator frequency to 9.5 kHz and adjust T210 for minimum output. | |||||||
What is the AM LW test procedure?
| STEP | ANTENNA | SIGNAL GENERATOR COUPLING | SIGNAL GENERATOR FREQUENCY | INPUT SELECTOR SWITCH | DIAL SETTING | TEST INSTRUMENTS | ADJUST | REMARKS |
|---|---|---|---|---|---|---|---|---|
| 9. | Same as Step 1 (AM MW Test) | Same as Step 1 (AM MW Test) | 150 kHz | AM LW | 150 kHz | Same as Step 1 (AM MW Test) | AM LW Osc. T204 | Adjust for calibration |
| 10. | Same as above | Same as above | 350 kHz | Same | 350 kHz | Same | AM LW Osc. Trimmer C236 | Adjust for calibration |
| 11. | Same as above | Same as above | 350 kHz | Same | 350 kHz | Same | LW R.F. Trimmers C235, C237 | Adjust for maximum signal |
| 12. | Same as above | Same as above | 150 kHz | Same | 150 kHz | Same | LW Antenna slider under bracket (See figure in PDF) | Adjust for maximum signal (soften wax, then reseal) |
| 13. | Repeat steps 9, 10, 11, 12 for maximum. | |||||||
| 14. | Same as Step 1 (AM MW Test) | Same as Step 1 (AM MW Test) | 455 kHz | AM LW | Approx. 350 kHz (No sta.) | Scope, probe at IC PIN 1 (uA 720) | 455 kHz trap T206 | Tune for Null |
NOTE: AM IF is aligned at the factory using sweep generator. Do not disturb coil adjustment unless replacement coils are installed. Align new coil using 5 kHz generator modulation. Adjust for maximum audio output.
What is the FM test procedure?
| STEP | ANTENNA | SIGNAL GENERATOR COUPLING | SIGNAL GENERATOR FREQUENCY | INPUT SELECTOR SWITCH | DIAL SETTING | OUTPUT METER | ADJUST | REMARKS |
|---|---|---|---|---|---|---|---|---|
| 1. | Dummy antenna Figure FM-1 | External 300 ohm term. Use low signal level | 10.7 MHz 100% mod. | FM | Off Station | VTVM @ Tape Output | Front End IF | Adjust for maximum signal strength meter indication |
| 2. | Same as above | Same as above | 90 MHz 1 kHz Modulation. Keep generator output low. | Same | 90 MHz | Same | Front End LO | Adjust for dial calibration |
| 3. | Same as above | Same as above | Same | Same | Same | Same | Front End LA, LR1, LR2 | Adjust for maximum audio output. Keep signal level low. |
| 4. | Same as above | No output. Same as above (antenna) | Same | Same | Off Station Use noise only | Same | Detector T102 | Use center tune meter (R326). R316 use DC VTVM connected, negative to ground, positive to P106. Adjust for zero DC Volts. |
| 5. | Same as above | External 300 ohm term. Use low signal level | 90 MHz | FM | 90 MHz | VTVM @ Tape Output | T101 | Adjust for maximum output and minimum distortion |
| 6. | Same as above | Same as above | 106 MHz Keep Generator output low | Same | 106 MHz | Same | TCO | Adjust for dial calibration |
| 7. | Same as above | Same as above | 106 MHz | Same | 106 MHz | Same | TCA, TCR1 and TCR2 | Adjust for maximum audio output, keep input level low for noisy signal |
| 8. | Repeat steps 2, 3, 6 and 7 until no further improvement is noted. Check specification. | |||||||
What is the Multiplex test procedure?
Use 19 kHz output of MX generator to trigger oscilloscope horizontal.
| STEP | ANTENNA | SIGNAL GENERATOR COUPLING | SIGNAL GENERATOR FREQUENCY | INPUT SELECTOR SWITCH | DIAL SETTING | OUTPUT METER | ADJUST | REMARKS |
|---|---|---|---|---|---|---|---|---|
| 1. | Dummy antenna Figure FM-1 | External 300 ohm term. | Use convenient freq. | FM | Tune to Gen. | VTVM @ Tape Output | R143 for stationary waveform | Generator output to zero. Scope Vertical to P116. Muting on (19 kHz Osc. adj.) |
| 2. | Same as above | Same as above | Same | FM Stereo | Same | Same | Generator output 1.0mV. Note waveform is synchronized | |
| 3. | Same as above | Same as above | Same | Same | Same | Same | R132 | Adjust for maximum separation |
| 4. | Note: Multiplex filter coils L101, L102, L103 and L104 are pre-aligned. Do not adjust unless circuit component is replaced. If necessary, adjust for null at specified frequency. | |||||||
DEEMPHASIS: With output level reference at 400 Hz, switch modulation frequency to 10 kHz. Output level as follows: ±1 dB
75 µS: 13.7 dB
50 µS: 9.5 dB
25 µS: 4.5 dB
How do you string the dial cord for Receivers (e.g., R-316, R-316L, R-326)?
1. Set tuning capacitor plates “out” (minimum capacitance).
2. Tie dial cord to pulley boss “A”.
3. Wind one turn of dial cord around tuning drum counter-clockwise, as viewed from rear of unit.
4. Continue over pulleys “B”, “C”, “D”, “E”, “F” & “G”.
5. Wind three turns of dial cord around flywheel capstan counter-clockwise, when viewed from rear of unit.
6. Continue to tuning drum and install 1 3/4 turns of dial cord around drum, counter-clockwise. Enter drum opening at point “H” and attach cord to tension spring as shown.
7. Attach dial cord to pointer assembly, rotate dial knob to fully “mesh” tuning capacitor plates (low frequency end of dial).
8. Position pointer assembly on “0” log.
9. Rotate tuning knob in both directions to check for satisfactory dial drive operation, adjust tension as necessary. Apply suitable cement to dial cord knots and at dial pointer clips.
How do you string the dial cord for the T-526 Tuner?
1. Set tuning capacitor plates “out” (minimum capacitance).
2. Tie dial cord to pulley boss “A”.
3. Install cord around pulleys “B”, “C”, “D”, “E” & “F”.
4. Wind dial cord around flywheel capstan (G) three turns in a counter-clockwise direction.
5. Continue over pulleys “H” and “J”. Use care not to bend tuning capacitor plates.
6. Wind two turns of dial cord around tuning drum (clockwise) and tie to dial cord tension spring at point “K”.
7. Turn tuning knob counter-clockwise to “mesh” tuning capacitor plates.
8. Set dial pointer to “0” log and attach dial cord to pointer.
9. Check for free operating dial drive with adequate cord tension.
10. Apply suitable cement to knots at each end of dial cord, and to cord where it is clipped to the pointer assembly.
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