42
14 Measurements and Adjustments
14.1 Cassette Deck Section
Measurement Condition
·
Make sure head, capstan and press roller are clean.
·
Judgeable room temperature 20 ± 5 °C (68 ± 9°F)
Measuring instrument
·
EVM (DC Electronic voltmeter)
·
Digital frequency counter
Test Tape
·
Tape speed gain adjustment (3 kHz, -10 dB);
QZZCWAT
14.1.1 Tape Speed Adjustment (Deck 1/2)
1. Set the tape edit button to “NORMAL” position.
2. Insert the test tape (QZZCWAT) to DECK 2 and
playback (FWD side) the middle portion of it.
3. Adjust Motor VR (DECK 2) for the output value
shown below.
Adjustment target: 2940 ~ 3060 Hz (NORMAL speed)
4. After alignment, assure that the output frequency
of the DECK 1 FWD are within ±60 Hz of the value of the
output frequency of DECK 2 FWD.
Fig.1
14.1.2 Bias and Erase Voltage Check
1. Set the unit “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into
DECK 2 and the unit to “REC” mode (use “• REC/STOP” key).
3. Measure and make sure that the output is within
the standard value.
Bias voltage for Deck 2
14±4mV (Normal)
Erase voltage for Deck 2
80mV (Normal)
Fig.2
Fig.3
14.1.3 Bias Frequency Adjustment (Deck 1/2)
1. Set the unit to “AUX” position.
2. Insert the Normal blank tape (QZZCRA) into
DECK 2 and set the unit to “REC” mode (• use “REC/STOP”
key).
3. Adjust L1002 so that the output frequency is
within the standard value.
Standard Value: 97 ±8 kHz
Fig.4
14.2 Tuner Section
14.2.1 AM-IF Alignment
1. Connect the instrument as shown in Fig.5.
2. Set the unit to AM mode.
3. Apply signal as shown in Fig. 5 from AM-SG.
4. Adjust Z2602 so that the output frequency is
maximized in Fig.
6.
Summary of Contents for SC-TM23
Page 8: ...9 Operation Procedures 8 ...
Page 44: ...44 15 Block Diagram ...
Page 45: ...45 ...
Page 46: ...46 ...
Page 47: ...47 6601 6601 565 ...
Page 48: ...48 ...
Page 49: ...49 565 9 ...
Page 50: ...50 ...
Page 51: ...51 16 Voltage Measurement ...
Page 52: ...52 ...
Page 54: ...17 1 A CD Servo Circuit 54 ...
Page 55: ...55 ...
Page 56: ...56 17 2 B Main Tuner Circuit ...
Page 57: ...57 17 3 B Main Circuit ...
Page 58: ...58 ...
Page 59: ...59 ...
Page 60: ...60 ...
Page 61: ...17 4 C Panel Circuit 61 ...
Page 62: ...62 ...
Page 64: ...64 17 6 H Power Circuit ...
Page 65: ...65 17 7 I Deck Circuit J Mechanism Circuit ...
Page 66: ...66 ...
Page 68: ...68 18 2 B Main P C B ...
Page 69: ...69 ...
Page 70: ...70 18 3 C Panel P C B ...
Page 71: ...71 ...
Page 72: ...72 18 4 D Transformer P C B ...
Page 73: ...73 18 5 E CD Detect P C B F Spindle Position P C B G CD Loading P C B K Tuner Pack P C B ...
Page 74: ...18 6 H Power P C B 74 ...
Page 75: ...75 ...
Page 76: ...18 7 I Deck P C B J Deck Mechanism P C B 76 ...
Page 77: ...77 19 Wiring Connection Diagram ...
Page 78: ...78 20 Illustration of IC s Transistors and Diodes ...
Page 82: ...82 22 Troubleshooting Guide ...
Page 86: ...86 23 1 2 Deck Mechanism Parts List ...
Page 89: ...89 23 2 2 CD Loading Mechanism Parts List ...
Page 123: ...2 Connection of the Speaker Wiring 3 Cabinet Parts Location 123 ...