Servicing Note - Sony TCM-50DV Service Manual

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1-1. SERVICE MODE
Mode to allow the mechanical parts to operate with the main board
open.
This set uses the photo reflector PH701 to detect the rotation of the
idler gear. PH701 is on the main board and so removal of the main
board does not allow the set to detect the rotation of the idler gear.
This makes motor control impossible which prevents normal
operation.
When repairing the set as energized with the main board removed,
proceed as follows:
1. Setting
1) Remove the cabinet (rear) (refer to the Disassembly) and open
the main board.
2) Apply a trapezoidal of 10 to 100 Hz (at 1.3 V) from oscillator to
TP20. (Connect the ground to TP30.)
3) Supply DC 3.0 V to the positive and negative terminals of the
battery with a stabilized power supply.
2. FF mode
1) Apply a trapezoidal to hall sensor TP20.
2) Press the FF key.
3) Turn on the S103 (POWER) switch.
3. REW mode
1) Apply a trapezoidal to hall sensor TP20.
2) Press the REW key.
3) Turn on the S103 (POWER) switch.
4. PLAY mode
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1) Apply a trapezoidal to hall sensor TP20.
2) Press the PLAY key.
3) Change over the S101 (REC/PB) switch to PB side.
4) Turn on the S103 (POWER) switch.
5. REC mode
1) Apply a trapezoidal to hall sensor TP20.
2) Press the REC key.
3) Change over the S101 (REC/PB) switch to REC side.
4) Turn on the S103 (POWER) switch.
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SERVICING NOTE

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SECTION 1
2 9
8
– main board (conductor side) –
– main board (component side) –
Q Q
3 6 7 1 3 1 5
co
.
– 3 –
9 4 2 8
TP20
TP30
0 5 8 2 9 9 4 2 8
S103
(POWER)
S101
PB REC
m
9 9
TP20
TP30
9 9