Watch Error Adjustment; Power Supply Block Adjustment - Sony PFM-50C1 Service Manual

2-7. Watch Error Adjustment

1. Select [32k Clock Out] in [General] of the Service
Mode and set it to [On].
2. Connect a frequency counter as shown below and
measure the frequency.
CN1003
VCC 1
CLOCK 2
GND 3
Make the cable as short as possible.
3. Select [Watch Error] in [General] of the Service Mode
and enter the measurement result.
4. Select [32k Clock Out] in [General] of the Service
Mode and set it to [Off].

2-8. Power Supply Block Adjustment

When the power supply block is replaced, perform the
following adjustments.
1. Connect the 100 % all white signal to INPUT1.
2. Connect the positive probe (+) of a digital VOM to
TP1 (Vs) and the ground (_) probe to TP4 (GND).
3. Adjust RV401 (Vs ADJ) so that the VOM reading
becomes the Vs value ± 0.5 V in the top right of the
back of the panel.
4. Connect the positive probe (+) of a digital VOM to
TP2 (Vd).
5. Adjust RV601 (Vd ADJ) so that the VOM reading
becomes the Vd value ± 0.5 V in the top right of the
back of the panel.
2-22
10kΩ
Frequency counter
PFM-50C1/50C1E