Mechanical Adjustments; S2, T2 And F Guide Adjustments; Fwd Back Tension Adjustment; Rev Torque Check And Rev Back Tension Check - Sony PCM-R500 Service Manual

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3-1. MECHANICAL ADJUSTMENTS

When replacing any drum related parts, after S2, T2 and F guide
adjustments have been made, tape pass fine adjustment (×1.5FWD
mode) in Electrical adjustment should be performed.

S2, T2 and F Guide Adjustments

Adjustment Method:
1. Enter the Test Mode 1 (see page 19.) and set the test tape TY-
7252 (8-909-822-00).
2. Set the REC MODE switch to STANDARD 48k and press the
AMS + key.
While in FWD mode, check that there is no curl on the upper
and lower flanges of the S2, T2 and F guides.
If any curl is present, put the S2, T2 and F guide of concern
back in the high position and adjust by adjusting the direction
of tightening.
* What is curl?
Curl
3-2. ELECTRICAL ADJUSTMENTS
End Sensor Adjustment
When removing the holder assy and when replacing the mechanism
deck block, this adjustment should be performed.
Adjustment Method:
TE
1. Connect the CH-1 terminal of an oscilloscope to TP (S-END)
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and the CH-2 terminal to TP (T-END) on the DIGITAL board.
2. Enter the Test Mode 1 (see page 19.) and set the end sensor
cassette tape (see page 19.)
3. Set the STOP (p) mode.
4. Adjust RV502 (S-END) and RV501 (T-END) on the DIGITAL
board so that the respective peak to peak values of the wave-
forms on the oscilloscope are 1.2 Vp-p.
Adjustment Location: See page 23.
FWD Torque Adjustment
Adjustment Method:
1. Enter the Test Mode 2 (Torque Measurement Mode) (see page
19.) and set the torque meter TW-7131 (8-909-708-71).
2. Press the PLAY (") key.
3. Press the ) key or 0 key and adjust so that the FWD torque
value (T side take-up torque) is within the range of 11 to 13
g•cm.
4. When the torque meter is circulating around, check the indi-
cated value.
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FWD Back Tension Adjustment

Adjustment Method:
1. Enter the Test Mode 2 (Torque Measurement Mode) (see page
19.) and set the torque meter TW-7131 (8-909-708-71).
2. Press the PLAY (") key.
3. Press the AMS + key or = key and adjust so that the back
tension (S side) is within the range of 8.5 ± 0.5 g•cm.
4. When the torque meter is circulating around, check the indi-
cated value.
5. Verify that the maximum value is less than 19.5 g•cm.

REV Torque Check and REV Back Tension Check

Check Method:
1. After FWD torque adjustment and FWD back tension adjust-
ment are completed, press the PLAY (") key again and set REV
(") mode.
2. Check that the REV torque value is within the range of 13.5 to
17.5 g•cm and that the REV back tension value is within the
range of 7.5 to 11.5 g•cm.
Tape Pass Fine Adjustment (×1.5FWD Mode)
When replacing any drum related parts, be sure to perform this ad-
justment.
Adjustment Method:
1. Connect the CH-1 terminal of an oscilloscope to TP (RF) and
the CH-2 terminal to TP (SWP) on the DIGITAL board.
2. Enter the Test Mode 1 (see page 19.) and set the test tape TY-
Q Q
3 6 7 7252 (8-909-822-00). 1 3 1 5
3. Press the AMS (+) key.
Role of each switch in test mode.
OFFSET
– 0
WIRED OFF WIRELESS
REMOTE
4. Put the REC MODE switch to the LONG (ATF: OFF) position
and put the REMOTE switch to either the WIRED or WIRE-
LESS position (OFFSET: – or +), fine adjust both the S1 guide
and T1 guide so that the RF signal waveform of the oscillo-
scope repeatedly contracts and expands in vertical directions as
it has the same shape.
* Adjust the direction of tightening to complete this adjustment.
If there is curl on any of the upper and lower flanges of the
S2, T2 and F guides, adjust the guide of concern.
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.
– 21 –
9 4 2 8
0 5 8 2 9 9 4 2 8
+
ATF : ON
STANDARD
48k
REC MODE
m
9 9
9 9
ATF : OFF
LONG
44.1k