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SECTION 4 MECHANICAL ADJUSTMENTS
1. Clean the following parts with a denatured-alcohol-moistene swab: playback head pinch roller rubber belt capstan idler 2. Demagnetize the playback head with a head demagnetizer. 3. Do not use a magnetized screwdriver for the adjustments. 4. After the adjustments, apply suitable locking compound to the parts adjusted. 5. The adjustments should be performed with the power supply voltage unless otherwise noted. � Torque Measurement
Mode Forward Forward Back Tension Reverse Reverse Back Tension FF, REW Torque Meter CQ-102C CQ-102C CQ-102RC CQ-102RC CQ-201B Meter Reading 30 � 65 g�cm (0.42 � 0.90 oz·inch) 0.5 � 4.5 g�cm (0.01 � 0.06 oz·inch) 30 � 65 g�cm (0.42 � 0.90 oz·inch) 0.5 � 4.5 g�cm (0.01 � 0.06 oz·inch) 60 � 200 g�cm (0.83 � 2.78 oz·inch)
SECTION 5 ELECTRICAL ADJUSTMENTS
TEST MODE This set have the test mode function. In the test mode, FM Auto Scan/Stop Level and AM (MW) Auto Scan/Stop Level adjustments can be performed easier than it in ordinary procedure. <Set the Test Mode> 1. Set the �power select� switch (S501) is �A� position. 2. Turn ON the regulated power supply. (All LEDs on the set lights up, and the clock is displayed) Note: Press the [OFF] button, if the clock is not displayed. 3. Push the preset [4] button. 4. Push the preset [5] button. 5. Press the preset [1] button for more than two seconds. 6. Then the display indicates all lights, the test mode is set. <Release the Test mode> 1. Push the [OFF] button. 2. Return the �power select� switch (S501) to initially set position.
See the adjustment location from on page 16 for the adjustment.
TAPE DECK SECTION
� Tape Tension Measurement
Mode Forward Reverse Tension Meter CQ-403A CQ-403R Meter Reading more than 90 g (more than 3.18 oz) more than 90 g (more than 3.18 oz)
0 dB=0.775 V
Tape Speed Adjustment Setting:
speed checker or frequency counter 10 k �
test tape WS-48A (3 kHz, 0 dB)
set LINE OUT
�
+
Procedure: 1. Put the set into the PB mode. 2. Adjust adjustment resistor for inside capstan motor so that the reading on the speed checker or frequency counter becomes in specification. Specification: Constant speed
Speed checker �1.5 to +2.5% Frequency counter 2,955 to 3,075 Hz
Adjustment Location: See page 16.
MC-Service
� 13 �
 $4.99 XR3750 SONY
Service Manual Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagr…
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