Mechanical Adjustments; Electrical Adjustments - Sony TCM-500DV Service Manual

MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback/erase head pinch roller
capstan rubber belt
2. Demagnetize the record/playback/erase head with a head demag
netizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power supply
voltage (3 V) unless otherwise noted.
SECTION 4
Torque Measurement
Mode Torque Meter
FWD
(0.28 – 0.55 oz•inch)
CQ-102C
FWD
Back Tension
0.05 – 0.49 mN•m
REV
REV (0.007 – 0.069 oz•inch)
Back Tension
more than 4.91 mN•m
FF, REW CQ-201B
(more than 50 g•cm)
(more than 0.69 oz•inch)
Tape Tension Measurement
Mode Tension Meter
FWD CQ-403A
(more than 1.76 oz)
Setting:
• Supplied voltage: 3 V (DC)
Meter Reading
• Switch and control position
1.97 – 3.92mN•m
VOL contorl (RV101)
(20 – 40 g•cm)
REC SPEED switch (S401) : normal (4.8cm/s)
PAUSE switch (S601)
SPEED CONTROL (RV201) : center click
VOR switch (S402)
(0.5– 5 g•cm)
Regulation Level
input level Mic
output level earphone
Test Tape
Type Signal
WS-48A 3 kHz, 0 dB
Meter Reading
more than 50 g
0 dB=0.775 V
Adjustment Location:
– MAIN BOARD (Conductor Side) –
7 7
SECTION 5

ELECTRICAL ADJUSTMENTS

Tape Speed Adjustment
Mode: playback
test tape
: mechanical center
WS-48A
(3 kHz, 0 dB)
: OFF
: OFF
Procedure:
–60dBs
1. Set [REC TIME] switch (S401) to NORMAL (4.8 cm/s) posi-
16Ω, –20dBs
tion, and playback the tape (WS-48A) .
2. Adjust RV602 so that frequency counter reading becomes 3,010
Hz.
3. Set [REC TIME] switch (S401) to DOUBLE (2.4 cm/s) posi-
tion.
Used for
4.Playback the tape from the beginning for two minutes, then ad-
tape speed adjustment
just RV601 so that frequency counter reading becomes 1,505 Hz.
Confirm that deflection of the frequency counter reading between
the beginning and the end of tape is within 2% (NORMAL: approx.
60 Hz, DOUBLE: approx. 30 Hz) .
RV601
Tape Speed Adjustment
(Double Speed)
IC601
TCM-500DV
Ver 1.2
frequency
counter
16 Ω
+
set
–
EAR jack (J102)
RV602
Tape Speed Adjustment
(Normal Speed)
20 11
1 10