1-15
RC-BZ5LB/BZ5RD
RC-BZ6BU
1. Low frequency oscillator
(Frequency range: 50Hz to 20kHz)
(Output: 0 dBs across 600 Ω terminating resistor)
2. Attenuator(Impedance: 600 Ω)
3. Test Tapes
VT712 For tape speed, wow & flutter check
VT722, 724 For playback, output level check
VT738 For playback frequency response check
VT702 For head azimuth adjustment
4. Blank tape TYPE1:AC–225
5. Electronic voltmeter
6. Distortion meter
7. Frequency counter
8. Wow and flutter meter
9. Torque gauge(Cassette type) CTG – N
10. Test disc CTS1000
11. Jitter meter NJM631
12. TE Offset LTM9055
Measuring conditions(Amplifier section)
Supply voltage AC120V(60Hz)
DC12V(UM–1 x 8)
Reference output level Speaker
: 0 dBs(0.775V) / 3 Ω
Headphone
: –10 dBs(0.245V) / 32 Ω
Reference input level
: –20 dBs supplied to test point CN1
Standard test frequency 1kHz
Output measuring point Speaker terminal
:Dummy load 3 Ω
Standard position of switches
Function switch TAPE
Beat cut switch NORMAL
Standard position of controls
Tone Maximum position
Main volume adjust 0 dBs output position
Adjustment method
Test Instruments required for adjustment
Test remarks
1. Negative side of the input and output terminals of the
testing set, shall be isolated from each other. The
negative side should not be commonly connected
when a 2channel electronic voltmeter is connected.
2. A dummy load shall be connected to the output
terminal and the lead wires of dummy load shall be
as thick as possible.
Measuring condition(Tuner section)
Power supply voltage to tuner Vcc: DC 6V
Reference output Speaker: 0.245V/3 Ω
AM modulation 400Hz, 30%
FM modulation 400Hz, deviation 22.5kHz
Remarks for alignment
1. Connect 30 pF capacitor and 33k Ω resistor to the
output terminal of the IF sweeper in series while
0.082 µ F capacitor and 100k Ω resistor to the input
terminal in series.
2. Set the output level of the IF sweeper as low as
adjustable.
3. IF alignment is not necessary for both AM and FM
MPX alignment is not necessary either. All IFTs and
MPX coil are non-adjusting type.
www.freeservicemanuals.info
Digitized in Heiloo Netherlands
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