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Sharp PC-1360 Capacitor Replacement Guide

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Sharp PC-1360 main board capacitors (service manual)
The 3.3 µF capacitor (left) and the three 1 µF capacitors on the PC-1360 main board; the arrows show the fitting direction (Sharp service manual).

Capacitors in the Sharp PC-1360. Sharp's parts list for the main board has two polarised capacitor types, 1 µF and 3.3 µF 10 V, and the board drawing shows one 3.3 µF capacitor and three 1 µF capacitors beside the contrast control and the LCD divider resistors.[1][2] The drawing gives no designators. The rest of the capacitors are ceramics.

The board drawing carries three notes that matter when replacing them: the parts must be fitted in the direction of the arrows, the CSB768DMT resonator must be fitted within a marked area, and the 1 µF and 3.3 µF capacitors must be fitted within the board.[3]

Check the cells and their terminals before anything else; see Sharp PC-1360 General Maintenance and Battery Explosion, Capacitor or Corrosion Damage.

PC-1360 capacitor list

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PC-1360 main board polarised capacitors (Sharp service manual)
Qty on drawing Value Rating Sharp part code Position
1 3.3 µF 10 V RC-SZ1021CCZZ Top left of the main board, near the contrast control[2][1]
3 1 µF Not stated RC-SZ1007CCZZ In a row along the top edge, beside the 30 kΩ and 10 kΩ divider resistors[2][1]

The PC-1360 parts list gives no voltage for the 1 µF part; the same Sharp code, RC-SZ1007CCZZ, is listed as 1 µF 6.3 V in the PC-1250/1251 service manual.[4] The PC-1350, whose main board has the same arrangement of one 3.3 µF and three 1 µF capacitors, has them as C1 to C4 on its circuit diagram; see Sharp PC-1350 Capacitor Replacement Guide.[5] Sharp's manuals do not say whether the RC-SZ parts are tantalum or aluminium.

Other capacitors in the PC-1360 main board parts list[1]
Sharp part code Description
RC-CZ1021CCZZ 0.1 µF
RC-CZ1035CCZZ 100 pF
RC-CZ1037CCZZ 0.01 µF

Signs of trouble

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  • Corrosion or residue round the 3.3 µF capacitor or the 1 µF row.
  • A faint or uneven display that the contrast control does not correct with fresh cells.
  • Current above Sharp's limits: 25 µA with the power off, 600 µA while displaying.[6]

Replacement

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  1. Copy or save the RAM card contents, then remove the cards and the cells.
  2. Use an anti-static strap.
  3. Note the polarity and the fitting direction of each part before removing it.[2][3]
  4. Remove each part with two irons or hot tweezers and clean the pads.
  5. Fit 3.3 µF rated 10 V or more and 1 µF rated at least 6.3 V, in the same package size, keeping each part within the board outline as Sharp requires.[3]
  6. Refit the cells and a card and run the built-in display test; see Sharp PC-1360 Troubleshooting Guide.

Checks after replacement

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After the work (Sharp service manual)[6][7]
Check Expected
Current, power off 25 µA maximum
Current, displaying 600 µA maximum
Test program 1 (display) Test patterns shown correctly
Contrast control A clear display can be set
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References

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  1. ↑ 1.0 1.1 1.2 1.3 Sharp, Service Manual, Model PC-1360, section 13 "Parts list & guide", main PWB unit (PDF page 18): RC-SZ1007CCZZ capacitor 1 µF; RC-SZ1021CCZZ capacitor 10 WV 3.3 µF; RC-CZ1021CCZZ, RC-CZ1035CCZZ, RC-CZ1037CCZZ.
  2. ↑ 2.0 2.1 2.2 2.3 Sharp, Service Manual, Model PC-1360, section 12 "Parts and signals position", printed page 12 (PDF page 12).
  3. ↑ 3.0 3.1 3.2 Sharp, Service Manual, Model PC-1360, section 12, notes 1 to 3, printed page 13 (PDF page 13).
  4. ↑ Sharp Corporation, Service Manual, Model PC-1251, PC-1250, December 1982, parts list (PDF page 18). Hosted as File:Sharp PC-1251 Service Manual.pdf.
  5. ↑ Sharp Corporation, Service Manual, PC-1350, September 1984, circuit diagram (1) and main board layout chart (PDF pages 13 and 17). Hosted as File:Sharp PC-1350 Service Manual.pdf.
  6. ↑ 6.0 6.1 Sharp Corporation, Service Manual, Model PC-1360, code 00ZPC1360SM/E, August 1986, section 6 "Power consumption", printed page 3 (PDF page 3). Hosted as File:Sharp PC-1360 Service Manual.pdf.
  7. ↑ Sharp, Service Manual, Model PC-1360, section 9 "Test program", printed pages 7 to 8 (PDF pages 7 to 8).


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