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(1) Tape Speed Adjustment
Caution
This adjustment can be made only in the (4) Motor Speed Adjustment mode under Factory mode.
1. Set the mode to the "Motor Speed Adjustment Mode" under Factory Mode. (Refer to page 20.)
2. Play back the ACC Test Tape (SBC420: 3150H2, -10d8) forward.
3. Adjust RU51 until the frequency counter reads 3150H2.
Adiustment Ta
: 3150 t1 SHz
Preparation
Setup
Test tape and tool required
Measuri ng instruments required
1
ACC test tape (SBC420)
Ceramic screwdriver
(HOZAN D-281 ,@)No. 1.7)
2
1. Frequency counter
Frequency
counter
Connect either L-ch or R-ch.
4. Reverse the direction of tape transport and perform the same check.
Gheck Target: 3150 t30Hz
Note: Four digit number (hexa value) displayed on the LCD is a voltage value of RU51 A/D-converted by the
microcomputer.
(2) Playback Sensitivity Gheck
Preparation
Setup
Test tape and tool required
Measuring instruments required
1. ACC test tape (SBC420)
1. Oscilloscope
2. Electronic voltmeter (EVM)
(AC range)
Lch: OUT (LINE OUT)
Rch: OUT (LINE OUT)
DCCl70
Check Procedure
1. Play back the ACC Test Tape (SBC420:315H2,0d8) fonrvard.
2. Check that the line output levels on both channels fall within the Íollowing limits:
Check Taroet: 450mV tldB
3. Reverse the direction of tape transport and perÍorm the same check.
o lf it is still outside the limits after realignment, do the Playback Sensitivity Adjustment described in item (3).
(3) Playback Sensitivity Adjustment
Preparation
Setup
Test tape and tool required
Measuring instruments required
1. ACC test tape (SBC420)
2. Ceramic screwdriver
(HOZAN D-281 ,@No. 1.7)
1. Oscilloscope
2. Electronic voltmeter (EVM)
(AC range)
Lch: TPl
EVM
Rch: Tp2
(AC range) Osciiloscope
Adjustment Procedure
1. Play back the ACC Test Tape (SBC420: 315H2, OdB) forward.
2. Adjust R127 (L ch) and R128 (R ch) untilthe test land TP1 (Lch) and TP2 (R ch) levels on both channels
Íallwithin the following limits:
Adiustment Tarqet: 113mV tl dB
3. Reverse the direction of 'tape transport and perform the same check.
- 17 -
PCS 79 279
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